Patent ID: 6503442
Filing Date: 2003-01-07
Classification: C21C,C23C,F27D,Y10T

Abstract:
A coated device for use with corrosive environments at high temperatures, the device comprising a bond coat, the bond coat having a composition consisting essentially of, by weight percent, about 0 to 5 carbon, about 20 to 40 chromium, about 0 to 5 nickel, about 0 to 5 iron, about 2 to 25 total molybdenum plus tungsten, about 0 to 3 silicon, about 0 to 3 boron and balance cobalt and essential impurities for sulfidation resistance at high temperatures; a zirconia-base ceramic coating having an interlocking lamellar structure formed from powder particles covering the bond coat for heat resistance; and a boride or a carbide top layer covering the zirconia-base ceramic coating.