Abstract
Silicon carbide nanofibers grew on the surface of carbon fibers of a unidirectional carbon preform by CCVD and then chemical vapor infiltration was used to densify the preform to get the SiCNF-C/C composite. The effects of silicon carbide nanofibers on the microstructure of the pyrolytic carbon and the thermal conductivity of the SiCNF-C/C composite were investigated. Results show that silicon carbide nanofibers on the surface of carbon fibers induce the deposition of high texture pyrolytic carbon around them. The interface bonding between carbon fibers and pyrolytic carbon is well adjusted. So the efficiency of heat transfer in the interface of the composite is well enhanced. The thermal conductivity of the SiCNF-C/C composite is greater than that of the C/C composite, especially the thermal conductivity perpendicular to the fiber axis.
Highlights
Carbon/carbon (C/C) composite is a new-type of high-temperature material with lots of excellent performance, such as light weight, high modulus, high specific strength, low thermal expansion, high temperature resistance and outstanding corrosion resistance [1] [2]
Silicon carbide nanofibers grew on the surface of carbon fibers of a unidirectional carbon preform by chemical vapor deposition (CCVD) and chemical vapor infiltration was used to densify the preform to get the SiCNF-C/C composite
SiCNFs are prepared on the surface of carbon fibers by catalytic chemical vapor deposition (CCVD)
Summary
Carbon/carbon (C/C) composite is a new-type of high-temperature material with lots of excellent performance, such as light weight, high modulus, high specific strength, low thermal expansion, high temperature resistance and outstanding corrosion resistance [1] [2]. There are large heat accumulations in aerospace equipment during operation, such as powerful electron apparatus and plasma facing components of fusion devices. The excellent thermal properties of C/C composites are related to the performances of carbon fibers and matrix, and dependent on the fiber/ matrix interface [6] [7]. A good fiber/matrix interface is beneficial to heat transfer, while a weak interface may impair the integrity of composites and become the thermal resistance. Many investigations have been carried out to modify the fiber/matrix interface to get high performance C/C composites. Carbon nanofibers (CNFs) are widely used in C/C composites for interface modification due to their quasi-one-dimensional structure. SiCNFs are prepared on the surface of carbon fibers by catalytic chemical vapor deposition (CCVD).
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