Tungsten Carbide Buttons Wear Resistance Influencing Factors (2/2)

Trace element and other additives are also the common method for improving wear resistance of tungsten carbide buttons. People add some elements with specific additives and excellent performance to change the composition and properties of carbide itself to adapt to different requirements of works More common additives such as grain growth inhibitor (refined grains, inhibit grain growth), corrosion of some components (to improve corrosion resistance), some of the rare earth element or refractory metals (carbide corresponding optimization performance). The principles of influencing factors of additives on wear resistance of tungsten carbide buttons are different, some uniforms the structure by grain refined, some improves the binding strength of interface by improving the wettability of cobalt (Co) on tungsten carbide (WC).

Finally, we introduce the effects of chemical treatment on wear resistance of tungsten carbide button. Theoretically, heat treatment of tooth carbide ball can change the organizational structure of the matrix corresponding compound distribution and coordination, so as to give full play to the composite materials’ advantage. Therefore, the relevant domestic and foreign scholars and researchers have carried out extensive research on the mechanism of heat treatment on tungsten carbide button, and draw different conclusions.

At present, there are two explanations of tungsten carbide buttons heat treatment mechanism: one is thought tungsten (W) supplementary heat treatment was dissolved in Co binder phase, the contiguity of WC grain size decreased, while the WC and Co contiguity rise, thus wear resistance of tungsten carbide buttons is improved; another is thought heat treatment changes the stress state phase structure and internal Cu alloy phase, which can keep the face-centered cubic structure (fcc) a-Co binder phase at high temperatures to a large extent, reduce HCP (hexagonal closepacked structure) e-Co. The former is a plastic material, and the latter is a brittle material, thus tungsten carbide button abrasion resistance corresponding increases. In addition, there are carburizing, boron, lanthanum and other chemical heat treatment and laser treatment, ion injection, etc.

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