Al_2O_3-Ni网状复合材料的制备及力学性能  

Fabrication and Properties of Al_2O_3-Ni Network Composites

作　　者：张芳[1] 王介强[1] 徐家桢[1] 孙旭东[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2001年第4期420-422,共3页Journal of Northeastern University(Natural Science)

基　　金：教育部'跨世纪优秀人才培养计划基金'资助项目

摘　　要：以α Al2 O3超微粉和羰基Ni粉为原料 ,采用热压方法制备了Al2 O3 Ni网状复合材料 ,并对其三点弯曲强度和断裂韧性进行了研究·结果表明 ,随Ni体积分数的增加复合材料的强度稍有下降 ,而断裂韧性明显增加·Ni体积分数为 2 0 %时 ,断裂韧性可达 8 8MPa·m1/ 2 ·复合材料对缺陷的敏感性远远小于氧化铝陶瓷 ,在材料表面引入载荷为 1 0 0N的维氏硬度压痕后 ,氧化铝陶瓷的强度下降 60 % ,而Ni体积分数为 2 0 %的复合材料强度仅下降 1 9% ·Al 2O 3 Ni composites with network microstructure were fabricated from ultrafine α Al 2O 3 and carbonyl nickel powders by hot pressing method. Three point bending strength and fracture toughness of the composites were investigated. With the increase of Ni volume fraction, three point bending strength decreases slightly and fracture toughness increases significantly. Fracture toughness of the composite containing 20%Ni is 8 8?MPa·m 1/2 . The composites are much less sensitive to defects than the alumina ceramics. After introduction of a Vickers indentation under a load of 100?N, the strength is reduced 60% for the alumina ceramics, while that of the Al 2O 3 20%Ni composite is reduced only 19%.

关 键 词：三氧化二铝-镍网状复合材料 Al2O3-Ni网状复合材料 强度 断裂韧性 制备 

分 类 号：TB332[一般工业技术—材料科学与工程]