Tungsten Carbide Mining Tool Developments

Except playing an important role in cutting field, tungsten carbide has been widely used in mining and drilling industry. The major product of tungsten carbide mining tool is tungsten carbide button, which can be assembled on the tool and use the impact load produced by own bit pressure and rotation to crush the rocks. In the process of rock drilling, the bit not only should endure the high-frequency impact, but also need to endure twisting, bending, stretching and compression and other complex and the role of stress in the high-speed rotary collision environment subject to wear and corrosion of rock, mineral water and other working medium. So tungsten carbide mining tools have higher requirements in wear resistance and toughness.

At present, the major trends of tungsten carbide mining tools include double-crystal structure, double binder phase structure honeycomb structure and low-Co coarse grain tungsten carbide. Double-crystal structure carbide is also called non-uniform grain carbide. And due to there are two peak value on the WC grain distribution curve, so it also called double peak structure carbide. Wherein the coarse grain WC structure provides good ductility and toughness, a certain proportion of fine grained WC provides high wear resistance; double binder phase structure carbide has a greater degree of freedom (including the size, the hardness, the toughness, the volume ratio of the hard phase and the strength and toughness of the base) in micro structure design than common tungsten carbide. It can match the performance required by individually controlling micro-structure and properties; honeycomb structure carbide through component structure and property design to form low-Co fine grain distribution and high-Co coarse grain distribution and show the honeycomb structure; Structural design principle of low cobalt carbide coarse grain is: WC coarse grains, smaller than the surface area of the alloy in the Co layer thickness, thereby increasing the impact toughness of the alloy; alloys increase and decrease the content of Co content in WC so that the wear resistance of the alloy.

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