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为获得具有良好使用性能的碳化硅基陶瓷复合材料,以亚微米级Si C粉体和分析纯的Al(NO_3)_3与Y(NO_3)_3为主要实验原料、氨水为沉淀剂,用共沉淀包覆方法制备Si C-Al_2O_3-Y_2_O3纳米复合粉体,对复合粉体前驱体的DTA进行分析,并研究其在煅烧过程中的物相变化,以及煅烧温度对复合粉体的分散性和烧结性的影响。结果表明:Al_2O_3和Y_2O_3反应生成新相YAG,当YAG质量分数为10%、煅烧温度为600℃,复合粉体的烧结性能最好。
In order to obtain silicon carbide-based ceramic composites with good serviceability, submicron Si C powder and analytically pure Al (NO 3) 3 and Y (NO 3) 3 as the main experimental materials, ammonia as a precipitating agent, coprecipitation Coating method to prepare Si C-Al 2 O 3 -Y 2 O 3 nanocomposite powder, analyze the DTA of the composite powder precursor, and study its phase change during the calcination process, as well as the calcination temperature of the composite powder dispersion and sintering Sexual effects. The results show that the reaction of Al 2 O 3 with Y 2 O 3 leads to the formation of new phase YAG. When the content of YAG is 10% and calcination temperature is 600 ℃, the sintering behavior of composite powders is the best.