工程科学学报，第38卷，第6期：834840,2016年6月 Chinese Journal of Engineering,Vol.38,No.6:834-840,June 2016 DOI:10.13374/j.issn2095-9389.2016.06.013:http://journals.ustb.edu.cn 碳还原粉煤灰制备SiC/Al,O3系复合材料 李紫勇12》，吴春晗12,3》，郁青春123)区，周岳珍123，李玮2,3》，杨斌2》 1)昆明理工大学真空治金国家工程实验室，昆明6500932)昆明理工大学云南省有色金属真空治金重点实验室，昆明650093 3)昆明理工大学治金与能源工程学院，昆明650093 ☒通信作者，E-mail:yqcy@163.com 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SC/A山，0，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1673K粉煤灰中石英相与碳反应生碳化硅，1773K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1773~1873K: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~ 4h: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/AL,O,复合材料中碳化 硅在产物中分散较为均匀，并且粒度小于20m 关键词粉煤灰：碳还原：碳化硅：氧化铝：复合材料 分类号T0174:TB332 Preparation of SiC/Al,O,composite materials from coal fly ash lZ五与ong2.a》,WU Chun-han'2.,YU Qing-thun2,a,ZHOU Yue-hen2.,lWe-2.》,YANG Bin2,a》 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 Corresponding author,E-mail:yqey@163.com ABSTRACT By using coal fly ash as a raw material and graphite as a reducer in the protective atmosphere of argon,SiC/Al,O 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 AlO 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 AlO,and the appropriate holding time is 3 to 4 h.Increasing the carbon content has positive effect on the formation of SiC and Al2O,,and the optimum molar ratio of C/Si is 4 to 5.In the prepared SiC/Al,O:composite materials,SiC is homogeneously dispersed in the products,and its granularity is less than 20 um. KEY WORDS coal fly ash:carbothermal reduction:silicon carbide:alumina:composite materials 碳化硅材料具有高温强度大、抗氧化性强、热稳性，越来越受到人们的关注，已在许多领域得到应 定性好、热膨胀系数小、热导率大、硬度高等优良特 用四.氧化铝质材料是目前研究最为广泛的陶瓷材 收稿日期：2015-06-26 基金项目：云南省科技领军人才培养计划资助项目(2014HA003)：国家自然科学基金资助项目(51264023)工程科学学报，第 38 卷，第 6 期: 834--840，2016 年 6 月 Chinese Journal of Engineering，Vol． 38，No． 6: 834--840，June 2016 DOI: 10． 13374 /j． issn2095--9389． 2016． 06． 013; http: / /journals． ustb． edu． cn 碳还原粉煤灰制备 SiC /Al2 O3 系复合材料 李紫勇1，2，3) ，吴春晗1，2，3) ，郁青春1，2，3) ，周岳珍1，2，3) ，李 玮1，2，3) ，杨 斌1，2，3) 1) 昆明理工大学真空冶金国家工程实验室，昆明 650093 2) 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 3) 昆明理工大学冶金与能源工程学院，昆明 650093  通信作者，E-mail: yqcy@ 163． com 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 20 μm． 关键词 粉煤灰; 碳还原; 碳化硅; 氧化铝; 复合材料 分类号 TQ174; TB332 Preparation of SiC /Al2O3 composite materials from coal fly ash LI Zi-yong1，2，3) ，WU Chun-han1，2，3) ，YU Qing-chun1，2，3)  ，ZHOU Yue-zhen1，2，3) ，LI Wei1，2，3) ，YANG Bin1，2，3) 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  Corresponding author，E-mail: yqcy@ 163． com 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 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 Al2O3 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 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． KEY WOＲDS coal fly ash; carbothermal reduction; silicon carbide; alumina; composite materials 收稿日期: 2015--06--26 基金项目: 云南省科技领军人才培养计划资助项目( 2014HA003) ; 国家自然科学基金资助项目( 51264023) 碳化硅材料具有高温强度大、抗氧化性强、热稳 定性好、热膨胀系数小、热导率大、硬度高等优良特 性，越来越 受 到 人 们 的 关 注，已 在 许 多 领 域 得 到 应 用［1］． 氧化铝质材料是目前研究最为广泛的陶瓷材