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 AlN 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 pellet 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.
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