還元窒化法によるAlN粉末合成反応に及ぼすCa化合物添加の影響

概要

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Effect of Ca compound addition on synthesis of AlN powder by carbothermal reduction niiridation method was investigated, in which CaF_2, CaCl_2, CaCO_3, Ca (OH)_2, Ca(CH_3COO)_2 and CaC_2 were selected as addi tives. Each compound promoted the nitridation, and CaF_2 and CaCO_3 were the most excellent reaction promoters achieving full nitridation even at 1300℃. In case of CaF_2 addition, it was estimated that the reduc tion nitridation proceeds through the formation of an intermediate conrpound, CaF_2 5Al_2O_3. In case of other additives, Ca aluminates, CaO xAl_2O_3 (x=1, 2, 6) , were formed as intermediates. The value x in the alurninates was dependent on the chemical species of additives. The grain morphology of synthesized AlN va ried with the species of additives; addition of CaF_2 and CaCl_2 resulted in spherical AlN particles. The reduc tion nitridation behavior of CaO ・Al_2O_3 and CaO 2Al_2O_3 was also investigated. The Ca aluminates changed through the reaction step; CaO ・ 2Al_20_3 CaO Al_20_3→12CaO ・ 7Al_20_3→CaO, finally yielding AlN.
社団法人日本セラミックス協会の論文
1994-07-01