Tungsten Carbide Button Cracking Tendency

When using one or more discrete bodies of polycrystalline diamond it was surprisingly found that the cracking and chipping tendency of tungsten carbide button considerably decreased. At the same time the wear resistance of the buttons was surprisingly high.

The explanation for these effects, the increase of the resistance against cracking and chipping and against wearing, might be a favourable stress pattern caused by the difference between the thermal expansion of the diamond body and the tungsten carbide body, giving the diamond a high and uniform compressive prestress.

A further improvement of the behavior of tungsten carbide buttons was revealed when using a tungsten carbide body having a multi-structure according to U.S. Pat. No. 4,743,515, it was surprisingly found that the cracking tendency of the tungsten carbide in the bottom of the bodies of polycrystalline diamond considerably decreased compared to the corresponding geometry and composition without the multi-structure carbide. Also the wear resistance of tungsten carbide buttons was improved at the same time.



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