방전 플라즈마 소결에 의한 Distaloy AE-TiC 써멧의 치밀화 특성

Abstract

The fabrication of Fe alloy-40wt.%TiC composite materials using spark plasma sintering process after ball-milling was studied. Raw powders to fabricate Fe alloy-TiC composite were Fe alloy, TiH2 and activated carbon. Fe alloy powder was Distaloy AE (4%Ni-1%Cu-0.5%Mo-0.01%C-bal.%Fe) made by Hoeganes company with better toughness and lower melting point. These powders were ball-milled in horizontal attrition ball mill at a ball-to-powder weight ratio of 30 : 1. After that, these mixture powders were sintered by using spark plasma sintering apparatus for 5 min at 1200-1275℃ in vacuum atmosphere under 10-3 torr. Distaloy AE-40 wt.%TiC composite was directly synthesized by dehydrogenation and carburization reaction during sintering process. The phase transformation of as-milled powders and sintered materials was confirmed using X-ray diffraction (XRD) and transmission electron microscope (TEM). The density and harness materials was measured in order to confirm the densification behavior. In case of Distaloy AE-40 wt.%TiC composite retained for 5 min at 1275℃, it has the relative density of about 96% through the influence of rapid densification and fine TiC particle reinforced Fe-based composites materials.