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

摘要:

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,其材料的电导率及摩擦磨损性能明显提高。当添加0.6%wtLa₂O₃,复合材料的电导率达到90.2%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36.6%。

Abstract:

Using La₂O₃ powder, Al powder, CuO powder as raw materials and pure copper as matrix, in-situ synthesis technology and near melting point casting method were used to prepare particle-reinforced Cu matrix composites.The effect of La₂O₃ on the microstructure and properties of Cu matrix composites prepared by Al-CuO system was studied. The results show that the addition of La₂O₃ can obtain nano-Al₂O₃ particles, which are dispersed in the Cu matrix, and the prepared material structure is more fine and uniform, and its electrical conductivity and wear performance are significantly improved. When added 0.6% wtLa₂O₃, the electrical conductivity of the composite reached 90.2% IACS, and the amount of wear reached a minimum. Compared with the absence of La₂O₃, the electrical conductivity increased by 10.1%,and the wear decreased by 36.6%.