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DE2718332A1 - HEAT-RESISTANT POROESES COMPOSITE MATERIAL - Google Patents

HEAT-RESISTANT POROESES COMPOSITE MATERIAL

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Publication number
DE2718332A1
DE2718332A1 DE19772718332 DE2718332A DE2718332A1 DE 2718332 A1 DE2718332 A1 DE 2718332A1 DE 19772718332 DE19772718332 DE 19772718332 DE 2718332 A DE2718332 A DE 2718332A DE 2718332 A1 DE2718332 A1 DE 2718332A1
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DE
Germany
Prior art keywords
composite material
mixture
material according
aluminum oxide
heat
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.)
Pending
Application number
DE19772718332
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German (de)
Inventor
Jean Daviot
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.)
Novatome Industries SA
Original Assignee
Novatome Industries SA
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Filing date
Publication date
Application filed by Novatome Industries SA filed Critical Novatome Industries SA
Publication of DE2718332A1 publication Critical patent/DE2718332A1/en
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/34—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/02—Linings
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/34—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders
    • C04B28/342—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders the phosphate binder being present in the starting composition as a mixture of free acid and one or more reactive oxides
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
    • C04B35/111—Fine ceramics
    • C04B35/117—Composites
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
    • C04B35/486—Fine ceramics
    • C04B35/488—Composites
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/6303—Inorganic additives
    • C04B35/6306—Binders based on phosphoric acids or phosphates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/6303—Inorganic additives
    • C04B35/6306—Binders based on phosphoric acids or phosphates
    • C04B35/6309—Aluminium phosphates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/71—Ceramic products containing macroscopic reinforcing agents
    • C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
    • C04B35/80—Fibres, filaments, whiskers, platelets, or the like
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/52—Constituents or additives characterised by their shapes
    • C04B2235/5208—Fibers
    • C04B2235/5216—Inorganic
    • C04B2235/522—Oxidic
    • C04B2235/5228—Silica and alumina, including aluminosilicates, e.g. mullite
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/52—Constituents or additives characterised by their shapes
    • C04B2235/5208—Fibers
    • C04B2235/526—Fibers characterised by the length of the fibers
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/52—Constituents or additives characterised by their shapes
    • C04B2235/5292—Flakes, platelets or plates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Composite Materials (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Glass Compositions (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Porous Artificial Stone Or Porous Ceramic Products (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Ceramic Products (AREA)

Description

HITZEBESTÄNDIGES PORÖSES 9718332 VERBUNDMATERIAL L ' 'HEAT RESISTANT POROUS 9718332 COMPOSITE MATERIAL L ' '

Die Erfindung betrifft ein hitzebeständiges poröses Verbundmaterial, das aus einer Mischung von Keramikfasern und Zuschlagstoffen besteht, die durch ein Metallphosphat gebunden werden, und das eine Porosität von mindestens 50%,The invention relates to a heat-resistant porous composite material made from a mixture of ceramic fibers and aggregates that are bound by a metal phosphate and that have a porosity of at least 50%,

22

einen Young'sehen Modul zwischen 30.000 kg/cm und 100.0OO kg/cma Young's modulus between 30,000 kg / cm and 100,000 kg / cm

2 und eine Quetschfestigkeit von mehr als 100 kg/cm aufweist.2 and has a crush strength of more than 100 kg / cm.

Es sind bereits verschiedene Arten von hitzebeständigen Isolierstoffen bekannt, die sowohl dem thermischen als auch dem chemischen Einfluß von schmelzflüssigem Aluminium widerstehen. Unter diesen ist ein hitzebeständiger Beton bekannt, der aus einem feuerfesten Zement und Keramikfasern besteht, bei denen die Bindung zwischen den Fasern und dem Zement in heißem Zustand durch teilweises Sintern des Betons erreicht wird.There are already various types of heat-resistant insulating materials known, both the thermal as also resist the chemical influence of molten aluminum. Among them is a heat-resistant concrete known, which consists of a refractory cement and ceramic fibers, in which the bond between the fibers and the Cement in the hot state is achieved by partially sintering the concrete.

