Oxidation of WC-Co, WC-Ni and WC-Co-Ni hard metals in the temperature range 500-800 deg C

Oxidation of WC-16% Co, WC-8% Co-8% Ni and WC-16% Ni hard metals in the temperature range between 500-800 deg C was investigated by TGA, XRD and SEM methods. The thermodynamics of tungsten carbide oxidation reactions was calculated. Oxidation kinetics of the alloys follows a complex behavior. The WC...

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Bibliographic Details
Published in:International journal of refractory metals & hard materials 1996-01, Vol.14 (4), p.289-295
Main Authors: Voitovich, V B, Sverdel, V V, Voitovich, R F, Golovko, E I
Format: Article
Language:English
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Summary:Oxidation of WC-16% Co, WC-8% Co-8% Ni and WC-16% Ni hard metals in the temperature range between 500-800 deg C was investigated by TGA, XRD and SEM methods. The thermodynamics of tungsten carbide oxidation reactions was calculated. Oxidation kinetics of the alloys follows a complex behavior. The WC-16% Co alloy is oxidized to a lesser degree than the WC-16% Ni alloy in the temperature range 650-800 deg C. Oxidation resistance of hard metals is governed by phase composition, formation mechanism of the scales and protective properties of the oxidation products (CoO, NiO, WO sub 3 and complex oxides, based on the formula (Ni,Co)WO sub 4 ).
ISSN:0263-4368