【摘要】 含2%(摩尔分数)Y2O3的ZrO2(简称TZP(2Y))和3%(摩尔分数)Y2O3的ZrO2(简称PSZ(3Y))分别以15%(体积分数)添加到Al2O3基体中,经1550℃真空烧结。实验表明,Al2O3复合材料的性能均高于单相Al2O3陶瓷,并且Al2O3/PSZ(3Y)的抗热震性优于Al2O3/TZP(2Y)。提高改善复合材料的抗热震性是ZrO2(Y2O3)多种增韧机制的作用。理论计算表明,Al2O3陶瓷和Al2O3/TZP(2Y),Al2O3/PSZ(3Y)复合材料的断裂功分别为38,100.8,126.2J·m-2。Al2O3/TZP(2Y)和Al2O3/PSZ(3Y)复合材料的裂纹萌生阻力是Al2O3陶瓷的1.41倍和1.57倍,而裂纹扩展阻力是Al2O3陶瓷的1.38倍和1.46倍,与热震实验残余强度的结果一致。更多还原

【Abstract】 ZrO₂ containing 2% （mol fraction） Y₂O₃ and 3% （mol fraction） Y₂O₃ were added into Al₂O₃ matrix, compositing composites with 15% volume fraction of additives mentioned above. The testing of property and analysis of SEM presented that, after vacuum sintering at 1550 ℃, thermal shock resistance of two composites is superior to Al₂O₃ ceramic. The experiment shows that the properties of Al₂O₃ composites is higher than Al₂O₃ ceramic, and Al₂O₃/PSZ（3Y）is higher than Al₂O₃/TZP（2Y） in thermal shock resistance. Improvement of thermal shock resistance of composites is attributed to many toughness machanisms of ZrO₂（Y₂O₃）. By calculation the fracture energy of Al₂O₃, Al₂O₃/TZP（2Y）, Al₂O₃/PSZ（3Y）is 38, 100.8 and 126.2 J·m^-2, respectively. R′ of Al₂O₃/PSZ（3Y） and Al₂O₃/TZP（2Y） is higher than Al₂O₃ ceramics by 1.57 and 1.41 time respectively, and （R″″） is higher than Al₂O₃ ceramics by 1.46 and 1.38 time respectively, which is corresponding to the results of residual strength.更多还原