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Composite thermal protection coating on woven silica fiber fabrics

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Abstract

A composite coating with inner and outer layers was prepared for the thermal protection of woven silica fiber fabrics. Using a sol mixture of a silica sol and AlF3/SiO2 particles mixed in the stoichiometric molar ratio for mullite, hollow silica spheres and short mullite fibers were added to the inner layer and outer layer, respectively. The phase composition and thermal evolution of the coating, along with the interfacial microstructure between the coating and the matrix, were characterized by means of X-ray diffraction, differential scanning calorimetry/thermogravimetry, scanning electron microscopy, and tensile strength testing. Mullite whiskers grew between 950°C and 1200°C and helped prevent thermal cracking during the drying and densification processes. The hollow silica spheres might play dual roles, weakening the adhesion between the coating and the fibers by reducing their direct contact, but strengthening the joining between the coating and substrate by embedding themselves among the fabrics.

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Authors and Affiliations

  1. Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China

    MengXia Liu, Shan Liu & JiaChen Liu

  2. Analysis and Measurement Center, Tianjin University, Tianjin, 300072, China

    Tao Xue

  3. Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials; College of Materials Science and Engineering, Hebei United University, Tangshan, 063009, China

    YingNa Zhao

Authors
  1. MengXia Liu
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  2. Tao Xue
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  3. YingNa Zhao
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  4. Shan Liu
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  5. JiaChen Liu
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Correspondence to JiaChen Liu.

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Liu, M., Xue, T., Zhao, Y. et al. Composite thermal protection coating on woven silica fiber fabrics. Sci. China Technol. Sci. 57, 1121–1126 (2014). https://doi.org/10.1007/s11431-014-5546-9

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  • DOI: https://doi.org/10.1007/s11431-014-5546-9

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