Boron-carbon-doped silicon carbide fibers: preparation and property

【Author】

YU Han-Qing;DONG Zhi-Jun;YUAN Guan-Ming;CONG Ye;LI Xuan-Ke;LUO Yong-Ming

【Institution】

The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology;The Hubei Province Key Laboratory of Coal Conversion & New Carbon Materials, Wuhan University of Science and Technology;The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology;The Hubei Province Key Laboratory of Coal Conversion & New Carbon Materials, Wuhan University of Science and Technology;The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology;The Hubei Province Key Laboratory of Coal Conversion & New Carbon Materials, Wuhan University of Science and Technology;The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology;The Hubei Province Key Laboratory of Coal Conversion & New Carbon Materials, Wuhan University of Science and Technology;Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology, Hunan University;Institute of Chemistry, Chinese Academy of Sciences

【Abstract】

The B-C-doped SiC precursor was obtained by blending of PCS, PSNB and DSP at low temperature. The resulted precursor was melt-spun into precursor fibers. The B-C-doped silicon carbide fibers were finally obtained by pre-oxidation and heat treatment with high temperature of the precursor fibers successively. The composition and microstructure of B-C-doped SiC precursor and its fibers were characterized by IR, XRD and SEM. The effects of the heat-treatment temperature on the composition, structure, mechanical property and oxidation resistance were studied. The results show that the introduction of boron in SiC fibers restrains the growth of SiC grains at high-temperature treatment effectively, and simultaneously improves the thermal stability of the C-doped SiC fibers. The B-C-doped silicon carbide fibers obtained by heating the pre-oxidized fibers at 1 600 °C are mainly composed of β-SiC and a small amount of O, B and N. The B-C-doped SiC fibers own better oxidation resistance than the C-doped SiC fibers, which can be attributed to the formation of the borosilicate film during the high-temperature oxidation of the B-C-doped SiC fibers. This film plays a role effectively in preventing the pith carbon in the doped fibers from oxidation.

【Keywords】

polycarbosilance;polyborosilazane;doping;SiC fiber;anti-oxidation

References

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Total: 15 articles

  • [1] SONG Yongcai WANG Juan FENG Chunxiang (Institute of Aerospace and Meterials Engineering, National University of Defence Technology, Changsha 410073), Preparation of SiC-C fiber by polycarbosilane synthesized by co-pyrolysis of PDMS and PVC, Chinese Journal of Materials Research,
  • [2] BAN Guo-dong;LIU Zhao-hui;YE Sheng-tian;WANG Fei;JIA Yi-fan;DING Yi-dong;LIN Rui;Department of Chemistry & Material Engineering,LEU;, Research Progress of New Radar Absorbing Coating, Surface Technology,
  • [3] YANG Lian;LI Yang;HONG Liu;CHEN Lu;MA Long;School of Materials and Architecture Engineering,Guizhou Normal University;, Research Progress on Functional Silicon Carbide Fibers, Journal of Synthetic Crystals,
  • [4] YUAN Qin;SONG Yong-Cai;Science and Technology on Advanced Ceramic Fibers and Composites Laboratory,National University of Defense Technology;, Effect of SiC_xO_y Decomposition on Densification of SiCO(Al) Fibers during Sintering Process, Journal of Inorganic Materials,

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