05755299 is referenced by 82 patents and cites 132 patents.

Hardfacing to protect wear surfaces of drill bits and other downhole tools having coated diamond particles dispersed within and bonded to a metallic matrix deposit. The coating on the diamond particles may be formed from materials and alloys such as particles, tungsten carbide, and tungsten carbide/cobalt and cermets such as metal carbides and metal nitrides. The coated diamond particles are preferably sintered and have a generally spherical shape. The coated diamond particles are premixed with selected materials such that welding and cooling will form both a metallurgical bond and a mechanical bond within the solidified metallic matrix deposit. A welding rod is prepared by placing a mixture of coated diamond particles, hard particles such as tungsten carbide/cobalt, and loose filler material into a steel tube. A substrate is hardfaced by progressively melting the welding rod onto a selected surface of the substrate and allowing the melted material to solidify, forming the desired hardfacing with coated diamond particles dispersed therein on the substrate surface.

Title
Hardfacing with coated diamond particles
Application Number
8/579454
Publication Number
5755299
Application Date
December 27, 1995
Publication Date
May 26, 1998
Inventor
Robert Delwiche
Brussels
BE
James W Langford Jr
Red Oak
TX, US
Agent
Baker & Botts L
Assignee
Dresser
TX, US
IPC
B34D 3/02
E21B 10/46
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