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Tungsten Widely Used
Jul 14, 2017

Tungsten and its alloys are widely used in electronics, Tungsten electric light industry. For the manufacture of a variety of lighting bulbs, tube filament is used with anti-sagging properties of doped tungsten wire.

Doped tungsten wire is added rhenium. Tungsten The thermocouple made of tungsten rhenium alloy wire with low rhenium content and tungsten rhenium alloy wire with high rhenium content has a wide temperature range (0 ~ 2500 ℃), the linear relationship between temperature and thermoelectromotive force is good. Temperature reaction speed (3 seconds), the price is relatively cheap, is measured in the hydrogen atmosphere of the ideal thermocouple.

Tungsten wire not only triggered a revolution in the lighting industry, but also because of its high melting point, without losing its mechanical integrity under the premise of becoming a kind of electronic thermionic emitters, such as scanning electrons (sub- Mirror and transmission electron (sub-microscopic) mirror of the electron source. Also used as a filament for an X-ray tube. In an X-ray tube, Tungsten the electrons produced by the tungsten wire are accelerated to strike the tungsten and tungsten rhenium alloy anodes and emit X-rays from the anode. Tungsten The energy of the electron beam produced by the tungsten filament is very high for the generation of X-rays, so that the spots on the surface of the electron beam collide are very hot, so that the rotary anode is used in most X-ray tubes.

The tungsten has a density of 19.25 g / cm3, about 2.5 times that of iron (7.87 g / cm3), and is one of the heaviest metal elements in the cycle. A high-density tungsten alloy (i.e., high specific gravity tungsten alloy) made from this characteristic of tungsten has become an important application area for tungsten. The use of liquid sintering process, in the tungsten powder at the same time by adding nickel, iron, Tungsten copper and a small amount of other elements, can be made of high-density tungsten alloy. According to the different components, high-density tungsten alloy can be divided into tungsten-nickel-iron and tungsten-nickel-copper alloy. Through the liquid phase sintering, Tungsten the density of up to 17 ~ 18.6 g / cm 3. The so-called liquid phase sintering is the mixed powder compact at the sintering temperature of a certain amount of liquid phase sintering process. The advantage is that the liquid phase moisturizes the solid particles and dissolves a small amount of solid matter, greatly accelerating the process of densification and grain growth, and to achieve a very high relative density. For example, Tungsten nickel iron powder is melted when the sintering is carried out in the case of nickel iron powder which is usually used in the liquid phase sintering. Although the solubility of liquid ferronium in the solid tungsten (95% of the body fraction) is minimal, the solid tungsten is easily dissolved in liquid nickel iron. Once the liquid nickel iron moistens the tungsten particles and dissolves a portion of the tungsten powder, the tungsten particles change shape and their internal pores disappear immediately when the stream enters. The process continues, the tungsten particles are coarsening and growing, Tungsten resulting in a final product that is nearly 100% dense and has the best microstructure.

Tungsten is the main alloying element of high speed tool steel, alloy structural steel, spring steel, heat resistant steel and stainless steel, and the amount of tungsten used in the production of special steel is very large.

Tungsten can be alloyed by solid solution strengthening, Tungsten precipitation strengthening and dispersion strengthening, etc., to improve the high temperature strength and plasticity of tungsten material. Through the alloying, tungsten has formed a variety of contemporary human civilization has a significant impact on the non-ferrous metal alloy.

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