D-S. Lim et al/Wear 251(2001)1452-1458 2,2x1 of sample A, which had no whisker, slightly increased with increasing test temperatures. However, the friction coeffi- cients of samples with 10 and 20 vol. whiskers decreased 1.8x1 with increasing wear test temperatures. At 873K, a decrease 1.6x10 in friction with increasing whisker content was noticeable 1.4x10 Fig 4 shows the variation of wear rate with wear test temp 1.2x1 atures and whisker contents. A sharp increase of wear even 1,0x10 at 673 K is noticeable for sample A, The wear rates of sam 8.0×10 ples with 10 and 20 vol. whiskers were slightly increased 6.0x10 with increasing test temperatures. The wear rates tested above 673 K tended to decrease with increasing whisker 2.0x10° contents T10 and T20 show different friction coefficients depend hiker Content(vol % ing on the whisker orientation and sliding direction. A 403K the lowest friction coefficient was obtained for t10 Fig. 4. Wear rate of the alumina-Sic whisker composite as a function of but higher friction for T20 in the direction normal for the whisker conten tape casting direction, as shown in Fig. 5. However, the orientation effect on the friction coefficient tested at 873K diminishes for both T10 and T20 samples. The wear rate also depends on the sliding direction with respect to the 403K Z873k 403K 1.4x1 Z873K 0.4 d8.0x10 0x10 0.0 N Whisker orientation Whisker orientation 0.7 Z873K 1,4x10 2873K 0000 hiker orientation Whisker orientation (b) Fig. 5. Effect of whisker orientation on friction coefficients of (a)sample Fig. 6. Effect of whisker orientation of wear rate of(a)sample T1O an TI0 and (b) sample T20 worn at 403 and 873K (b)sample T20 worn at 403 and 873K1454 D.-S. Lim et al. / Wear 251 (2001) 1452–1458 Fig. 4. Wear rate of the alumina–SiC whisker composite as a function of whisker content. Fig. 5. Effect of whisker orientation on friction coefficients of (a) sample T10 and (b) sample T20 worn at 403 and 873 K. of sample A, which had no whisker, slightly increased with increasing test temperatures. However, the friction coeffi- cients of samples with 10 and 20 vol.% whiskers decreased with increasing wear test temperatures. At 873 K, a decrease in friction with increasing whisker content was noticeable. Fig. 4 shows the variation of wear rate with wear test temper￾atures and whisker contents. A sharp increase of wear even at 673 K is noticeable for sample A. The wear rates of sam￾ples with 10 and 20 vol.% whiskers were slightly increased with increasing test temperatures. The wear rates tested above 673 K tended to decrease with increasing whisker contents. T10 and T20 show different friction coefficients depend￾ing on the whisker orientation and sliding direction. At 403 K, the lowest friction coefficient was obtained for T10, but higher friction for T20 in the direction normal for the tape casting direction, as shown in Fig. 5. However, the orientation effect on the friction coefficient tested at 873 K diminishes for both T10 and T20 samples. The wear rate also depends on the sliding direction with respect to the Fig. 6. Effect of whisker orientation of wear rate of (a) sample T10 and (b) sample T20 worn at 403 and 873 K