工程科学学报2016，Vol.38Issue(6)：834-840,7.DOI:10.13374/j.issn2095-9389.2016.06.013
碳还原粉煤灰制备SiC/Al2 O3系复合材料
Preparation of SiC/Al2 O3 composite materials from coal fly ash
摘要
Abstract
By using coal fly ash as a raw material and graphite as a reducer in the protective atmosphere of argon, SiC/Al2 O3 composite materials were synthesized by carbothermal reduction. The reaction process of reduction of the coal fly ash was studied, and its influencing factors were investigated. The composition of products obtained at different temperatures was analyzed by X-ray diffrac-tion, and the microstructure was observed by scanning electron microscopy and energy dispersive spectroscopy. The results show that the phases of quartz and mullite in the coal fly ash are almost completely reactive at 1673 and 1773 K, respectively. With increasing temperature, the contents of SiC and Al2 O3 increase, and the suitable temperature condition is 1773 to 1873 K. The extension of hold-ing time is good for the formation of SiC and Al2 O3 , and the appropriate holding time is 3 to 4 h. Increasing the carbon content has positive effect on the formation of SiC and Al2 O3 , and the optimum molar ratio of C/Si is 4 to 5. In the prepared SiC/Al2 O3 composite materials, SiC is homogeneously dispersed in the products, and its granularity is less than 20μm.关键词
粉煤灰/碳还原/碳化硅/氧化铝/复合材料Key words
coal fly ash/carbothermal reduction/silicon carbide/alumina/composite materials分类
化学化工引用本文复制引用
李紫勇,吴春晗,郁青春,周岳珍,李玮,杨斌..碳还原粉煤灰制备SiC/Al2 O3系复合材料[J].工程科学学报,2016,38(6):834-840,7.基金项目
云南省科技领军人才培养计划资助项目(2014HA003) （2014HA003）
国家自然科学基金资助项目(51264023) （51264023）
