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WO2020088764A1 - Procédé servant à fabriquer un produit plat en acier à grains orientés pour des utilisations électromagnétiques, produit plat en acier pour des utilisations électromagnétiques, et empilement de transformateurs-noyaux fabriqué à partir d'un produit plat en acier de ce type - Google Patents

Procédé servant à fabriquer un produit plat en acier à grains orientés pour des utilisations électromagnétiques, produit plat en acier pour des utilisations électromagnétiques, et empilement de transformateurs-noyaux fabriqué à partir d'un produit plat en acier de ce type Download PDF

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Publication number
WO2020088764A1
WO2020088764A1 PCT/EP2018/079898 EP2018079898W WO2020088764A1 WO 2020088764 A1 WO2020088764 A1 WO 2020088764A1 EP 2018079898 W EP2018079898 W EP 2018079898W WO 2020088764 A1 WO2020088764 A1 WO 2020088764A1
Authority
WO
WIPO (PCT)
Prior art keywords
lacquer
layer
flat steel
steel product
paint
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2018/079898
Other languages
German (de)
English (en)
Inventor
Holger Endres
Carsten Schepers
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Henkel AG and Co KGaA
ThyssenKrupp AG
ThyssenKrupp Electrical Steel GmbH
Original Assignee
Henkel AG and Co KGaA
ThyssenKrupp AG
ThyssenKrupp Electrical Steel GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Henkel AG and Co KGaA, ThyssenKrupp AG, ThyssenKrupp Electrical Steel GmbH filed Critical Henkel AG and Co KGaA
Priority to PCT/EP2018/079898 priority Critical patent/WO2020088764A1/fr
Publication of WO2020088764A1 publication Critical patent/WO2020088764A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
    • C23C22/74—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process for obtaining burned-in conversion coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/16—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets
    • H01F1/18—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets with insulating coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2202/00—Metallic substrate
    • B05D2202/10—Metallic substrate based on Fe
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2252/00—Sheets
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/24—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing hexavalent chromium compounds
    • C23C22/33—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing hexavalent chromium compounds containing also phosphates
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/82—After-treatment
    • C23C22/83—Chemical after-treatment

Definitions

  • the invention relates to a method for producing a grain-oriented flat steel product for electromagnetic applications.
  • the invention relates to a flat steel product for electro-magnetic applications, which is particularly suitable as a base for the production of sheet metal stacks, and a transformer core stack, which is formed from blanks of such a flat electrical steel product.
  • Grain-oriented flat steel products of the type in question here which are also referred to in the technical language and in the present text as "electrical sheets” or “electrical steel flat products”, are particularly suitable for uses in which a particularly low magnetic loss is in the foreground and high demands permeability or
  • a steel is first of all made (in% by weight) typically 2.5 to 4.0% Si, 0.010 to 0.100% C, up to 0.150% Mn, up to 0.065% AI and up to 0.0150% N as well as optionally 0.010 to 0.3% Cu, up to 0.060% S, up to 0.100% P, up to 0.2% As, Sn, Sb, Te and Bi, balance iron and unavoidable impurities, to a starting material such as a slab, thin slab or
  • the preliminary material is then subjected to an annealing treatment, if necessary, in order then to be hot-rolled to a hot strip.
  • Descaling or pickling treatment is then cold rolled from the hot strip in one step or several steps, and in the event that several cold rolling steps are carried out, between the
  • An intermediate annealing can be carried out if necessary in the cold rolling steps. During the decarburization annealing carried out subsequently
  • the carbon content of the cold strip is significantly reduced.
  • an annealing separator which is typically MgO, is applied to the strip surfaces.
  • Annealing separator prevents the turns of a coil wound from the cold strip from welding together during the subsequent high-temperature annealing.
  • high-temperature annealing which is typically carried out in a hood furnace under protective gas, a selective texture is created in the cold strip by selective grain growth. Furthermore, a forsterite layer forms on the band surfaces, the
  • Diffusion processes taking place at high temperature annealing cleaned the steel material. Following the high-temperature annealing, the flat electrical steel product obtained is coated with an insulation layer, thermally straightened and stress-relieved in a final “final annealing”. This final annealing can take place before or after the assembly of the in the
  • Electrical steel flat products manufactured in this way are typically 0.15 mm to 0.5 mm thick.
