B_4CとTi粉体間の固相反応によるTiB_2-TiC複合体の合成

概要

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The mechanism of solid-state reaction between B_4C and Ti powders has been examined in the temperature range between 1000°C and 1300°C. In the early stage of the reaction, TiB and nonstoichiometric TiC_<0.58> in equilibrium with C-saturated Ti were formed from B_4C and Ti ; then TiB_2 and TiC_x containirlg higher amounts of C were formed from TiB, TiC_<0.58> and remaining B_4C until the reaction ceased at an x-value of 0.69. This reaction path was not changed basically in the temperature range examined although the reaction rate was increased with temperature. Every product grain consisted of a TiC_x core and a TiB_2 layer around the core. This suggests that B hardly migrates in products and the reaction proceeds mainly by inward C diffusion and outward Ti diffusion through the products.
社団法人日本セラミックス協会の論文
1999-11-01