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김해곤,김길수,오승탁,석명진,김영도,Kim, Hai-Gon,Kim, Gil-Su,Oh, Sung-Tag,Suk, Myung-Jin,Kim, Young-Do 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.6
The sintering behavior and mechanical property of Mo nanopowder was investigated as a function of various sintering condition. Mo oxide nanopowders were milled using a high energy ball-milling process. After the ball milling for 20h, the crystalline size of $MoO_3$ was about 20 nm. The $MoO_3$ nanopowders were reduced at the temperature of $800^{\circ}C$ without holding time in $H_2$ atmosphere. The sinterability of Mo nanopowder and commercial Mo powder was investigated by dilatometric analysis. Mo nanopowder and commercial Mo powder were sintered at $1200^{\circ}C$ for 1 hand $1500^{\circ}C$ for 3 h, respectively. In both specimens the measured relative density was about 95%. But the measured hardness values were 2.34 GPa for nanopowder and 1.87 GPa for commercial powder. Probably due to finer grain size of the sintered body prepared from Mo nanopowder than that prepared using commercial Mo powder. The mean grain sizes were measured to be about 1.4 mm and 6.2 mm, respectively.
김정환,김해곤 嶺南大學校附設 基礎科學硏究所 1989 基礎科學硏究 Vol.9 No.-
5-propyl-2,4,6-trichloropyrimidine, 5-sec-butyl-2,4,6-trichloropyrimidine, 5-benzyl-2,4,6-trichloropyrimidine and 1,5-Bis(2,4,6-trichloro pyrimidine-5-yl) pentane as a derivative of 5-alkyl-2,4,6-trichloropyrimidine are synthesized and examined selective substitution reaction with sodium ethoxide.