Composite coatings

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C - Chemistry, Metallurgy

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C23C 16/30 (2006.01) B23B 27/14 (2006.01) C04B 41/50 (2006.01) C04B 41/52 (2006.01) C04B 41/87 (2006.01) C04B 41/89 (2006.01) C23C 16/40 (2006.01) C23C 30/00 (2006.01)

Patent

CA 1328580

COMPOSITE COATINGS Abstract A wear resistant article, such as a cutting tool. A cemented carbide or hard ceramic substrate is coated with a composite ceramic coating having at least two phases. The first phase is a continuous oxide matrix layer 0.1-20 microns thick of oxides of alumina, zirconia, or yttria. At least one discontinuous second or additional phase of oxides of aluminum, zirconium, or yttrium, or solid solutions thereof, is dispersed as discrete particles within the matrix layer. The additional phase material is different from the matrix material.

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