Molded, boron carbide-containing, sintered articles and manufact

Details Molded, boron carbide-containing, sintered articles and manufact Molded, boron carbide-containing, sintered articles and manufact

1986-05-21

1987-04-28

Lechert, Jr., Stephen J.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75236, 75244, 419 17, 419 23, 419 26, 419 28, 419 25, C22C 2906

Patent

active

046611550

ABSTRACT:
A molded, boron carbide-containing, sintered article which includes at least 65 percent by volume boron carbide; and from 5 to 35 percent by volume of at least one binder metal selected from the group consisting of molybdenum, molybdenum alloys, tungsten and tungsten alloys, having a melting point above 1,800.degree. C., and forming no molten borides or carbides within a temperature range of from 1,800.degree. to 1,950.degree. C. A method for producing the article includes the steps of mixing to obtain a homogeneous mixture from 20 to 80 percent by weight boron carbide particles having a particle size ranging from 1 to 1,650 microns with up to 80 percent by weight of particles of the at least one binder metal having a particle size ranging from 35 to 100 microns; introducing the homogeneous mixture into a graphite matrix mold; heating to sinter the homogeneous mixture at a temperature ranging from 1,800.degree. to 2,000.degree. C. for a predetermined heating time in a protective gas atmosphere to provide a sintered article; compressing the sintered article while hot in a protective gas atmosphere at a pressure ranging from 100 to 300 N/mm.sup.2 for a pressing time ranging from 5 to 20 minutes to provide the molded, sintered article; and cooling the molded, sintered article to ambient temperature at a cooling rate ranging from 100.degree. to 200.degree. C./min for a predetermined cooling time; provided that the sum of the heating time and the cooling time does not exceed the pressing time.

REFERENCES:
patent: 3178807 (1965-04-01), Bergmann
patent: 3447921 (1969-06-01), Chang
patent: 4217141 (1980-08-01), Schrittwieser
patent: 4320204 (1982-03-01), Weaver
patent: 4557893 (1985-12-01), Jatkar et al.
Kieffer, R. K. and Schwarzkopf, P., Hartstoffe und Hartmetalle Springer-Verlag, 1953.

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