Spiral Of Tungsten Copper Alloy Forging

W-Cu composites have been used widely in the fields of electrical materials, electron war industry and spaceflight due to their high strength and hardness, good electrical and erosion resistance. However, because of the mutual insolubility between W and Cu, it is difficult to get W-Cu materials with high relative density by traditional methods of infiltration of a tungsten skeleton with liquid copper and liquid phase sintering. In this paper, a new method to make W-Cu composite with nearly 100%of relatively density has been put forward. That is mixing, compacting, liquid phase sintering and hot hydrostatic extrusion at certain temperature. Preparation of a dense, uniform organization of 90 W-Cu composite materials. To draw the following conclusions:1. Suppression of a two-way steel, can be suppressed to meet the requirements of the 70 W-Cu, 80W-Cu tungsten alloy skeleton, but the 90W-Cu alloy, high-density Tungsten cytoskeleton, the need to suppress the higher pressure, higher Suppression of pressure also requested to suppress die with very high intensity, therefore, prepared by molding it is very difficult to meet the requirements 90 W-Cu tungsten skeleton. 2. For 70 W-Cu, 80W-Cu, 90W-Cu alloy, the composition ratio of different technical parameters will be different. Sintering temperature increase and the extension of sintering, tungsten copper alloy to increase the density, but the excessive sintering temperature and the sintering time is too long, likely to cause large areas of the skeleton of metal enrichment or obturator is not conducive to the back Melting infiltration and eventually the density of tungsten and copper alloy conductivity are not high. Melting temperature is too low permeability, to the detriment of copper in the framework of tungsten in the flow of infiltration melting temperature is too high, copper is likely to cause the volatile; melt infiltration time is too short, copper is not completely filled with tungsten skeleton, melting seepage long time, Easy to form copper pool.3. Fusion of traditional infiltration of law can completely dense 70 W-Cu, 80W-Cu sintering Blank, but the high tungsten content of copper alloy of tungsten, such as the 90 W-Cu alloy, is difficult to melt infiltration of law Completely dense sintered tungsten copper blanks. The experimental production of 90 W-Cu sintering billet density is only 95.6 percent, billet in the sintering there are still more porous.4. It was found that spin through the forging billet heating, Rotary forging processing rate of choice, rotary forging bar the annealing process, and other parameters of the final materials have an important impact on the density and listed in the rotation forging process and the problems which may arise The appropriate solution.5. Through two different spin on the forging process contrast found: Melting seepage after the first rotation of the production process of forging better microstructure, the material in less porous, more uniform distribution of copper, can more effectively enhance the Material density. This article also two of the tungsten production of copper, the tensile strength and elongation of the changes have been studied, results showed that the rotation of forging material strength is not only at the expense of the increase in exchange for the plastic. Analysis of the mechanisms of fracture, the fracture surface fracture that copper is the main form of toughness transgranular fracture of copper and tungsten phase and between the crystal along the fault.