镁铝尖晶石-钇铝石榴石复相材料的制备研究

Study on Preparation of MA-YAG Composites

以富铝尖晶石为原料,分别加入Y_2O_3细粉、Y_2O_3和α-Al_2O_3混合粉、钇铝石榴石前驱体,制备尖晶石-钇铝石榴石复相材料。研究了氧化钇的不同引入方式和烧结温度对尖晶石-钇铝石榴石复相材料烧结性能的影响,并通过XRD、SEM等手段对其物相组成和显微结构进行表征。结果表明:向富铝尖晶石中分别加入Y_2O_3细粉、Y_2O_3和α-Al_2O_3混合粉、钇铝石榴石前驱体,均能制备出尖晶石-钇铝石榴石复相材料;当Y_2O_3和α-Al_2O_3混合粉的加入量为6%,经1750℃烧结3 h后,所制备的试样的致密化程度较高,体积密度达3.34 g/cm3,显气孔率为8.0%,制备的试样中镁铝尖晶石、钇铝石榴石晶粒发育较好。

MA-YAG composites were prepared using alumina rich spinel as raw material and Yttrium aluminum garnet as raw precursor,adding Y_2O_3 powder,Y_2O_3and alpha Al2O3 mixed powder. The effects of different sources of Yttrium and sintering temperatures on the properties of MA-YAG composites were investigated. The phase constitution and microstructure of the samples were characterized by XRD and SEM. The results indicate that MA-YAG composites can be synthesized by adding Y_2O_3 powder,Y_2O_3and alpha Al2O3 mixed powder or YAG precursor respectively to alumina rich spinel. The sample with 6wt% Y_2O_3 and alpha Al2O3 mixed powder sintered at 1750 ℃ possesses higher bulk density( 3. 34 g / cm3),lower apparent porosity( 8. 0%),and better grain growth of MA and YAG.