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Two-dimensional numerical study of solid-solid combustion
Sung-ChulYi,KeunHoAuh 한양대학교 세라믹연구소 2002 Journal of Ceramic Processing Research Vol.3 No.3
A detailed two-dimensional numerical study of the highly exothermic nature of synthesis of refractory materials is presented. The process is modeled by a two-dimensional, pseudohomogeneous model. The model equations, which are very stiff and exhibit varying time and length scales, are implemented in the commercially- available computational fluid dynamics code, FLUENT using user-defined-functions (UDFs). The implementation of the new model is validated using a sample problem solved earlier by Degreve et al. [1]. The new model correctly captured the complex behavior of the combustion front.
Thermoelectric properties of silicon hexaboride prepared by spark plasma sintering method
KwangBoShim,KyoungHunKim,J.Matsushita,K.Niihara,KeunHoAuh,DaeWoongLee 한양대학교 세라믹연구소 2002 Journal of Ceramic Processing Research Vol.3 No.3
Silicon hexaboride is attractive for various industrial applications because of its high temperature capability, high hardness and excellent electrical conductivity, in particular it is a promising material for use as a thermoelectric semiconductor at high temperature. We have used a spark plasma sintering technique to produce silicon hexaboride ceramics. The Seebeck coefficient, electrical conductivity and thermal conductivity were measured and the effect of additives, phase composition and microstructure on the thermoelectric properties were discussed. The approximate value of Z (figure of merit value) of the SPS specimen reached about 9.6×10-6/K at 1273 K. The thermoelectric properties (Z) of the SPS specimen are improved in comparison with the specimen by hot-pressing. The effect of the addition of lanthanum and boron on thermoelectric properties of SiB6 were also evaluated.