CARBOTHERMAL SYNTHESIS OF ALUMINUM OXYNITRIDE (ALON) POWDER - INFLUENCE OF STARTING MATERIALS AND SYNTHESIS PARAMETERS

被引:82
|
作者
ZHENG, J
FORSLUND, B
机构
[1] Department of Inorganic Chemistry, Arrhenius Laboratory, University of Stockholm
关键词
D O I
10.1016/0955-2219(95)00078-9
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Carbothermal synthesis of cubic aluminium oxynitride (ALON) have been performed in a graphite furnace at different temperatures (1700-1860 degrees C) and pressures (0.1-10 MPa). The products were characterized by XRD, SEM and elemental analyses, and the overall compositions were determined by reoxidation in air. The control of excess nitridation was a crucial task in the preparation of ALON. A two-step procedure, first annealing at about 1550 degrees C then at about 1800 degrees C, tvas found to be effective to this end. CO additions to the N-2 gas stimulated ALON formation, but a pressure increase resulted in a lower nitridation rate. The particle size and morphology of ALON depended on mw material type and synthesis parameters such as temperature program, pressure, CO content in the N-2 gas, and sample compartment type. Thermodynamic calculations in the Al-O-C-N system have been performed in order to explain the experimental results.
引用
收藏
页码:1087 / 1100
页数:14
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