Boring or penetrating the earth – Bit or bit element – Magnetized or with magnet
Patent
1982-05-28
1985-07-30
Pate, III, William F.
Boring or penetrating the earth
Bit or bit element
Magnetized or with magnet
51309, 175410, E21B 1046
Patent
active
045315957
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 (1962-03-01), Parsons
patent: 3389761 (1968-06-01), Ott
patent: 3594141 (1971-07-01), Houston et al.
patent: 3850053 (1974-11-01), Bovenkark
patent: 4140189 (1979-02-01), Garner
patent: 4171973 (1979-10-01), Hara et al.
patent: 4411672 (1983-10-01), Ishizuka
patent: 4440573 (1984-04-01), Ishizuka
"Properties of Experimental WC-Base Composition", Chapter XI, pp. 188-191.
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