Si・TiC混合粉末成形体の窒素中での焼結性

概要

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The sintering property of powder mixture compacts of TiC and Si in a nitrogen atmosphere at 1350℃ is discussed. TiC formed TiN and free carbon on reaction with nitrogen, and a small portion of this free carbon was converted into β-SiC on reaction with Si. A large portion of the Si formed Si_3N_4 on reaction with nitrogen. Approximately half of he TiC remained unreacted when heated for 10th at the final sintering temperature of 1350℃. Thus, composite ceramics having a composition of TiC・TiN・Si_3N_4・C・β-SiC were obtained. The porosity of this composite was much smaller than that of ordinary Si_3N_4 bonded ceramics because of the volume increase caused by the conversion of Si to Si_3N_4 and additionally of TiC to TiN, C and β-SiC. Carbon, in particular, seemed to have a remarkable effect on reducing the number of pores in the sintered body. The sample dimensions increased in the sintering stage partly because TiC particles formed porous clusters of TiN by reacting with nitrogen.
社団法人日本セラミックス協会の論文
1991-08-01