Al_2O_3/WC-8Co纳米/微米复合材料显微结构与力学性能  

Mechanical properties and microstructure of Al_2O_3/WC-8Co nanometer/micron composites

作　　者：杨眉[1,2] 刘清才[1] 黄志强[2] 刘清友[2] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]西南石油大学材料科学与工程学院,四川成都610500

出　　处：《煤炭学报》2010年第3期494-497,共4页Journal of China Coal Society

基　　金：国家自然科学基金资助项目(50372054)

摘　　要：为研究纳米Al2O3粒子对WC-8Co组织结构与力学性能的影响,在微米WC-8Co中掺杂纳米Al2O3粒子制备了Al2O3/WC-8Co纳米/微米复合材料,进行了烧结密度、抗弯强度、显微硬度、冲击韧性以及耐磨性等常温力学性能测试,应用SEM进行了显微结构分析。结果表明:掺杂3%纳米Al2O3及0.8%RE的Al2O3/WC-8Co纳米/微米复合材料的力学性能显著提高,特别是磨损失重较WC-8Co降低了约10/11,组织得到明显细化,断口呈韧性断裂特征,断裂机理为微孔聚集型。Al2O3/WC-8Co nanometer/micron composites,doped nanometer Al2O3 into micron WC-8Co,were prepared to investigate the effects of nanometer Al2O3 particles on the mechanical properties and microstructure of WC-8Co.Density,bending strength,micro-hardness,impact toughness and wear resistance of the composites were tested,and microstructure was characterized by means of scanning electron microscopy（SEM）.The results show that mechanical properties of the composite doping 3% nano Al2O3 and 0.8% RE are improved,especailly its weight-loss decreases about 10/11 of WC-8Co.The grain of Al2O3/WC-8Co nanometer/micron composite is apparently refined,the fracture mechanism is microvoid coalescence fracture because the fractography is tough fracture.

关 键 词：纳米/微米复合材料 掺杂 力学性能 组织结构 

分 类 号：P634.4[天文地球—地质矿产勘探]