GB2111861A - Improvements in methods of coating surfaces to render them abrasion resistant - Google Patents
Improvements in methods of coating surfaces to render them abrasion resistant Download PDFInfo
- Publication number
- GB2111861A GB2111861A GB08233861A GB8233861A GB2111861A GB 2111861 A GB2111861 A GB 2111861A GB 08233861 A GB08233861 A GB 08233861A GB 8233861 A GB8233861 A GB 8233861A GB 2111861 A GB2111861 A GB 2111861A
- Authority
- GB
- United Kingdom
- Prior art keywords
- layer
- stainless steel
- molybdenum
- coating
- ptfe
- 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.)
- Granted
Links
- 239000011248 coating agent Substances 0.000 title claims abstract description 26
- 238000000576 coating method Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000005299 abrasion Methods 0.000 title claims abstract description 8
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 23
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 23
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 19
- 239000010935 stainless steel Substances 0.000 claims abstract description 19
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 15
- 239000011733 molybdenum Substances 0.000 claims abstract description 15
- 239000000758 substrate Substances 0.000 claims abstract description 13
- 239000000037 vitreous enamel Substances 0.000 claims abstract description 11
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000005507 spraying Methods 0.000 claims abstract description 8
- 239000011347 resin Substances 0.000 claims abstract description 5
- 229920005989 resin Polymers 0.000 claims abstract description 5
- -1 polytetrafluorpropylene Polymers 0.000 claims abstract description 4
- 238000010285 flame spraying Methods 0.000 claims abstract description 3
- 239000010410 layer Substances 0.000 claims description 21
- 239000011159 matrix material Substances 0.000 claims description 6
- 239000000919 ceramic Substances 0.000 claims description 5
- 230000003746 surface roughness Effects 0.000 claims description 4
- 238000007605 air drying Methods 0.000 claims description 2
- 238000000643 oven drying Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 2
- 239000011247 coating layer Substances 0.000 claims 1
- 210000003298 dental enamel Anatomy 0.000 claims 1
- 238000001035 drying Methods 0.000 abstract 1
- 229910001018 Cast iron Inorganic materials 0.000 description 4
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 241000221535 Pucciniales Species 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 231100000206 health hazard Toxicity 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/18—After-treatment
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J36/00—Parts, details or accessories of cooking-vessels
- A47J36/02—Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/11—Vats or other containers for liquids or other fluent materials
-
- 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
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
- B05D5/083—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface involving the use of fluoropolymers
- B05D5/086—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface involving the use of fluoropolymers having an anchoring layer
-
- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- 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
-
- 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
- B05D2350/00—Pretreatment of the substrate
- B05D2350/60—Adding a layer before coating
- B05D2350/63—Adding a layer before coating ceramic layer
-
- 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
- B05D2350/00—Pretreatment of the substrate
- B05D2350/60—Adding a layer before coating
- B05D2350/65—Adding a layer before coating metal layer
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Food Science & Technology (AREA)
- Laminated Bodies (AREA)
Abstract
A method of coating surfaces to render them abrasion resistant which comprises applying a vitreous enamel ground coat to a ferrous substrate, then flame spraying onto the ground coat a layer of stainless steel or molybdenum allowing this to cool, spraying a resin or aqueous based primer, drying and allowing to cool and finally spraying a PTFE or polytetrafluorpropylene (TFE/ HFP) based top coat.
Description
SPECIFICATION
Improvements in methods of coating surfaces to render them abrasion resistant
This invention relates to improvements in methods of coating laminated surfaces to render them abrasion resistant, and a vessel produced therefrom.
A method of coating the surfaces of articles is known which includes the steps of preparing the surface in conventional manner to receive a sprayed coating of molten metal, spraying over said surface a coating of stainless steel or molybdenum to provide a continuous and pervious micro-crenellated intermediate surface with microscopic prominences and interstices, and finally applying a coating of a non-stick agent to the surface and sintering or curing the coating so as to provide a firmly bonded complete covering to the sprayed hard metal coating thus producing an abrasion resistant and non-stick outer surface.
This method has not proved entirely satisfactory as it has been found that the abrasion resistant and non-stick outer surface may be damaged and thus allow moisture to penetrate to the ferrous substrate or foundation of cast iron or mild steel thereby causing corrosion.
The disadvantage in the use of enamelled vessels is that sticking to the inside surface occurs. The enamelling process is normally applied to cast iron or pressed steel pre-forms and requires two coats, which in their application require the vessel to be heated to 8000C.
PTFE is thermally destroyed at temperatures above 450"C and therefor, any application of PTFE is necessary after the aluminium for enamelling has been applied. Heating cast iron or mild steel to 800"C, unless the entire article is covered with an undercoat, ieads to oxidisation of the surface.
