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J. Korean Ceram. Soc. > Volume 41(7); 2004 > Article
Journal of the Korean Ceramic Society 2004;41(7): 534.
doi: https://doi.org/10.4191/kcers.2004.41.7.534
연소합성공정에 의해 제조된 다공질 MoSi2에서 Si 함량 변화의 영향
송인혁, 김도완1, 윤중열1, 김해두
한국기계연구원 재료연구부
1한국기계연구원 재료연구
The Effects of Variation in Si Content on the Properties of Porous MoSi2 Fabricated by Self-Propagating High Temperature Synthesis Process
ABSTRACT
In this study, the effects of variation in Si content on the properties of porous MoSi$_2$ fabricated by Self-propagating High temperature Synthesis (SHS) process were investigated. Excessive Si added to the stoichiometric composition of MoSi$_2$ were ranged from 0 to 20 wt%. The preheating process prevented the unstable combustion which might occur because of the decrease in reaction temperature due to the excessive Si. With increasing Si content, the permeability of porous MoSi$_2$ material decreased due to decrease in porosity caused by the volume shrinkage after synthesis. Specific resistivity of the synthesized porous MoSi$_2$ was varied from 0.02 to 0.05Ωㆍcm as a function of the size of Mo powder. The use of excessive Si increased the rigidity due to the binder effect between clusters of MoSi$_2$ particles in case the coarse Mo powders were used to make the preform.
Key words: SHS, $MoSi_2$, Heating element, Porous material
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