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 PDF

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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
Application number
GB08233861A
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GB2111861B (en
Inventor
Harry Chapman Johnson
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.)
ARMOURCOTE SURFACE TREATMENTS
Original Assignee
ARMOURCOTE SURFACE TREATMENTS
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 ARMOURCOTE SURFACE TREATMENTS filed Critical ARMOURCOTE SURFACE TREATMENTS
Priority to GB08233861A priority Critical patent/GB2111861B/en
Publication of GB2111861A publication Critical patent/GB2111861A/en
Application granted granted Critical
Publication of GB2111861B publication Critical patent/GB2111861B/en
Expired legal-status Critical Current

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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

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  • 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.
GB08233861A 1981-12-22 1982-11-26 Improvements in methods of coating surfaces to render them abrasion resistant Expired GB2111861B (en)

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

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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)

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GB (1) GB2111861B (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2146266A (en) * 1983-07-15 1985-04-17 American Standard Inc Multilayer composite structure
EP0331155A2 (en) * 1988-03-02 1989-09-06 Scholl, Harald 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

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2146266A (en) * 1983-07-15 1985-04-17 American Standard Inc Multilayer composite structure
EP0331155A2 (en) * 1988-03-02 1989-09-06 Scholl, Harald Process for coating domestic utensils, and such a domestic utensil
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

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