  • the metallurgical properties of the material, the degrees of deformation of the cold rolling processes set during the production of the flat electrical steel products and the parameters of the heat treatment steps are each coordinated so that targeted recrystallization processes take place.
  • Insulation layer can help to minimize the magnetic loss of grain-oriented electrical steel flat products.
  • the insulation layer can transfer considerable tensile stresses to the base material in the burned-in state, which, as described for example in EP 2 022 874 A1, can be up to 0.8 kg / mm 2 , which corresponds to tensile stresses of up to approximately 8 MPa.
  • the tensile stresses transmitted by the insulation coating not only improve the magnetic loss values of the respective flat electrical steel product, but also reduce the magnetostriction, which in turn has a positive effect on the noise behavior of a transformer manufactured using such flat electrical steel product.
  • the main components of the insulation solution used according to DE 22 47 269 C3 to produce the insulation layer are aluminum phosphate and silicon dioxide, the latter also being able to be added in colloidal form. Another component of insulation coatings is common
  • Chromic acid anhydride chromium trioxide
  • chromic acid the content of this constituent, which is questionable with regard to its effects on the environment, being able to be minimized if the other ingredients of the insulation solution are selected appropriately (DE 10 2008 008 781 A1, EP 2 022 874 A1).
  • insulation layers are first applied to the surface of the flat electrical steel product to be coated, which may already have been coated with a glass film, then the thickness of the insulation layer is adjusted, for example with the aid of squeezing rollers, and finally the insulation layer is baked in an oven .
  • the baking temperature is typically approx. 850 ° C.
  • the operation of transformers which are based on transformer cores made from such insulation-coated flat electrical steel products, results in significantly reduced numbers
  • composition of the steel base material of the electrical steel flat product depending.
  • this leads to variations in the coating in color and surface roughness of the insulation layer on the flat electrical steel product.
  • a grain-oriented flat steel product for electromagnetic applications should be specified, the surface quality of which varies within a narrow tolerance window, so that, from blanks of such an flat electrical steel product, stacks which are particularly suitable for the production of transformer-core stacks can be automatically and automatically formed are.
  • the invention has achieved this object in that at least the work steps specified in claim 1 are carried out in the production of a grain-oriented flat steel product. It goes without saying that the process steps which are not mentioned here and which are usually carried out for the person skilled in the art in the production of flat steel products of the type in question here are also additionally carried out in the process according to the invention if there is a need for this.
  • a grain-oriented flat steel product according to the invention can be produced by a method according to the invention and is suitable
  • transformer core sheet metal stacks which are formed by stacking blanks of a flat electrical steel product according to the invention.
  • Processing optimized surface condition is accordingly a) providing an electrical steel flat product having at least one surface thereof an insulating layer, and generates b) on the insulating layer is a maximum of 5 mi h, in particular less than 5 gm, thick resist layer.
  • the flat electrical steel product provided in step a) can be produced in a conventional manner, for example by using the method known in the prior art explained at the outset.
  • a lacquer layer is now applied to the insulation layer provided by the flat electrical steel product provided.
  • Their thickness is dimensioned such that they only marginally influence the spacing of sheet metal blanks obtained from an electrical steel flat product according to the invention in a stack and, as a result, the dimensions and magnetic properties of a transformer core formed by such a stack. This is especially true if the thickness of the Lacquer layer is less than 5 gm, in particular at most 2 gm or at most 1 gm.
  • a lacquer layer applied according to the invention typically has a minimum thickness of 0.5 gm.
  • Frictional properties of an unpainted insulation layer can be shifted into an optimal value range for automatic handling.
  • electromagnetic applications (“electrical steel flat product”) encompasses
  • 5 gm in particular less than 5 gm, is thick and is composed of more than 50% by weight of organic components.
