Synthesis and oxidation behavior of (Mo0.97Nb0.03)(Si0.97Al0.03)2 ceramic. Issue 5 (1st April 2018) - Zhu, Gaoming
Abstract: (Mo0.97 Nb0.03 )(Si0.97 Al0.03 )2 ceramic was synthesized by self-propagating high-temperature synthesis using commercial elemental powders, and then dense monolithic ceramic was prepared via vacuum hot pressing. The oxidation behavior of the bulk ceramic was investigated at 500 °C and 1200 °C. At 500 °C, due to the preferential oxidation of Nb-rich phase and the formation of uniform oxidation layer, the oxidation rate of (Mo0.97 Nb0.03 )(Si0.97 Al0.03 )2 is lower than pure MoSi2 . At 1200 °C, (Mo0.97 Nb0.03 )(Si0.97 Al0.03 )2 shows better oxidation resistance than MoSi2, owing to the uniform complex oxide layer with SiO2, Al2 O3 and Nb2 O5 formed on the surface of the prepared ceramic.