If an undercoat is not applied to the inside of the vessel when the PTFE is applied, due to the oxidisation, good adhesion can not be obtained. If PTFE is applied to an enamelled top coat good adhesion is not obtained and the PTFE coating quickly peels off.
The same applies if PTFE is applied to the undercoat.
To overcome this a glass type frit is applied to the internal undercoat, then when the PTFE is applied, which requires some heat, better adhesion has been obtained, but on repeated quenching the glass type frit has a tendency to shatter and the PTFE coating lifts off.
One solution to the problem is to sandblast off the undercoat on the inside of the vessel to reveal bare metal and then to apply the PTFE in the normal way.
The disadvantage of this is that the enamelled coating is likely to be damaged in the grit blasting process. The undercoat contains silica, which in grit blasting can present a health hazard.
The object of the invention is to apply a matrix to an undercoat of vitreous enamel and then apply the
PTFE coating which gives excellant adhesive and anti-corrosion non-stick surface. A steel matrix has the advantage that is the PTFE surface is damaged it prevents water reaching the base metal which is of cast iron or pressed mild steel, which rusts when coming into contact with water.
According to the invention, the method comprises applying a ground coat of vitreous enamel having a surface roughness of 7.5 - 15 micro meter finish at a sinter temperature of 600"C - 700"C to a base substrate, flame spraying onto the ground coat surface a matrix layer of a stainless steel or molybdenum and allowing to cool spraying a resin based or aqueous based primer to the stainless steel or molybdenum layer, air or oven drying and again allowing to cool, and finally spraying on a polytetrafluoroethylene (PTFE) tetrafluoroethylene polyhexafluoropropylene (TFE/HFP) based top coat and storing at a temperature of 200"C - 4500C for 20 to 30 minutes.
The invention will be described with reference to the accompanying drawings:
Figure lisa sectional elevation of a degreased substrate;
Figure 2 is a similar section after the application of a ceramic ground coat;
Figure 3 is a similar section to that shown in Figure 2 after the application of a stainless steel or molybdenum coating over the ceramic ground coat;
Figure 4 is a similar section to Figure 3 after the application of a PTFE coating over the stainless steel or molybdenum coating.
Aferrous substrate a as shown in Figure 1 has applied thereto a coating of vitreous enamel b ceramic ground coat, frit applied to one or more surfaces of the ferrous substrate or foundation a.
The vitreous enamel b (frit) has a surface roughness of about 7.5 - 15 micro meter finish with a sinter temperature of 600"C - 700"C.
A flame spray coating of a layer of stainless steel or molybdenum c about 0.025 - 0.050 mm thick (25 50) is applied to the vitreous enamel coating b (frit) and allowed to cool.
The layer of stainless steel or molybdenum forms an impervious micro-crenallated intermediate surface with microscopic prominences and interstices, to receive a coating of resin based or aqueous based primer (not shown) applied to the stainless steel surfacecwhich is air dried or oven dried at 1200C- 1500C and allowed to cool off.
A PTFE or TFE/HFP based top coat d is sprayed onto the resin or aqueous based primary layer and stored at a temperature of 200"C - 450"C for 20 - 30 minutes.
The PTFE or TFE/HFP coat becomes impregnated in the stainless steel layer c and produces excellent adhesion and a hard non-stick surface, resistant to scratches or abrasion and gives a longer life to the article.
The provision of the stainless steel layer c impregnated with PTFE or TFE/H FP coating dover a protective layer of vitreous enamel b (frit) prevents any abrasive damage or scratching from allowing water to reach the ferrous substrate a and cause corrosion thereof.
Whilst the invention is provisionally designed for use with ferrous based articles it can have advantage in connection with non-ferrous articles.
Claims (7)
1. A method of coating laminated surfaces to render them abrasive resistant comprising bonding an impervious coating of stainless steel or molybdenum to a substrate to form a continuous and impervious micro-crenallated intermediate layer with microscopic prominences and interstices, and a coating of non-stick material applied over the intermediate surface to form an abrasion resistant nonstick surface characterised by applying a ground coat of vitreous enamel having a surface roughness of 7.5 - 15 micro meter finish at a sinter temperature of 600"C - 700"C to a base substrate flame spraying onto the ground coat surface a matrix layer of stainless steel or molybdenum and allowing to cool, spraying a resin based or aqueous based primerto the stainless steel or molybdenum layer, air or oven drying and again allowing to cool, and finally spraying on a polytetrafluoroethylene (PTFE) or tetrafluoroethylene-polyhexafl uoropropylene (TFE/
HFP) based top coat and storing at a temperature of 200"C - 450"C for 20 - 30 minutes.
2. A method of coating laminated surfaces as in claim 1,characterised in that the stainless steel or molybdenum layer is air or oven dried at 120"C 150 C.