  • the lacquer layer provided according to the invention for modifying the rubbing properties of the surface of a flat electrical steel product can be applied to the surface in question in any manner known from the prior art for this purpose.
  • Conventional roll coaters or squeegees are suitable for this, with which the paint used in each case is suitable
  • Layer thickness if necessary by applying two or more passes.
  • a coater can be used, which only has one side at a time Coating steel flat product, the electric steel flat product to be painted can be run twice over the same system, where necessary it is turned between the two runs. If two coaters of this type are available, these can be run through in succession in order to apply the lacquer layer one after the other on both sides of the flat electrical steel product.
  • step b) of the method according to the invention then comprises the steps b.1) which are usually carried out in the prior art for this purpose. Applying a solvent-free lacquer as a wet film to the surface of the insulation layer,
  • the invention is based on the knowledge that, based on a conventional coating system designed for the coating of stainless steel sheets, the surface properties of flat electrical steel products of the type in question can be influenced in a simple and favorable manner.
  • the paint provided for the application to the surface at a temperature of 20 ° C has a Brookfield viscosity of less than 5000 mPas with a spindle 3, a wet film of particularly uniform distribution and thickness can be applied to the insulation layer.
  • Lacquers applied according to the invention contain at least the following
  • B 5-60% by weight of at least one monofunctional (meth) acrylate or a di-, tri- or poly (meth) acrylate compound, which is in each case liquid at 20 ° C.
  • the starting point for the lacquer layer produced according to the invention can be the solution-free coating agent proposed in DE 101 44 531 B4 for producing an anti-fingerprint coating, which can be cured by irradiation with ultraviolet light.
  • the content of DE 101 44 531 B4 is hereby incorporated into the present application by reference to the invention.
  • the coating agent known from DE 101 44 531 B4 is mixed with an organic or inorganic UV pigment preparation, by the addition of which the desired setting of that according to the invention is added painted surface existing friction properties is made particularly effective.
  • the lacquer layer can be thermal or actinic radiation, such as UV radiation or, in a manner known per se
  • the lacquer can contain, as a hardenable component, an acrylate resin that can be hardened by radiation.
  • the lacquer is composed at least partially, preferably predominantly, of an acrylate resin.
  • Reactive thinners such as monofunctional (meth) acrylate or di-, tri- or poly (meth) acrylate compounds, are inexpensive to achieve a high surface hardness while the highly pigmented coating dries out.
  • an acrylate combination in which the aforementioned different UV acrylates each have a third, has proven particularly useful.
  • the volume shrinkage of the applied lacquer layer is to be adjusted in a manner known per se so that the adhesion of the lacquer layer to the
  • Insulation layer of the provided electrical steel flat product is not impaired in the course of drying and hardening.
  • the lacquer applied in accordance with the invention may further contain the following component:
  • the covering of the substrate formed by the insulation layer of the flat electrical steel product provided by the lacquer layer produced thereon according to the invention can be ensured particularly effectively by the pigments optionally added to the lacquer applied according to the invention.
  • One or more pigments selected from the group of “carbon black, graphite, molybdenum sulfide, talc, iron oxide black or titanium dioxide pigments” are particularly suitable as optionally added component C.
  • Carbon black, graphite and molybdenum sulfide in particular are substances which, according to the knowledge of the invention, are suitable for reducing the sliding friction behavior of a surface of an insulation layer present on an electrical steel flat product. Soot and graphite particles have been found to be particularly suitable for adjusting the frictional properties of the surface of a flat steel product according to the invention.
  • talc, iron oxide black or titanium dioxide pigments contribute to a particularly good hiding power based on the property of these pigments to absorb light.
  • the total proportion of the particulate pigments optionally present in the lacquer includes both pigments selected from a first group "carbon black, graphite, molybdenum sulfide” and pigments selected from a second group "talc, iron oxide black and titanium dioxide", , it is advantageous if the relative proportion of pigments of the first group is preferably at least 5% by weight, in particular at least 8% by weight or 10% by weight, in each case based on the total proportion of the particulate pigments, one being optimal effect of the pigments of the first group with relative, ie related to the total amount of pigments in the paint
  • the proportion of the pigments of the first group should not exceed 40% by weight, in order to avoid disadvantageous flow properties of the lacquer and to ensure optimal wetting and optimal behavior in the
  • At least 0.5-10% by weight of a pigment selected from the group "carbon black, graphite or molybdenum sulfide", based on the paint formulation, can be present as component C in the paint applied according to the invention.
