What about if use plasma spray process for TaC coating on graphite ?
Pure carbides (WC, Cr3C2, TaC, TiC, SiC, B4C and others) can not be applied by thermal spraying. Only the mixtures of such carbides with soft metal, for example WC-Co or Cr3C2-NiCr, can be sprayed on metallic substrates by means of HVOF or plasma spraying.
Thank you very much for all the responses. Can I use silicon carbide as bond coat?
Coating graphite by thermal spraying is next to impossible. There have been several attempts to protect graphite against oxidation and wear by various spray coatings, but all this remained in the labs.
Theoretically, you can apply to a siliconized graphite surface something with a very low coefficient of thermal expansion, but in practice it is hard to realize. Other methods, primarily CVD, are much more promising for graphite coating than thermal spraying.
Thank you very much. But can I achieve higher thickness say 100 microns, from CVD ?
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