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흑연 함량에 따른 알루미늄 기지 복합재료의 방전플라즈마소결 거동 및 방열 특성
권한상,박재홍,주성욱,홍상휘,문지훈,Kwon, Hansang,Park, Jehong,Joo, Sungwook,Hong, Sanghwui,Mun, Jihoon 한국분말야금학회 2016 한국분말재료학회지 (KPMI) Vol.23 No.3
Composite materials consisting of pure aluminum matrix reinforced with different amounts of graphite particles are successfully fabricated by mechanical ball milling and spark plasma sintering (SPS) processes. The shrinkage rates of the composite powders vary with the amount of graphite particles and the lowest shrinkage value is observed for the composite with the highest amount of graphite particles. The current slopes of time increase with increase in the amount of graphite particles whereas the current slopes of temperature show the opposite trend. The highest thermal conductivity is achieved for the composite with the least amount of graphite particles. Therefore, the thermal properties of the composite materials can be controlled by controlling the amount of the graphite particles during the SPS process.
분말야금공정으로 제조된 TiC/steel 금속복합재료의 미세조직 및 기계적 물성 연구
이지혜 ( Jihye Lee ),조승찬 ( Seungchan Cho ),권한상 ( Hansang Kwon ),이상관 ( Sang-kwan Lee ),이상복 ( Sang-bok Lee ),김대하 ( Daeha Kim ),김정환 ( Junghwan Kim ) 한국복합재료학회 2021 Composites research Vol.34 No.5
본 연구에서는 3 wt.%, 10 wt.% Cr이 함유된 Fe-합금 분말을 기지 금속으로 하여 분말야금공정을 통해 TiC/steel 금속복합재료를 제조하였다. 이후 복합재료의 기계적 물성에 미치는 열처리의 영향을 고찰하고자, 어닐링 열처리 및 칭-템퍼링 열처리를 실시하였다. 인장, 압축 그리고 항절력 시험과 미세조직 분석을 통하여 Cr 함량 및 열처리 조건에 따른 미세조직의 변화와 구조적 강도 변화의 연관성을 고찰하였다. 10 wt.% Cr을 함유한 TiC/steel의 경우, TiC/steel 계면에서 형성된 조대한 Cr carbide의 영향으로 상온 인장강도 및 항절력이 크게 저하하였다. 이에 반해 압축강도에서는 Cr이 3 wt.%, 10 wt.% 함유된 TiC/steel 복합재료 모두 Cr carbide의 유무와 관계없이 어닐링 열처리 시편에 비해 칭-템퍼링 열처리 후 약 4 GPa에 달하는 높은 압축강도를 보였다. In this study, TiC/steel metal matrix composites were fabricated by powder metallurgy process using Fealloy powders with 3 wt.% Cr and 10 wt.% Cr, respectively, as matrix material. Subsequently, the composite samples were heat treated by the annealing and quenching-tempering(Q-T), respectively, to understand the effect of heat treatment on the mechanical properties of the composites. The correlation between microstructure and structural strength depending on the chromium content and the heat treatment conditions was studied through tensile, compressive, and transverse rupture test and microstructural analysis. In the case of TiC/steel composite containing 10 wt.% Cr, the tensile strength and transverse rupture strength at room temperature were significantly lowered by the influence of coarse chromium carbide formed at the TiC/steel interface. On the other hand, both TiC/steel composites containing 3 wt.% Cr and 10 wt.% Cr showed much higher compressive strength of about 4 GP after quenchingtempering compared to the annealed specimens regardless of the presence of the chromium carbide.
알루미늄-스테인레스스틸-구리 경사기능재료의 제조 및 특성평가
박광재 ( Kwangjae Park ),김다솜 ( Dasom Kim ),권한상 ( Hansang Kwon ) 한국복합재료학회 2023 Composites research Vol.36 No.4
Aluminum (Al) and copper(Cu) are non-ferrous alloys with excellent electrical and thermal conductivity but have relatively lower mechanical properties than iron alloys. Stainless steel(STS), an iron alloy, is a high-strength industrial material due to its excellent mechanical properties and corrosion resistance compared to non-ferrous Al and Cu. In this research combined Al, Cu, and STS to fabricate as a functionally graded material (FGM) through a powder metallurgical process. The produced FGM exhibited lightweight and excellent surface hardness compared to copper and iron alloys and also showed higher thermal conductivity than single Al and STS materials.
습식 교반 및 방전 플라즈마 소결 공정에 의한 CNT 분산 Cu 복합재료 제조
조승찬,조일국,이상복,이상관,최문희,박재홍,권한상,김양도,Cho, Seungchan,Jo, Ilguk,Lee, Sang-Bok,Lee, Sang-Kwan,Choi, Moonhee,Park, Jehong,Kwon, Hansang,Kim, Yangdo 한국분말야금학회 2018 한국분말재료학회지 (KPMI) Vol.25 No.2
Multi-walled carbon nanotube (MWCNT)-copper (Cu) composites are successfully fabricated by a combination of a binder-free wet mixing and spark plasma sintering (SPS) process. The SPS is performed under various conditions to investigate optimized processing conditions for minimizing the structural defects of CNTs and densifying the MWCNT-Cu composites. The electrical conductivities of MWCNT-Cu composites are slightly increased for compositions containing up to 1 vol.% CNT and remain above the value for sintered Cu up to 2 vol.% CNT. Uniformly dispersed CNTs in the Cu matrix with clean interfaces between the treated MWCNT and Cu leading to effective electrical transfer from the treated MWCNT to the Cu is believed to be the origin of the improved electrical conductivity of the treated MWCNT-Cu composites. The results indicate the possibility of exploiting CNTs as a contributing reinforcement phase for improving the electrical conductivity and mechanical properties in the Cu matrix composites.