Wear Behavior in Micro and Nano-Structured Wc-9co-0.7vc Cemented Carbide Produced By Rapid Hot Press Sintering

Wear behavior in micro and nano-structured cemented carbide was compared. tungsten carbide, cobalt and vanadium carbide powders were milled by high energy planetary ball mill. microscopic observation and crystallite size calculation showed that crystallite size and particle size of powders were achieved less than 100 nano meters after milling at 15:1 ball powder ratio during 20 h. micro and nano-sized wc-9co-0.7vc powders were compacted at 30 mpa pressure and sintered at 1300 °c for 2 mints in rapid hot pressing process. metallographic study by scanning electron microscopy demonstrated that wc particle size remained in nano-scale after sintering. sliding friction test was carried out in a pin-on-disk system. the results showed that further wear resistance in nano-structured hard-metal was because of changes in the mechanism of material removal. it must be said that wear mechanism in hard-metals was abrasion / adhesion. it seemed that in micro-structured hard-metal, abrasion was more effective than adhesion, and vice versa in nano-structured hard-metal.