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AlON phase formation in hot-pressing sintering Al2O3/AlN composites and their oxidation behavior

Shifeng Huang,Feng Gao,Qinggang Li,Xin Cheng

Samples with various ratios of AlN/Al 2 O 3 were fabricated via vacuum hot-pressing at 1700 °C under an applied pressure of 30 MPa for 90 min using Y 2 O 3 as a sintering aid. The densification process, microstructural development, and formation of AlON phase from Al 2 O 3 and AlN were investigated. Al 2 O 3 additive can improve the physical and mechanical properties , and purification of the grain boundaries. AlON are almost formed completely when the content of Al 2 O 3 is 80 vol%. The effects of composition, microstructure, and exposure time at 1400 °C on the oxidation behavior of AlN samples with different amounts of Al 2 O 3 were investigated. The sample with 80 vol% alumina has the best oxidation resistance .