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首页> 外文期刊>Materials Science and Engineering >Mechanical and dielectric properties of 2.5D SiC_f/SiC-Al_2O_3 composites prepared via precursor infiltration and pyrolysis
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Mechanical and dielectric properties of 2.5D SiC_f/SiC-Al_2O_3 composites prepared via precursor infiltration and pyrolysis

机译：通过前驱体渗透和热解制备的2.5D SiC_f / SiC-Al_2O_3复合材料的力学和介电性能

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摘要

2.5D KD-1 SiC fabrics were employed to fabricate SiCf/SiC composites by a modified polymer infiltration and pyrolysis (PIP) process, using Al_2O_3 as inert filler. The effects of Al_2O_3 content on the microstructure, mechanical and dielectric properties of SiC_f/SiC-Al_2O_3 composites were investigated. The results reveal that the infiltration efficiency is remarkably improved by incorporating the Al_2O_3 filler into the PIP process. The Al_2O_3 filler can effectively compensate for volume shrinkage to form dense matrix and act as strengthening phase to deflect microcracks, thus a maximum flexural strength of 186 MPa is obtained when the Al_2O_3 content is 10 wt%, which is 75% higher than that of composites without filler (106 MPa). Both ε' and ε" of complex permittivity for the composites decrease as Al_2O_3 content increases from 0 to 20 wt%. With the incorporation of PyC interphase, the flexural strength of composites with 10 wt% Al_2O_3 filler is improved from 186 to 234 MPa, and its complex permittivity increases from 20.5-i15.5 to 43-i37.
机译：以Al_2O_3为惰性填料，采用改良的聚合物渗透和热解（PIP）工艺，采用2.5D KD-1 SiC织物制备SiCf / SiC复合材料。研究了Al_2O_3含量对SiC_f / SiC-Al_2O_3复合材料的组织，力学性能和介电性能的影响。结果表明，通过将Al_2O_3填料引入PIP工艺，可显着提高渗透效率。 Al_2O_3填料可以有效地补偿体积收缩，形成致密的基体，并起到使微裂纹偏转的强化相的作用，因此，当Al_2O_3含量为10 wt％时，最大弯曲强度为186 MPa，比复合材料高75％。不含填料（106 MPa）。随着Al_2O_3含量从0增加到20 wt％，复合材料的复介电常数ε'和ε“均降低。掺入PyC中间相，含10 wt％Al_2O_3填料的复合材料的弯曲强度从186 MPa提高到234 MPa，其复介电常数从20.5-i15.5增加到43-i37。

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  • 来源
    《Materials Science and Engineering》 |2014年第24期|64-70|共7页
  • 作者

    Yang Mu; Wancheng Zhou; Hongyu Wang; Chao Wang; Yuchang Qing;

  • 作者单位

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China;

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China;

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China;

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China;

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    SiC_f/SiC composites; PIP process; Al_2O_3 filler; Mechanical properties; Dielectric properties;

    机译：SiC_f / SiC复合材料;PIP过程;Al_2O_3填料;机械性能介电性能;

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