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Mechanism and thermodynamics of carbothermal reduction of alumina

LIU Xin-kuan~1, MA Ming-liang~2, XI Sheng-qi~2, ZHOU Jing-en~2, WANG Qu-dong~1, DING Wen-jiang~1 (1. State Key Laboratory of Metal Matrix Composite, Shanghai Jiaotong University, Shanghai 200030, P.R.China; 2. School of Materials Science and  
The aluminum nitride synthesized by mechano-chemical activation from carbothermal reduction(CTR) of alumina was investigated. Based on the experimental results, a new mechanism of CTR was proposed that AlON phase is formed at the early stage by the nitridation of Al_2O_3, and the conversion of AlON to AlN proceeds stepwise, via the CTR of AlON. The equilibrium temperature of CTR calculated from thermodynamics approached to the AlN formation temperature from experimental results, which can explain the AlN formation temperature decreases in the mechano-chemical activation synthesis.
【CateGory Index】: TQ174
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