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J. Korean Ceram. Soc. > Volume 32(3); 1995 > Article
Journal of the Korean Ceramic Society 1995;32(3): 341.
SHS 법에 의한 $Ti5_Si_3$의 합성시 온도 Profile 분석
김도경, 이형직1, 김익진2, 이형복
명지대학교 무기재료공학과
1강릉대학교 재료공학과
2한서대학교 재료공학과
Temperature Profile Analysis of $Ti5_Si_3$ in Self-Propagating High Temperature Synthesis
ABSTRACT
An analysis of the use of temperature profiles in the determination of the kinetic parameters of combustion synthesis of Ti5Si3 were investigated. From profile analysis, an apparent activation energy of 12KJ/mol was calculated. The Maximum heating rate achieved during 10wt% Ti5Si3 reaction by the product dilution method was approximately $1.5times$104 K/s. Coupling this value with the measured wave velocity of 7.02 cm/s yields a maximum thermal gradient of 2.14$times$103 K/cm. The value of tr (=t*) was calculated to be 1.2$times$10-1 s and the value of td (=tx) was calculated to be 32.89 s. Using the definition of t* and the measured wave velocity, the effective thermal diffusivity, $alpha$, was calculated to be 0.59$times$10 $textrm{cm}^2$/s. From these analysis, the power function, G, was also calculated.
Key words: Temperature profile, Kinetic parameter, Combustion synthesis, $Ti5_Si_3$, Activation energy, Thermal diffusivity, Power function
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