Tungsten Carbide – Polycrystalline Diamond Buttons Impact Resistance (2/2)

Another purpose of this experiment is to show that the experimental data on the number of polycrystalline diamond composite button impact on the resistance of polycrystalline diamond buttons, tungsten carbide substrate by more marked hole inserts welded certain number of polycrystalline diamond can effectively improve the wear resistance of tungsten carbide buttons. The schematic diagram of 1-4 PCD inserts welded tungsten carbide - polycrystalline diamond composite buttons as follow:

From the figure we can be more clearly seen in the PCD carbide ball symmetrically distributed around the button tip, the tip of the general impact of the maximum stress endured so cemented carbide substrate is usually not tip inserts welded polycrystalline diamond PCD damaged by great impact energy. Experimental results show that a polycrystalline diamond insert welded carbide - polycrystalline diamond composite ball gear not rupture under impact action 30J-70J, that within the impact resistance of safety values. For φ16mm diameter high pressure DTH drill site operations in the approximate range withstand the impact energy also falls within this range, it is considered that a polycrystalline diamond insert welded carbide - polycrystalline diamond compact button able to meet the requirements of DTH drill. However, when the hole of tungsten carbide basis is more than 3, its impacting resistance will remarkably decrease (starting to destroy when the impact energy is higher than 50J). Therefore, for tungsten carbide – polycrystalline diamond button, the more polycrystalline diamond does not mean the better properties, which has a optimum range and the effect subjects to normal distribution.

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