| The present study has been performed to investigate the effect of variation of binder content, WC grain size, carbon content and TaC addition on the amount of leached binder in WC-Co alloy by electrolytic surface treatment. As the results, the amount of leached binder increases with increasing particle size of WC raw material, binder phase content and carbon content because those factors increase leaching area by increasing the mean free path(distance from a carbide to another carbide) of the alloy. In case that TaC component is added upto 2 wt% in WC-Co alloys, the amount of leached binder decreases with increasing TaC content. The reason is that small addition of TaC to WC-Co alloy inhibits the grain growth of WC and therefore the alloy containing TaC has the finer grain size than that of TaC free alloy, which results in the decrease of mean free path of the alloy. |
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