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Preparation of homogeneous mullite‐based fibrous ceramics by starch consolidation
Journal of the American Ceramic Society ( IF 3.9 ) Pub Date : 2018-02-06 , DOI: 10.1111/jace.15441
Wenjie Zang 1, 2 , Tao Jia 1 , Xue Dong 3 , Jiachen Liu 1 , Haiyan Du 1 , Feng Hou 1 , Anran Guo 1
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Silica sol is one of the frequently used binders in high‐temperature resisting fibrous porous ceramics, but in the drying process, it can diffuse with water and influence the uniformity of ceramics. To solve this diffusion problem and fabricate homogeneous fibrous porous ceramics, cationic starch was firstly introduced in mullite fibrous system. The effects of starch content and high‐temperature binder content on microstructure, physical, and mechanical properties were also investigated. The results indicate that starch consolidated mullite fibrous ceramics owned a homogeneous 3D skeleton structure, since the introduced starch can absorb both water and silica particles by gelatinization and ensure the even distribution of binders. Compared with the mullite fibrous ceramics fabricated without starch addition, starch consolidated ceramics owned better microstructure and higher interior compression strength. Furthermore, both the starch and silica sol content had great impact on the microstructure, density, porosity, thermal conductivity, and compressive strength of the fibrous ceramic.

中文翻译:

通过淀粉固结制备均质莫来石基纤维陶瓷

硅溶胶是耐高温纤维状多孔陶瓷中常用的粘合剂之一,但在干燥过程中,它会与水扩散并影响陶瓷的均匀性。为了解决该扩散问题并制造均质的纤维状多孔陶瓷,首先将阳离子淀粉引入莫来石纤维体系中。还研究了淀粉含量和高温粘结剂含量对微观结构,物理和机械性能的影响。结果表明,淀粉固结的莫来石纤维陶瓷具有均匀的3D骨架结构,因为引入的淀粉可通过糊化作用吸收水和二氧化硅颗粒,并确保粘合剂的均匀分布。与不添加淀粉的莫来石纤维陶瓷相比,淀粉固结的陶瓷具有更好的微观结构和更高的内部抗压强度。此外,淀粉和硅溶胶的含量对纤维陶瓷的微观结构,密度,孔隙率,热导率和抗压强度都有很大的影响。
更新日期:2018-02-06
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