Abstract
A method was devised to subject sintered diamond compact drill blanks to rapid thermal excursions, and the properties of the compact were studied after heating. It was found that thermal degradation as detected by rock-cutting tests and polished metallographic cross-sections could be correlated with acoustic emissions of the compact during heating. The drill blanks exhibited a delayed failure phenomenon which followed an Arrhenius relation with an activation energy of 327 kJ mol−1, and this behaviour was attributed to the initiation of graphitization of the sintered diamond compact.
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