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P형 Fe(Mn)Si<sub>2</sub> 열전재료 분말의 성형 및 미세조직
심재식,홍순직,천병선,Shim, J.S.,Hong, S.J.,Chun, B.S. 한국분말야금학회 2008 한국분말재료학회지 (KPMI) Vol.15 No.5
The effects of the dopant (Mn) ratio on the microstructure and thermoelectric properties of $FeSi_2$ alloy were studied in this research. The alloy was fabricated by a combination process of ball milling and high pressure pressing. Structural behavior of the sintered bulks were systematically investigated by XRD, SEM, and optical microscopy. With increasing dopan (Mn) ratio, the density and ${\varepsilon}-FeSi$ phase of the sintered bulks increased and maximum density of 94% was obtained in the 0.07% Mn-doped alloy. The sintered bulks showed fine microstructure of ${\alpha}-Fe_{2}Si_{5}$, ${\varepsilon}-FeSi$ and ${\beta}-FeSi_2$ phase. The semiconducting phase of ${\beta}-FeSi_2$ was transformed from ${\alpha}-Fe_{2}Si_{5}+{\varepsilon}-FeSi$ phase by annealing.
자기펄스성형법 및 통전가압소결법의 연속공정을 이용한 고밀도 나노 알루미나 세라믹의 제조
이종극,홍순직,이민구,이창규,Lee, J. K.,Hong, S. J.,Lee, M. K.,Rhee, C. K. 한국분말야금학회 2005 한국분말재료학회지 (KPMI) Vol.12 No.5
In this study the nanostructured ${\alpha}-Al_{2}O_3$ ceramics have been fabricated by the combined application of magnetic pulsed compaction (MPC) and subsequent spark plasma sintering (SPS), and their density and hardness properties were investigated. The ${\alpha}-Al_{2}O_3$ prepared by the combined processes showed an increase by $8.4\%$ in density, approaching the value close to the true density, and an enhancement by $210\~400\;Hv$ in hardness, compared to those fabricated by MPC or static compaction method followed by sintering treatment.
자기펄스압축성형 장치를 이용한 n-type 95%Bi₂Te₃-5%Bi₂Se₃ 열전분말의 성형 및 열전특성 평가
김효섭(H. S. Kim),김택수(T. S. Kim),홍순직(S. J. Hong) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5
N-Type SbI₃-doped 95%Bi₂Te₃-5%Bi₂Se₃ compounds were prepared by a gas atomization and Magnetic Pulsed Compaction process. The dynamic recrystallization and thermoelectric properties of the MPCed bulks with consolidation temperatures and times were investigated by a combination of microscopy, XRD and thermoelectric property testing. The microstructure of MPCed bulk shows homogeneous and fine distribution through consolidated bulks due to dynamic recrystallization during hot MPC. This research presented the challenges toward the successful consolidation of thermoelectric powder using magnetic pulsed compaction (MPC).
자기펄스 가압성형법에 의한 알루미나 나노분말의 치밀화 및 특성 평가
강래철,이민구,김홍회,이창규,홍순직,Kang, R.C.,Lee, M.K.,Kim, W.W.,Rhee, C.K.,Hong, S.J. 한국분말야금학회 2008 한국분말재료학회지 (KPMI) Vol.15 No.1
This article presents the challenges toward the successful consolidation of $Al_2O_3$ nanopowder using magnetic pulsed compaction (MPC). In this research the ultrafine-structured $Al_2O_3$ bulks have been fabricated by the combined application of magnetic pulsed compaction (MPC) and subsequent sintering, and their properties were investigated. The obtained density of $Al_2O_3$ bulk prepared by the combined processes was increased with increasing MPC pressure from 0.5 to 1.25 GPa. Relatively higher hardness and fracture toughness in the MPCed specimen at 1.25 GPa were attributed to the retention of the nanostructure in the consolidated bulk without cracks. The higher fracture toughness could be attributed to the crack deflection by homogeneous distribution and the retention of nanostructure, regardless of the presence of porosities. In addition, the as consolidated $Al_2O_3$ bulk using magnetic pulsed compaction showed enhanced breakdown voltage.
자기펄스 압축성형법으로 성형된 Ag-SnO<sub>2</sub> 접점소재의 미세조직 및 특성
박종석,김영재,이민하,이효수,홍순직,이진규,Park, J.S.,Kim, Y.J.,Lee, M.H.,Lee, H.S.,Hong, S.J.,Lee, J.K. 한국분말야금학회 2011 한국분말재료학회지 (KPMI) Vol.18 No.4
In this study, we reported the microstructure and properties of Ag-$SnO_2$ contact materials fabricated by a controlled milling process with subsequent consolidation. The milled powders were consolidated to bulk samples using a magnetic pulsed compaction process. The nano-scale $SnO_2$ phases were distributed homogeneously in the Ag matrix after the consolidation. The relative density and hardness of the Ag-$SnO_2$ contact materials were 95~96% and 89~131 Hv, respectively.