Method of making a tungsten carbide body

Details Method of making a tungsten carbide body Method of making a tungsten carbide body

1977-03-08

1978-11-07

White, Robert F.

Plastic and nonmetallic article shaping or treating: processes

With step of cooling to a temperature of zero degrees c. or...

106 43, 264 296, 264 297, 264 63, 264 65, 264 66, 264 67, 423440, C04B 3556

Patent

active

041246659

ABSTRACT:
The method of preparing very dense tungsten carbide bodies. A substantially stoichiometric mixture is prepared from tungsten particles and a carbon precursor, the precursor being a vinylidene chloride based polymeric material such as SARAN. A green body is pressed from the mixture, and said body is initially heated at a controlled rate to decompose on the order of 20% of the polymeric material, providing HCl gas which reacts with oxide contaminants on the metal particles to provide a clean, reactive metal surface for later reaction with the carbon. An intermediate baking step is provided to controllably evolve the gaseous products that result from continued decomposition of the polymeric material. After subsequent heating to 800.degree.-1300.degree. C, the body may be cooled to room temperature and machined to provide threads, apertures or the like. When the body is subsequently heated to about 2000.degree. C, it shrinks to provide a very hard, dense body with a typical density between 14 and 15 g/cc.

REFERENCES:
patent: 2543235 (1951-02-01), Dreyer et al.
patent: 2593943 (1952-04-01), Wainer
patent: 3933984 (1976-01-01), Kimura et al.
patent: 3960768 (1976-06-01), Ripperger et al.

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