Tungsten carbide

Tungsten Carbide is a compound of tungsten and carbon. Black hexagonal, with a metallic luster, hardness close to diamond, electricity, good heat conductor. Tungsten is insoluble in water, hydrochloric acid and sulfuric acid, nitric acid soluble - a mixed acid of hydrofluoric acid. Pure tungsten carbide is fragile, if the incorporation of a small amount of titanium, cobalt and other metals, can be reduced brittleness. Tungsten steel cutting tools used, often by adding titanium carbide, tantalum or mixtures thereof, in order to improve the anti-knock capacity. Stable chemical properties of tungsten carbide, cemented carbide is widely used in the production of the material.

Processing characteristics of tungsten

In metals, tungsten metal has the highest melting point, high temperature strength, creep resistance and thermal conductivity, good electrical conductivity and electron emission properties of Tungsten melting point,heavy, hard and brittle, difficult process, but as long as there is a reasonable process, tungsten can be made by powder metallurgy billet, extrusion, forging, rolling, spinning and drawing, and other processing timber. As the plastic processing tungsten improvement in the level of their organization, tensile strength and ductility - brittle transition temperature is greatly improved.

The features of high density tungsten alloy

Tungsten heavy alloy for counter balance with a series of excellent characteristics, than the major: general proportion of high 16.5-18.75g / cm3 ,, strength: tensile strength of 700-1000Mpa, absorb radiation and strong: its capacity 30-40% higher than lead thermal conductivity coefficient: 5-fold die steel; thermal expansion coefficient: Only iron or 1 / 2-1 / 3, good conductive properties of steel; Tungsten alloys has good weldability and formability. Given the high proportion alloy has the above excellent features, it is widely used in the aerospace, aviation, military, oil drilling, electrical instrumentation, medical and other industries.

Tungsten heavy alloy properties

Tungsten alloy Counterweight is a class of 80-98% distributed in the matrix Ni-Fe-W solid solution of two-phase composite. A combination of Tungsten high-density, high strength and good ductility matrix phase, therefore, it has a good plasticity, good-ray absorption capacity, good corrosion resistance and high temperature oxidation resistance, good machining properties, good electrical conductivity, thermal conductivity and low thermal expansion coefficient, good weldability and surface electroplating, and a series of excellent physical, chemical and mechanical properties.

Tungsten heavy alloy

Tungsten heavy alloy (referred WHA) products are usually made WNiFe or WNiCu or WNiCuFe manufactured by powder metallurgy production process. Depending on the product use and working environment requirements, High density Tungsten alloy products are usually distributed tungsten content of 79% W ~ 97% W, a density in the range of 15.00g / cm ~ 18.50g / cm. While adding some rare elements (Co, Mo, Cr, etc.) in order to improve the performance of the product portion, such as: hardness, ultimate tensile strength, yield strength, elongation and the like.

Defined of tungsten alloy

Tungsten alloy is tungsten-based alloys by adding other elements. In metals, the highest, high temperature strength and creep resistance and thermal conductivity, electrical conductivity and electron emission properties of tungsten melting point are good, than the major, in addition to a large number of alloys used in the manufacture of carbide and as additives, tungsten and Tungsten alloys are widely used electronic, electric light industry, but also aerospace, casting, weaponry and other sectors for the production of rocket nozzles, casting molds,penetrator, contacts, heating element and a heat shield and so on.

What should be noted tungsten material

Tungsten alloy metals in the interstitial impurities, microstructure and alloying elements, as well as plastic processing and surface condition of the tungsten material plastic - brittle transition temperature has a significant impact. In addition to rhenium tungsten material can significantly reduce plastic - brittle transition temperature, the other alloying elements on the lower ductility - brittle transition temperatures with little success. Poor oxidation resistance of tungsten oxide and molybdenum similar characteristics, will take place at more than 1000 ℃ tungsten trioxide volatile, have a "disastrous" oxidation. Must be protected in a vacuum or under an inert atmosphere, if used in high temperature oxidizing atmosphere, you must add a protective coating high temperature Tungsten alloys material.