Thermal oxidation of SiAlON powders synthesized from coal gangue  

作　　者：Xin-mei Hou Chang-sheng Yue Mei Zhang Kuo-chih Chou 

机构地区：[1]School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China [2]The Key Laboratory of Ecological ＆ Recycle Metallurgy, Ministry of Education of China, Beijing 100083, China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2011年第1期77-82,共6页矿物冶金与材料学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.50874013);the support from the Key Lab. of the Ministry of Education of China for Ecologic & Recycle Metallurgy,University of Science and Technology Beijing

摘　　要：The oxidation behavior of different SiAlON phases（β-SiAlON,X-phase SiAlON and 12H powders） synthesized from coal gangue in air atmosphere was investigated using isothermal thermogravimetry（TG） and field-emission scanning electron microscopy（FE-SEM）.The effect of ferric oxide impurities in coal gangue was studied.The results show that ferric oxide contributes to the growth of SiAlON crystalline during the synthesis process.In the oxidation experiment,the existence of ferric oxide decreases the oxidation resistance of SiAlON.The reason is that the impurity causes the formation of a liquid phase at a higher temperature.At 1423-1623 K,the oxidation of SiAlON powders is diffusion controlled and it can be described by Chou＇s model.A fair agreement is found between theoretical calculations and the experimental data.The oxidation behavior of different SiAlON phases（β-SiAlON,X-phase SiAlON and 12H powders） synthesized from coal gangue in air atmosphere was investigated using isothermal thermogravimetry（TG） and field-emission scanning electron microscopy（FE-SEM）.The effect of ferric oxide impurities in coal gangue was studied.The results show that ferric oxide contributes to the growth of SiAlON crystalline during the synthesis process.In the oxidation experiment,the existence of ferric oxide decreases the oxidation resistance of SiAlON.The reason is that the impurity causes the formation of a liquid phase at a higher temperature.At 1423-1623 K,the oxidation of SiAlON powders is diffusion controlled and it can be described by Chou＇s model.A fair agreement is found between theoretical calculations and the experimental data.

关 键 词：oxidation KINETICS silicon compounds POWDERS COAL 

分 类 号：TF[冶金工程]