S0401-2-1 その場生成により作成したWC超硬合金の特性と結合相の関係(粉末成形とその評価(2))

概要

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The synthesis of WC alloy from elemental powders during the solid-phase sintering was investigated. Co and FeAl was chosen as a binder phase. The chemical composition of WC alloy was decided to have 10 or 20vol% binder. The powder mixtures of elemental powders were mechanical alloyed by using low-energy ball mill under an Ar atmosphere. After 1800ks milling, the X-ray diffraction profile showed only elemental W phase. At DTA runs of WC-Co composition MA powders, W_2C phase formed first then it transfered to WC with increasing temperature. On the other hand, in the case of WC-FeAl composition MA powder, objective FeAl phase was not obtained under solid-phase sintering up to 1373K. The compact consisted of WC-Fe_3W_3C. The densification behavior was influenced by phase formation phenomena. Densification was accelerated just before carbide formation, then it was restrained by the in-situ formation of hard carbide particle.
一般社団法人日本機械学会の論文
2009-09-12