Stock material or miscellaneous articles – Hollow or container type article – Glass – ceramic – or sintered – fused – fired – or calcined metal...
Patent
1988-03-03
1990-10-16
Seidleck, James
Stock material or miscellaneous articles
Hollow or container type article
Glass, ceramic, or sintered, fused, fired, or calcined metal...
29132, 101348, 427 34, 427 531, 428 359, B41N 700, C23C 2800
Patent
active
049634046
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process for the production of a coated product, in which a metal-comprising adhesion layer and a ceramic-fluorocarbon polymer-comprising coating are applied to said product by means of plasma spraying.
Such a process is known from U.S. Pat. No. 4,566,938.
The above-mentioned patent describes the application to a roller of an adhesion layer in the form of a mixture of a metal and a fluorocarbon polymer, followed by the application of a ceramic-fluorocarbon polymer-comprising coating. Such a known process has the disadvantage that it can be used only for the coating of rigid products which are not mechanically deformable in normal circumstances. If such a process is used for the coating of a flexible product, adhesion problems between the coating system and the substrate occur during use, which can lead to cracking of the coating layers and even to partial peeling thereof.
The object of the present invention is to produce a solution to the above problem, so that the process can be used for coating flexible products without the coatings applied cracking or peeling during normal use of the coated flexible product.
The process is to that end according to the invention characterized in that an adhesion layer consisting entirely of metal is applied between the surface of the product to be coated and the ceramic-fluorocarbon polymer-comprising coating.
It was surprisingly found that the deformation stability of the ceramic-fluorocarbon polymer-comprising coating increases very considerably if an adhesion layer made entirely of metal is used, unlike the use of an adhesion layer consisting of a mixture of fluorocarbon polymer and metal specified in the above-mentioned U.S. Pat. No. 4,566,938. This greatly improved stability is particularly evident on deformation of the substrate to which the adhesion layer and the ceramic-fluorocarbon polymer-comprising coating have been applied. With normal elastic deformation of the substrate, cracking and possibly peeling no longer occur.
In particular, the process according to the present invention is characterized in that the metal adhesion layer is formed using at least two metals reacting with each other exothermally under plasma spraying conditions.
In that case the adhesion layer expediently consists of a nickel-titanium alloy.
Another very useful adhesion layer is formed by a nickel-aluminium alloy.
In such a nickel-titanium and nickel aluminium adhesion layer the molecular ratio nickel:titatiun or nickel:aluminium is advantageously between 30:70 and 70:30 respectively.
The ceramic constituent of the ceramic-fluorocarbon polymer-comprising coating in the process according to the invention is very advantageously selected from amorphous metal oxides, metal carbides, metal nitrides and metal silicides or mixtures of such substances.
On account of the mechanical properties of the ceramic-fluorocarbon polymer-comprising coating, it has been found advantageous to use amorphous starting materials for the ceramic constituent. It was found that the elasticity of the coating increased particularly if, instead of a crystalline ceramic material, an amorphous ceramic material was used. It was also found that the amorphous nature of the starting materials was retained during the plasma spraying treatment and any further treatments.
In a particular embodiment of the process according to the invention the product to be coated is made of metal between 10 and 1000 .mu.m thick, on which first by plasma spraying a Ni/Ti adhesion layer is formed with 50 mol.-% Ni and 50 mol.-% Ti and between 25 and 500 .mu.m thick, followed by a coating consisting of a thorough mixture of metal, ceramic and fluorocarbon polymer between 75 and 800 .mu.m thick, in which the metal consists of a Ni/Ti alloy with 50 mol.-% Ni and 50 mol.-% Ti, the ceramic part consists of 1-80 wt.-% amorphous titanium dioxide and 99-20 wt.-% amorphous aluminium oxide, and the composition over the thickness of the coating starting from the adhesion coating or first coating varies from 85-0% metal and 10-95
REFERENCES:
patent: 4027367 (1977-06-01), Rondeau
patent: 4246842 (1981-01-01), Williams et al.
patent: 4566938 (1986-01-01), Jenkins
Seidleck James
Stork Screens B.V.
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