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Citation: ZHENG Chun-Man, LIU Shi-Li, LI Xiao-Dong, WANG Hao, ZHAO Da-Fang. Properties and Mechanism of High Temperature Resistance of Continuous SiC(Al) Fibers[J]. Acta Physico-Chimica Sinica, ;2008, 24(06): 971-976. doi: 10.3866/PKU.WHXB20080609 shu

Properties and Mechanism of High Temperature Resistance of Continuous SiC(Al) Fibers

1.
Key Laboratory of Ceramic Fiber and Composites, School of Aerospace and Materials Engineering, National University of Defense Technology, Changsha 410073, P. R. China; The Fifth Academy of the Second Artillery Equipment Research Institute, Beijing 100085, P. R. China

Received Date: 28 January 2008
Available Online: 16 April 2008

Continuous SiC(Al) fibers were prepared by polymer-derived method using organometallic polymer polyaluminocarbosilane (PACS). The composition, structure, and properties of continuous SiC(Al) fibers were investigated by a series of analyses. The mechanism of high temperature resistance of the fibers was discussed through the comparison between Nicalon fibers and continuous SiC(Al) fibers. The results showed that the fibers exhibited excellent thermal stability. After heat treatment at 1800 ℃ in ar n for 1 h, the fibers maintained about 80% of the initial strength. Element analysis and 27Al MAS NMR indicated that the composition of continuous SiC(Al) fibers was close to stoichiometric ratio and the aluminum existed in the form of Al—O and Al—C bonds. The aluminum that existed in different manners could restrain the growth of grain of the fibers at super-high temperature. The high-temperature resistance of continuous SiC(Al) fibers was based on two factors: the near stoichiometric composition and the inhibition of the aluminumto the growth of the grain.
- High-temperature resistance; Continuous SiC(Al) fibers; Property; Mechanism
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