Study On Densification Process And Structure Of W-Cu Composite

Tungsten-copper composite is one kind of the pseudo-alloy, which is consisted of copper and tungsten. Tungsten component has high melting temperature as well as high hardness and the copper component has the good conductivity for electric and thermal. Due to the good erosion resistance and fusion welding performance, high hardness and strength, so far W-Cu composite has been widely used in the fields of electric materials, electron, military equipment industry and spaceflight. With the rapid development of technology, the need for higher grade W-Cu composites material is increasing. Owing to what tungsten and copper does not dissolve each other, the production of W-Cu composite material needs the specific approach and the special process. The material made by tungsten-copper nano-composite powder has higher density (even nearly fully density), better conductivity of electric and thermal that are not achieved by other traditional method. In this study, the W-15Cu compostie material is successfully produced by MA with heat-press sintering and non-press sintering , which shows the good performance in test.The powder of W-Cu nano-composite is made by the approach of MA herein and the structure and morphology of these powder are studied with the various milling time. It was showed that while the time of MA is prolonged, the granularity and the distribution as well as the solid solubility of W-Cu composite powder can be much better. Moreover, orthogonal test is done among the producing approach, the relative density and the structure of W-Cu composite material. The influences of milling time, forming pressure, sintering pressure, heat retaining time at low temperature and sintering time on density of W-Cu composite are studied. The mechanism was analyzed simply. In this paper, W-Cu composite was made by hot-press sintering and non-press sintering. The densification, microstructure and morphology of these material are examined . It is showed that the relative density of material can be achieved up to 98.8% and 98.25 % respectively, the microstructure and the solid solubility are good too. The mean size of tungsten grain is about 1μm. The study can be by referred by the industrialization and the application of this specific material.