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Advanced Opacified Fiber-Reinforced Silica-Based Aerogel Composites for Superinsulation of Exhaust Tubing Systems in Semi-Stationary Motors

机译:先进的不透明纤维增强二氧化硅基气凝胶复合材料用于半静态电机排气管系统的超绝热

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摘要

Within this study, monolithic three-dimensional silica aerogel (SA) composite parts with super insulating properties are presented. A generic part based on fiber-reinforced (FR) silica aerogel for thermal insulation of the exhaust tubing system—to keep the exhaust gases as hot as possible to improve the efficiency of the catalyst system—was produced via a sol-gel-based molding process in combination with a supercritical drying using scCO . A thermal conductivity of 16 mW m K was measured via a heat flow meter technique. In this manuscript, we present a full cycle of the material compound design, starting with fundamental material evaluation including aerogel optimization, opacifier influence, and casting process. The obtained generic part in shape of a half-shell for pipe insulation is characterized under real conditions.
机译:在这项研究中,提出了具有超绝热性能的整体式三维二氧化硅气凝胶(SA)复合部件。通过基于溶胶-凝胶的成型工艺生产了一种基于纤维增强(FR)二氧化硅气凝胶的通用部件,用于排气管系统的隔热-保持废气尽可能热以提高催化剂系统的效率。结合scCO的超临界干燥工艺。通过热流量计技术测得的热导率为16mW·m·K。在本手稿中,我们介绍了材料混合物设计的完整周期,从基本的材料评估开始,包括气凝胶优化,遮光剂影响和浇铸工艺。所获得的用于管道绝缘的半壳形状的通用零件是在实际条件下表征的。

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