Wear resistant composite insert, boring tool using such insert,

Details Wear resistant composite insert, boring tool using such insert, Wear resistant composite insert, boring tool using such insert,

1979-01-08

1981-06-23

Parrish, John

Abrasive tool making process, material, or composition

With inorganic material

51309, C04B 3552

Patent

active

042748402

ABSTRACT:
A wear insert for earth boring tools, such as drill bits, has diamonds imbedded in a sintered matrix of tungsten-carbide and Invar. The matrix prior to sintering has a particle size of from about 0.5 to about 10 microns. Invar represents from about 3% to about 20% by weight of the matrix. The diamonds are arrayed in a desired pattern in a matrix preform; compression of the resultant preform at pressures of from about 10 to about 20 tons per square inch consolidates preform. The consolidated preform is sintered at a temperature just below the melting point of Invar in a neutral atmosphere of nitrogen and hydrogen formed of dissociated ammonia. Nitrogen results in the wetting of the diamonds. Hydrogen presents a reducing atmosphere.

REFERENCES:
patent: 3372010 (1968-03-01), Parsons
patent: 3594141 (1971-07-01), Houston et al.
patent: 3850053 (1974-11-01), Bovenkerk
patent: 4171973 (1979-10-01), Hara et al.

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