Abstract
In the electrospark deposition (ESD) of WC-Co materials on low carbon steel, tungsten carbide (WC) decarburization is observed. The use of an inert atmosphere (argon) does not eliminate the problem of tungsten carbide decarburization during electrospark processing. The effect of the carbon concentration of electrode materials on the phase composition and mechanical properties of WC (10 wt% of Co) ESD coatings has been investigated in this work. The introduction of additional carbon (graphite) in the electrode material on the basis of the WC-10%Co leads to an increased amount of WC in the obtained coatings and thus improves their wear resistance.
Highlights
WC-Co alloys are widely used as electrode materials to deposit hardening coatings on metals by electrospark alloying [1,2,3,4]
The introduction of additional carbon in the electrode material on the basis of the WC-10%Co leads to an increased amount of WC in the obtained coatings and improves their wear resistance
1) Electrode materials with different carbon concentrations were prepared on the basis of WC-10%Co
Summary
WC-Co alloys are widely used as electrode materials to deposit hardening coatings on metals by electrospark alloying [1,2,3,4]. It is known that the tungsten carbide (WC) decomposes to W2C and tungsten under the discharge action, and the composition of the coating is different from the initial composition of the treating electrode, that is, the anode [5,6,7]. The decarburization of tungsten carbide reduces the wear resistance of coatings. With increasing power evolving at discharges, the W2C carbide content of the deposited coating increases [5]. If argon is applied as a protective environment for the electrospark processing, the degradation of the tungsten carbide WC decreases but only by a negligible amount
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