Tungsten Carbide Buttons Wear Resistance Analysis (2/2)

We can learn from the picture of part I that the abrasive ratio of tungsten carbide buttons grinding granite is about a thousand, and the lower the wear ratio and DTH drill button site work more consistent. Because in the DTH drilling process, most of tungsten carbide buttons failure caused by abrasion, only a small part is due to the impact of button fracture failure, particularly those with the gage side effects of buttons due to the maximum linear velocity so that the wear is also the most serious. In some high pressure DTH drill operations on its production process more stringent requirements, if the button wear failure require frequent replacement, so will greatly increase the cost of human and material resources. Therefore, the related researchers do some research on the impact of trace elements on the wear resistance of tungsten carbide buttons.

Generally, in order to refine tungsten carbide button (WC) grains, we can add grain growth inhibitors; improve the corrosion resistance of tungsten carbide button by adding corrosion-resistant components; for changing the properties of the alloy can be achieved by adding a refractory metal or rare earth elements and other methods. After a number of experiments and statistical data show that the most effective for WC-20Co carbide grain growth inhibitor and vanadium, niobium, tantalum, titanium, zirconium and other elements, addition of these elements contribute to grain refinement and increase wear resistance. Complex compounds of rare earth elements can occur with spherical added oxygen (O), calcium (Ca), sulfur (S) and other impurities, which change the distribution of impurities in the original interface. In addition, the wettability, the connecting strength of the interface and the wear resistance of cobalt (Co) on tungsten carbide (WC) has been remarkably improved.

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