Computer Simulation and Verification of Adiabatic Temperature and Apparent Activity Energy of the NiO/Al Aluminothermic System

Yuepeng Song; Zhu Yanmin; Dongsheng Gao; Jing Guo; 김형섭

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자료유형: 학술저널

저자정보: Yuepeng Song Zhu Yanmin Dongsheng Gao Jing Guo 김형섭

저널정보: 한국분말야금학회 한국분말야금학회지 한국분말야금학회지 제20권 제5호

발행연도: 2013.1

수록면: 332 - 337 (6page)

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Recently, self-propagating high-temperature synthesis (SHS), related to metallic and ceramic powder interactions,has attracted huge interest from more and more researchers, because it can provide an attractive, energy-efficient approach to the synthesis of simple and complex materials. The adiabatic temperature Tad and apparent activation energy analysis of different thermit systems plays an important role in thermodynamic studies on combustion synthesis. After establishing and verifying a mathematic calculation program for predicting adiabatic temperatures, based on the thermodynamic theory of combustion synthesis systems, the adiabatic temperatures of the NiO/Al aluminothermic system during self-propagating high-temperature synthesis were investigated. The effect of a diluting agent additive fraction on combustion velocity was studied. According to the simulation and experimental results, the apparent activation energy was estimated using the Arrhenius diagram of ln(v/Tad)~1/Tad based on the combustion equation given by Merzhanov et al. When the temperature exceeds the boiling point of aluminum (2,790 K), the apparent activation energy of the NiO/Al aluminothermic system is 64 ± 14 kJ/mol. In contrast, below 2,790 K, the apparent activation energy is 189 ± 15 kJ/mol. The process of combustion contributed to the mass-transference of aluminum reactant of the burning compacts. The reliability of the simulation results was experimentally verified.

#Adiabatic temperature #Apparent activation energy #NiO/Al aluminothermic system #Computer simulation #Self-propagating high-temperature synthesis #SHS)

참고문헌 (23)

참고문헌 신청

/ / http://webbook.nist.gov / 2004 / Combustion Synthesis / Metallurgic Industry Press

A. G. Merzhanov. / 2008 / / Int. J. Self-Propag. High-Temp. Synth 17 : 242 ~

B. Rupp. / 1992 / / Calphad 16 : 377 ~

D. L. Ye / 1981 / Practical Thermodynamics Data Manual of inorganics / Metallurgic Industry Press