采用高纯Al2O3粉末为原料,在氢气气氛中烧结了氧化铝透明陶瓷.研究了添加剂MgO和烧结温度对Al2O3透明陶瓷致密化过程、显微结构和性能的影响.实验结果表明,适量掺杂MgO能够抑制晶粒生长,改善烧结性能,提高致密度,0.05%(质量分数)是MgO最佳含量;随着烧结温度的升高,晶粒发育完全,透光率增加,1850℃为最佳烧结温度;在最佳条件下获得的氧化铝透明陶瓷,相对密度为99.72%,平均晶粒尺寸约20μm,总透光率达到93%,显微硬度(HV5)为20.75GPa,抗弯强度达到320MPa.
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