Research Of The Structure And Technology Of W-Cu Composite Which Prepare By High-energy Ball Milling

The tungsten-copper composite is a kind of pseudo-alloy, which composed by copper and tungsten. Tungsten component have the quality of high melting point and high hardness and the copper component have the quality of high electric and thermal conductivity. With the performance of resistance against electric arc erosion , fusion welding , high degree of hardness and intensity, the W-Cu composite material was widely used in electric contacting material, electric resistance welding, electric spark manufacture, plasma electric pole material, electrothermal alloy and high density alloy, special lathe-hand material (such as air spout in rocket, throat-substrate in plane), central processing system in computer, leading wire frame in large scale compound integration, solid-stated microwave tube, etc.With the rapid development of science, all kinds of W-Cu composite material require higher and higher performance. Because Tungsten and copper do not dissolve each other, the preparation of W-Cu composite material needs many other special methods. The material which possesses extremely high density (even nearly fully density) and so much high conduction of electricity and thermal that can not be possessed by normal methods. In this research, W-15Cu nanocomposite powder and high-performance W-Cu nanocomposite were successfully prepared by high-energy ball milling and special sintering method. In this picture the W-Cu nanocomposite powder which prepared by high-energy ball millingwas be investigated, and the structure of the powder was analyzed. The effect of ball milling time on W-Cu nanocoposite powder was emphasized in the research too. The W-Cu nanocoposite was characterized by the SEM, and the morphology showed that the tungsten powder and copper powder are homogenously mixed each other, the copper's average granularity was 0.3um. Calculated by the XRD ,the research found that the undersaturation solid solutions was generated in the ball milling, because the tungsten partly dissolve in copper particle, and the average grain size of tungsten and copper were reduced to 39.7nm and 31.5nm.At the same time, the relationship between technology and relative density of W-Cu nanocomposite has been detailed investigated. The effect of ball milling time, sintering temperature, forming pressure, sintering time, time of hypothermia insulation, and speed of the of heating-up of hypothermia on density of W-Cu nanocomposite were researched in this article, and the mechanism was be analyzed simply too. Fully density of W-Cu nanocomposite can not be obtained by traditional methods, but in this research, fully density of W-Cu nanocomposite was obtained by the use of "high-energy ball milling powder, consolidation and pressureless-liquid phase sintering" method. The density of this composite attains to 16.273g/cm~3, and its tungsten's average grain size is about 1um. The research provides some experimental foundations and bases for the industrialization and application of high quality W-Cu nanocomposite.