Posted by Bill Ferree on January 21, 2004 at 16:54:50:
In Reply to: Re: Material Suitability posted by John Carleton on August 29, 2003 at 09:57:06:
: Gordon,
: It is a pure TiCl4 gas. The purpose of the coating is to reduce wear on Inconol components. There appears to be what looks like cavitational wear, as really there are no abrasive elements going through. I have extended the life of the component but what is strange is that you would expect to see coating in less aggressive areas. On a whole the coating has disappeared. This to me indicates a possible corrosive element to the problem.
: You mention that TiCl4 is corrosive in gas form, corrosive to what? If its nickel then I agree that Wc/Ni would be no better. Uhmmm!!!! Perhaps Aly oxide might be the way to go.
: Interesting problem, I'll do some more digging into the matter
: Many thanks for replying
: John
John - This appears to be an application for ceramic (Chrome Oxide )over a bond coat of tantalum. We don't like the inherent porosity of plasma spray, but some compromises may have to be made. There are excellant sealers to address the porosity problem that are impervious to HCL.
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