La2O3含量对Al2O3/Cu基复合材料组织与性能的影响

Effect of La2O3 Content on Microstructure and Properties of Al2O3/Cu Matrix Composites

以La2O3粉、Al粉、CuO粉为反应物原料,纯铜为基体,采用原位合成技术和近熔点铸造法制备颗粒增强Cu基复合材料,研究La2O3对Al-CuO体系制备的Cu基复合材料组织及性能的影响。结果表明:添加La2O3可获得纳米Al2O3颗粒,且弥散分布于Cu基体中,制备的材料组织更加细小、均匀,其材料的电导率及耐摩擦磨损性能得到明显提高。当添加0.6%La2O3(质量分数),复合材料的电导率达到90.7%IACS,磨损量达到最小,相比未添加La2O3,其导电率提高10.1%,磨损量减小36.3%。

Using La2O3 powder,Al powder,CuO powder as raw materials and pure copper as matrix,particle-reinforced Cu matrix composites were prepared by in-situ synthesis technology and near melting point casting method.The effect of La2O3 content on the microstructure and properties of Cu matrix composites prepared by the Al-CuO system was studied.The results show that nano-Al2O3 particles can be obtained by adding La2O3,which are dispersed in the Cu matrix.The structure of the prepared material is finer and more uniform,and its electrical conductivity and wear performance are significantly improved.When 0.6%La2O3(mass fraction)is added,the electrical conductivity of the composite reaches 90.7%IACS,and the amount of wear reaches the minimum.Compared with those of the material without adding La2O3,the electrical conductivity increases by 10.1%,and the amount of wear decreases by 36.3%.