日本金属学会誌

J. Japan Inst. Metals, Vol. 54, No. 2 (1990),
pp. 181-185

Some Examinations on the Formation of AlN by Simultaneous Reduction-Nitriding of Al2O3

Shinji Hirai1, Tetsuya Miwa2, Tsutomu Iwata3 and Hiroshi G. Katayama1

1Department of Metallurgical Engineering, Muroran Institute of Technology, Muroran
2Undergraduate Student, Muroran Institute of Technology, Muroran. Present address: Riken Co., Ltd., Saitama
3Research Student, Muroran Institute of Technology, Muroran

Abstract:

Experiments were made of the effects of the kind, particle diameter and proportion ratio of raw material, and the addition of various substances on the formation of AIN through carbothermic reduction of Al2O3 in a flowing N2 atmosphere. The results are as follows: (1) The smaller the particle diameter of Al2O3 was, the higher became the reaction rate, but it decreased where the diameter was less than 0.7 μm. (2) When fine carbon black was used instead of graphite, a marked increase in reaction rate was observed. (3) With a pellet made of relatively coarse Al2O3 and graphite, the peuet diameter had little effect on the reaction rate, whereas in the case of fine particle, the rate decreased with the increase of pellet diameter. (4) The higher the proportion of carbon black, the greater became the degree of reaction. (5) When CaCl2, CaCN2, CaC2, CaF2, CaB4O7 and La each were added by 1 mass%, a marked acceleration effect was produced at the initial stage of reaction.


(Received 1989/9/9)

Keywords:

AlN, carbothermic reduction, promotion, particle diameter, proportion ratio, pellet diameter, additives


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