用球化处理的粉末热压制备Cu-Al_2O_3复合材料  

Cu-Al_2O_3 composite fabricated by hot pressing with sphericized powder

作　　者：刘向兵[1] 贾成厂[1] 王富祥[2] 盖国胜[2] 陈晓华[1] 

机构地区：[1]北京科技大学材料科学与工程学院粉末冶金研究所,北京100083 [2]清华大学材料科学与工程系粉体工程研究所,北京100084

出　　处：《粉末冶金技术》2007年第2期129-134,共6页Powder Metallurgy Technology

摘　　要：由机械合金化法(MA)制得纳米Al2O3颗粒弥散镶嵌于较软微米Cu颗粒表面的复合粉,利用球形化工艺改善所制得复合粉的形貌及工艺性能,然后通过热压法制备Cu-Al2O3复合材料。通过电导率测试、抗拉强度测试、密度测试、SEM形貌和断口分析、微区成分分析,研究了Al2O3质量分数分别为0%、0·5%、1·5%、2·5%时Cu-Al2O3复合材料的组织和性能。结果表明,随Al2O3质量分数增加,材料的抗拉强度总体增加,电导率、伸长率总体降低,Al2O3质量分数在1·5%时制得的复合材料具有较高的综合性能,此时σb=298MPa、δ=12·1%、电导率为88%IACS;质量分数继续增加会使纳米Al2O3颗粒发生局部团聚;在拉伸受力时复合材料发生延性断裂。Firstly, the composite powder that nano- Al2O3 particle is dispersed in micro copper matrix was prepared by mechanical alloying （MA）. Secondly, the shapes and process properties of composite powder were improved by sphericizing process. Thirdly, the nanometer Cu-Al2O3 composite was fabricated by hot pressing. The microstructure and properties of composite samples with mass fraction of alumina being 0 96, 0.5 96, 1.5 96, 2.5 96 were studied by the tests of electric conductivity, tensile strength, density, the morphology and fracture analysis. The tensile strength of composite increase and the electric conductivity and the elongation decrease with increasing mass fraction of alumina. The composite with 1.5 % alumina has the best properties, σb = 298MPa, 8 = 12.1% , electric conductivity is 88 % IACS. The nanometer alumina particle has the trend of local agglomeration. The ductile fracture occurs under the tensile stress.

关 键 词：铜基复合材料 机械合金化 球形化 Al2O3强化 

分 类 号：TQ128[化学工程—无机化工]