Abstract
In this study, the W (10–20%)–Cu composites were simultaneously fabricated using commercial, graded commercial, and graded jet-milled W powder. The results show that the W–Cu composites prepared with the graded jet-milled W powders have the highest density and best comprehensive performance due to the combined effect of the particle gradation and jet-milling treatment. Particle gradation is employed to increase the packing density of powders, thereby increasing the relative density of the compressed W skeleton, and the rounded powder with narrow particle size distribution after jet-milling treatment is used to reduce the enclosed pores formed during the process of compacting and infiltration. W–Cu composites with a high density of 16.25 g/cm3 can be directly obtained by conventional compacting at a low pressure of 300 MPa and following infiltration.
Highlights
Due to its excellent arc erosion resistance, high thermal conductivity, low thermal expansion, and superior mechanical properties, tungsten-copper (W–Cu) composite is widely used in high-voltage circuit-breakers, heat sink materials, shaped charge liners, etc. [1–6].For heat sink materials, the W content of the W–Cu composite is 80–90 wt%, due to the requirement to match the thermal expansion coefficient of the substrate materials
It is hard to fabricate W–Cu composite with a high W content (>80%) by liquid phase sintering because W and Cu are not mutually soluble
Skeleton with a high relative density, which is a prerequisite for the preparation of W–Cu composite with a high W content by infiltration [7,9]
Summary
The W content of the W–Cu composite is 80–90 wt%, due to the requirement to match the thermal expansion coefficient of the substrate materials. Liquid phase sintering and infiltration are usually used to prepare W–Cu composite [2,4,6–15]. It is hard to fabricate W–Cu composite with a high W content (>80%) by liquid phase sintering because W and Cu are not mutually soluble. For the preparation of W–Cu composite with a high W content by infiltration, there are two problems that need to be solved. During the conventional method, mold pressing, it is hard to obtain a W skeleton with a high relative density, which is a prerequisite for the preparation of W–Cu composite with a high W content by infiltration [7,9].
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