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자기펄스 압축성형법에 의한 다이아몬드 공구용 세그먼트 분말 성형
윤종수,이정구,이민구,이창규,박문석,홍순직,Yun, J.S.,Lee, J.G.,Lee, M.K.,Rhee, C.K.,Park, M.S.,Hong, S.J. 한국분말야금학회 2008 한국분말재료학회지 (KPMI) Vol.15 No.5
This article presents the successful consolidation of the mixed Co and Diamond powders for a drilling segment by the combined application of magnetic pulsed compaction (MPC) and subsequent sintering, and their properties were analyzed. Homogeneous hardness (Hv 220) and density (97%) of sintered bulks fabricated by MPC were obtained by the new technique, where higher pressure has been employed for short period of time than that of general process. A fine microstructure and homogeneous hardness in the consolidated bulk were observed without cracks. Relatively higher drilling speed of 9.61 cm/min and life time of 6.55 m were found to the MPCed specimens, whereas the value of the specimens fabricated by general process was 11.71 cm/min and 7.96 m, respectively. A substantial improvement of mechanical properties of segment was achieved through this study.