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Preparation and characterization of continuous high-temperature resistant Si-Al-C fibers by one-step method

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Abstract

Using polymer-derived technology, continuous high-temperature resistant Si-Al-C fibers were prepared by one step method, which included melt-spinning of polyaluminocarbosilane (PACS), curing of continuous PACS fibers, and sintering of the cured products. The results show that the average diameter and tensile strength of continuous Si-Al-C fibers are 11 to 12 μm and 1.8 to 2.0 GPa, respectively. The chemical formula of Si-Al-C fibers is SiC1.01O0.0400Al0.024, which is nearly stoichometric. The fibers are mainly composed of β-SiC crystalline, small amount of α-SiC, and amorphous SiC. Continuous Si-Al-C fibers exhibit excellent thermal stability. When the fibers were exposed in argon for 1 h, the tensile strength did not decrease until 1500°C. After heat treatment at 1800°C in argon for 1 h, the fibers maintained about 80% of the initial strength. It was higher than that of Nicalon and Hi-Nicalon fibers.

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Authors and Affiliations

  1. School of Aerospace and Materials Engineering, National University of Defense Technology, Changsha, 410073, China

    ChunMan Zheng, XiaoDong Li, Hao Wang, DaFang Zhao & TianJiao Hu

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  1. ChunMan Zheng
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  2. XiaoDong Li
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  3. Hao Wang
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  4. DaFang Zhao
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  5. TianJiao Hu
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Correspondence to ChunMan Zheng or XiaoDong Li.

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Supported by the National Natural Science Foundation of China (Grant No. 59972042)

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Zheng, C., Li, X., Wang, H. et al. Preparation and characterization of continuous high-temperature resistant Si-Al-C fibers by one-step method. Sci. China Ser. E-Technol. Sci. 51, 1425–1432 (2008). https://doi.org/10.1007/s11431-008-0106-9

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  • DOI: https://doi.org/10.1007/s11431-008-0106-9

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