炭素短繊維分散炭化ケイ素複合材料の作製と摺動特性

抄録

Carbon short fibers with high graphite content were added into a submicron SiC powder and consolidated by hot-pressing to prepare SiC/C composite materials. With the amount of added carbon fibers varying between 0 and 20 vol%, all samples could be densified to relative densities over 98%. The incorporation of carbon short fibers resulted in improved fracture toughness but degraded bending strength of the composites, and such effects were more obvious with increasing amount of carbon fibers. The tribological properties of the materials were studied using block-on-ring sliding tests at normal loads of 5 and 50 N. While the SiC/C composites always showed good wear resistance, their friction behaviors were different when tested under low and high load conditions. Under low load conditions, the added carbon fibers did not bring about any lubricating effect. Under high load conditions, the friction coefficients of the SiC/C composites were obviously lower than that of the monolithic SiC.