采用无压烧结成型工艺,研究了氧化物杂质(碱金属、碱土金属氧化物及SiO2)对Al2O3陶瓷力学性能与抗蠕变性的影响,并利用扫描电子显微镜以及万能试验机表征样品的微观结构和力学性能;提出一种恒压试样的方法评价材料的蠕变性,测试恒压后标准试样的弯曲程度.结果表明:氧化物杂质对Al2O3陶瓷常温力学性能和高温蠕变性影响存在很大差异,常温力学性能方面,除MgO外,所研究的其它氧化物杂质均使材料抗弯强度和断裂韧性有不同程度降低,而MgO能明显提高陶瓷力学性能;另一方面,高温蠕变性受氧化物杂质影响则表现相反,MgO会导致材料抗蠕变性下降,其它氧化物杂质或多或少地提高抗蠕变性能,其中含量为1 mol％ SiO2的Al2O3陶瓷抗蠕变性能明显提高.
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