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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Continuous silica fiber reinforced silica composites densified by polymer-derived silicon nitride: Mechanical properties and microstructures
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Continuous silica fiber reinforced silica composites densified by polymer-derived silicon nitride: Mechanical properties and microstructures

机译：聚合物衍生的氮化硅致密化的连续二氧化硅纤维增强二氧化硅复合材料：力学性能和微观结构

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Continuous silica glass fiber reinforced silica composites were prepared via silica sol suspension infiltration/sintering method followed by densification treatment by preceramic polymer infiltration/pyrolysis process, and the mechanical properties and microstructures of the composites were investigated. Pyrolyzed at 873 K in ammonia atmosphere, the preceramic polymer polyhydridornethylsilazane resulted in a low-carbon near-stoichiometric ceramic with an empirical formula of Si1.0N1.38C0.01O0.04H0.78. After the densification treatment, the density of the composites increased a little from 1.64 g/cm(3) to 1.79 g/cm(3), and the flexural strength increased greatly from 69.4 MPa to 95.9 MPa. However, the densified composites exhibited a tendency to brittle failure due to the relatively strong interfacial bonding between the glass fibers and polymer-derived silicon nitride, and also the degradation of glass fibers during post-treatment. (c) 2006 Elsevier B.V. All rights reserved.
机译：采用硅溶胶悬浮液渗透/烧结法制备连续的二氧化硅玻璃纤维增​​强二氧化硅复合材料，然后通过陶瓷前体聚合物渗透/热解工艺进行致密化处理，研究了复合材料的力学性能和微观结构。在氨气气氛中于873 K高温下热解，该预陶瓷聚合物聚甲基丙烯酸乙基硅氮烷生成了具有化学式Si1.0N1.38C0.01O0.04H0.78的低碳近化学计量陶瓷。致密化处理后，复合材料的密度从1.64 g / cm（3）略微增加到1.79 g / cm（3），弯曲强度从69.4 MPa大大增加到95.9 MPa。然而，由于玻璃纤维与聚合物衍生的氮化硅之间的相对较强的界面结合，并且在后处理期间玻璃纤维的降解，致密化的复合物表现出脆性破坏的趋势。 （c）2006 Elsevier B.V.保留所有权利。

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