| 碳还原粉煤灰制备SiC/Al2 O3系复合材料 |
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| 引用本文： | 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. DOI: 10.13374/j.issn2095-9389.2016.06.013 |
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| 作者姓名： | 李紫勇 吴春晗 郁青春 周岳珍 李玮 杨斌 |
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| 作者单位： | 昆明理工大学真空冶金国家工程实验室，昆明650093;昆明理工大学云南省有色金属真空冶金重点实验室，昆明650093;昆明理工大学冶金与能源工程学院，昆明650093;昆明理工大学真空冶金国家工程实验室，昆明650093;昆明理工大学云南省有色金属真空冶金重点实验室，昆明650093;昆明理工大学冶金与能源工程学院，昆明650093;昆明理工大学真空冶金国家工程实验室，昆明650093;昆明理工大学云南省有色金属真空冶金重点实验室，昆明650093;昆明理工大学冶金与能源工程学院，昆明650093;昆明理工大学真空冶金国家工程实验室，昆明650093;昆明理工大学云南省有色金属真空冶金重点实验室，昆明650093;昆明理工大学冶金与能源工程学院，昆明650093;昆明理工大学真空冶金国家工程实验室，昆明650093;昆明理工大学云南省有色金属真空冶金重点实验室，昆明650093;昆明理工大学冶金与能源工程学院，昆明650093;昆明理工大学真空冶金国家工程实验室，昆明650093;昆明理工大学云南省有色金属真空冶金重点实验室，昆明650093;昆明理工大学冶金与能源工程学院，昆明650093 |
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| 基金项目： | 国家自然科学基金资助项目(51264023)云南省科技领军人才培养计划资助项目(2014HA003) |
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| 摘 要： | 在氩气气氛下,以粉煤灰为原料,石墨为还原剂,研究碳还原粉煤灰制备SiC/Al2O3系复合材料的反应过程,并探索其制备的工艺条件.利用X射线衍射分析还原产物的物相变化规律,使用扫描电镜和能谱仪观察复合材料的微观结构.结果表明:在1673 K粉煤灰中石英相与碳反应生碳化硅,1773 K莫来石相基本分解完全.随着反应温度的升高,生成碳化硅和氧化铝含量增加,较合适的温度条件为1773~1873 K;保温时间的延长,有利于碳化硅和氧化铝的生成,较好的保温时间为3~4 h;增加配碳量对碳化硅和氧化铝的生成有促进作用,较合适的C/Si摩尔比为4~5.在制备出的SiC/Al2O3复合材料中碳化硅在产物中分散较为均匀,并且粒度小于20μm.
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| 关 键 词： | 粉煤灰 碳还原 碳化硅 氧化铝 复合材料 |
| 收稿时间： | 2015-06-26 |
Preparation of SiC/Al2O3 composite materials from coal fly ash |
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| Affiliation: | 1. National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China;2. Yunnan Provincial Key Laboratory of Vacuum Metallurgy for Non-ferrous Metal, Kunming University of Science and Technology, Kunming 650093, China;3. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China |
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| Abstract: | By using coal fly ash as a raw material and graphite as a reducer in the protective atmosphere of argon,SiC/Al2O3 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 diffraction,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 Al2O3 increase,and the suitable temperature condition is 1773 to 1873 K.The extension of holding time is good for the formation of SiC and Al2O3,and the appropriate holding time is 3 to 4 h.Increasing the carbon content has positive effect on the formation of SiC and Al2O3,and the optimum molar ratio of C/Si is 4 to 5.In the prepared SiC/Al2O3 composite materials,SiC is homogeneously dispersed in the products,and its granularity is less than 20 μm. |
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