K Doped Tungsten Electrode

It has been a very popular situation for our company that our customers are inquiring a product, whose chemicals are unknown for both sides. The only one our customers know is the material related to tungsten. However, as for the large category of tungsten, it is difficult to provide a suitable material with such information, so that we have to find out a solution for that.

This time, we also encounter the same issue. We get a sample from our clients, and arrange the testing. As for tungsten is a refractory metal, which has been difficult to be used chemical method, we only test in by metal element analyzer. The testing result is that the material is with over 99.85% tungsten. Therefore, we recommend it as pure tungsten or K doped tungsten. 

Most of the customers are familiar with K doped tungsten wire but not electrode, actually K doped tungsten electrode is with the same chemical as the wire and the same properties, which is to decrease the deformation at high temperature. K is doped in the process of reduction from tungsten oxide to tungsten powder, which can assure the mixing result of the powder. During forging, as for the crystal of K is larger than tungsten, they are kept in the rod and forged together with tungsten. With content of 30~90ppm K, higher content, denser the K bubble, and better anti-deformation property. Following is an image showing the relationship between K content and K bubble clearly. 

There is a factor we need to point out that, during the production, the content of K is not as higher as better, as for K is also can be recommended as impurities, the forging process is influenced if the K is very high, such as higher than 120ppm, then the quality is influenced, for the bubble is existed in the rod and will be horizontal growing. Therefore, the ideal content of K doped is controlled in 30~90ppm for both wire and rod.

If you have any inquiry of tungsten electrode, please feel free to contact us:

Email: sales@chinatungsten.com/sales@xiamentungsten.com
Tel.: +86 592 5129696/+86 592 5129595
Fax: +86 592 5129797

Scan QR code of Chinatungsten Wechat platform to follow up the daily latest price and market of tungsten, molybdenum and rare earth.

Copper Bonded Tungsten Copper High Voltage Contact

With the development of high speed railway both in China and whole world wide, the application of high voltage related equipment has been increasing largely. High voltage contact is one of them. As for the contact of the electricity will result in high temperature and electricity conductivity, the choice of material have been very important. 

1.0  Hardness. Suitable hardness makes the larger contact, lower resistance, and also can lower down the contact temperature, decrease contact bonding, increase the wear resistance and longer the lifetime.

2.0  Electricity property. High electricity conductivity is a significant factor to connect the electricity system for the whole equipment operation. However, as for the contact momentary will direct into high temperature, therefore, the material requires high electricity conductivity and high temperature resistance, which assures the working and the contact will not be melted.

3.0  Thermal conductivity. The connection of electric contact will release high heat, which requires the material with high thermal conductivity, so that the heat can be conducted, but not gathered in the contact area and increase the high temperature of the point.

4.0  Chemical property. The contact should be with stable chemical properties, gas corrosion resistance and high volatility.

Considering the above factors, copper tungsten is chosen for it has owned all the above advantages, however, as for its thermal conductivity is still not enough for high voltage industry, it is welded on the copper part. Furthermore, in order to improve the electricity conductivity, the surface is always coated with a layer of silver.

 

This silver coated copper bonded tungsten copper contact is the best material for high voltage industry. The bonded part is applied both the moving and static contacts. Among them, the tungsten copper part can also be made with different contents, and 70W30Cu and 80W20Cu are used most widely. Surely, if your design is with customized drawings and materials, please do not hesitate to contact Chinatungsten by sales@chinatungsten.com.

If you have any inquiry of tungsten copper, please feel free to contact us:
Email: sales@chinatungsten.com/sales@xiamentungsten.com
Tel.: +86 592 5129696/+86 592 5129595
Fax: +86 592 5129797

Scan QR code of Chinatungsten Wechat platform to follow up the daily latest price and market of tungsten, molybdenum and rare earth.