B_4CとTiの反応性放電プラズマ焼結によるTi-B-C系複合体の合成

概要

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B_4C-TiB_2-C and TiB_2-TiC-C composites were synthesized by reactive spark plasma sintering of powder mixtures of Ti and B_4C, accompanied by their solid-state displacement reactions. When varying the mixing ratio of the starting materials Ti and B_4C, x, the following reactions were completed:when 0<x≤2, B_4C+xTi→xTiB_2+(1-x/2)B_4C+(x/2)C and when 2<x≤3, B_4C+xTi→2TiB_2+(x-2)TiC+(3-x)C. Carbon, which was precipitated in the product TiB_2 phases, increased pores and cracks in the TiB_2 phases and resulted in a decrease of the relative density and Young's modulus. For x=3, the composite contained no carbon and had the highest values for both the Young's modulus and fracture toughness. The Young's modulus of the composites prepared was represented by E/GPa=460V_<B_4C>+600V_<TiB_2>+488V_<TiC>-1414V_C, where V_i is the molar volume of component i.
社団法人日本セラミックス協会の論文
2000-08-01