| Abstract: | A binderless cemented carbide has been evaluated in abrasion and erosion tests. The binderless carbide was compared with:
SiC, Al2O3 and two conventional cemented carbides with 6% Co and different WC grain sizes (1 and 7 μm). In the abrasion tests, the materials
were ground with silica, silicon carbide and diamond particles in the size range of 5–15 μm. The erosion tests were performed
with 80, 200 and 600 μm silicon carbide erodents. The angle of impingement was 45° and the erodent velocity 70 m/s. In all
tests, the conventional cemented carbides showed the highest, the binderless cemented carbide an intermediate and the ceramics
the lowest wear resistance. Scanning electron and atomic force microscopy of the abraded surfaces revealed that the binderless
cemented carbide was worn by a preferential removal of TiC grains. In erosion, the wear mechanism was largely plastic for
the cemented carbides, whereas the ceramics were worn by micro-fracture. The SEM analysis also showed an impact scaling effect
for the cemented carbides in erosion.
This revised version was published online in August 2006 with corrections to the Cover Date. |
