Tungsten carbide powder, an important raw material for super wear-resistant coatings

       There are many kinds of raw materials for thermal spray coating. Among them, WC is the main raw material for manufacturing cemented carbide, and it is also an important raw material powder for preparing high wear-resistant coatings in the field of thermal spraying.

The tungsten-carbon binary system can form two crystalline carbides, namely WC and W2C. When the interstitial positions of the closely packed lattice lattice of metal tungsten are all filled with carbon atoms with a small atomic radius, WC crystals are formed; when only half of the interstitial positions in the tungsten lattice are occupied by carbon atoms, then Form W2C compound. WC has high hardness, especially its hot hardness. It can be well wetted by Co, Ni, Fe and other metal melts, especially cobalt melt has good wettability to WC. When the temperature is raised above the melting point of the metal, WC can be dissolved in these metal melts; and when the temperature is lowered, WC can be precipitated. These excellent properties make it possible to use metals such as cobalt or nickel as the binder phase material, which can be sintered or coated at high temperature to form cemented carbide powder, which is used to manufacture thermal strength, red hardness and wear resistance. Carbide products or wear-resistant coatings

The melting point and hardness of W2C are higher than that of WC. It can form a W2C+WC eutectic mixture with WC. The melting point is lowered and it is easy to cast. It is the so-called "cast tungsten carbide" or "fusible tungsten carbide". 3.8%~4.0% (mass), of which W2C is 78%-80% (mass), and WC is 20%~22% (mass). This cast tungsten carbide is a low-cost and wear-resistant material.



Coated, sintered, agglomerated and melt-dispersed tungsten carbide atomized powders can be used as thermal spray materials, and WC powder can also be used with cobalt-based, nickel-based and iron-based self-fluxing alloy powders, nickel-aluminum self-adhesive powders It is widely used in the preparation of high wear-resistant coatings, especially in the fields of wear-resistant particle wear, hard surface wear and mud-sand erosion wear.