What Is Highly Pure Tungsten Bar?

Highly pure tungsten is a kind of wolfram bar which only contains a high concentration of tungsten, and the content of tungsten cannot less than 99.98%. Due to high tungsten content, its price will be a corresponding increase. Tungsten bar is a material with silver-gray metallic luster, generally it can be divided into round bar and square bar, the difference of them is that different sizes and shapes. According to the State on November 1, 2006 implementation of the GB / T 3459-2006 "tungsten" requirement, code of pure wolfram bar is TW-2, which is mainly applied to make bar fight contact, code of tungsten steel is usually TW-1 or TW-4, it is mainly used in steel-making. It also used for the preparation of high quality tungsten, or other fields in high purity tungsten products. There are some differences of manufacturing process between the general tungsten and highly pure wolfram bars. The followings are the main steps to make the highly pure tungsten bar.

The first step is to manufacture tungsten powder. At the beginning of this process, pay attention to ensure that the high-purity of wolfram powder and its granularity. At present, many major manufacturers use the full atmosphere hydrogen reduction furnace to deacidize tungsten oxide and produce high-purity wolfram powder. The second step is press wolfram bar. The point of this technology is to ensure that the size of wolfram bar has the high accuracy. Generally speaking, it is better to make a good mold of the final product in advance, and then press it with a precision pressing.

The third step is the pre-burn stage, heating the compact at a temperature that below the final sintering heating temperature. Then put the pressed tungsten blanks into the sintering furnace to sintering, which could make the internal microstructure of tungsten bar keep a uniform state. The purpose of sintering is to obtain products with the theoretical density and pore-free at the high temperature. The final step is to vertical sinter wolfram bar into the final product. That is to put the semi-finished tungsten bars into vertical sintered machine and sinter it into finished products.

Highly pure tungsten bar and all the related products are all the same industrial products, produced by the plant. Whether it is 99.95%, or 99.96%, 99.97%, 99.98% or even 99.99% of tungsten, it is made by powder metallurgy production.

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