Bei genauer Untersuchung dieser bekannten hitzebeständigen Stoffe konnte festgestellt werden, daß bei diesen Stoffen die Art der Bestandteile des verwendeten Zements einen nachteiligen Einfluß auf die Beständigkeit dieser Stoffe ausüben kann, wenn sie mit aktiven schmelzflüssigen Metallen wie beispielsweise Gußeisen oder Aluminium in Berührung treten.Upon closer examination of these known heat-resistant materials, it was found that the nature of the constituents of the cement used can have an adverse effect on the resistance of these materials when they come into contact with active molten metals such as cast iron or aluminum.

Es sind auch hitzebeständige poröse Materialien bekannt, bei denen einzelne Körner mit einem Binder wie beispiels-There are also heat-resistant porous materials known in which individual grains with a binder such as

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weise Aluminiummonophosphat verbunden und unter Druck bei hoher Temperatur gesintert werden. Abgesehen davon, daß die unter Druck erhaltenen Stoffe nicht während ihrer Herstellung gegossen werden können, weisen sie darüber hinaus den Nachteil auf, zu leicht von schmelzflüssigen Metallen benetzbar zu sein.wise aluminum monophosphate can be combined and sintered under pressure at high temperature. Apart from the fact that the Substances obtained under pressure cannot be cast during their production, they also exhibit the disadvantage of being too easily wettable by molten metals.

Ziel der Erfindung ist es also, ein poröses hitzebeständiges Verbundmaterial herzustellen, das diese Nachteile nicht mehr aufweisen.The aim of the invention is therefore to produce a porous, heat-resistant composite material that has these disadvantages no longer show.

Gegenstand der Erfindung ist daher ein hitzebeständiges poröses Verbundmaterial, das aus einer Mischung von Keramikfasern und Zuschlagstoffen besteht, die durch ein MetallphosphatThe invention therefore relates to a heat-resistant porous composite material which consists of a mixture of ceramic fibers and aggregates, which is replaced by a metal phosphate gebunden werden, und das eine Porosität von mindestens 50%,be bound, and that has a porosity of at least 50%,

22

einen Young'sehen Modul zwischen 30.0OO kg/cm und 100.0OO kg/cma Young's modulus between 30,000 kg / cm and 100,000 kg / cm

2 und eine Quetschfestigkeit von mehr als 100 kg/cm aufweist, dadurch gekennzeichnet, daβ die Zuschlagstoffe 50 bis 89 Gewichtsprozent der Mischung ausmachen und daß sie unter der Gruppe von Stoffen gewählt werden, die aus Aluminiumoxyd, Korund, Zirkonoxyd und blattförmigem Aluminiumoxyd gebildet wird. 2 and has a crush strength of more than 100 kg / cm, characterized in that the aggregates make up 50 to 89 percent by weight of the mixture and that they are selected from the group of substances formed from aluminum oxide, corundum, zirconium oxide and aluminum oxide leaf.

Auf diese Weise konnte ein weiter Fächer von Stoffen hergestellt werden, die Keramikfasern mit einem Anteil von 9 bis 50 Gewichtsprozent der Mischung, Zuschlagstoffe mit einem Anteil von 50 bis 89 Gewichtsprozenten der Mischung und einenIn this way, a wide range of fabrics could be produced, the ceramic fibers with a proportion of 9 up to 50 percent by weight of the mixture, aggregates with a proportion of 50 to 89 percent by weight of the mixture and one

Binder mit 2 bis 10 Gewichtsprozenten der Mischung enthalten.Contain binder at 2 to 10 percent by weight of the mixture.

des/of/

Zur Bildung^xne Phosphatbindung entwickelnden Binders können handelsübliche Binder mit Orthophosphorsäure,To form a binder that develops a phosphate bond, commercially available binders can be mixed with orthophosphoric acid,

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Aluminiumphosphate oder Aluminiumchlorophosphat verwendet werden. Der handelsübliche Binder konnte auch durch eine 5O%ige Aluminiummonophosphatlösung ersetzt werden.Aluminum phosphates or aluminum chlorophosphate can be used. The commercially available binder could also be used with a 5O% strength Aluminum monophosphate solution can be replaced.

