Coating processes – Particles – flakes – or granules coated or encapsulated – Inorganic base
Patent
1987-06-11
1993-11-09
Walsh, Donald P.
Coating processes
Particles, flakes, or granules coated or encapsulated
Inorganic base
427219, 427249, 427255, 427299, 4274192, B05D 700
Patent
active
052600963
ABSTRACT:
A structural article for high temperature applications comprises a body formed of at least partially consolidated, particulate silicon nitride, a conformal outer coating of silicon nitride or silicon carbide on the body, and a conformal intermediate layer of a silicon, oxygen and nitrogen-containing compound, i.e. silicon oxynitride, chemically bonded to both the body and the outer coating. The method for making such an article comprises providing a body formed of at least partially consolidated, particulate silicon nitride, oxidizing the surface of the body, removing silicon dioxide from the oxidized surface of the body; and chemically vapor depositing a conformal outer coating of silicon nitride or silicon carbide. The conformal outer coating provides a protective envelope around and assists in high temperature isostatic pressing of the body and hence permits one to use the structural article in isostatic pressing processes.
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DeKay Yvonne R.
Dyer Paul N.
Holzl Robert A.
Magnotta Vincent L.
Tressler Richard E.
Air Products and Chemicals Inc.
Carroll Chrisman D.
Gourley Keith D.
Marsh William F.
Simmons James C.
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