以粉煤灰和活性炭为原料,通过碳热还原反应在Ar气氛下合成Al2O3-SiC粉体,探究了一条低成本合成Al2O3-SiC粉体的可行途径.研究了添加La2O3对合成过程的影响.采用XRD和SEM表征了材料的物相组成和显微形貌.结果表明:当粉煤灰与活性炭质量比为100∶44,在1 550℃下保温5h,添加6％(质量分数)的La2O3时,可合成性能良好的Al2O3-SiC粉体,颗粒分布均匀,平均粒径为0.5～1μm,较不添加La2O3合成温度降低约50℃.
Al2O3-SiC powders were synthesized by carbothermal reduction reaction in an argon atmosphere,with fly ash and activated carbon as raw materials.It provides a feasibility route with low-cost to the synthesis of Al2 O3-SiC powders.The influence of La2 O3 addition on the synthesis process was studied.The phase composition and microstructure of the powders were characterized by XRD and SEM.Results showed that the Al2O3-SiC powders could be synthesized at 1 550 ℃ for 5 h,when the mass ratio of fly ash to activated carbon was 100 ∶ 44 with addition of 6％ La2O3 (mass fraction).The powders had good performance,uniform particle distribution,and the average particle size was about 0.5-1 μm.The synthesis temperature of composite powder with La2O3 was 50 ℃ lower than that of the mixture without La2O3.
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%