添加La_2O_3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

EFFECTS OF La_2O_3 ADDITION ON STRUCTURE AND FORMING PROPERTY OF LASER SINTERED (WC-Co)_p/Cu METAL MATRIX COMPOSITES

研究了稀土氧化物La_2O_3添加量对激光烧结直接成形(WC-10Co)颗粒增强Cu基复合材料的影响.结果表明,优化La_2O_3含量(1.0%),可细化激光烧结组织,提高增强颗粒分散均匀性以及颗粒/基体界面结合性能,成形致密度高达理论密度的96.3%,显微硬度HV可达403.1;而过量添加La_2O_3((?)1.5%),导致激光成形性能降低.讨论了稀土原子对颗粒增强金属基复合材料激光烧结成形的作用机理.

The effects of rare earth oxide （La2O3） contents on direct laser sintered WC-10Co particulate reinforced Cu matrix composites were investigated. By addition of 1.0%La2O3 the sintered structure can be refined, the reinforcing particulates are homogenized and the particulate/matrix bonding is improved, leading to a high density of 96.3% of the theoretical density and a high microhardness of HV 403.1. However, an excessive addition of La2O3 （≥1.5%） results in a decrease in the laser sintering ability. The effective mechanisms of rare earth material in laser sintered composite were discussed.