3. A laminated surface when produced by the method of claims 1 - 2 characterised by a base substrate coated with a layer of vitreous enamel having a surface roughness of 7.5 - 15 micro mm finish, a matrix layer of stainless steel or molybdenum over the vitreous enamel layer and finally a
PTFE orTFE/HFP outer coating layer over the matrix layer.
4. A vessel formed of a material produced by the method referred to in claims 1 - 3 comprising a ferrous base substrate, a ground layer of vitreous enamel ceramic on the base substrate, a stainless steel or molybdenum layer overlying the ceramic layer on the opposite side of the enamel layer from the ferrous substrate and a PTFE or TFE/HFP top or non-stick outer surface overlying the stainless steel or molybdenum layer and impregnated therein.
5. A vessel as in claim 4 in which the stainless steel or molybdenum layer forms an intermediate surface having microscopic prominences and interstices to receive the PTFE or TFE/HFP outer surface.
6. A vessel as in claims 4 or 5 substantially with reference to the accompanying drawings.
7. A method of coating laminated surfaces to render them abrasive resistant substantially as hereinbefore described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08233861A GB2111861B (en) | 1981-12-22 | 1982-11-26 | Improvements in methods of coating surfaces to render them abrasion resistant |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8138633 | 1981-12-22 | ||
| GB08233861A GB2111861B (en) | 1981-12-22 | 1982-11-26 | Improvements in methods of coating surfaces to render them abrasion resistant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2111861A true GB2111861A (en) | 1983-07-13 |
| GB2111861B GB2111861B (en) | 1985-05-01 |
Family
ID=26281600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08233861A Expired GB2111861B (en) | 1981-12-22 | 1982-11-26 | Improvements in methods of coating surfaces to render them abrasion resistant |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2111861B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2146266A (en) * | 1983-07-15 | 1985-04-17 | American Standard Inc | Multilayer composite structure |
| EP0331155A3 (en) * | 1988-03-02 | 1990-01-31 | Harald Scholl | Process for coating domestic utensils, and such a domestic utensil |
| WO1992022676A1 (en) * | 1991-06-11 | 1992-12-23 | Sprayforming Developments Limited | Protection of metal surfaces against corrosion |
| WO2000013807A1 (en) * | 1998-09-08 | 2000-03-16 | Impreglon International L.L.C. | Surface coating for a substrate and method for producing such a coating |
| EP0989199A1 (en) * | 1998-08-28 | 2000-03-29 | Pyrolux A/S | A method for coating kitchen utensils |
| US6123999A (en) * | 1997-03-21 | 2000-09-26 | E. I. Du Pont De Nemours And Company | Wear resistant non-stick resin coated substrates |
| CN105780001A (en) * | 2014-12-19 | 2016-07-20 | 佛山市顺德区美的电热电器制造有限公司 | Manufacturing method for pot and pot |
| EP3492621A1 (en) * | 2017-11-29 | 2019-06-05 | Airbus Operations SAS | Method for improving the wear resistance properties of a mechanical part |
-
1982
- 1982-11-26 GB GB08233861A patent/GB2111861B/en not_active Expired
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2146266A (en) * | 1983-07-15 | 1985-04-17 | American Standard Inc | Multilayer composite structure |
| EP0331155A3 (en) * | 1988-03-02 | 1990-01-31 | Harald Scholl | Process for coating domestic utensils, and such a domestic utensil |
| WO1992022676A1 (en) * | 1991-06-11 | 1992-12-23 | Sprayforming Developments Limited | Protection of metal surfaces against corrosion |
| US6123999A (en) * | 1997-03-21 | 2000-09-26 | E. I. Du Pont De Nemours And Company | Wear resistant non-stick resin coated substrates |
| EP0989199A1 (en) * | 1998-08-28 | 2000-03-29 | Pyrolux A/S | A method for coating kitchen utensils |
| WO2000013807A1 (en) * | 1998-09-08 | 2000-03-16 | Impreglon International L.L.C. | Surface coating for a substrate and method for producing such a coating |
| CN105780001A (en) * | 2014-12-19 | 2016-07-20 | 佛山市顺德区美的电热电器制造有限公司 | Manufacturing method for pot and pot |
| EP3492621A1 (en) * | 2017-11-29 | 2019-06-05 | Airbus Operations SAS | Method for improving the wear resistance properties of a mechanical part |
| CN110004400A (en) * | 2017-11-29 | 2019-07-12 | 空中客车运营简化股份公司 | For improving the method and component of the wear-resisting property of component |
| CN110004400B (en) * | 2017-11-29 | 2025-03-25 | 空中客车运营简化股份公司 | Method for improving the wear resistance of a component and component |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2111861B (en) | 1985-05-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19921126 |