Abstract
Polycrystalline diamond compacts of relatively coarse grain size were evaluated for their wear properties by cutting a cylindrical core of sandstone on a lathe in a manner designed to produce a helical groove. It was observed that the diamond-diamond grain boundaries are sufficiently strong to sustain the severe stress and abrasion conditions so that each grain acts like a single-crystal diamond cutter and there is no massive particle pull-out. The wear mode is similar to that of a single-crystal diamond, except that gross cleavage is reduced by deformation bands generated during the sintering process.
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