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Method for the electrolytic preparation of tungsten carbide.

Gomes-JM; Baker-DH Jr.; Uchida-K
U S Pat 3 589 987 1971 Jun; :
Coarse crystalline tungsten carbide was produced by electrolysis of a melt containing alkali tungstate 1, alkali halide 14-22, alkali hydroxide 1-1, and b2o3 0.8-1.2 Moles with a graphite anode at 1,000 deg.-1,050 Deg. C at a cathode current density of 10-150 a/dm2 and an anode C.D. of 3.5 A/dm2. At a b2o3/tungstate mole ratio of <1:8 no carbide is deposited; at a ratio of 1.5:1, W2c and w are deposited; and at a ratio of at least 2:1 w borides are formed. No deposit formed in the absence of b2o3. Below 1,000 deg. C excess carbon was deposited. The b could also be introduced as metaborate or tetraborate. For example, a melt containing na2wo4 1, nacl 14, naf 7, naoh 2, and b2o3 1 mole was electrolyzed at 1,000 deg. C, at a w cathode with a C.D. of 150 a/dm2 to form 99 pct pure wc, 15.9 G/cm3, particles 85 pct +60 mesh, in 85 pct yield based on na2wo4. The wc is useful for making cermets.
Publication Date
Document Type
Fiscal Year
NTIS Accession No.
NTIS Price
Identifying No.
PAT 3,589,987
NIOSH Division
Source Name
U.S. Pat. 3,589,987; June 29, 1971; Chem. Abstr. 75:83,590Q