1456 D-S. Lim et al/Wear 251(2001)1452-1458 Fig. 8. SEM micrographs of worn surfaces at 673 K for(a) sample A, Fig. 10. SEM micrographs of worn surfaces at 873K for T20 samples (b) sample T10 and(c)sample T20 (a) sliding parallel with tape casting direction;( b) sliding normal with tape casting direction;(c)sliding normal with lamination direction. The results obtained in this study indicate that the addi- tion of whiskers has a beneficial effect on the friction and wear rate of SiC whisker reinforced alumina composites at high temperatures. Different tribological characteristics with increasing temperature were also shown for the mono- lithic alumina and the whisker reinforced alumina compos ites. These wear test results indicate that a different wear mechanism might have been involved at high temperatures for the sliding wear of silicon carbide whisker reinforced alumina composites. It has reported that the specific wear Fig. 9. Magnified view of Fig. 7(c) showing rolls on a film loss of alumina significantly decreased at the temperature1456 D.-S. Lim et al. / Wear 251 (2001) 1452–1458 Fig. 8. SEM micrographs of worn surfaces at 673 K for (a) sample A, (b) sample T10 and (c) sample T20. Fig. 9. Magnified view of Fig. 7(c) showing rolls on a film. Fig. 10. SEM micrographs of worn surfaces at 873 K for T20 samples: (a) sliding parallel with tape casting direction; (b) sliding normal with tape casting direction; (c) sliding normal with lamination direction. 4. Discussion The results obtained in this study indicate that the addi￾tion of whiskers has a beneficial effect on the friction and wear rate of SiC whisker reinforced alumina composites at high temperatures. Different tribological characteristics with increasing temperature were also shown for the mono￾lithic alumina and the whisker reinforced alumina compos￾ites. These wear test results indicate that a different wear mechanism might have been involved at high temperatures for the sliding wear of silicon carbide whisker reinforced alumina composites. It has reported that the specific wear loss of alumina significantly decreased at the temperature