Skin effect of WC-8 wt Co alloy by microwave sintering

摘要

To investigate the microwave effect on the WC–Co alloys,WC–8 wt%Co alloy was fabricated by microwave sintering(MWS)in this paper.The results show that decarburization layer forms on the surface of the microwave-sintered samples.WC grain coarsening in the core area is strongly suppressed by the decarburization effect.In addition,the microstructure of the MWS-fabri-cated alloy was compared to that of the alloy sintered by vacuum sintering(VS).Microstructural investigations by transmission electron microscopy(TEM)and energy dis-persive spectroscopy(EDS)show that more tungsten(29.50 wt%)is dissolved in the cobalt binder phase in microwave-sintered alloy than that in the vacuum-sintered samples.Finally,the formation mechanism of the surface layer by skin effect was discussed.