Preparation of polymer-derived boron-containing silicon carbide fibers

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	Preparation of polymer-derived boron-containing silicon carbide fibers
	Xu, Min ; Zhang, Li ; Lu, Xuechuan ; Chen, Lifu ; Chen LF(陈立富)
刊名	http://dx.doi.org/CNKI:11-2310/TQ.20110726.1521.007
	2011
关键词	Boron Colloid chemistry Colloids Crosslinking Fibers Melt spinning Molecular mass Polysilanes Pyrolysis Silicon carbide Sintering Spinning (fibers) Tensile strength X ray diffraction
英文摘要	Dimethylamine borane (DMAB) was reacted with low-molecular mass polycarbosilane (LPCS) to form a boron-containing colloid. The colloid was then added into a high-molecular mass polycarbosilane (HPCS) to form a boron-containing polycarbosilane precursor. The precursor was melt-spun, oxidation cured, pyrolyzed and sintered at 1800°C to obtain boron-containing silicon carbide (SiC-B) fibers. Formation of the colloid as well as the composition and performance of SiC-B fibers were studied. Results show that the interaction between Si-H bond and B-H bond is responsible for the reaction of DMAB and LPCS, resulting in the chemical cross-linking of LPCS, and hence forming well-dispersed and highly-stable boron-containing colloids. Introduction of boron could effectively inhibit a rapid growth of SiC grains during sintering, improving fiber density and tensile strength. Surface of SiC-B fibers sintered at 1800°C is smooth and fracture surface is dense. Average tensile strength of SiC-B fibers is 0.8 GPa. Results by X-ray diffraction indicate that SiC-B fibers consist of mainly β-SiC crystals and a small amount of α-SiC. The average grain size of β-SiC is 17.8 nm.
语种	英语
出版者	Chinese Ceramic Society
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/87503]
专题	材料学院－已发表论文
推荐引用方式 GB/T 7714	Xu, Min,Zhang, Li,Lu, Xuechuan,et al. Preparation of polymer-derived boron-containing silicon carbide fibers[J]. http://dx.doi.org/CNKI:11-2310/TQ.20110726.1521.007,2011.
APA	Xu, Min,Zhang, Li,Lu, Xuechuan,Chen, Lifu,&陈立富.(2011).Preparation of polymer-derived boron-containing silicon carbide fibers.http://dx.doi.org/CNKI:11-2310/TQ.20110726.1521.007.
MLA	Xu, Min,et al."Preparation of polymer-derived boron-containing silicon carbide fibers".http://dx.doi.org/CNKI:11-2310/TQ.20110726.1521.007 (2011).