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Recent achievements on fabrication, properties and arc-jet testing of sharp UHTC leading edges

机译:UHTC锋利尖端的制造,性能和电弧喷射测试的最新成就

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摘要

The present contribution is addressed to offer an overview of recent achievements on some borides-based composites that are conventionally classified as ultra-high temperature ceramics (UHTCs) for their extremely high melting points.UHTCs are actively studied as key enabling technology for thermal protection structures (TPS) like wing leading edges, surface control components to be applied in the next generation of space vehicles flying at hypersonic speed or/and re-entering the Earthu27s atmosphere: increased performances and better maneuvrability are gained only through the design of very sharp profile. Sharp wedges and test articles with blunter profiles were fabricated in the ZrB2 base system, using SiC particulate or SiC short fibers as second phase: microstruture and fundamental thermo-mechanical characteristics were determined. The dynamic response to oxidation of such UHTCs was studied under aero-thermal heating using high enthalpy supersonic flows in arc-jet plasma wind tunnel. Microstructural changes were analyzed and correlated to specimenu27s size and shape and test conditions through Computational Fluid Dynamics (CFD) simulations
机译:本贡献旨在概述一些基于硼化物的复合材料的最新成就,这些复合材料因其极高的熔点而传统上被归类为超高温陶瓷(UHTC).UHTC被积极研究为热保护结构的关键使能技术(TPS),如机翼前缘,表面控制组件,将以超音速飞行或/和重新进入地球大气层的下一代航天器中使用:只有通过非常合理的设计,才能获得更高的性能和更好的可操纵性轮廓鲜明。在ZrB2基本系统中,使用SiC颗粒或SiC短纤维作为第二相,制造了具有钝形轮廓的锋利楔形物和测试制品:确定了微结构和基本的热机械特性。在电弧加热等离子体风洞中使用高焓超音速气流在空气热加热下研究了此类UHTC的氧化动力学响应。通过计算流体动力学(CFD)模拟,分析了微结构变化并将其与样品的大小,形状和测试条件相关联

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