Coating processes – Coating by vapor – gas – or smoke – Base includes an inorganic compound containing silicon or...
Patent
1996-09-25
1998-10-27
Beck, Shrive
Coating processes
Coating by vapor, gas, or smoke
Base includes an inorganic compound containing silicon or...
4272553, 4272557, C23C 1640
Patent
active
058275703
ABSTRACT:
A cemented carbide or ceramic substrate has a wear-resistant composite ceramic coating comprising a doped two-phase metal oxide layer comprising a fully dense, adherent, continuous metal oxide phase and a fully dense, adherent, discontinuous metal oxide phase. The continuous metal oxide phase comprises aluminum oxide, yttrium oxide, or zirconium oxide, and the discontinuous metal oxide phase comprises a dispersed, discrete second phase of aluminum oxide, yttrium oxide, or zirconium oxide, with the continuous metal oxide phase being of a different metal oxide from that of the discontinuous metal oxide phase. The continuous metal oxide phase, and/or the discontinuous metal oxide phase, contains a dopant comprising at least one member selected from the group consisting of sulfur, selenium, tellurium, phosphorus, arsenic, antimony, and bismuth. The wear-resistant composite ceramic coating is deposited on a cemented carbide or ceramic substrate by passing a first metal halide gas, a volatile oxidizing gas, a second metal halide gas, a carrier gas, and a dopant, over the substrate at a temperature of from about 700.degree. to 1250.degree. C., and at a pressure of from about 1 torr to ambient pressure, so that the continuous and discontinuous metal oxide phases are deposited on the substrate.
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Beck Shrive
Cameron Mary K.
Meeks Timothy
Valenite Inc.
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