不同含量Y_2O_3的ZrO_2对Al_2O_3复合陶瓷热震稳定性的影响  

Effect of Y_2O_3 Contents in ZrO_2 on Thermal Shock Resistance of Al_2O_3 Composites

作　　者：马伟民[1] 修稚萌[1] 闻雷[1] 孙旭东[1] 铁维麟[2] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110004 [2]沈阳大学机械工程学院,辽宁沈阳110044

出　　处：《中国稀土学报》2004年第2期229-233,共5页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金资助项目(50172010)

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。ZrO_2 containing 2% (mol fraction) Y_2O_3 and 3% (mol fraction) Y_2O_3 were added into Al_2O_3 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 Al_2O_3 ceramic. The experiment shows that the properties of Al_2O_3 composites is higher than Al_2O_3 ceramic, and Al_2O_3/PSZ(3Y)is higher than Al_2O_3/TZP(2Y) in thermal shock resistance. Improvement of thermal shock resistance of composites is attributed to many toughness machanisms of ZrO_2(Y_2O_3). By calculation the fracture energy of Al_2O_3, Al_2O_3/TZP(2Y), Al_2O_3/PSZ(3Y)is 38, 100.8 and 126.2 J·m^(-2), respectively. R′ of Al_2O_3/PSZ(3Y) and Al_2O_3/TZP(2Y) is higher than Al_2O_3 ceramics by 1.57 and 1.41 time respectively, and (R″″) is higher than Al_2O_3 ceramics by 1.46 and 1.38 time respectively, which is corresponding to the results of residual strength.

关 键 词：无机非金属材料 Al2O3/PSZ(3Y) 断裂功 相变增韧 抗热震性 稀土 

分 类 号：TQ174.75[化学工程—陶瓷工业]