  • the method according to the invention applied coating formulation in total at least 10% by weight
  • the pigment content ensures that any unevenness on the surface of the insulation layer is covered in such a way that an optimally flat and therefore smooth surface with a low coefficient of friction m H is obtained.
  • Pigment contents of at least 15% by weight, in particular at least 20% by weight, have proven to be particularly expedient with regard to the setting of the static friction behavior of the surface provided with a lacquer coating in the manner according to the invention.
  • the varnish applied according to the invention is preferably solvent-free in order to avoid the formation of pores and other surface defects in the varnish layer due to volatile constituents which outgass upon application, during drying or during curing.
  • Solvent-free in the sense of the present invention means that in the lacquer applied according to the invention the sum of the contents of volatile organic compounds with a boiling temperature at 1 atm (1,01325 bar) of less than 100 ° C. is less than 5% by weight, in particular less than 1% by weight or optimally less than 0.5% by weight.
  • the coating layer is typically applied at temperatures of up to 90 ° C, so that the operational safety of the
  • the method according to the invention is advantageous if the flat electrical steel product to be coated has a temperature of at least 60 ° C., in particular at least 80 ° C., for the application of the lacquer, the
  • Temperature of the flat electrical steel product should not exceed 120 ° C, especially not more than 100 ° C, to have a negative impact on the
  • the thickness of the lacquer layer applied according to the invention can be determined using
  • Magnetic induction can be determined according to ISO 2178.
  • a grain-oriented flat steel product according to the invention for electromagnetic applications comprises
  • a grain-oriented electrical sheet coated with a lacquer layer in the manner according to the invention typically has a static friction coefficient m H of 0.20-0.35 on the free surface of the lacquer layer.
  • An optimum working window for the formulation with regard to the applicability and the covering capacity and for setting the desired sliding friction coefficient, based on the lacquer layer, is in the range of 15-40% by weight of a pigment selected from the group "carbon black (carbon black), graphite, molybdenum sulfide, talc , Iron oxide black and titanium dioxide ”.
  • the pigment particles according to the invention are optionally present in the lacquer applied to the steel substrate of the flat steel product to form the lacquer layer with particle diameters of ⁇ 5 pm, with particle diameters of at least 0.05 pm in practice with regard to the effectiveness and distribution of the particles have proven particularly effective, and with particle diameters of at most 2 pm, in particular at most 1 pm, the effect achieved by the optional presence of the particles sets in particularly reliably.
  • Lacquer layer according to the invention results if the proportion of the particulate pigment based on the lacquer layer is at least 20% by weight.
  • the desired particle size of the pigment content optionally present in the lacquer applied according to the invention of less than 5 pm is during the
  • a lacquer layer applied according to the invention on the insulation layer of a flat electrical steel product contains a binder based on acrylates and / or urethanes, preferably based on acrylates, the proportion of acrylates in the lacquer coating preferably being at least 80% by weight based on the sum of the contents organic components of the lacquer coating is.
  • the steel substrate of an electrical steel flat product according to the invention consists of steel alloys typical of electrical steel flat products.
  • the steel substrate can thus be produced from a steel which consists of (in% by weight) 1.5-6.0% Si, optionally further elements and, due to the production process, unavoidable
  • An example of such an alloy is a steel which consists of (in% by weight) 1.5-4.0% Si, 0.02-0.20% Cr, 0.01-0.35% Cu, 0 , 03 - 0.20% Sn, 0.03 - 0.30% Mn, 0.01 - 0.03% P, balance iron and unavoidable impurities.
  • the invention is suitable for use on all grain-oriented flat steel products which are provided with an insulation layer.
