IMPROVED EARTH-BORING BITS

摘要

Improved formulations of tungsten carbide have been disclosed. The improved tungsten carbide formulations typically include large tungsten carbide (WC) grains in a lower cobalt content binder matrix. The improved formulations ar e suitable for gage inserts and inner row insert in rock bits and earthen cutters. Dril l bits incorporating these tungsten carbide inserts have better performance and longer lifetime because the improved tungsten carbide formulations result in reduced thermal fatigue and still maintain required toughness and wear resistance.