【摘要】 为了确定形成YAG(Y3Al5O12 )的最佳Al2 O3 与Y2 O3 的摩尔比和SiC/YAG陶瓷复合材料的烧结工艺 ,以Al2 O3、Y2 O3 和SiC为原料 ,利用机械混合法和无压烧结工艺研究了SiC/YAG陶瓷复合材料的制备工艺参数 ,并研究了烧结工艺及Al2 O3 与Y2 O3 的摩尔比对材料的物相组成、密度、抗弯强度和维氏硬度的影响规律 .结果表明 ,在烧结过程中由于氧化铝的挥发 ,形成YAG相的铝钇摩尔比并非理论值 1.6 7,而是发生偏离 ,当烧结工艺为 185 0℃ ,30min时 ,形成YAG相的最佳铝钇摩尔比为 1.5 ,材料的抗弯强度为42 4.4MPa ,维氏硬度为 2 1.3GPa更多还原

【Abstract】 In order to define the best mol ratio of Al 2O 3/Y 2O 3 for forming YAG (Y 3Al 5O 12 ) and the best sintering process for making SiC/YAG ceramic composite, the preparation processes have been studied using mechanical mixtures of SiC with Al 2O 3 and Y 2O 3 powders under pressureless sintering. The effects of sintering process and mol ratio of Al 2O 3 / Y 2O 3 on phase composition, density, flexural strength and HV hardness for the SiC/YAG ceramic composite have been also investigated. The results show that the mol ratio of Al 2O 3/Y 2O 3 for forming YAG is not the theoretical value 1.67, whereas deviates to 1.5 because of the Al 2O 3 volatility under sintering process. The best sintering process is 1 850 ℃ for 30 minutes. The flexural strength of the SiC/YAG ceramic composite is 424.4 MPa, and the HV hardness is 21.3 GPa.更多还原