WC-8wt.％Co cemented carbides with varied nano-Al2O3 and nano-ZrO2 contents were prepared respectively following conventional powder metallurgical procedures.Effects of nano-Al2O3 and nano-ZrO2 on the microstructure,behavior,and abrasive wear resistance were investigated.The result shows that a finer and more homogenous microstructure can be achieved by increasing nano-Al2O3,and increasing nano-ZrO2 makes the microstructure more refmed.Nano-Al2O3 and nano-ZrO2 could both help to give increased hardness.Transverse rupture strength is higher if the above nano-oxides are doped appropriately,whereas excess addition is deleterious.Abrasive wear resistance presents different variations with respect to increasing nano-Al2O3 and nano-ZrO2.By contrast,increasing nano-ZrO2 enhances the abrasive wear resistance more effectively than increasing nano-Al2O3.The influence of the two nano-oxides contents on the abrasive wear resistance does not almost vary with wear time,and the optimum addition level of nano-Al2O3 in WC-8％Co cemented carbide is 0.3 wt.％ from the stand of abrasive wear resistance.In addition,both of the nano-oxides can retard the increase of wear rate in long-term abrasive wear.
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