Effect of rare earth oxide addition on microstructures of ultra-fine WC-Co particulate reinforced Cu matrix composites prepared by direct laser sintering

摘要: Abstract This paper presents a detailed investigation into the influence of rare earth (RE) oxide (La2O3) addition upon densification and resultant microstructural characteristics submicron WC–Co particulate reinforced Cu matrix composites prepared by direct laser sintering. It is found that relative density sintered sample with 1 wt.% La2O3 increased 11.5% as compared without RE addition. The element favored refinement improved dispersion homogeneity particulate/matrix interfacial coherence. metallurgical functions in improving sinterability were also addressed. shows due to unique properties such high surface activity large atomic radius, trace can decrease tension melt, resist grain growth coarsening increase heterogeneous nucleation rate during