Tungsten Carbide Copper
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Tungsten carbide composites can be used as dies and anvils in electrical upsetting.
Tungsten Copper Carbide is a refractory Tungsten-based composite obtained by the process of pressing, sintering and infiltrating. The Tungsten content ranges from 50% to 70% by weight. This strong material has good mechanical properties and is highly resistant to arc erosion in contact welding. It is mainly used in oil devices to protect the contact from oxidation.
CuWC50 and CuWC56 grades have excellent resistance to mechanical wear and are mainly used for electrical contacts. CuWC50, with higher copper content and electrical conductivity, is used in heavy duty contactors and transfer switches. CuWC56, higher in strength, is used where high impact forces may be encountered and greater wear resistance is desired, such as tap changers and arcing contacts in oil breakers.
Due to its high hardness and strength, CuWC70 is used in more severe electrical upsetting and electro forging applications.
2013年5月22日星期三
Tungsten-Copper Composite
Tungsten-Copper Composite
Tungsten based composites are strong refractory metal materials manufactured by a strictly controlled process involving pressing, sintering and infiltrating with copper or silver. They are highly resistant to heat, electric arc, wear and deformation at high temperature welding, flash butt and spot welding. They also have excellent electrical and thermal conductivity. The properties of Tungsten composites are related to the copper/silver-to-Tungsten ratio. If the Tungsten content improves, the electric arc and wear resistance will increase while the thermal and electrical conductivity, on the contrary, reduce.
Due to their unique properties, Tungsten based composites are widely used where the combination of good electrical and/or thermal conductivity and low thermal deformation is necessary, for example:
In electric resistance welding as electrical contacts or heat sinks.
In electrodes for electrical discharge machining (EDM) and electrochemical machining (ECM).
Tungsten based composites are strong refractory metal materials manufactured by a strictly controlled process involving pressing, sintering and infiltrating with copper or silver. They are highly resistant to heat, electric arc, wear and deformation at high temperature welding, flash butt and spot welding. They also have excellent electrical and thermal conductivity. The properties of Tungsten composites are related to the copper/silver-to-Tungsten ratio. If the Tungsten content improves, the electric arc and wear resistance will increase while the thermal and electrical conductivity, on the contrary, reduce.
Due to their unique properties, Tungsten based composites are widely used where the combination of good electrical and/or thermal conductivity and low thermal deformation is necessary, for example:
In electric resistance welding as electrical contacts or heat sinks.
In electrodes for electrical discharge machining (EDM) and electrochemical machining (ECM).
2013年5月7日星期二
Copper Tungsten Applications
CuW alloys are used where the combination of high heat resistance, high electrical and thermal conductivity, and low thermal expansion are needed. Some of the applications are in electric resistance welding, as electrical contacts, and as heat sinks. As contact material the alloy is resistant to erosion by electric arc. WCu alloys are also used in electrodes for electrical discharge machining and electrochemical machining.
The CuW75 alloy, with 75% of tungsten, is widely used in chip carriers, substrates, flanges and frames for power semiconductor devices. The high thermal conductivity of copper together with the low thermal expansion of tungsten allows thermal expansion matching to silicon, gallium arsenide, and some ceramics. Other materials for this applications are CuMo alloy, AlSiC, and Dymalloy.
Alloy with 70-90% of tungsten is used in liners of some specialty shaped charges. The penetration is enhanced by factor 1.3 against copper for homogeneous steel target, as both the density and the break-up time are increased. Tungsten powder based shaped charge liners are especially suitable for oil well completion. Other ductile metals can be used as binder in place of copper as well. Graphite can be added as lubricant to the powder.
The CuW75 alloy, with 75% of tungsten, is widely used in chip carriers, substrates, flanges and frames for power semiconductor devices. The high thermal conductivity of copper together with the low thermal expansion of tungsten allows thermal expansion matching to silicon, gallium arsenide, and some ceramics. Other materials for this applications are CuMo alloy, AlSiC, and Dymalloy.
Alloy with 70-90% of tungsten is used in liners of some specialty shaped charges. The penetration is enhanced by factor 1.3 against copper for homogeneous steel target, as both the density and the break-up time are increased. Tungsten powder based shaped charge liners are especially suitable for oil well completion. Other ductile metals can be used as binder in place of copper as well. Graphite can be added as lubricant to the powder.
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