Oxidation resistant, high temperature thermal cycling...

C - Chemistry – Metallurgy – 04 – B

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117/128, 117/81

C04B 41/89 (2006.01) C04B 41/52 (2006.01) C23C 16/30 (2006.01) C23C 16/40 (2006.01)

Patent

CA 1333763

An oxidation resistant, high temperature thermal cycling resistant coated ceramic article for ceramic heat engine applications. The substrate is a silicon-based material, i.e. a silicon nitride- or silicon carbide- based monolithic or composite material. The coating is a graded coating of at least two layers: an intermediate AlN or AlxNyOz layer and an aluminum oxide or zirconium oxide outer layer. The composition of the coating changes gradually from that of the substrate to that of the AlN or AlxNyOz layer and further to the composition of the aluminum oxide or zirconium oxide outer layer. Other layers may be deposited over the aluminum oxide layer. A CVD process for depositing the graded coating on the substrate is also disclosed.

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