Posted by Hong-Wei Wang (126.96.36.199) on 15:42:16 06/05/05
In Reply to: Re: insulating spray coating of stainless steel posted by J. Wu
: What I need is just a thin insulating film coated on the surface of stainless steel. The dielectric constant of the insulating material should be as small as possible. If I can just use a spray can to do it it would be perfect.
Thermal spray generally is limited to producing thick coatings, the minimum being inthe region of 25-50 um. There's virtually no limit to the kind of materials that can be sprayed, including elctrically insulating materials, such as alumina and zirconia.
If you are looking for a thin film, the thickness being generally regarded as being less than 5 um, I don't think TS is an option. This is also because of the much higher surface roughness of TS coatings as-sprayed.
With limit, TS can produce thinner "thick" coatings such as LPPS YSZ for making SOFCs - again, the coating in this case is still thicker and less favoured than those by PVD methods.
For this reason, those solution-based (sol-gel, electrophoretic deposition, etc) or vapour-based deposition mehtods are clearly advantageous.
Hong-Wei Wang, ERA Technology Ltd.
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