In addition to in-situ synthesis technology, ex-situ synthesis technology is also a preparation method for tungsten trioxide/graphene composite materials. At present, there are many reports, which mainly include the two steps of pre-preparation of the dispersion of tungsten trioxide nanoparticles and the dispersion of graphene/graphene oxide and the mixing and reduction.

Tungsten trioxide is an n-type wide-band gap semiconductor oxide with low price, easy preparation, stable performance, non-toxic and harmless, and has been widely used in the field of photoelectrochemistry.

When I receive tungsten iridium stream mouth as my product, I think it as an alloy of tungsten and iridium. But after discussion with our manufacturing department, I found what I was thinking is really a mistake. 

The Chinese standard used now is YS/T 854-2012 Tungsten Iridium Stream Mouth, which is under the nonferrous metal industry standard and issued by the Ministry of Industry and Information Technology of the People’s Republic of China.

Among MoS2, WS2, MoSe2, and WSe2, the intrinsic state of WS2 is a bipolar semiconductor, which has both n-type and p-type electron transport properties. Therefore, graphene-like WS2 film has become the current research in the field of two-dimensional atomic layer materials. Hot spot. The following mainly introduces the research status of photoelectric and electrocatalytic properties of WS2 film.

Tungsten carbide powder is the main raw material for the production of cemented carbide, and ultra-fine tungsten carbide powder is also the main raw material for ultra-fine grained cemented carbide. 

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.

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 one of the key components of the cobalt-free battery, the negative electrode material can be modified with an appropriate amount of low-dimensional violet tungsten oxide powder during preparation, so that the prepared product has better charge and discharge characteristics and higher lithium storage capacity.

As a typical transition metal sulfide, tungsten disulfide flake nanomaterial have special optical, electrical, and catalytic properties, and are widely used in the fields of catalysis, hydrogen storage, and lithium storage.