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Journal of the Korean Ceramic Society 1995;32(6): 659. |
SHS법에 의한 ZrC 합성 및 온도 Profile 분석 |
이형복, 조건1, 이재원 |
명지대학교 무기재료공학과 1한국과학기술원 무기재료공학과 |
Synthesis and Temperature Profile Analysis of ZrC by SHS Method |
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ABSTRACT |
Zirconium carbide was prepared from the mixture of metal zirconium and carbon powders in argon atmosphere by Self-propagating High-temperature Synthesis (SHS) in order to obtain the best carbon source and dilution contents. The most exellent result was obtained in the case that active carbon was added as a starting material, 20~30 wt% dilution content. From thermal profile analysis an apparent activation energy of 118 KJ/mol was calculated. The maximum heating rate achieved during 15 wt% ZrC reaction by product dilution method was approximately 1.54$times$105 K/s. Coupling this value with the measured wave velocity of 1.026cm/s yielded a maximum thermal gradient fo $1.5times$105 K/cm. Using the definition of t* and the measured wave velocity, the effective thermal diffusivity, $alpha$, was calculated to be 0.62$times$102 $textrm{cm}^2$/s. |
Key words:
Zirconium carbide, Thermal profile analysis, Wave velocity, Thermal gradient, Thermal diffusivity |
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