Anhand der nachfolgend beschriebenen Beispiele können der Nutzen des oben definierten Materials und seine einfacheWith the help of the examples described below, the usefulness of the material defined above and its simplicity

Herstellungsweise besser verstanden werden.Manufacturing method can be better understood.

industriellen In einem/pianetenmischer wurden 2,260 kg blattförmigesindustrial In a / pianeten mixer 2.260 kg of leaf-shaped

Aluminiumoxyd T6O mit der Kornobergrenze 17 und 0,540 kg Tonerdefaser gemischt. Während des Mischvorgangs wird die Faser gebrochen. So erhält man eine Mischung aus einem Pulver und aus Faserbruchstücken von einem Millimeter Länge.Aluminum oxide T6O with a grain size upper limit of 17 and 0.540 kg of alumina fiber mixed. During the mixing process, the fiber becomes Broken. This gives a mixture of a powder and fiber fragments one millimeter in length.

Anschließend wird 0,060 kg pulverförmiger Phosphorbinder hinzugegeben und die Mischung in trockenem Zustand homogenisiert.Then 0.060 kg of powdered phosphorus binder is added and the mixture is homogenized in the dry state.

Daraufhin werden langsam 1000 cm Wasser hinzugefügt. Man erhält so eine Paste, die in eine auf einem Vibriertisch befestigte Form gegossen werden kann. Die Formwandungen werden zuvor mit einem herkömmlichen Entformer (auch "Trennemulsion" genannt) eingerieben.Then 1000 cm of water are slowly added. A paste is thus obtained that is poured into one on a vibrating table attached form can be poured. The mold walls are previously removed with a conventional mold release (also known as "release emulsion") called) rubbed in.

In der Form wird die Masse gerade solange Vibrationen ausgesetzt, bis das Material die Form gut angenommen hat, jedoch darf das Material auf keinen Fall solange auf dem Vibrationstisch bleiben, bis in irgendeiner Form eine Trennung der Bestandteile auftritt.In the mold, the mass is exposed to vibrations until the material has assumed the shape well, however Under no circumstances should the material remain on the vibrating table until the components are separated in some way occurs.

Dann wird das Material zwei Stunden lang in der Form gelassen, damit es abbinden kann. Nach einer Trocknung im Trockenschrank bei 2OO Grad C erhält man ein Formprodukt, das seine endgültige Form angenommen hat. Die Schrumpfung ist sehr gering, kleiner als O,5%; das bedeutet, daß bei einem 10 cmThe material is then left in the mold for two hours to allow it to set. After drying in Drying cabinet at 2OO degrees C you get a molded product that has assumed its final shape. The shrinkage is great low, less than 0.5%; that means that with a 10 cm

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langen Stab die Schrumpfung in Längsrichtung kleiner als 1/2 Millimeter ist.long rod, the longitudinal shrinkage is less than 1/2 millimeter.

Zur vollkommenen Entfernung des evtl. noch trotz der Trocknung bei 200 Grad C in den Poren verbliebenen Wassers kann es vorteilhaft sein, das geformte Produkt im Ofen langsam auf 800 Grad C zu erhitzen.To completely remove any water that may still remain in the pores despite the drying at 200 degrees C. It may be advantageous to slowly heat the molded product to 800 degrees C in the oven.

