The friction and wear property of tungsten disulfide nano powder is a new topic, as a new type of solid lubricating material, tungsten disulfide has excellent lubricating property, it has a layered hexagonal structure, the W and S elements in the layer are combined by covalent bond, and the molecular bond formed by S-S in the layer is combined. Because of the low bond energy of the latter, it is easy to slip during the friction process, so it has lower friction coefficient.

Currently tungsten oxide has been widely used in electrochromic intelligent glass, optical device, supercapacitor, gas sensor, photocatalysis, photothermal therapy and other application fields. With the rapid development of nano science and technology, more and more synthesis methods of nano tungsten oxide are available, mainly has there kinds of methods including vapor deposition, liquid-phase synthesis and solid-phase synthesis.

Tungsten oxide is the potential oxide material in the energy field for its rich content in the earth, highly adjustable composition, high chemical stability at low pH value and excellent conductivity. Now it has wide application in seven fields including electrochromic and photochromic, lithium-ion battery anode materials and heat insulation materials, etc.

With the rapid development of industry, the overuse of oil, natural gas and other resources has caused serious pollution of air and environment. The manufacture of gas sensing material for detecting toxic and harmful gases has became a hot research spot. Nano tungsten trioxide used as gas sensing material can be divided into four structures。

The following is to introduce how nano tungsten trioxide is photocatalyzed. Firstly, preparing for a nano tungsten trioxide, then text it photocatalytic properities of water cracking into oxygen and protons. Because the nano tungsten trioxide lack of quality of metals,  it almost no catalysis. Secondly, adding a small amount of platinum and ruthenium dioxide into nano tungsten trioxide to improve its catalytic performance.

The hydrogen reduction technique of purple tungsten oxide(WO2.72), the formation mechanism of tungsten powder particles and its hydrogen reduction process conditions are analyzed, it is found that WO2.72 is the most suitable raw material for the preparation of nano tungsten powder.

Ultrafine tungsten powder is the important raw material for producing fine grain cemented carbide, the raw materials for producing superfine tungsten powder consist purple tungsten oxide(purple tungsten) and blue tungsten oxide(blue tungsten). Blue tungsten oxide is most widely used raw material to produce tungsten powder by hydrogen reduction method. As long as the conditions are low temperature, dry hydrogen, high hydrogen flow and thin material layer, ultrafine tungsten powder is able to be produced by hydrogen reduction method. However, too high hydrogen flow and thin material layer will increase the cost. Purple tungsten oxide is a type of tungsten oxide product developed in recent years. It has unique properties and many advantages in the production of ultra-fine tungsten powder. Many metallurgical experts do wide range of research on it. Producing fine and uniform superfine tungsten powder is the key to producing superfine grain cemented carbide. 

The following is the technical specifications of tungsten contact for breaker, including range, standard, technical specification, testing method, transportation, packing, etc.

The testing method of sag of tungsten wire is processed according to Chinese standard of GB 4105-83, which is suitable for the diameter of Ø0.35~1mm.

Urine is one of the most gravimetric nitrogen (N) carriers in human excrement and contributes 80% of the nitrogen and 10% of the COD load in urban sewage in spite of accounting for only one percent of domestic wastewater.