Uniform coarse tungsten carbide powder and cemented tungsten car

Details Uniform coarse tungsten carbide powder and cemented tungsten car Uniform coarse tungsten carbide powder and cemented tungsten car

1989-02-10

1991-01-08

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Metal and nonmetal in final product

419 33, 419 23, 419 37, 419 54, 419 55, 419 18, 423440, B22F 300

Patent

active

049833545

ABSTRACT:
A tungsten carbide powder and cemented tungsten carbide article made from the powder are disclosed. The powder has a particle size of greater than 20 micrometers in diameter and no particles less than one-half the average particle size or greater than two and one-half times the average particle size. A process is disclosed for producing the powder which comprises deagglomerating and classifying the tungsten powder to produce a powder wherein the Fisher Subseive Size is greater than 20 micrometers in diameter and wherein essentially no particles are greater than two and one-half times larger than the average Fisher Subsieve Size, forming a first mixture of the tungsten powder and carbon, carburizing, and deagglomerating and classifying the resulting tungsten carbide powder to eliminate particles greater than two and one-half times the average Fisher Subseive Size value and produce a tungsten carbide powder wherein the particle size is greater than 20 micrometers in diameter and wherein there are no particles less than one-half of the average particle size and no particles greater than two and one-half times the average particle size of the tungsten carbide powder. To produce the article a uniform second mixture is formed of the daeagglomerated and classified tungsten carbide powder and cobalt powder wherein the cobalt content is about 3% to 20% by weight, a third mixture is formed of the second mixture and a wax binder, a green article is formed from the third mixture, and sintered at about 1380.degree. C. to 1550.degree. C.

REFERENCES:
patent: 4579587 (1986-04-01), Grant et al.
patent: 4784335 (1988-11-01), Huether

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