  • Insulation layers are applied in particular to grain-oriented flat electrical steel products, for which the application of a
  • paint layer according to the invention has proven to be particularly useful.
  • the insulation layer of flat electrical steel products of the type according to the invention is obtained and produced in a conventional manner, as described, for example, in the publications cited at the beginning. So there is
  • Insulation layer composed of the components silicon dioxide, a phosphate and a metal oxide, the insulation layer being predominantly amorphous.
  • a transformer sheet metal stack according to the invention consists of blanks which are divided from flat electrical steel products according to the invention and
  • All blanks are at least on one side, preferably on both sides, in the area of the surface of another
  • the surface coming into contact with the blank is provided with a lacquer coating according to the invention which is composed of more than 50% by weight, preferably more than 60% by weight, of organic constituents and is applied in a layer thickness which is spaced apart along the Stacking of immediately adjacent electrical steel sections (in each case defined as the sum of the layer thicknesses of the lacquer coatings on the facing surfaces of immediately adjacent electrical steel sections and measured in each case by means of magnetic induction according to ISO 2178) results in less than 5 pm, preferably less than 2 pm, the coefficient of static friction of the surface of one blank provided with the lacquer layer is greater than or equal to 0.20 and less than or equal to 0.35.
  • the lacquer layer applied according to the invention does not transmit tensile stress to the insulation layer covered by it or to the steel substrate carrying the insulation layer, but only serves to adjust the sliding behavior on the top of the insulation layer.
  • Compressive force F N of 0.3 MPa Compressive force F N of 0.3 MPa.
  • the respective outer blanks are loaded with a tensile force FR directed in the same direction, while the blank in the middle is loaded with a tensile force FR which is oriented in the opposite direction but is of the same size as that exerted on the other two blanks Traction FR.
  • the tensile forces FR are continuously increased until the blanks are relative to one another move.
  • the value of the pulling force reached at this point is called F R rriax .
  • the static friction coefficient m H can then be determined as follows:
  • soot particles are used as particles (component C) in the lacquer applied according to the invention
  • a coating according to the invention can also be clearly characterized using the analysis method "Fourier-Transformed Infrared Spectroscopy” (FTIR).
  • FTIR Fourier-Transformed Infrared Spectroscopy
  • the DRIFT (Diffuse Reflectance Infrared Fourier Transformation) process is the conventional ATR process
  • Insulation coating recorded and thus enables full characterization.
  • the peak of the soot is 731 cm 1 . It has a certain width so that the peak integral int (peak carbon black) of 690 cm 1 to 760 cm 1 is formed for quantification.
  • the acrylate peak at 1740 cm 1 serves as the reference peak.
  • the integral int (peak acrylate) is integrated over the range from 1690 cm 1 to 1780 cm 1 .
  • the respective peak integrals can be determined using the OPUS VERSION 7.2 device software offered by Bruker Corporation, Billerica, USA, subtracting the baseline.
  • the quotient Q is formed from the peak integrals int (peak carbon black) and int (peak acrylate):
  • Stiction coefficient PH from 0.20 to 0.35.
  • the steel substrate each consisted of one of the steels A - D, the composition of which is given in Table 1.
  • the electrical steel flat product samples were also conventionally coated with a 0.5-3 ⁇ m thick insulation layer, which consisted of a Forsterite (Mg 2 Si0 4 ) layer and an overlying layer of a silica / silicate glass, which optionally contained up to 10 wt .-% Cr.
  • a Forsterite (Mg 2 Si0 4 ) layer and an overlying layer of a silica / silicate glass, which optionally contained up to 10 wt .-% Cr.
  • a part of the samples has been coated with a lacquer layer in accordance with the requirements of the invention, while another part of the samples has been lacquer-coated for comparison, but with outside the
  • Lacquer formulations according to the invention A third part of the samples also remained uncoated for comparison.
  • the samples were first pretreated alkaline or acidic for surface cleaning. Spray degreasing at 60 ° C has proven itself here.
  • the samples were also heated before coating, with temperatures of 80 - 100 ° C being found to be optimal.
