Classification and application of tungsten-copper alloy electrode
Tungsten-copper alloy electrode is a kind of composite metal material which is made of high purity tungsten powder and high purity, high plasticity and high conductivity copper powder, and is refined by static pressing molding, high temperature sintering and melting process.Good electrical conductivity, small thermal expansion, no softening at high temperature, high strength, high density, high hardness.
classification
Resistance welding electrode
The good performance of tungsten and copper, high temperature resistance, arc ablation resistance, high strength, than significant, good electrical and thermal conductivity, easy to process, and its functions such as sweat, with tungsten high hardness, high melting point, anti-adhesion characteristics, often used to do a certain wear resistance, high and low temperature resistance welding, butt-welding electrode.
EDM electrodes
Early EDM electrodes were made of copper or graphite, which were cheap but not ablative. The advantages of tungsten copper electrode are high temperature resistance, high temperature strength, arc ablation resistance, and good electrical and thermal conductivity, fast heat dissipation. Applications are concentrated in electrical spark electrodes, resistance welding electrodes and high voltage discharge tube electrodes. Electro-processing electrodes are characterized by a wide variety of specifications, small batch and large amount. The tungsten-copper materials used as electro machining electrodes should have the highest density and homogeneity of tissue as possible, especially the slender rod, tube and special-shaped electrodes.
During the long period of EDM development, copper and copper alloys were widely used as machining electrodes. Although copper and copper alloy are cheap and convenient to use, the copper and copper alloy electrode is not resistant to EDM ablation, resulting in large electrode consumption and poor machining accuracy (sometimes multiple processing is required).With the increasing of the precision of the die and the increasing of the amount of many difficult parts, and the maturing of the EDM technology, the amount of tungsten and copper as the electrode in EDM is increasing day by day. Using tungsten-copper electrode, not only makes the precision of the molds and parts to be processed, but also the electrode loss is small, high processing efficiency, and even one can complete the product rough machining and finishing machining. The characteristics of EDM electrode are variety and specification, small batch and large total amount. Especially some slender rod, pipe material and special-shaped electrode, if the conventional method is used to make, the process is very complicated, the material utilization rate is very low.
In view of the tungsten steel, high temperature resistant super hard alloy die casting is produced by corrosion, common electrode loss, slow speed, tungsten copper electrical high speed, low loss rate, accurate electrode shape, excellent processing performance corrosion, to ensure that the precision of processing workpiece greatly improved.
High voltage discharge tube electrode
High-voltage vacuum discharge tube in the workplace, in a few seconds of time contact material zero degrees thousands of degrees Celsius, and tungsten copper ablation resistance, high toughness, good electrical and thermal conductivity to provide the necessary stable conditions for the discharge tube.
Tungsten-copper alloys are necessary for applications that combine high heat resistance, high electrical and/or thermal conductivity and low thermal expansion. Parts are used in resistance welding, as electrical contact, and as radiators. Resistance to arc erosion due to alloy contact material. Tungsten-copper alloys are also used in EDM and electrochemical machining of electrodes. CuW75 is widely used in hot mounting plates, chip carriers, flanges, and high power electronic device frames. As a composite material of tungsten and copper, it has the excellent characteristics of thermal property and low expansion of copper.
Because of its thermal conductivity and expansion properties, tungsten-copper alloy is widely used in dense packing circuits.70-90% of the tungsten alloy is used in some special shape products. The permeability coefficient of 1.3 enhances the homogenous steel target for copper because of the increase in both density and rupture time. Tungsten powder type gasket, especially suitable for oil drilling. Other ductile metals can be used as places for copper and adhesives. Graphite can be added with lubricant powder.
Type 70 W30Cu
70W30Cu type tungsten-copper alloy electrode is a composite material made of the excellent metal properties of high purity tungsten powder and the plasticity and high conductivity of high purity copper powder. It is refined by the process of static pressing, high temperature sintering and copper dissolution.
Type 75 W25Cu
As a composite material of tungsten and copper, 75W25Cu tungsten-copper alloy electrode has the excellent characteristics of thermal property and low expansion of copper. The 75%W tungsten-copper alloy electrode is characterized by high heat resistance, high thermal conductivity and low expansion. Therefore, the 75%W tungsten-copper alloy electrode is often used in resistance welding, electrical contact and radiators.
Type 80 W20Cu
The tungsten content of 80W20Cu tungsten-copper alloy electrode is 80%. The grade is CuW80. The hardness of CuW80 is about 98HRB and the density is about 15.58g/cm3.The thermal expansion properties of tungsten-copper composites are similar to those of silicon carbide, alumina and beryllium oxide, and they are used in substrates and chips.
Type 85 W15Cu
85W15Cu type tungsten-copper alloy electrode is a kind of two-phase structure false alloy which is mainly composed of tungsten and copper elements. It is a metal matrix composite material. Because the physical properties of copper and tungsten are different, it is not possible to use the casting method for production, but the powder alloy technology is generally used for production.
