EFFECT OF La2O3 ON LASER SINTERING OF WC-CoP/Cu METAL MATRIX COMPOSITES
添加La2O3对激光烧结(WC-Co)p/Cu金属基复合材料组织和成形性能的影响

The effect of rare earth oxide (La2O3) contents on direct laser sintering of WC-10Co particulate reinforced Cu matrix composites was investigated. It shows that using an optimal La2O3 content of 1.0% can refine the laser sintered structure, homogenize the dispersion of reinforcing particulates and improve the particulate/matrix bonding coherence, leading to a high densification of 96.3% theoretical density and a high microhardness of HV0.1403.1. However, an excessive addition of La2O3 above 1.5% results in a decrease in the laser sintering ability. The metallurgical mechanisms of rare earth element in laser sintering of particulate reinforced metal matrix composites were discussed.