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MCP로 제조된 황화물 첨가에 의한 분말소결재료의 가공특성
배승열(Sung Yeal Bae),안인섭(In Shup Ahn),조권구(Kwon Koo Cho),김기원(Ki Won Kim),박동규(Dong Kyu Park) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
Metal sulfide(MeS)is well-known and widely used an additive for enhancing machinability, but the problems is extremely sensitive to reaction with moisture and thermal decomposition during sintering. In this study, micron or nano size compound powders of FeS were produced by mechano-chemical process. The machinability was also evaluated at the metal sulfide added sintered steel. Compared with the MnS additive, addition of the FeS powders to the iron resulted the formation of the sintering materials containing a spherical shape of pore, partly remained FeS rich-phase in iron matrix. Relative machinability behavior of sintering materials was investigated by the lathe manufacturing. Mechanical properties of sintering material with 1.2%FeS powders were improved rather than its using MnS powders.
Titanium hydride를 이용한 TiC분말의 제조 및 특성
성택경,안인섭,배승열,정우현,박동규,정광철,김유영,Sung Tek Kyoung,Ahn In-Shup,Bae Sung-Yeal,Jeong Woo Hyun,Park Dong-Kyu,Jung Kwang Chul,Kim You-Young 한국분말야금학회 2005 한국분말재료학회지 (KPMI) Vol.12 No.3
This paper deals with the fabrication of titanium carbide using fine titanium hydride. The ratio of $TiH_2$ and C (Activated carbon) was 1:1 (mol) and milled in a planetary ball mill at a ball-to-powder weight ratio of 20:1. Thereafter, TGA was performed at $1400^{\circ}C$ to observe change of weight with milling time. Titanium carbide was obtained by using tempering the milled powders at $1100-1500^{\circ}C$. The microstructures of titanium carbide as well as the change of the lattice parameters and particle size have been studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM).
ZnS 형광체 분말제조를 위한 기계적합금화법의 응용 연구
안인섭,정우현,배승열,성택경,박동규,Ahn In-Shup,Chong Woo-Hyun,Bae Sung-Yeal,Sung Tek-Kyoung,Park Dong-Kyu 한국분말야금학회 2005 한국분말재료학회지 (KPMI) Vol.12 No.4
In this study, the ZnS composite powders for host material in phosphor was synthesized in situ by mechanical alloying. As the mechanical alloying time increases, particle size of ZnS decreases. ZnS powders of $1.85\;\mu{m}$ in a mean size was fabricated by mechanical alloying for 10h. The crystal structures of ZnS powders were investigated by X-ray diffraction and the photo-luminescence properties was evaluated with the optical spectra analyzer. The steady state condition of mechanically alloyed ZnS was obtained as a mean particle size of $2\;\mu{m}$ in 5h milling. The sphalerite and wurtize structures coexist in the ZnS mechanically alloyed for 5h. The ZnS powder mechanically alloyed for 10h grows to the sphalerite structure. And the strong emission peaks of ZnS are observed at 480 nm wave length at the powders of mechanically alloyed for 10h, but the sphalerite and wurtize structures in ZnS coexist and emission peaks are not appeared at the powders of mechanically alloyed for 10h.