Low temperature method for synthesizing micrograin tungsten carb

Details Low temperature method for synthesizing micrograin tungsten carb Low temperature method for synthesizing micrograin tungsten carb

1993-04-21

1994-12-13

Lewis, Michael

Chemistry of inorganic compounds

Carbon or compound thereof

Oxygen containing

423439, C01B 3134

Patent

active

053727975

ABSTRACT:
A method for forming monotungsten carbide, comprising heating a solid, non-elemental tungsten-containing material in a flowing atmosphere containing molecular hydrogen and molecular methane for a time sufficient to convert substantially all of the tungsten-containing material to monotungsten carbide, The heating brings the temperature of the tungsten-containing material to a first elevated temperature of from about 520 to about 550.degree. C. and, subsequently, at a rate of from about 3 to about 10.degree. C. per minute, the heating brings the temperature from the first elevated temperature to a second elevated temperature of about 800 to about 900.degree. C. Thereafter the temperature is held at the second elevated temperature for at least about 15 minutes. At least about 50 weight percent of the monotungsten carbide formed is formed while holding the temperature at the second elevated temperature.

REFERENCES:
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patent: 4460097 (1984-07-01), Hara et al.
patent: 4515763 (1985-05-01), Boudart et al.
patent: 4851206 (1989-07-01), Boudart et al.
Newkirk et al., "The Preparation of Tungsten Carbide", J. of American Society, 5 Sep. 1957, vol. 79, No. 17, pp. 4629-4631.

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