Preparation and Properties of Spark Plasma Sintered Magnesium Aluminum Oxynitride

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  • DAI Wenbin
    Okayama Ceramics Research Foundation School of Materials and Metallurgy, Northeastern University
  • YAMAGUCHI Akira
    Okayama Ceramics Research Foundation
  • LIN Wei
    Okayama Ceramics Research Foundation
  • OMMYOJI Junji
    Okayama Ceramics Research Foundation
  • YU Jingkun
    School of Materials and Metallurgy, Northeastern University
  • ZOU Zongshu
    School of Materials and Metallurgy, Northeastern University

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In this paper, the effects of heating temperature and soaking time on the synthesis of magnesium aluminum oxynitride (MgAlON) by spark plasma sintering (SPS) were investigated. Results showed that the content of N decreased while that of O increased with the increasing of temperature, because of the reaction between Mg3N2 and H2O when the sample heated below 1500°C. Owing to the rapid warming up rate and the reaction between graphite and H2O, the variation of chemical composition was lowered in the sample heated at higher temperature. During the heating process, shrinkage started above 1000°C and expansion was observed above 1600°C. Moreover, open pores were not detected in the sample heated at 1500°C for 1 min and single phase MgAlON without pores could be obtained when heated at 1700°C for 10 min. With the increasing of the content of Mg and the decreasing of N, all the thermal characteristics were increased and the cold bending strength was decreased, which may provide a standard data about the cold bending strength and the thermal characteristics of MgAlON with different composition.<br>

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