Das Material weist dann folgende Eigenschaften auf sThe material then has the following properties s

- Dichte 1,7- density 1.7

- Totalporosität gleich oder größer 55%- Total porosity equal to or greater than 55%

- Young*scher Modul 30.0OO kg/cm- Young's modulus 30,0OO kg / cm

- Quetschfestigkeit lOO kg/cmCrush strength 100 kg / cm

- Wärmeleitfähigkeitskoeffizient bei 300 Grad C = 0,3 Watt/m,Grad,h- Coefficient of thermal conductivity at 300 degrees C = 0.3 watt / m, degree, h

Das Endprodukt wird bei Umgebungstemperatur durch chemische Reaktion erhalten, das Erhitzen dient lediglich zur Entfernung der letzten Wassermoleküle.The end product is obtained by chemical reaction at ambient temperature, heating is only used for Removal of the last water molecules.

Die thermische Stoßfestigkeit des so erhaltenen hitzebeständigen Materials ist außergewöhnlich groß, ohne den geringsten Schaden oder auch nur teilweise Zerstörung hält dieses Material das wie derholte Eintauchen in eine schmelzflüssige Aluminiumlegierung oder reines schmelzflüssiges Aluminium aus.The thermal shock resistance of the heat-resistant material obtained in this way is extraordinarily high, and it holds without the slightest damage or even partial destruction Material consists of repeated immersion in a molten aluminum alloy or pure molten aluminum.

Ein ähnliches Material wurde unter Einschluß von Aluminiummonophosphat bei Trockenmischung von 2,26O kg Aluminiumoxyd in Pulverform (Siebgröße 17) mit 0,54O kg Aluminiumoxydfasern erhalten.A similar material was obtained with the inclusion of aluminum monophosphate by dry mixing 2.260 kg of aluminum oxide in powder form (sieve size 17) with 0.540 kg of aluminum oxide fibers.

Anschließend werden 0,540 kg 50%iger Aluminiumphosphatlösung in 1 Liter Wasser hinzugegeben.Then 0.540 kg of 50% aluminum phosphate solution in 1 liter of water are added.

In diesem Fall muß das formgegossene Material während des T rocken vor gangs in seiner Form bleiben und durf erst nachIn this case, the molded material must during stay in its shape after drying and only afterwards

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der Trocknung bei 200 Grad C entformt werden.demoulded after drying at 200 degrees C.

Bei Verwendung von stark sauren Bindern muß der Mischung
trockenen/Magnesia mit weniger als 2% Gewichtsanteil zur Neutralisierung des Säureüberschusses hinzugefügt werden. Das Endprodukt bleibt unverändert.When using strongly acidic binders, the mixture must
dry / magnesia with less than 2% by weight can be added to neutralize the excess acid. The end product remains unchanged.

Bei der Beschreibung des ersten Beispiels wurde die Korngröße des Zuschlagstoffes genau angegeben. Die Erfahrung zeigt jedoch, daß der Einsatz eines weniger feinpulvrigen Zuschlagstoffes die Qualität des Endprodukts nicht spürbar mindert.In the description of the first example, the grain size of the aggregate was specified precisely. Experience shows, however, that the use of a less finely powdered additive does not noticeably reduce the quality of the end product.

Bei den oben angegebenen Versuchen handelt es sich bei dem Zuschlagstoff um Aluminiumoxydpulver. Die Verwendung von anderen Zuschlagstoffen wie beispielsweise Zirkonoxyd, tonerdehaltiger und siliziumhaltiger Schamott, Korund oder blattförmiges Aluminiumoxyd hat ebenfalls gleichermaßen zufriedenstellende Ergebnisse erbracht.In the experiments given above, the aggregate is aluminum oxide powder. The usage of other additives such as zirconium oxide, fireclay containing alumina and silicon, corundum or sheet alumina has also given equally satisfactory results.

