Patent ID: 7712553
Filing Date: 2010-05-11
Classification: B21C,B22F,C22C,E21B,Y10T

Abstract:
1. In a method for manufacturing a PDC cutter, comprising the steps of: coating the exterior surface of a PDC cutter having a body of diamond crystals and a catalyzing material contained within said body, said coating comprising a material impervious to a given acid or mixture of acids; selectively removing a segment of said coating from said PDC cutter; applying said given acid or mixture of given acids to said PDC cutter to leach out at least some of the catalyzing material contained within said body of diamond crystals, thereby providing improved thermal stability to a first region of the PDC cutter from which said coating has been removed while retaining improved impact strength within a second region of the PDC cutter upon which said coating has been retained.