Mechanochemical process for producing fine WC/CO composite powde

Details Mechanochemical process for producing fine WC/CO composite powde Mechanochemical process for producing fine WC/CO composite powde

1997-07-25

1999-03-16

Wyszomierski, George

Specialized metallurgical processes, compositions for use therei

Processes

Producing or purifying free metal powder or producing or...

75358, 75359, 419 31, 419 32, B22F 926

Patent

active

058823760

ABSTRACT:
A mechanochemical process for producing fine WC/Co composite powder which is so small in WC grain size and in mean free path, and contains such a uniform distribution of WC and Co that its hard metal is superior in strength, compressive strength, TRS and wear resistance and considerably free of impurities. The method comprises the steps of drying an ammonium metatungstate--Co(NO.sub.3).sub.2 solution in a spray dry manner to give initial powder of porous spheroids or in a common manner to give a cake of initial powder, removing the salts and humidity from the initial powder by a thermal treatment, mixing and milling the desalted initial powder with carbon black, and subjecting the mixed powder to reduction/carburization in a reactor.

REFERENCES:
patent: 5230729 (1993-07-01), McCaudlish et al.
patent: 5338330 (1994-08-01), Polizzotti et al.
patent: 5352269 (1994-10-01), McCaudlish et al.
J. Bukowiecki et al., Catalytic Formation of Tungsten Carbide through Gas-Phase Reaction, Planseeberichte, Bd. 28 at 216-21 (1980).
B.K. Kim et al., Sintering and Microstructure of Nanophase WC/Co Hardmetals (date unknown).
II K. Ushijima, Preparation of WC-Co Powder by Direct Carburisation of WO3 in the presense of Co3 O4, Powder Metallurgy, vol. II, No. 4 (1979).
T.D. Halliday et al., Thermodynamic Considerations of the Production of Cobalt/Tungsten Carbide Mixture by Direct Gas Phase Reduction/Carburisation Reactions, Industrial Use of Thermochemical Data at 291-300 (date unknown).

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