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질화붕소가 스프레이코팅된 흑연과 용융 알미늄간의 진공에서의 반응기구
정재인(J. I. Jeong),임병문(B. M. Lim),문종호(J. H. Moon),홍재화(J. H. Hong),강정수(J. S. Kang),이영백(Y. P. Lee) 한국진공학회(ASCT) 1994 Applied Science and Convergence Technology Vol.3 No.1
질화붕소를 스프레이코팅한 흑연과 용융 알미늄간의 진공에서의 반응기구를 여러 가지 분석장치를 이용하여 조사하였다. 계면에 형성된 화합물층은 잘 정의된 형태를 보였으며, Al₄C₃와 Al_8B₄C_7의 혼합상이 흑연 바로 위에 형성되었고 그 위는 주로 AlN층으로 이루어져 있었다. 이러한 화합물의 생성과정과 반응기구를 자유에너지 관점에서 논의하였다. 이러한 방법으로 흑연 보우트를 제조하여 알미늄 증발에 이용하였을 경우, 매우 안정적인 증발 양상을 보였으며, 0.6 ㎛/min 이상의 매우 높은 증발율을 얻을 수 있음을 확인하였다. 또한 제조원가가 저렴하고 (TiB₂BN 보우트의 약 1/100), 전자빔 증발에 의해 형성된 피막과 비교하여 손색이 없는 피막을 얻을 수 있어 새로운 저항가열 증발원으로서의 이용 가능성을 확인하였다. We have investigated the reaction mechanism between BN-sprayed graphite and molten Al in vacuum using the various analytical tools. The interfacial compound layers were well-defined, and made mainly of AlN with underlying thin mixed layer of Al₄C₃ and Al_8B₄C_7. The analysis results were interpreted in terms of the free energy of formation. We prepared the BN-sprayed and annealed graphite boat, and evaluated the performance characteristics for the evaporation of Al. The evaporation was very stable, and also extended lifetime and enhanced rate up to 0.6 ㎛/min were obtained at a manufacturing cost of about 1% compared with current TiB₂ㆍBN boat.
십자형금형을 이용한 ARS Pre-Coated Metal의 프레스 성형성에 관한 연구
전성진(S. J. Jeon),김덕률(D. R. Kim),임병문(B. M. Lim) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.10
Formability is one of the most important factors for pre-coated metal steel sheet. Both high formability of the steel substrate and high integrity of the paint films on it after processing are required. In this study, tension-compression strain energy of various ARS paint films were cross-die cup drawing, and the relationship between the abrasion resistance solid of paint films and integrity of paint films of PCM after drawing were studied. The cross-die cup drawing test enabled strain path far into the tension-compression region, thus creating the possibility to extend the experimental base both for definition and for further extrapolation of the sheet metal forming limit curve (FLC) in the tension-compression region, as well as to evaluate comparison of abrasion resistance solid with system properties of paint films for the same region after drawing. The damage of paint films after deformation in the drawing mode in which steel sheets were subjected to tensile and compressive strain. Automated Strain Analysis and Measurement Environment (ASAME) strain-measuring system is used for detect deformations in deep-drawn parts and calculate material strain using optical measuring techniques.