Die erfindungsgemäße Gruppe von Materialien ist daher deutlich von Verbundstoffen unterschieden, bei denen die Bindung durch teilweises Sintern des Zements erhalten wird oder, wie im Falle von Zementen auf Kalziumaluminatbasis, durch Reaktion unter Hitzeeinwirkung des Kalks CaO des Zements mit der hitzebeständigen Faser. Diese Einwirkung wurde lediglich im Endstadium der Erhitzung erreicht, während im vorliegenden Fall die chemische Bindung im allgemeinen in kaltem Zustand erfolgt. Daher kann im vorliegenden Fall das Material anschließend an der Luft bei mehr oder weniger hoher Temperatur getrocknet werden, ohne daß sich am Zustand des Endprodukts The group of materials according to the invention is therefore clearly different from composites in which the bond is obtained by partial sintering of the cement or, as in the case of calcium aluminate-based cements, by reaction of the lime CaO of the cement with the heat-resistant fiber under the action of heat. This action was only achieved in the final stage of heating, while in the present case the chemical bond generally takes place in the cold state. Therefore, in the present case, the material can then be dried in air at a more or less high temperature without affecting the condition of the end product

709846/0842709846/0842

etwas ändert.something changes.

Das erfindungsgemäBe Material kann vorteilhafterweise bei der Herstellung von Geräten zur Handhabung, zum Transport, zur Reinigung und zur Formung von schmelzflüssigem Aluminium bzw. Gußeisen verwendet werden.The material according to the invention can advantageously in the manufacture of equipment for handling, transporting, cleaning and shaping molten aluminum or cast iron can be used.

709846/0642709846/0642

Claims (1)

Fo 10 439 DFo 10 439 D. 2 5. April 1977April 5, 1977 NOVATOME industries S.A. 20, avenue Edouard Herriot 92350 LE PLESSIS ROBINSON FrankreichNOVATOME industries S.A. 20, avenue Edouard Herriot 92350 LE PLESSIS ROBINSON France PATENTANSPRÜCHEPATENT CLAIMS ( 1 - Hitzebeständiges poröses Verbunctaaterial, das aus einer Mischung von Keramikfasern und Zuschlagstoffen besteht, die durch ein Metallphosphat gebunden werden, und das eine Porosität von mindestens 50%, einen Young1sehen Modul zwischen 30.000 kg/cm und 100.0OO kg/cm und eine Quetschfestigkeit von mehr als 100 kg/cm aufweist, dadurch gekennzeichnet, daβ die Zuschlagstoffe 50 bis 89 Gewichtsprozente der Mischung ausmachen und daβ sie ans der Gruppe von Stoffen gewählt werden, die aus Aluminiumoxyd, Korund, Zirkonoxyd und blattförmigem Aluminiumoxyd gebildet wird.(1 - Heat-resistant porous composite material, which consists of a mixture of ceramic fibers and aggregates, which are bound by a metal phosphate, and which has a porosity of at least 50%, a Young 1 see module between 30,000 kg / cm and 100,0OO kg / cm and has a crushing strength of more than 100 kg / cm, characterized in that 50 to get noticed the aggregates to 89 weight percent of the mixture account for and get noticed them to the group of substances are selected which is formed of aluminum oxide, corundum, zirconia and sheet-like aluminum oxide. 2 - Verbundmaterial nach Anspruch 1, dadurch gekennzeichnet, daß der Binder, mit dem die chemische Phosphatbindung erreicht wird, einen Gewichtsanteil von 2 bis 10% am Gesamtgewicht ausmacht.2 - composite material according to claim 1, characterized in that the binder with which the chemical phosphate binding is achieved, makes up a weight proportion of 2 to 10% of the total weight. 3 - Verbundmaterial nach Anspruch 2, dadurch gekennzeichnet, daß es einen Anteil von 9 bis3 - composite material according to claim 2, characterized in that it has a proportion of 9 to 709846/0842709846/0842 ORIGINAL INSPECTEDORIGINAL INSPECTED - 2 -48% an Fasern enthält, die ihrerseits einen Aluminiumoxydanteil- Contains 2 -48% of fibers, which in turn contain aluminum oxide von mehr als 4096 aufweisen. *of more than 4096. * 4 - Verbundmaterial gemäß Anspruch 3, dadurch gekennzeichnet, daß seine Herstellung folgende Schritte umfaßt :4 - composite material according to claim 3, characterized in that its production is as follows Steps include: - Mischung des pulverförraigen Zuschlagstoffs, der tonerdehalt igen Faser und des chemisch sauren Binders,- Mixture of the powdery aggregate, the alumina fiber and the chemically acidic binder, - langsames Hinzufügen einer Menge Hasser, die größer als 1/4 des Gewichts dieser trockenen Zutaten ausmacht,- slowly adding a lot of haters greater than 1/4 the weight of these dry ingredients, - Formgießen des Materials bis zum Abbinden des Verbundmaterials und anschließendes Trocknen bei Temperaturen bis zu 2OO Grad C.- molding the material until the composite material sets and subsequent drying at temperatures up to 2OO degrees C. 5 - Verbundmaterial nach Anspruch 4, dadurch gekennzeichnet, daß zusätzlich zum Trocknen ein langsames Erhitzen auf 8OO Grad C erfolgt.5 - composite material according to claim 4, characterized in that in addition to drying a slow heating to 800 degrees C takes place. 709846/0842709846/0842
DE19772718332 1976-04-30 1977-04-25 HEAT-RESISTANT POROESES COMPOSITE MATERIAL Pending DE2718332A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7612921A FR2349551A1 (en) 1976-04-30 1976-04-30 Porous refractory mouldings resistant to molten aluminium or iron - contain ceramic fibres and e.g. alumina, bonded by metal phosphate

