The process and wear behavior of monolithic SiC and 10 vol.% short carbon fiber-SiC matrix (C-SiC) composite have been studied. The results indicate that, among ethyl alcohol, acetone, n-hexane and n-octyl alcohol, n-octyl alcohol was the most effective dispersing agent in dispersing both SiC powder and short carbon fiber. Among AlN, Al2O3, B4C, graphite, AIN/B4C, AIN/graphite, B4C/graphite and Al2O3/B40, the most effective sintering aid for the fabrication of SiC and C-SiC composite was a mixture of 2 wt% AIN and 0.5 wt% graphite. The monolithic SiC hot-pressed at 2100 °C exhibited higher density but lower flexural strength than those hot-pressed at 2000 °C due to a grain growth effect. For the C-SiC composite, both density and strength of the composite hot-pressed at 2100 °C were generally higher than those hot-pressed at 2000 °C. The density and strength of C-SiC composite were lower than those of monolithic SiC under the same hot pressing conditions due to a higher porosity level in the composite. When monolithic SiC slid against C-SiC composite, the weight losses of SiC and the composite were each less than that of self-mated SiC or self-mated C-SiC. In the self-mated SiC tribosystem, a mechanically stable film could not be established, resulting in an essentially constant wear rate. When sliding against C-SiC, a thin, smooth and adherent debris film was quickly formed on the SiC surface, resulting in a lower wear.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering