Tungsten Powder Principle

Tungsten powder's raw material is tungsten oxide, in a muffle furnace four or more tube furnace hydrogen reduction, the particle size from 0.6-30 microns. They are divided to sub-coarse, fine few granularities and silver-gray powder, impurity content in accordance with national standards.

Tungsten Powder Production Methods

Tungsten powder is prepared by hydrogen reduction of tungsten trioxide or ammonium paratungstate. Hydrogen reduction process for the preparation of tungsten powder is generally divided into two phases: the first phase of 500 ~ 700oC temperature, tungsten trioxide reduction dioxide tungsten; the second phase in the temperature of 700 ~ 900oC, tungsten dioxide reduction into tungsten powder. Reduction reaction is often carried out in a tube furnace or a rotary furnace. Restore the performance of the tungsten powder (such as purity, particle size, particle size, composition) depends primarily on the reduction process. Restore the tungsten powder in a tube furnace, the reduction rate of the main parameters of the reduction temperature of the burning boat load of tungsten oxide, and burning the boat moving speed, moisture content in the hydrogen flow rate and hydrogen. As the reduction temperature increased, the grain size of tungsten powder thicker. Preparation of tungsten powder in addition to hydrogen reduction, there are early adopters of the tungsten oxide of carbon reduction, reduction temperature above 1050oC. Purity of tungsten powder is lower under this way. In addition, the tungsten metal aluminum, calcium, zinc oxide reduction process work in progress. For special applications requiring high purity, ultra-fine grained tungsten powder, the development of chloride, hydrogen reduction of tungsten, the tungsten powder particle size is less than 0.05μm.

Tungsten Powder Performance and Standards

Tungsten powder in addition to certain requirements of the impurity content, oxygen content is controlled within a certain range. Commonly used tungsten powder particle size is generally fee's average particle size of ~ 10μm. The shape of tungsten powder is polygonal particle. In addition, changes within a certain range of the tungsten powder surface area, bulk density, shaking density. The performance of the tungsten powder, tungsten materials production and the quality of the tungsten powder metallurgy products have a direct impact, in particular, the purity and particle size of the more obvious. The tungsten powder is classified according to the purity and particle size, as well as for different purposes. Huachang company is the first U.S. production of tungsten powder chemical purity hydrogen reduction of tungsten powder is divided into three; Japan has developed a tungsten powder and tungsten carbide powder, "the industry standard (JISH2116-1979); Britain, France and the former Soviet Union other countries are equipped with the uniform national standards of tungsten powder. Chinese industrial production of tungsten powder in 1982 develops the hydrogen reduction of tungsten powder conditions "(GB3458-82). This standard specifies the performance and classification of grades of tungsten powder. And test methods, inspection rules, packaging, transport and storage projects are clearly defined. For special purposes and military special tungsten powder production plant according to user requirements and pilot production.

Tungsten Powder Uses

The tungsten powder facts is the main raw material of processing Powder Metallurgy Tungsten and tungsten alloys. Pure tungsten powder can be made of wire, rods, tubes, plates and other processing materials and the products of a certain shape. Tungsten powder with other metal powders are mixed, can be made into a variety of tungsten alloys, such as tungsten and molybdenum alloys, tungsten, rhenium alloys, tungsten, copper alloy and high-density tungsten alloy and so on. Another important application of the tungsten powder is made ??of tungsten carbide powder, and then prepares carbide tools, such as turning, milling, drill and die.

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