Tungsten Copper Plate Machining
Tungsten copper plate machining method is powder mixed - pressing - sintering - infiltration routing. Tungsten and copper mixed powder after pressing, sintering at 1300-1500 ° phase. 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, mechanical alloying or oxide reduction method for ultra-fine, nano-powder can improve the sintering activity, thereby increasing tungsten, copper, molybdenum density copper alloy. However, electrical conductivity, thermal conductivity of nickel activated sintering material will significantly reduce the mechanical alloying material will reduce the introduction of impurities conductivity; oxide powder prepared by co-reduction, process cumbersome, low productivity, difficult to mass production.
Wherein the tungsten copper plate specific production methods include the following:
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 milling reduction to copper) rather than metal copper powder, 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 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 into tungsten, molybdenum skeleton has a porosity, then copper infiltrated. This law applies to low copper content of 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 main advantages of tungsten and copper quite.
Although the heat resistance of molybdenum copper are less than tungsten copper, but better than some of the heat-resistant material, and which have better prospects. As copper molybdenum wettability, especially when low copper content of molybdenum copper preparation, lower than the difference between the tungsten copper material after infiltration density, resulting in an airtight materials, electrical conductivity, thermal conductivity, can not meet the requirements, its application is limited.
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