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Skutterudite CoSb<sub>3</sub>의 합성 및 열전특성
김일호,유신욱,박종범,이정일,어순철,장경욱,최국선,김준수,김현주,Kim I. H.,You S. W.,Park J. B.,Lee J. I.,Ur S. C.,Jang K. W.,Choi G. S.,Kim J. S.,Kim H. J. 한국재료학회 2005 한국재료학회지 Vol.15 No.10
Binary skutterudite $CoSb_3$ compounds were prepared by the arc melting and hot pressing processes and their thermoelectric properties were investigated in the range from 300 to 600 K. Annealing effect was correlated to phase transformation and homogenization. Thermoelectric properties of the arc-melted and hot-pressed $CoSb_3$ were discussed and compared. Undoped intrinsic $CoSb_3$ prepared by the arc melting showed p-type conduction, while it showed metallic behavior with increasing measuring temperature. However, hot pressed specimens showed n-type conduction, possibly due to Sb evaporation. Thermoelectric properties were remarkably improved by annealing In vacuum and they were closely related to phase transformation.
김근준(K. J. Kim),김준호(J. H. Kim),석치훈(C. H. Seok),박대규(D. K. Park),최국선(G. S. Choi),김문철(M. C. Kim),하태권(T. K. Ha) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.10
High temperature deformation behavior of heat-resisting duplex stainless steel for retort used i Pidgeon process for Mg production was investigated in this study. 25Cr-8Ni based duplex stainless steels were cast into rectangular ingots of which the dimension was 350x350x100mm<SUP>3</SUP>. Some amount of Nitrogen and Yttrium was added and phase equilibrium was calculated using the thermodynamic software FactSage® and the database of FSStel. For comparison, 310S steel, widely used heat-resisting austenitic stainless steel, was also casts in this study. On ingotsm dilatometry was carried out in the temperature range from RT to 1200℃ and thermal expansion coefficient were evaluated. Addition of N and Y had no effect on the thermal expansion behavior. High temperature tensile and compression tests were conducted on the ingots at 1230℃, which is operation temperature employed for Mg production by Silicothermic reduction. The steel with N and Y showed much higher strength than 310S in both tensile and compression tests. By thermal exposition at 1230℃ for 64 hrs, hardness of duplex stainless steel containing N and Y was found to increase, while of 310S decreased.