Abstract
Ultrafine cemented carbides were prepared by microwave sintering using nano-WC and nano-Co powders as raw materials, multi-walled carbon nanotubes (MWCNTs) and graphene nanosheets (GNSs) as reinforcing materials. Effects of reinforcing materials on the microstructure and mechanical properties of cemented carbides were studied. After adding 0.2 wt% MWCNTs, the grain size of WC is relatively uniform, and the average grain size is about 500 nm. The Vickers hardness (1812) of the sample increases by 4.4%. After adding 0.2 wt% GNSs, the grain size of WC was not effectively inhibited and the Vickers hardness of the alloy was not improved.
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