The application of tungsten - Tungsten Carbide Alloy -Ⅰ

The mainly application of tungsten is in the Tungsten carbide alloy field. More than about 50% of the tungsten is used for the manufacture of tungsten carbide based cemented carbide. Tungsten carbide alloy has a number of excellent properties, mainly: a high hardness and wear resistance, particularly the high-temperature hardness, the hardness of Tungsten carbide alloy at 600℃ exceeds the high-speed steel at room temperature, the hardness of Tungsten carbide alloy at 1000℃ exceeds the carbon steel at room temperature; high elastic modulus, usually (40 to 70) × 104MPa. Thus Tungsten carbide alloy at room temperature has good rigidity, no significant plastic deformation; high compressive strength; small expansion coefficient, but its thermal conductivity and electrical conductivity similar to the iron and its alloys; chemical stability, acid-resistant alkali-resistant, at 600 ~ 800℃ has no significant oxidation; and good thermal stability. As a result of the above series of excellent performance, Tungsten carbide alloy occupy an important position in modern tools and materials, wear-resistant materials, high temperature and corrosion-resistant materials, in particular, showed great superiority in the machining industry. Compared with alloy steel tools, the main advantages of Tungsten carbide alloy are as follows’:

(1) Metal cutting speed can increase the number of times, greatly improving the productivity of labor;

(2) Manufactures size accuracy is improved; the surface roughness is reduced;

(3) The machinable of materials which are difficult to process with high-speed steel, such as heat-resistant alloys, titanium alloy, special hard cast iron and so on.

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