the quick-making method of tungsten carbide (WC powder)

Tungsten carbide (WC) hard alloy is widely used in coal, mining, oil exploration and metal cutting, and other fields, with high hardness, smaller thermal expansion coefficient and good wear resistance and corrosion resistance. Different USES of tungsten carbide with different particle size of WC.

Ultrafine tungsten carbide cutting tool used when finishing, and the measures or fine grain WC. Gravity and heavy cutting, using coarse particle in WC; In the aspect of mining tools, rock hardness, impact load is big, need to use the coarse grain WC; In the aspect of impact resistance tool, using the raw material, coarse particle in WC.

Coarse WC grain of deflection and bifurcation of the crack has obvious effect, can effectively improve the toughness of tungsten carbide, as a result, the world within the scope of the mine adopts coarse grain WC tungsten carbide tools.

Preparation is mainly the traditional way of WC tungsten carbide powder metallurgy technology, process complex, time is long, high energy consumption. In recent years, some research has focused on the use of high energy beam of rapid manufacturing technology to the preparation of WC reinforced composites. , but can only solve the problem of material surface enhancement, in block WC material preparation progress is not rapid.

Recently,shandong university of science and technology of China,to use C with W powder as raw materials, use of consumable electrode of dc arc in situ composite was prepared by metallurgical technology coarse grain WC block, made breakthrough progress.

On microstructure of samples obtained detection show that the overall sample density, no obvious holes and cracks. The results show that large current dc arc melting high melting point metal quickly, can realize the WC grew up in the in crystallization in the process of fused, short process so as to achieve the purpose of rapid preparation of bulk materials.