素粉末をミリングした75vol%WC-FeAl混合粉末のパルス通電焼結における結合相の変化

概要

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75vol%WC-FeAl (Fe-40at%Al) mixture has been prepared by milling of WC, Fe, Al and graphite powders for 3.6ks using a planetary ball milling. The reaction between Fe and Al in the mixture during heating has been examined by DTA. The mixture has shown an exothermic reaction starting at 1163K after Al was melted.The obtained mixture has been consolidated using pulsed-current sintering at 1223-1423K. The sintered compact at 1223K has had Fe peaks in the X-ray diffraction pattern and had magnetization. The exothermic reaction at 1163K in the DTA curve has been a combustion synthesis of various Fe-Al intermetallic compounds from molten Al and Fe. The 75vol%WC-FeAl sintered compact has been densified according to a sintering temperature with solid phase diffusion and increased FeAl content in the binder phase. The 75vol%WC-FeAl sample sintered at 1423K has had non-magnetization and Vickers hardness of 1470Hv.
社団法人粉体粉末冶金協会の論文