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김동원(Dong-Won Kim),조규일(Kyu-Il Cho),김현근(Hyun-Keun Kim),강자연(Ja-Youn Kang),이원혁(Won-Hyuk Rhee),황금철(Keum-Cheol Hwang) 한국표면공학회 2008 한국표면공학회지 Vol.41 No.5
The porous metal material is used for injection metal mold with a great deal of gas production because it makes plenty of gas exhausted through pores formed in the metal mold. A canning HIP method was conventionally used for manufacturing of porous metals, but because of difficulty of process control and high cost of production its application was limited. In this experiment, porous metal mold material was produced by an enhanced vacuum sintering method with simply controlled and economical process and porosities/mechanical properties with variation of sintering temperature and duration time during vacuum sintering were studied. As a result, quality goods were obtained at optimized conditions as follows: sintering temperature of 1230℃, duration time of 2 hr and showed superior properties in wear loss and thermal conductivity and the same properties in hardness, TRS (Transverse Rupture Strength), and thermal expansion coefficient in comparison with those under canning HIP.
TiC 분산된 니켈기 합금의 미세조직 및 기계적 특성에 미치는 열처리 영향
홍성현,황금철,이원혁,진억용,Hong, Seong-Hyeon,Hwang, Keum-Chul,Rhee, Won-Hyuk,Chin, Eog-Yong 한국분말야금학회 2002 한국분말재료학회지 (KPMI) Vol.9 No.6
The microstructures and properties of TiC dispersed nickel-base alloy were studied in this work. The alloy prepared by powder metallurgical processing was solution treated, 1st-aged at $880^{\circ}C$ for 16 hours, and then 2nd-aged at $760^{\circ}C$ for 4 hours. Microstucture of sintered specimen showed that TiC particles are uniformly dispersed in Ni base alloy. In the specimen aged at $880^{\circ}C$ for 8 hours, the fine $\gammaNi_3$(Al,Ti) precipitates with round shape are observed and the very fine $\gammaNi_3$(Al,Ti) particles with round shape are precipitated in the specimen aged at $760^{\circ}C$ for 4 hours. The presence of ${\gamma}$precipitates in TiC/Ni base alloy increased the hardness and wear resistance of the specimen. The hardness and wear resistance of the Ni-base with TiC are higher than those of conventional Ni-base superalloy X-750 because of dispersion strengthening of TiC particles. The hardness, transverse rupture strength and resistance of the specimen 2nd-aged at $760^{\circ}C$ for 4 hours are higher than those of 1st-aged specimen due to ultrafine $\gammaNi_3$(Al,Ti) precipitates.
B<sub>4</sub>C 함량에 따른 6061 Al-B<sub>4</sub>C 복합분말의 소결 특성 연구
박진주,홍성모,김경열,이민구,이창규,이원혁,이양규,Park, Jin-Ju,Hong, Sung-Mo,Kim, Kyoung-Yeol,Lee, Min-Ku,Rhee, Chang-Kyu,Rhee, Won-Hyuk,Lee, Yang Kyu 한국분말야금학회 2013 한국분말재료학회지 (KPMI) Vol.20 No.3
In the present work, 6061 Al-$B_4C$ sintered composites containing different $B_4C$ contents were fabricated and their characteristic were investigated as a function of sintering temperature. For this, composite powders and their compacts with $B_4C$ various contents from 0 to 40 wt.% were fabricated using a planetary ball milling equipment and cold isostatic pressing, respectively, and then they were sintered in the temperature ranges of 580 to $660^{\circ}C$. Above sintering temperature of $640^{\circ}C$, real density was decreased due to the occurrence of sweat phenomena. In addition, it was realized that sinterability of 6061Al-$B_4C$ composite material was lowered with increasing $B_4C$ content, resulting in the decrease in its real density and at the same time in the increment of porosity.