초미세 결정립을 가지는 몰리브덴의 제조 및 기계적 특성

초록

Mo nanopowder was synthesized by ball-milling and subsequent hydrogen-reduction of MoO3powder. To fabricate ultra fine grained molybdenum, two-step sintering and spark plasma sintering process were employed. The grain size of specimen by two-step sintering and spark plasma sintering was around 0.6μm and 0.4 μm, respectively. Mechanical properties of ultra fine grained Mo with relative density of above 90% were significantly improved at room and high temperatures comparing to commercial bulk Mo of 99%relative density. This result was mainly explained by the grain size refinement due to diffusion-controlled sintering.

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