Method of forming a diamond tooth insert for a drill bit and a d

Details Method of forming a diamond tooth insert for a drill bit and a d Method of forming a diamond tooth insert for a drill bit and a d

1984-06-22

1986-08-26

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Making composite or hollow article

419 11, 419 48, 76DIG12, 76101R, 125 39, 175329, 299 89, 408199, 428408, B22F 700

Patent

active

046082263

ABSTRACT:
An improved bond between diamond and a metallic matrix can be achieved by hot pressing the metallic matrix onto a cleaned polycrystalline diamond (PCD) element. The PCD is degreased and then maintained substantially free from subsequent oxidation. The cleaned nonoxidized PCD is then disposed within a hot press and bonded under pressure and temperature with a conventional metallic matrix to form a cutting element. The cutting element thus formed is comprised of a PCD portion and a metallic portion with a high strength bond formed therebetween, on at least one surface of the diamond and, preferably, two adjacent surfaces. Typically, the metallic matrix is a carbide-forming metal or mixture of carbide-forming metals, and the diamond is a thermally stable porous, sintered polycrystalline product. The insert is subsequently placed within a bit mold and a bit is fabricated according to conventional powder metallurgical infiltration techniques. The diamond-to-metal bond in the insert remains stable during the furnacing of the infiltration bit, and a high-strength bond is formed between the metallic portion of the insert and the matrix body bit.

REFERENCES:
patent: 4205425 (1980-06-01), Shinozaki
patent: 4234661 (1980-11-01), Lee et al.
patent: 4241135 (1980-12-01), Lee et al.
patent: 4554130 (1985-11-01), Ecer

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