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http://dx.doi.org/10.4191/kcers.2019.56.5.04

Effect of SiC Nanorods on Mechanical and Thermal Properties of SiC Composites Fabricated by Chemical Vapor Infiltration  

Lee, Ho Wook (Advanced Materials Research Division, Korea Atomic Energy Research Institute)
Kim, Daejong (Advanced Materials Research Division, Korea Atomic Energy Research Institute)
Lee, Hyeon-Geun (Advanced Materials Research Division, Korea Atomic Energy Research Institute)
Kim, Weon-Ju (Advanced Materials Research Division, Korea Atomic Energy Research Institute)
Yoon, Soon Gil (Department of Material Science and Engineering, Chungnam National University)
Park, Ji Yeon (Advanced Materials Research Division, Korea Atomic Energy Research Institute)
Publication Information
Journal of the Korean Ceramic Society / v.56, no.5, 2019 , pp. 453-460 More about this Journal
Abstract
To reduce residual pores of composites and obtain a dense matrix, SiCf/SiC composites were fabricated by chemical vapor deposition (CVI) using SiC nanorods. SiC nanorods were uniformly grown in the thickness direction of the composite preform when the reaction pressure was maintained at 50 torr or 100 torr at 1,100℃. When SiC nanorods were grown, the densities of the composites were 2.57 ~ 2.65 g/㎤, higher than that of the composite density of 2.47 g/㎤ for non-growing of SiC nanorods under the same conditions; grown nanorods had uniform microstructure with reduced large pores between bundles. The flexural strength, fracture toughness and thermal conductivity (room temperature) of the SiC nanorod grown composites were 412 ~ 432 MPa, 13.79 ~ 14.94 MPa·m1/2 and 11.51 ~11.89 W/m·K, which were increases of 30%, 25%, and 25% compared to the untreated composite, respectively.
Keywords
$SiC_f/SiC$; SiC nanorod; Densification; Mechanical property; Thermal property;
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