In order to improve interfacial bonding strength between carbon nanofibers (CNFs) and SiC matrix in CNFs/SiC composites and to disperse CNFs uniformly in the matrix, SiC coating on surface of CNFs was performed in argon atmosphere in the temperature range of 1400 to 1800°C using SiO 2 , SiO, and mixture of Si and SiO 2 powders (Si/SiO 2 powder) as silicon sources, and the modification and dispersibility of the treated CNFs were investigated. ¢-SiC particles were deposited on the surface of the CNFs in all the specimens at 16001800°C. So more SiC was formed by heating CNFs with SiO powder at 1600°C. However, the formed SiC was oxidized at higher temperature, practically, at 1800°C. This oxidation was advanced more by using SiO 2 and Si/ SiO 2 powders as silicon sources and very fine carbon fibers were observed on the surface of CNFs. The dispersibilities of CNFs heated with Si/SiO 2 and SiO powders were superior to those of as-received CNFs, CNFs treated with NaClO 3 solution and CNFs heated with SiO 2 powder, which resulted from the advanced oxidation of CNFs and the silanol group (SiOH) on surface of formed SiC.
To enhance the fracture toughness of silicon carbide (SiC) ceramics and prevent the generation of cracks and chippings in the SiC ceramics during machining process, carbon nanofibres (CNFs) were compounded with SiC. The densification and microstructure development of the CNFs/SiC composites pressureless sintered in Ar atmosphere were investigated. The fracture toughness of SiC ceramics was enhanced by the addition of 1–3 wt% CNFs, which resulted from the pullout and/or bridging effect of CNFs bonded much more closely with SiC. The addition of 3 wt% CNFs prevented the chippings from generating in the composite during precision machining process.
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