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화학조성 및 열처리경로 변화에 따른 Nimonic 80A 합금의 특성
최병강,정해용,배차헌,Choi Byong-Kang,Jeong Hae-Yong,Bae Cha-Hurn 한국재료학회 2005 한국재료학회지 Vol.15 No.12
Properties of Ni-base superalloys of Nimonic 80A alloy system were investigated by the observation of microstructures, precipitates ana hardness as a function of the chemical compositions ana the paths of heat treatment. The higher hardness values showed, the higher Ti/Al ratio among high compositions of Cr and Co element. The lower (Ti+Al) and Fe contents decreased in the same Ti/Al ratio, the higher hardness values showed. This results are considered that coherent deformation was increased with increasing Ti/Al ratio. Hardness showed higher value when Cr contents was $18 wt\%$ less than $21wt\%Cr$. In $3.15 wt\%$Co alloy, $\gamma'$ phase was very fine as around 50nm and, its volume fraction and hardness showed the highest value by 2step-aging treatment.
최병강(Byong-Kang Choi),이상희(Sang-Hee Lee) 산업기술교육훈련학회 2011 산업기술연구논문지 (JITR) Vol.16 No.4
As environmental concerns increasing, the electronics industry is focusing more attention on the lead free solder alternatives. However, the higher melting temperature of lead-free solder was likely to have problems which existing soldering equipment was being constrained. The feasibility of lead-free solder was investigated by addition of the Sn-In-Bi alloy with intermediate melting point. the melting temperature and the wetability of the Sn-In-Bi alloy compared to that of Sn-Pb and Sn-Ag solder. It was found that the zero -cross-time and wetting time of Sn-10In- 5Bi solder was similar to there of Sn-37Pb solder and was increased slightly than those of Sn-3.5Ag solder.
마그네슘 합금 핸드폰 케이스 다이캐스팅의 시뮬레이션 해석
최병강(Byong-Kang Choi) 산업기술교육훈련학회 2014 산업기술연구논문지 (JITR) Vol.19 No.3
A result analysed comparison about the actual cellular phone case product analyzed the behavior confirmation and solidification result of liquid state magnesium alloy in molds utilized CAE Software, First, It was able to understand visually charge process and temperature distribution as a simulations of die casting process. Second, It was matched each other well die casting product with numerical interpretation results and was able to control defects of the cellular phone case at die casting process. Third, It was able to much effect upon product Quality depending on the size and location of the overflow at cellular phone simulations.
박육 스테인리스 주강에 대한 유동 및 응고해석의 실험적 고찰
배차헌,정해용,최학규,박홍일,최병강 한국주조공학회 2000 한국주조공학회지 Vol.20 No.5
In order to find out the casting conditions of the thin wall stainless steel exhaust manifold for automobile, the melt flow and solidification behavior simulated by the Z-CAST program were evaluated, and experimental casting result on the test casting and exhaust manifold of SSC13 alloy were investigated. From the results of this study, it was shown that the calculated results on fluid flow were in good agreement with practical thin wall test castings under the same casting conditions, as pouring metal is austenitic stainless steel(SSC13) and pouring temperature is 1575, 1630, and 1665℃ respectively. That calculated result with designed thin wall exhaust manifold was predicted filling up into the mold cavity, and practical casting was sound. The solidification simulation was predicted shrinkages at the bosses for original exhaust manifold, and designed it without bosses was predicted no defect. Therefore practical exhaust manifold casting was sound and in good agreement with calculated solidification results.
이상희(Sang-Hee Lee),최병강(Byong-Kang Choi) 산업기술교육훈련학회 2011 산업기술연구논문지 (JITR) Vol.16 No.4
Recent great development in various electronic industries such as display, low temperature co-fired ceramic(LTCC), and packaging industry need new various glasses which satisfies the specific requirements. PbO containing glass systems are popular as a commercial low temperature and good thermal and electrical characteristics. However, recent nature protection issues have restricted the wide use of PbO systems, so the development of lead free materials, which can replace the PbO, has been undertaken. in this study Bi based glass frit was developed in PDP applications and its properties are compared with the commercially used Pb based glass frit. After optimization. of the properties of Bi based frits for PDP application such as the softening temperature and coefficient of thermal expansion(C.T.E).