Coating processes – Heat decomposition of applied coating or base material – Coating decomposed to form carbide or coating carbonized
Patent
1994-09-23
1996-07-09
Bell, Janyce
Coating processes
Heat decomposition of applied coating or base material
Coating decomposed to form carbide or coating carbonized
427294, 4273761, 427377, 427399, B05D 302
Patent
active
055342930
ABSTRACT:
A method for treating surfaces of carbon based materials produces a layer of hafnium carbide with no significant change of the location of the surface or the dimension of the part being treated. A slurry containing elemental hafnium is applied to this surface. The surface is heat treated in a vacuum furnace, causing the hafnium in the slurry to form an HfC layer within the material, and remove all other slurry materials from the surface. In a variation of the method, the slurry may also contain silicon and chromium to catalyze the reaction. The treated surface exhibits improved properties for components of high temperature gas flow handling systems. The method is useful for valves and ducts having complex internal surface geometries.
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Hu, H. S. Joshi, A. and Lee, J. S. "Micro-sturctural Evaluations of a Si-Hf-Cr Fused Slurry Coating on Graphite for Oxidation Protection", Journal of Vacuum Science & Technology, Feb. 1991.
Kaplan, Richard B. and Tuffias, Robert H., "High Temperature Composite Structures Are Fabricated With Deposition Process," Research & Development, Feb. 1989, pp. 118-120.
Bell Janyce
Karambelas Anthony W.
Loral Aerospace Corp.
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