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난류용탕 in-situ 합성법에 의해 제조된 TiB<sub>2</sub> 입자강화 Cu 기지 복합재료의 특성
김정훈,윤지훈,이길근,최일동,박용호,조경목,박익민,Kim J. H.,Yun J. H.,Lee G. G.,Choi I. D.,Park Y. H.,Cho K. M.,Park I. M. 한국재료학회 2005 한국재료학회지 Vol.15 No.12
A copper matrix composite reinforced by turbulent in-situ $TiB_2$ nanoparticle was Prepared by reactions of boron ana titanium. The microstructure, mechanical and electrical properties of the as-drawn composites were investigated. The results showed that the formed $TiB_2$ particles, which had a size of about from 50 to 200nm, exhibited a homogeneous dispersion in the copper matrix. Due to their reinforcement, the hardness and Young's modulus of $Cu-TiB_2$ composites were enhanced with increasing the cooling rate. Moreover, the electrical conductivity of the composites were improved with increasing the cooling rate.
김정훈(J.H. Kim),전형열(H.Y. Jun),김병수(B. Kim) 한국전산유체공학회 2017 한국전산유체공학회지 Vol.22 No.3
The conductive thermal model reduction method is introduced to condense a satellite panel thermal model into a simplified model to make efficient calculations in the thermal analysis of a satellite in orbit. The static condensation algorithm with a substitution matrix manipulation is employed to handle the large matrices without any numerical restriction. On the conductive thermal model reduction in the steady state and transient, the reduced thermal model analysis is performed to compare with the results of the detailed model. The temperature difference between the reduced model and the detailed model is not affected by condensed node selection. By using the reduced model temperatures, the eliminated node temperatures in the detailed model are able to be recovered without differences by the substitution matrix.