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首页> 外文期刊>CERAMICS INTERNATIONAL >Preparation and structure control of a scalelike MoSi2-borosilicate glass coating with improved contact damage and thermal shock resistance
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Preparation and structure control of a scalelike MoSi2-borosilicate glass coating with improved contact damage and thermal shock resistance

机译：具有改进的接触损伤和热抗震性耐热性MOSI2-硼硅酸盐玻璃涂层的制备和结构控制

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摘要

The scalelike coatings with MoSi2 as emittance agent, flake fused quartz as coarse fillers, silica sol as dispersive medium of coating slurry, were prepared on rigid mullite fibrous ceramics to avoid fatal radial cracks and improve thermal shock resistance via combining slurry method with sol-gel method. And the particle size distribution of fused silica was changed to get different crack structure in scalelike coatings. Microstructure and phase composition of the coatings with different crack structure were investigated comprehensively. Contact damage resistance, thermal shock resistance and infrared radiating property were also studied. The results showed that only the coatings with mixing large and small particles of fused silica as coarse fillers could form crack network. The scalelike coatings with crack network went through 25 thermal cycles between 1500 degrees C and room temperature without peeling and spalling, and the bonding strength did not decrease after test. The scalelike structure with crack network also avoided radial cracks and exhibited some softness and less stiffness in Hertzian indentation test. The emissivity of coatings with different crack structure were all higher than 0.85; and the coatings with lower proportion of crack areas had higher emissivity.
机译：用MOSI2作为掺杂剂的鳞片状涂层，作为粗填料的鳞片熔化石英，作为涂料浆料的分散介质，在刚性莫来石纤维陶瓷上制备，以避免致命的径向裂缝，并通过用溶胶 - 凝胶组合浆料方法改善热抗震性能方法。熔融二氧化硅的粒度分布改变以在鳞片状涂层中获得不同的裂缝结构。全面研究了具有不同裂缝结构的涂层的微观结构和相组合。还研究了接触抗损伤性，耐热抗冲击性和红外辐射性能。结果表明，只有与粗填料混合大型和小颗粒的涂层可以形成裂缝网络。具有裂缝网络的缩小涂层在1500℃和室温下进行了25个热循环而不剥离和剥落，并且测试后的粘合强度不会降低。具有裂缝网络的缩小结构也避免了径向裂缝，并且在赫兹凹口试验中表现出一些柔软性和更少的刚度。具有不同裂缝结构的涂层的发射率均高于0.85;裂缝区域比例较低的涂层具有较高的发射率。

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  • 来源
    《CERAMICS INTERNATIONAL》 |2020年第6期|共9页
  • 作者

    Wu Jinyu; Xu Xiaojing; Xiong Yanli; Guan Xingyu; Jiao Mengyu; Yao Xinghe; Hu Xiaoxia; Xu Shunyi; Tao Xin; Du Haiyan;

  • 作者单位

    Tianjin Univ Sch Mat Sci &

    Engn Minist Educ Key Lab Adv Ceram &

    Machining Technol Tianjin 300072 Peoples R China;

    China Acad Launch Vehicle Technol Syst Engn Business Dept Beijing 100076 Peoples R China;

    China Acad Launch Vehicle Technol Syst Engn Business Dept Beijing 100076 Peoples R China;

    Tianjin Univ Sch Mat Sci &

    Engn Minist Educ Key Lab Adv Ceram &

    Machining Technol Tianjin 300072 Peoples R China;

    Tianjin Univ Sch Mat Sci &

    Engn Minist Educ Key Lab Adv Ceram &

    Machining Technol Tianjin 300072 Peoples R China;

    China Acad Launch Vehicle Technol Syst Engn Business Dept Beijing 100076 Peoples R China;

    Tianjin Univ Sch Mat Sci &

    Engn Minist Educ Key Lab Adv Ceram &

    Machining Technol Tianjin 300072 Peoples R China;

    Tianjin Univ Sch Mat Sci &

    Engn Minist Educ Key Lab Adv Ceram &

    Machining Technol Tianjin 300072 Peoples R China;

    Civil Aviat Univ China Coll Sci Tianjin 300300 Peoples R China;

    Tianjin Univ Sch Mat Sci &

    Engn Minist Educ Key Lab Adv Ceram &

    Machining Technol Tianjin 300072 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 陶瓷工业;硅酸盐工业;
  • 关键词

    Scalelike MoSi2-Glass coating; Slurry and sol-gel process; Crack structure; Mechanical properties;

    机译：缩放MOSI2-玻璃涂料;浆料和溶胶 - 凝胶工艺;裂缝结构;机械性能;

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