摘要
采用热重分析法研究升温速率和反应气流量对铁精粉氧化过程的影响。采用积分法对不同气体流量条件下的热重数据进行处理得到反应的动力学参数（表观活化能目。研究结果表明：升温速率和气体流量均能改变氧化产物的微观形貌；在整个氧化反应过程中，主要步骤由外扩散型转变为内扩散型，最后转变为外扩散型；220～350℃时，表观活化能为48～52kJ／mol；400～600℃时，表观活化能为22～30kJ／mol；620～750℃时，表观活化能为11～15kJ／mol；当升温速率8℃／min时，反应的最佳气流晕为45mL／min。
Ferrous powder oxidation processing was studied by thermogravimetry with different heating rates and gas fluxes. Experimental data treated according integral method and the kinetics parameter E was obtained with different gas flux. The results show that heating rate and gas flux can change microstructure of oxidized products. The major step of oxidation of ferrous powder changes from out diffusion to inner diffusion, and finally to out diffusion. Energy of oxidation is between 48 kJ/mol and 52 kJ/mol from 220 ℃ to 350℃, between 22 kJ/mol and 30 kJ/mol from 400 ℃ to 600 ℃, and between 11 kJ/mol and 15 kJ/mol from 620 ℃ to 750℃, respectively. Optimal gas flux is 45 mL/min under the condition of heating rate of 8 ℃/min.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第1期56-61,共6页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51074105)
国家高技术研究发展计划("973"计划)项目(2007CB613606)
攀枝花市科委资助项目(2008CY-G-6)
上海大学第三届研究生创新基金(SHUCX091031)
关键词
铁精粉
氧化
反应动力学
ferrous powder
oxidation
reaction kinetics