  • the respective coating layer was applied to the samples heated in this way using a conventional three-roller coater, in which the
  • Rubberization of the application roller had a hardness of at least 80 Shore A.
  • a paint was provided which, as component A, contained 33% by weight urethane acrylate with a viscosity of 1800-2200 mPas (at 60 ° C) and 33% by weight epoxy acrylate with a viscosity of 2500-3500 mPas (at 60 ° C) and as component B contained 34% by weight alkoxylated triacrylate with a viscosity of 50-100 mPas (at 25 ° C).
  • the overall formulation had a viscosity of 500 - 800 mPas at 25 ° C.
  • the viscosities were determined using a spindle 3 according to Brookfield.
  • the pigments (component C) iron oxide black, titanium dioxide and soot particles are each in the form of a pigment preparation with component B and an im Grindometers according to Hegman (DIN 53203) determined particle diameters of less than 5 pm were provided and were formulated accordingly. With a constant proportion of iron oxide black (14% by weight) and titanium dioxide (3.75% by weight), only the proportion of soot particles was varied.
  • the varnish layer was cured with commercially available UV lamps for 1 to 5 seconds, with the entire radiation spectrum being from 250 nm to 450 nm
  • Table 2 shows the steel of the steel substrate of the electrical flat steel product sample used in each case, the soot content R in the lacquer layer, the quotient Q - as far as can be determined - the static friction m H for the tests carried out
  • Stiction of friction m H on the surface of the sample can be done very precisely.
  • the additives in the lacquer layer are significantly larger, so that the reproducibility is restricted.
  • the acrylate peak serving as the reference peak is 1740 cm 1 , the associated integral int (peak acrylate) extending over the range from 1690 cm 1 to 1780 cm 1 and having a value of 55.9 in the example shown in FIG. 1 .

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Abstract

L'invention concerne un procédé de fabrication de produits plats en acier à grains orientés pour des utilisations électromagnétiques (« produits plats en acier électriques »), qui présentent de manière fiable une nature de surfaces variant dans tous les cas au sein d'une étroite fenêtre de tolérance et sont adaptés en vue d'un empilement peu coûteux à automatisation mécanique. Le procédé selon l'invention prévoit à cet effet a) de fournir un produit plat en acier électrique, qui comporte sur au moins une de ses surfaces une couche d'isolation, et b) de générer sur la couche d'isolation une couche de peinture présentant une épaisseur inférieure à 5 μm. Un produit plat en acier à grains orientés selon l'invention comprend de manière correspondante un substrat en acier, en option une couche de forstérite générée sur celui-ci, une couche d'isolation appliquée sur le substrat en acier ou la couche de forstérite présente en option, et une couche de peinture appliquée sur la couche d'isolation, qui présente une épaisseur maximale de 5 μm et est composée de constituants organiques à plus de 50 % en poids. Des produits en acier plats de ce type sont particulièrement adaptés en raison de la nature de leurs surfaces générée selon l'invention pour former des empilements de tôles de noyau pour des transformateurs.
