<総説>メカノケミカル反応場の協奏増幅による非酸化物系セラミックス合成プロセス

概要

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Much attention has been paid to synthesis of inorganic compounds by a material processing utilizing various kinds of concerted amplification. The author review mechanochemical process as one of the physical methods which activate the chemical reaction. Carbides, silicides, nitrides and borides were recently synthesized by ball-milling of the elemental powder mixtures without external heat application. The mechanochemical syntheses of these compounds can be divided into ; (1) direct formation of the compounds by instantaneous reaction in case of TiC, TiB_2, MoSi_2, ZrSi_2, Ti_5Si_3, etc. ; or, (2) formation of fine powder mixture by which diffusion process is promoted, followed by annealing at relatively low temperature in case of CrB_2, CrSi_2, WSi_2, SiC, etc. The exothermic nature of the reaction system determines the reaction route for the formation of a compound. Mechanochemical synthesis of nitrides were also reported for TiN,BN, Si_3N_4,β-C_3N_4, etc. Furthermore, the mechanochemical synthesis of the high melting compounds such as WC,TiB_2 and TiC by the reducion of oxides have been examined.
東京工芸大学の論文
2001-01-31