Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Metal and nonmetal in final product
Patent
1986-04-21
1988-01-19
Terapane, John F.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Metal and nonmetal in final product
419 8, 419 13, 419 27, B22F 706, B22F 326
Patent
active
047203714
ABSTRACT:
A method of manufacturing by a powder metallurgy process a rotary drill bit including a bit body having an external surface on which cutting elements are mounted, and a passage for supplying drilling fluid to the surface of the bit. The method comprises forming a hollow mould for moulding at least a portion of the bit body, packing at least part of the mould with powdered matrix material, and infiltrating the material with a metal alloy in a furnace to form a matrix. Before the mould is packed with the powdered material, formers are positioned on the interior surface of the mould to project into the interior of the mould space and form sockets to receive nozzles, or studs on which the cutting elements are mounted. According to the invention, the formers are formed from material, such as austenitic stainless steel, having a coefficient of thermal expansion not less than that of the matrix material. The formers may have a surface coating of a ceramic, such as boron nitride, or other material which does not wet or react with the binder alloy or matrix material.
REFERENCES:
patent: 2941288 (1960-06-01), Whitehouse
patent: 3818521 (1974-06-01), Vartanian et al.
patent: 3992202 (1976-11-01), Dulis et al.
patent: 4145798 (1979-03-01), Sarnes
patent: 4214906 (1980-07-01), Langer et al.
patent: 4378247 (1983-03-01), Tsoutsas
"MPR", Jun. 1984, pp. 329-334, (vol. 39, No. 6).
Tabeshfar et al., "Powder Metallurgy" 1984, vol. 27, No. 11, p. 19-24.
Jorgensen Eric
NL Petroleum Products Limited
Terapane John F.
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