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首页> 外文期刊>Materials Science and Engineering >Influence of dip-coated boron nitride interphase on mechanical and dielectric properties of SiC_f/SiC composites
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Influence of dip-coated boron nitride interphase on mechanical and dielectric properties of SiC_f/SiC composites

机译：浸涂氮化硼中间相对SiC_f / SiC复合材料力学性能和介电性能的影响

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摘要

The utilization of urea and boric acid solutions as precursors via dip-coating method for synthesis of BN coatings on KD-I SiC fibers was demonstrated. The effects of precursor compositions of BN on coatings microstructure, coatings morphology, mechanical and dielectric properties of SiC_f/SiC composites were investigated. XRD, FT-IR and Raman spectra results show that the crystalline degree of t-BN decreases with urea and boric acid mole ratios increase from 3∶1 to 12∶1. The surface of as prepared BN coatings is smooth and its thickness is uniform when the ratio is higher than 6∶1. From mechanical properties measurements, the higher mole ratio helps to improve the flexural strength and fracture ductility of the composites. The flexural strength and failure displacement of SiC_f/SiC composites with 0.2 μm thickness BN interphase reach 278 MPa and 0.29 mm, which are both much higher than those of the composites without interphase, whose ultimate values are only 191 MPa and 0.13 mm, respectively. The flexural strength retention of the composites with BN interphase is higher than that of the composites with PyC interphase below 800 ℃ and there is no significant difference at higher temperatures. The BN coatings have little influence on the complex permittivity of SiC fabrics.
机译：证明了通过浸涂法将尿素和硼酸溶液用作前体在KD-1 SiC纤维上合成BN涂层的方法。研究了氮化硼前驱体组成对SiC_f / SiC复合材料涂层组织，涂层形貌，力学性能和介电性能的影响。 XRD，FT-IR和Raman光谱结果表明，t-BN的结晶度随尿素和硼酸摩尔比从3∶1增加到12∶1而降低。当比例大于6∶1时，所制备的BN涂层的表面光滑且厚度均匀。从机械性能测量中，较高的摩尔比有助于改善复合材料的弯曲强度和断裂延展性。厚度为0.2μm的BN相间的SiC_f / SiC复合材料的弯曲强度和破坏位移分别达到278 MPa和0.29 mm，远高于没有相间的SiC_f / SiC复合材料，其极限值分别仅为191 MPa和0.13 mm。在800℃以下，BN相的复合材料的弯曲强度保持率高于PyC相的复合材料的弯曲强度保持率，并且在较高的温度下无明显差异。 BN涂层对SiC织物的复介电常数几乎没有影响。

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  • 来源
    《Materials Science and Engineering》 |2013年第20期|72-79|共8页
  • 作者

    Yang Mu; Wancheng Zhou; Donghai Ding; Zhibin Huang; Fa Luo;

  • 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;

    College of Materials and Mineral Resources, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, 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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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Boron nitride interphase; Dip-coating; Mechanical properties; Dielectric properties; SiC_f/SiC composites;

    机译：氮化硼相间;浸涂;机械性能介电性能SiC_f / SiC复合材料;

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