Hardfacing having coated ceramic particles or coated particles of other hard materials

摘要: Hardfacing to protect wear surfaces of drill bits (80) and other downhole tools having coated cubic boron nitride particles (44) or ceramic, superabrasive superhard materials dispersed within bonded a matrix deposit (20). The coating (42) on the ceramic hard may be formed from alloys such as tungsten carbide, carbide/cobalt cermets metal carbides nitrides. are preferably sintered have generally spherical shape. pre-mixed with selected that welding cooling will form both metallurgical bond mechanical bonds solidified deposit. A rod for hardfacing substrate prepared by placing mixture particles, carbide/cobalt, loose filler material into steel tube.