SiO_2-Al-C-N_2系反応生成物に及ぼす原料SiO_2の種類, 焼成温度と添加物の影響

概要

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Natural quartz , synthetic quartz, quartz glass, blue sili ca gel, white silica gel and cristobalite were heated with AI and pitch coke at temperatures from 873 to 2073 K in nitrogen gas atmosphere. Effect of the Si0_2 type and addition of CoCl_2, Co, Fe and Ni on the reac tion products was investigated. At 1673 and 1873 K, the reaction products depended on the SiO_2 type. Judg ing frorn the reaction products at 1873 K, the SiO_2 was classified into two groups. AlN was formed in the first group that consisted of natural quartz, synthetic quartz and quartz glass. However, AlN was not formed in the second group that consisted of blue silica gel, white silica gel and cristobalite. P sialon was formed only from blue silica gel. On the other hand, p SiC was formed from all the Si0_2 except blue silica gel. At 2073 K, the reaction products were AlN・Al_2O_3 (spineD and AlN irrespective of the SiO_2 type. CoCl_2, Co, Fe and Ni acted as a catalyst for P sialon formation and Fe was the best catalyst. In the presence of additives, amorphous white silica gel was better source for β-sialon formation than synthetic quartz and cristobalite.
社団法人日本セラミックス協会の論文
1994-07-01