公开(公告)号：GB2408474A

公开(公告)日：2005-06-01

申请号：GB0425973

申请日：2004-11-25

Applicant: SMITH INTERNATIONAL

Inventor： LOCKWOOD GARY ,  RAMAMURTHY VISWANADHAM ,  GRIFFO ANTHONY

IPC: B23K9/04 ,  B23K10/02 ,  B23K26/34 ,  B23K35/02 ,  B23K35/32 ,  C23C30/00 ,  E21B10/50 ,  B23K5/18

Abstract: A hardfacing material comprises carbide particles that have a barrier coating of cobalt, nickel, iron or an alloy thereof, and a binder alloy. The carbide particles may be sintered tungsten carbide with a size of 16-40 mesh (420-1190 microns) or a size of 100-325 mesh. The barrier coating has a thickness of 5-76 microns. The material is used to hardface steel drill bit components such as cutting elements on roller cone drill bits.

公开(公告)号：GB2408474B

公开(公告)日：2006-03-15

申请号：GB0425973

申请日：2004-11-25

Applicant: SMITH INTERNATIONAL

Inventor： LOCKWOOD GARY ,  VISWANADHAM RAMAMURTHY ,  GRIFFO ANTHONY

IPC: B23K9/04 ,  B23K10/02 ,  B23K26/34 ,  B23K35/02 ,  B23K35/32 ,  C23C30/00 ,  E21B10/50

Abstract: A hardfacing composition for a drill bit includes a carbide phase made from carbide particles having a barrier coating disposed thereon, and binder alloy. Also, a drill bit includes a steel bit body having hardfacing thereon and having at least one blade thereon, at least one cutter pocket disposed on the blade, at least one cutter disposed in the cutter pocket; and hardfacing applied to at least a select portion of the drill bit, the hardfacing being formed with a hardfacing composition that includes a carbide phase formed from carbide particles having a barrier coating disposed thereon; and a binder alloy.