Publications (1)

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DE2718332A1 true DE2718332A1 (en) 1977-11-17

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AU (1) AU2447877A (en)
CH (1) CH598150A5 (en)
DE (1) DE2718332A1 (en)
FR (1) FR2349551A1 (en)
IT (1) IT1075636B (en)
NO (1) NO771482L (en)
SE (1) SE7705009L (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2499968A1 (en) * 1981-02-16 1982-08-20 Didier Werke Ag DRY MASS TO BE USED AS A FIBROUS PROJECTING MASS
FR2499973A1 (en) * 1981-02-16 1982-08-20 Didier Werke Ag PROCESS FOR THE PREPARATION OF REFRACTORY OR FIRE-RESISTANT MATERIALS, IN GRAIN, CONTAINING CERAMIC FIBERS, MATERIALS PREPARED ACCORDING TO SAID METHOD AND USE THEREOF
GB2269185A (en) * 1992-07-30 1994-02-02 Rolls Royce Plc Improvements in or relating to removal of contaminants from molten metal.

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4935178A (en) * 1986-06-24 1990-06-19 General Signal Corporation Method of making refractory fiber products
EP0417493A3 (en) * 1989-08-14 1991-04-03 Aluminum Company Of America Fiber reinforced composite having an aluminum phosphate bonded matrix
JP5707203B2 (en) * 2011-03-30 2015-04-22 日本碍子株式会社 Honeycomb structure

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2499968A1 (en) * 1981-02-16 1982-08-20 Didier Werke Ag DRY MASS TO BE USED AS A FIBROUS PROJECTING MASS
FR2499973A1 (en) * 1981-02-16 1982-08-20 Didier Werke Ag PROCESS FOR THE PREPARATION OF REFRACTORY OR FIRE-RESISTANT MATERIALS, IN GRAIN, CONTAINING CERAMIC FIBERS, MATERIALS PREPARED ACCORDING TO SAID METHOD AND USE THEREOF
GB2269185A (en) * 1992-07-30 1994-02-02 Rolls Royce Plc Improvements in or relating to removal of contaminants from molten metal.
US5336294A (en) * 1992-07-30 1994-08-09 Rolls-Royce Plc Removal of contaminants from molten metals

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CH598150A5 (en) 1978-04-28
JPS531219A (en) 1978-01-09
AU2447877A (en) 1978-10-26
NO771482L (en) 1977-11-01
SE7705009L (en) 1977-10-31
FR2349551A1 (en) 1977-11-25
IT1075636B (en) 1985-04-22

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