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用粉末冶金方法制备了Cu-Al2O3/Cr复合材料,研究了压制力(200、250、300、350 MPa)对烧结件显微组织的影响以及该复合材料的密度、硬度、导电率的变化。结果表明,随着压制力的增大,Cu基体中的孔隙尺寸明显变小,Cr相晶粒尺寸变小并趋于均匀,而且Cu-Al2O3/Cr复合材料的密度和导电率都快速增加,复合材料的硬度在压制力从200 MPa增加到300 MPa时,材料的硬度增加比较缓慢,继续增压,材料的硬度增加明显较快。
Cu-Al2O3 / Cr composites were prepared by powder metallurgy. The effects of compressive force (200, 250, 300 and 350 MPa) on the microstructure of the sintered parts and the changes of density, hardness and electrical conductivity of the composites were investigated. The results show that with the increase of pressing force, the pore size of Cu matrix becomes smaller obviously, the grain size of Cr phase becomes smaller and tends to be uniform, and the density and conductivity of Cu-Al2O3 / Cr composites increase rapidly, The hardness of the composites increased slowly when the compressive force increased from 200 MPa to 300 MPa, and the hardness of the composites increased slowly. The hardness of the composites increased obviously and rapidly.