Oxidation Behavior of Magnesium Aluminum Oxynitride with Different Composition

Abstract

Oxidation behavior of spark plasma sintered (SPS) magnesium aluminum oxynitride (MgAlON) with different composition was investigated in present work. Results showed that the variation in composition had not obvious effect on the density of MgAlON, but had some effect on excess weight change. Also found that the oxidation behavior of MgAlON was different with oxidation temperature, which was attributed to the transformation from γ-Al₂O₃ to α-Al₂O₃. Moreover, the excess weight change was ascribed to the existence of lots of vacancies in γ-Al₂O₃ and magnesium aluminate spinel (MgAl₂O₄ss).