Copper Tungsten Alloy presentation

Copper tungsten alloy powder metallurgy method of preparation of tungsten-copper alloy for the milling process - mixing the ingredients - pressing - sintering dissolved seepage - cold.
Tungsten, copper or molybdenum copper mixed powder after pressing, the liquid phase sintering at 1300-1500 °. Preparation of this legal material is uniformly bad, there are more closed the gap, the density is usually less than 98%, but by adding a small amount of nickel activated sintering method, a mechanical alloying method or an oxide reduction method for ultra-fine, nano-powder can improve the sintering activity, thereby increasing tungsten, Copper Tungsten Electrical Contacts, molybdenum density copper alloy. However, electrical conductivity, thermal conductivity of nickel activated sintering material will significantly reduce the mechanical alloying also reduce the introduction of impurities in the material conductivity; oxide powder prepared by co-reduction, process cumbersome, low productivity, difficult to mass production.
Injection molding
Injection-molded high-density tungsten alloy become. Its manufacturing method is uniform particle size of 1-5 microns nickel powder, copper powder or iron and tungsten particle size of 0.5 micron tungsten powder and tungsten powder mixing 5 to 15 microns, and then entering into the 25% -30 % organic bonding agents (such as paraffin or polymethyl methacrylate vinegar) injection molding, using steam cleaning and irradiation in addition to the binder, sintering in hydrogen, to obtain high-density tungsten alloy.
Copper oxide method
Copper oxide (mixing and grinding restore to Copper tungsten material) instead of metal copper, copper continuous matrix is formed in the sintered compacts, tungsten as strengthening the framework. Subject to the high expansion component around the second component, powder sintering at a lower temperature wet hydrogen. According to reports, the use of a very fine powder can improve the sintering properties and densification to reach more than 99%.
Tungsten, molybdenum skeleton Infiltration
First tungsten powder or molybdenum powder pressing and sintering tungsten, molybdenum skeleton has a porosity and infiltration copper. This method is suitable for low copper content tungsten copper, molybdenum copper products. Compared with tungsten, copper molybdenum copper, with a small mass, easily processed, linear expansion coefficient, thermal conductivity and mechanical properties of some of the major copper and tungsten considerable advantages.
It is the use of high-purity tungsten copper tungsten metal powder excellent characteristics and high purity copper powder plasticity, high electrical conductivity, etc., through the static pressure molding, high temperature sintering, melting refined copper infiltration process of composite materials. Breaking arc performance, good thermal conductivity, low thermal expansion, high temperature does not soften, high strength, high density, high hardness.