W-Cu梯度复合材料的制备、组织与性能OA北大核心CSTPCD

The three-layer W-Cu graded composites were prepared by powders mixing and spark plasma sintering,using W and Cu powders in different proportions as the raw materials.The microstructure,interface characteristics,physical properties,mechanical properties,and thermal shock resistance of the W-Cu graded composites at different sintering temperatures were investigated.The results show that,the W-Cu graded composites sintered at 900 ℃ have the high relative density(95％)and retain the original design composition of single layer.The distribution of W and Cu in each graded layer is uniform,and the interface between W and Cu is well combined without diffusion.The mechanical properties of the W-Cu graded composites show the gradient distribution,and the microhardness of the W-40Cu layer is up to HV 136.The fracture is firstly present at the W-40Cu layer in the compression process,and the highest compressive yield strength is 378 MPa.The thermal conductivity of the W-Cu graded composite sintered at 900 ℃ is 202 W·m-1·K-1.After the thermal shock resistance test,the W-Cu gradient composites show the good thermal shock resistance performance without no crack at the interface.