PCT/EP2018/079898 2018-10-31 2018-10-31 Procédé servant à fabriquer un produit plat en acier à grains orientés pour des utilisations électromagnétiques, produit plat en acier pour des utilisations électromagnétiques, et empilement de transformateurs-noyaux fabriqué à partir d'un produit plat en acier de ce type Ceased WO2020088764A1 (fr)

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PCT/EP2018/079898 WO2020088764A1 (fr) 2018-10-31 2018-10-31 Procédé servant à fabriquer un produit plat en acier à grains orientés pour des utilisations électromagnétiques, produit plat en acier pour des utilisations électromagnétiques, et empilement de transformateurs-noyaux fabriqué à partir d'un produit plat en acier de ce type

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PCT/EP2018/079898 WO2020088764A1 (fr) 2018-10-31 2018-10-31 Procédé servant à fabriquer un produit plat en acier à grains orientés pour des utilisations électromagnétiques, produit plat en acier pour des utilisations électromagnétiques, et empilement de transformateurs-noyaux fabriqué à partir d'un produit plat en acier de ce type

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2247269C3 (de) 1971-09-27 1981-05-14 Nippon Steel Corp., Tokyo Verfahren zur Herstellung einer isolierenden sowie die Magnetostriktions-Charakteristika und den Eisenverlust verbessernden Schicht auf einem Silicimstahlblech
JPH09291373A (ja) * 1996-04-26 1997-11-11 Kawasaki Steel Corp 磁気シールド材
EP1025268B1 (fr) 1997-10-15 2002-05-08 ThyssenKrupp Stahl AG Procede de production d'une tole electrique a grains orientes avec une faible perte par inversion magnetique et une polarisation elevee
US20040225039A1 (en) * 2001-09-11 2004-11-11 Karsten Hackbarth UV-curing anti-fingerprinting coatings
EP2022874A1 (fr) 2006-05-19 2009-02-11 Nippon Steel Corporation Tôle d'acier électromagnétique directionnel comportant un film de revêtement isolant de tension élevéee, et prodécédé de traitement du film de revêtement isolant
DE102008008781A1 (de) 2008-02-12 2009-08-20 Thyssenkrupp Electrical Steel Gmbh Verfahren zur Herstellung eines kornorientierten Elektrobands
DE102010038038A1 (de) 2010-10-07 2012-04-12 Thyssenkrupp Electrical Steel Gmbh Verfahren zum Erzeugen einer Isolationsbeschichtung auf einem kornorientierten Elektro-Stahlflachprodukt und mit einer solchen Isolationsbeschichtung beschichtetes Elektro-Stahlflachprodukt
EP2902509A1 (fr) * 2014-01-30 2015-08-05 Thyssenkrupp Electrical Steel Gmbh Produit plat d'acier électrique à orientation de grains comprenant un revêtement d'isolation
US20180022927A1 (en) * 2015-02-05 2018-01-25 Nippon Steel & Sumitomo Metal Corporation Electrical steel sheet

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2247269C3 (de) 1971-09-27 1981-05-14 Nippon Steel Corp., Tokyo Verfahren zur Herstellung einer isolierenden sowie die Magnetostriktions-Charakteristika und den Eisenverlust verbessernden Schicht auf einem Silicimstahlblech
JPH09291373A (ja) * 1996-04-26 1997-11-11 Kawasaki Steel Corp 磁気シールド材
EP1025268B1 (fr) 1997-10-15 2002-05-08 ThyssenKrupp Stahl AG Procede de production d'une tole electrique a grains orientes avec une faible perte par inversion magnetique et une polarisation elevee
US20040225039A1 (en) * 2001-09-11 2004-11-11 Karsten Hackbarth UV-curing anti-fingerprinting coatings
DE10144531B4 (de) 2001-09-11 2006-01-19 Henkel Kgaa UV-härtende anti-fingerprint Beschichtungen, Verfahren zum Beschichten und Verwendung eines lösmittelfreien Überzugsmittels
EP2022874A1 (fr) 2006-05-19 2009-02-11 Nippon Steel Corporation Tôle d'acier électromagnétique directionnel comportant un film de revêtement isolant de tension élevéee, et prodécédé de traitement du film de revêtement isolant
DE102008008781A1 (de) 2008-02-12 2009-08-20 Thyssenkrupp Electrical Steel Gmbh Verfahren zur Herstellung eines kornorientierten Elektrobands
DE102010038038A1 (de) 2010-10-07 2012-04-12 Thyssenkrupp Electrical Steel Gmbh Verfahren zum Erzeugen einer Isolationsbeschichtung auf einem kornorientierten Elektro-Stahlflachprodukt und mit einer solchen Isolationsbeschichtung beschichtetes Elektro-Stahlflachprodukt
EP2902509A1 (fr) * 2014-01-30 2015-08-05 Thyssenkrupp Electrical Steel Gmbh Produit plat d'acier électrique à orientation de grains comprenant un revêtement d'isolation
US20180022927A1 (en) * 2015-02-05 2018-01-25 Nippon Steel & Sumitomo Metal Corporation Electrical steel sheet

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