The production process of tungsten copper alloy

The production process of tungsten copper alloy:
The technical process of preparing tungsten-copper alloy by powder metallurgy method is used for mixing, limiting, forming, sintering, melting, infiltration and cold production of powdered ingredients. Tungsten-copper or molybdenum-copper mixed powder is sintered in liquid phase at 1300-1500° after confinement molding. The material prepared by this method has poor uniformity, there are many closed spaces, and the fine density is generally lower than 98%. It can improve the sintering activity and improve the fineness of tungsten-copper and molybdenum-copper alloys. However, nickel activation and sintering will significantly reduce the electrical and thermal conductivity of the material, and the introduction of impurities in mechanical alloying will also reduce the material’s conductivity; the oxide co-recovery method to prepare powders has a cumbersome technical process and low processing power, making it difficult to batch process.
1. Injection molding method High-density tungsten alloy is made by injection molding method. Its production method is to mix nickel powder, copper tungsten powder or iron powder with a uniform particle size of 15 microns, tungsten powder with a particle size of 0.52 microns and tungsten powder of 515 microns, and then mix in 25% 30% organic binder ( Such as white wax or polymethacrylate) injection molding, steam cleaning and irradiation to remove the binder, and sintering in the medium to obtain high-density tungsten alloy.
2. Copper oxide powder method Copper oxide powder (mixing and grinding to restore copper) instead of metal copper powder, copper alloy forms a continuous matrix in the sintered compact, and tungsten is used as a strengthening framework. The high swelling component is limited by the surrounding second component, and the powder is sintered in lower temperature humidity. The selection of very fine powder can improve the sintering performance and densification, making it more than 99%.
3. The tungsten and molybdenum skeleton infiltration method firstly confines the tungsten powder or molybdenum powder to shape, and sinters it into a tungsten and molybdenum skeleton with a certain porosity, and then infiltrates copper. This method is suitable for tungsten copper and molybdenum copper products with low copper content. Compared with tungsten copper, molybdenum copper has the advantages of small quality, simple production, linear expansion coefficient, thermal conductivity and some major mechanical properties and tungsten copper. Although the heat resistance function is not as good as that of tungsten copper, it is better than some heat-resistant materials, so it has a better prospect of use. Because the wettability of molybdenum-copper is worse than that of tungsten-copper, especially when preparing molybdenum-copper with low copper alloy content, the fine density of the material after infiltration is low, resulting in the material’s air tightness, electrical conductivity, and thermal conductivity cannot meet the requirements. Its use is restricted.