Increasing demand for cemented carbide used in mine

In recent years,due to the mineral energy exploitation and the development of some large infrastructure construction, mining carbide,such as tungsten carbide ball, drill bit, coal cutting tooth, plane gear milling, drilling facilities, such as DTH drilling tools are widely used, market demand is increasing. With the high-speed development of technology of metallurgical industry in China, in terms of fuel gas, fuel oil, natural gas development such as drilling, some mechanical mining equipment and large and medium-sized aperture drilling tools with mining carbide demand is also increasing. Mining tools using the drilling pressure and its impact load produced by the rotation of broken rock, bit and ball tooth in the process of work in the high frequency of impact load at the same time through by torsion, bending, stretching, compression and other complex stress function, and in the high-speed rotary collision environment through rock, rock ore powder and the working medium such as water of wear and corrosion. Thus require mine cemented carbide with high hardness and toughness under the premise of should also have good wear-resisting corrosion resistance.

In order to achieve the unity of abrasion resistance and toughness, the related research at home and abroad scholars also developed many new type of cemented carbide, such as super fine and nano silicon carbide, "high temperature powder" cemented carbide, carbide functionally graded structure, low cobalt coarse grained cemented carbide, double bonding phase structure, and twin cemented carbide, etc. Here we focus on dual phase structure and twin cemented carbide. Pair of binding phase was made up by the company developed a new type of craft, it will fully dense large WC - Co spheres embedded in Co matrix to keep similar to ordinary alloy wear resistance matrix, and the binding phase can be a bonding metal or alloy, also can be a different kind of cemented carbide. Its most outstanding characteristic is hard phase is not a hard compound (WC), but by the refractory compounds and metal Co after sintering and become into crystalline hard material pellet (WC - Co), and mixed with metal binder are secondary sintering. Compared with most of the two phase carbide, double carbide have greater binding phase design degrees of freedom (size, concrete strength, toughness and hardness, etc.), the cone bit, impact drill, drag bit has widely used tools such as. Carbide and twinning structure, also known as the non-uniform grain cemented carbide, because the WC grain size distribution curve of the alloy has two peaks, thus also known as bimodal structure cemented carbide. This kind of structure, coarse grain WC structure can provide good plasticity and toughness, and a certain proportion of fine grain WC can provide high resistance to wear.