微米SiCp/Cu基复合材料的机械和耐磨性能

Mechanical and Sliding Wear Properties Of Micrometer SiCp/Cu Matrix Composite

以微米级(14mm)SiCp和微米级(10mm)铜粉为原料,采用冷压烧结方法制备出SiCp(14mm)/Cu基复合材料,并进行了热挤压加工。研究了SiCp(14mm)/Cu基复合材料的组织、硬度、导电、拉伸和耐磨性能,并与6-6-3锡青铜进行了比较。结果表明:SiCp(14mm)/Cu基复合材料组织致密,SiCp(14mm)分布均匀;随着SiCp(14mm)含量增加,导电性下降,硬度增高,抗拉强度下降,伸长率下降;在SiCp(14mm)含量为1～10vol%时,导电率为95.9%～82.2%IACS,硬度为84.5～89.2HV,抗拉强度为243.3～166.6MPa,伸长率为50.6%～23.0%;SiCp(14mm)/Cu基复合材料具有良好的耐磨性,5vol%SiCp(14mm)/Cu基复合材料磨损质量损失是6.5-0.4锡青铜1/18.3;SiCp(14mm)对对磨件产生犁削,复合材料磨损表面形成混合中间层,提高了耐磨性。

The electric conductivity, Vickers harness, tensile properties and sliding wear-resistance, of the SiCp/Cu composites with SiCp size of 14mm and volume content (1.0～5vol%) fabricated by powder metallurgy followed by hot extrusion, have been examined in this paper. The results show that the electric conductivity, vickers harness, tensile strength and fracture elongation is respectively about 95.9～82.2%IACS, 84.5～89.2MPa, 243.3～166.6MPa and 50.6～23.0%. The 5vol%SiCp/Cu composites exhibit excellent sliding wear-resistance, which are respectively about 18.3 and 24.7 times of that of popularly used 6-6-3 bronze (Cu-6Sn-6Pb-3Zn) bearing material and of commercially pure copper. [