Copper tungsten rod (WCu) is the composite of tungsten and copper which own excellent performance of tungsten and copper. It is used widely in such industries as engine, electric power, electron, metallurgy, spaceflight and aviation.

Tungsten copper rod is a kind of round rod. Tungsten copper rod is a kind of composite material, which is manufactured by high-purity tungsten powder and high conductivity copper powder with the production process of isostatic pressing, sintering temperature and copper infiltrated

The manufacturing process is as follows: press the refractory metal, sinter the pressed compact at a high temperature, and infiltrate it with copper. All this is done under very closely controlled conditions. The result is a relatively hard material with superior arc and wear resistance, high physical Properties: at elevated temperatures, and good electrical and thermal conductivity.

Tungsten Copper Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-copper.com
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The causes of tungsten points’ ablation of car distributor as seen below:

7. Soft spring of tungsten points’ arm of distributor. If the tungsten points’ arm spring is much too soft, when the car operating at low speeds, the flashover condition remain normal; due to the high speed inertia effect of the engine, tungsten points’ closure is more slower when the car is operating at a high speed, and the off-fire phenomenon will occur, therefore, the car's exhaust pipe will issue a irregular sound like "sudden, sudden, sudden". Besides, tungsten points will appear rebound phenomenon after closing, and the appearance of spark will be more vulnerable, ultimately tungsten points will be ablated.

8. The ground capacitor is bad. Due to the weak spark, the flashover distance is shorter when test fire, therefore, when the engine is operating at no load, it will be more normal. But the car is instable in operation process, the carburetor will appear tempering phenomenon, and when the engine is working at high speeds, the exhaust pipe will sometimes shoot. So the arcs of tungsten points will increase, and ablate tungsten points eventually.

 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
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Copper tungsten alloy product is a sintered copper tungsten material manufactured by powder metallurgy. It forms dense composite offering hardness, wear resistance and a high softening temperature of tungsten combined with the good electrical conductivity of copper.

Copper tungsten alloy product is a pseudo-alloy of copper and tungsten. As copper and tungsten are not mutually soluble, the material is composed of distinct particles of one metal dispersed in a matrix of the other one. The microstructure is therefore rather a metal matrix composite instead of a true alloy.

The material combines the properties of both metals, resulting in a material that is heat-resistant, ablation-resistant, highly thermally and electrically conductive, and easy to machine.

Parts are made from the CuW alloy by pressing the tungsten particles into a desired shape, sintering the compacted part, then infiltrating with molten copper. Sheets, rods and bars of the alloy are available as well.

Commonly used copper tungsten alloy contains 10–50 wt.% of copper, the remaining portion being mostly tungsten. The typical properties of the alloy depend on its composition. The alloy with less wt.% of copper has higher density, higher hardness and higher resistivity. The typical density of CuW90 alloy, with 10% of copper, is 16.75 g/cm3 and 11.85 g/cm3 for CuW50 alloy. CuW90 has higher hardness and resistivity of 260 HB kgf/mm2 and 6.5 µΩ.cm than CuW50.

Copper tungsten may be used as an electrical contact material. In the most severe applications associated with power generation and transmission the switch may be totally immersed in oil. In these cases there is no advantage in using the tarnish resistant silver-based materials, as oxidation is prevented by the exclusion of air. Copper tungsten contacts are widely used in these cases, the selection of the grade used being dependent on the relative importance of conductivity and arc resistance.

Tungsten Copper Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-copper.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
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The reasons of tungsten contacts ablation of car distributor as shown below:

7. The spring of tungsten contacts’ arm of distributor is too soft. If the tungsten contacts’ arm spring is too soft, flashover situation is still normal when the car running at low speeds; but when the car is working at a high speed, because of the high speed inertia effect of the engine, the closure of tungsten contacts is more slower, which appears off-fire phenomenon, so the car's exhaust pipe will issue a "sudden, sudden, sudden" irregular sound. Moreover, tungsten contacts after closure will appear rebound phenomenon, and the phenomenon make spark more vulnerable to emerge, and eventually tungsten contacts will be ablated.

8. Bad ground capacitor. When test fire, due to the spark is weak, and flashover distance is shorter, so the engine will be more normal when it is operating at no load. However, the car in working process is of instability, which would make carburetor appearing tempering phenomenon, and the exhaust pipe sometimes shooting when the engine is working at high speeds, make the arcs of tungsten contacts increase, eventually ablate tungsten contacts.


 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
 Tel.: 86 592 5129696; Fax: 86 592 5129797
 Email: sales@chinatungsten.com
 Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
 Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
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