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首页> 外文期刊>Journal of the European Ceramic Society >Sintering behavior of SiO2 aerogel composites reinforced by mullite fibers via in-situ rapid heating TEM observations
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Sintering behavior of SiO2 aerogel composites reinforced by mullite fibers via in-situ rapid heating TEM observations

机译：SiO2气凝胶复合材料的烧结行为通过原位快速加热TEM观测由莫来石纤维加固

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摘要

The direct in situ TEM imaging method is adopted to investigate the sintering behavior of SiO2 aerogels during the rapid heating process. The structural evolution of SiO2 aerogels and composites at different times during the heat treatment process are further investigated via SEM, FT-IR, BET and XRD. The results indicate that the shrinkage of the SiO2 aerogels and composites primarily occurs during the initial stage of the heating process (within 20 min) with the shrinkage primarily linked to the fusion of small aerogel particles at high temperatures. The aerogel structure then stabilizes with no further shrinkage observed as the heating process continues. The heat treatment process only promotes the space rearrangement and fusion of small aerogel particles with no observed changes to the amorphous structure of the aerogels, and the small-sized particles fusion was the main causes for the structural evolution of SiO2 aerogels and composites under rapid heating condition.
机译：采用直接原位TEM成像方法来研究SiO2气凝胶在快速加热过程中的烧结行为。 通过SEM，FT-IR，BET和XRD进一步研究了在热处理过程中不同时间的SiO2气凝胶和复合材料的结构演变。 结果表明，SiO2气凝胶和复合材料的收缩主要发生在加热过程的初始阶段（在20分钟内），其收缩主要与在高温下的小气凝胶颗粒的融合中。 然后，由于加热过程继续，气凝胶结构没有观察到的进一步收缩。 热处理过程仅促进小气凝胶颗粒的空间重排和融合，没有观察到气凝胶的无定形结构的变化，并且小尺寸的颗粒融合是SiO2气凝胶和复合材料在快速加热下的结构演变的主要原因 健康）状况。

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  • 作者

    Cai Huafei; Jiang Yonggang; Chen Qu; Zhang Sizhao; Li Liangjun; Feng Junzong; Feng Jian;

  • 作者单位

    Natl Univ Def Technol Coll Aerosp Sci &

    Engn Sci &

    Technol Adv Ceram Fibers &

    Composites Lab Changsha 410073 Hunan Peoples R China;

    Natl Univ Def Technol Coll Aerosp Sci &

    Engn Sci &

    Technol Adv Ceram Fibers &

    Composites Lab Changsha 410073 Hunan Peoples R China;

    Univ Oxford Dept Mat Parks Rd Oxford OX1 3PH England;

    Natl Univ Def Technol Coll Aerosp Sci &

    Engn Sci &

    Technol Adv Ceram Fibers &

    Composites Lab Changsha 410073 Hunan Peoples R China;

    Natl Univ Def Technol Coll Aerosp Sci &

    Engn Sci &

    Technol Adv Ceram Fibers &

    Composites Lab Changsha 410073 Hunan Peoples R China;

    Natl Univ Def Technol Coll Aerosp Sci &

    Engn Sci &

    Technol Adv Ceram Fibers &

    Composites Lab Changsha 410073 Hunan Peoples R China;

    Natl Univ Def Technol Coll Aerosp Sci &

    Engn Sci &

    Technol Adv Ceram Fibers &

    Composites Lab Changsha 410073 Hunan Peoples R China;

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  • 正文语种 eng
  • 中图分类 陶瓷工业;
  • 关键词

    SiO2 aerogel; Sintering behavior; In-situ TEM; Shrinkage; Fusion;

    机译：SiO2气凝胶;烧结行为;原位TEM;收缩;融合;

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