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MoS<sub>2</sub> 첨가에 따른 Fe-Cr-Mn-C-V계 소결합금의 기계적 특성 평가
김건홍,양현석,공만식,Kim, Geon-Hong,Yang, Hyun Seok,Kong, Man-Sik 한국분말야금학회 2014 한국분말재료학회지 (KPMI) Vol.21 No.4
The connecting rod is one of the most important parts in automotive engines, transforming the reciprocal motion of a piston generated by internal combustion into the rotational motion of a crankshaft. Recent advances in high performance automobile engines demand corresponding technological breakthroughs in the materials for engine parts. In the present research, the powder metallurgy (P/M) process was used to replace conventional quenching and/or tempering processes for mass production and ultimately for more cost-efficient manufacturing of high strength connecting rods. The development of P/M alloy powder was undertaken not only to achieve the improvement in mechanical properties, but also to enhance the machinability of the P/M processed connecting rods. Specifically $MoS_2$ powders were added as lubricants to non-normalizing Fe-Cr-Mn-V-C alloy powder to improve the post-sintering machinability. The effects of $MoS_2$ addition on the microstructure, mechanical properties, and machining characteristics were investigated.
MoO<sub>3</sub> 침출공정 폐액으로부터 치환반응 시스템을 이용한 구리 분말 회수에 대한 연구
김건홍,홍현선,정항철,Kim, Geon-Hong,Hong, Hyun-Seon,Jung, Hang-Chul 한국분말야금학회 2012 한국분말재료학회지 (KPMI) Vol.19 No.6
Recovery of copper powder from copper chloride solution used in $MoO_3$ leaching process was carried out using a cementation method. Cementation is a simple and economical process, necessitating less energy compared with other recovery methods. Cementation utilizes significant difference in standard reduction potential between copper and iron under standard condition. In the present research, Cementation process variables of temperature, time, and added amount of iron scraps were optimized by using design of experiment method and individual effects on yield and efficiency of copper powder recovery were investigated using bench-scale cementation reaction system. Copper powders thus obtained from cementation process were further characterized using various analytical tools such as XRF, SEM-EDS and laser diffraction and scattering methods. Cementation process necessitated further purification of recovered copper powders and centrifugal separation method was employed, which successfully yielded copper powders of more than 99.65% purity and average $1{\mu}m$ in size.