The effect of several factors on the amount of leached binder by electrolysis in WC-Co alloy

摘要

The present study has been performed to investigatethe effect of variation of binder content, WC grain size, carboncontent and TaC addition on the amount of leached binder in WC-Co alloy by electrolytic surface treatment. As the results, theamount of leached binder increases with increasing particle size ofWC raw material, binder phase content and carbon content becausethose factors increase leaching area by increasing the mean freepath(distance from a carbide to another carbide) of the alloy. Incase that TaC component is added upto 2 wt% in WC-Co alloys,the amount of leached binder decreases with increasing TaCcontent. The reason is that small addition of TaC to WC-Co alloyinhibits the grain growth of WC and therefore the alloy containingTaC has the finer grain size than that of TaC free alloy, whichresults in the decrease of mean free path of the alloy.