Method of coating metal carbide nitride, and carbonitride whiske

Details Method of coating metal carbide nitride, and carbonitride whiske Method of coating metal carbide nitride, and carbonitride whiske

1986-08-25

1989-03-07

Childs, Sadie

Coating processes

Particles, flakes, or granules coated or encapsulated

Inorganic base

427249, 427255, 4272552, 4272553, 4272557, 4274192, 4274197, B05D 700, C23C 1632

Patent

active

048105309

ABSTRACT:
A method for coating single crystal whiskers of carbides, nitrides or carbonitrides of Ti, Zr, Hf, V, Nb, Ta, or W with one or more layers of a carbide, nitride or carbonitride of Ti, Zr, Hf, Nb, Ta, or W, or oxides of Al, Zr, or Hf. The method involves flowing past the whiskers at about 1025.degree.-1125.degree. C. a mixture of hydrogen and one of the following gaseous mixtures: Group I comprises one or more of Ti, Zr, Hf, Nb, Ta, or W hhalides mixed with one or more of N.sub.2, NH.sub.3, or suitable free carbon forming aliphatic hydrocarbons. The atomic ratio of carbon and/or nitrogen to metal is about 5:1-16:1, and the volume ratio of hydrocarbon and/or N.sub.2 and/or NH.sub.3 to H.sub.2 is about 1:5 to 1:20. Group II comprises one or more Al, Zr, or Hf halides mixed with one or more suitable oxygen donor gases, in proportions selected to form the desired metal oxide.

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