Robocasting entropy stabilised ultra-high temperature ceramic composites for hypersonic applications.

用于高超音速应用的机器人铸造熵稳定超高温陶瓷复合材料。

• 批准号: 2768482
• 金额: --
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2768482
• 关键词: Robocasting; entropy; stabilised; ultra; temperature

Sharp leading edges and nose cones are advantageous for flight control in hypersonic flight but suffer much higher temperatures than blunt ones. Hence enhanced flight control in the hypersonic regime requires materials capable of operating above 2000 C with minimal erosion/oxidation while also showing good thermal conductivity and thermal shock resistance. Ultra-high temperature ceramic matrix composites (UHTCMCs) are one of the few materials able to withstand this environment for prolonged periods overcoming the low toughness of monolithic UHTCs. Traditional methods of producing high-quality UHTCMCs such as liquid melt infiltration or chemical vapour infiltration are however time and cost-intensive. Robocasting, a form of additive manufacture in which a ceramic slurry/ink is deposited and cured as a net shape component, or pre-preg ply, prior to heat treatment to cross-link the binder material, is a novel and more affordable method of producing components that is under development by the CASC team. High entropy or entropy stabilised UHTCs are a new class of ceramic in which multiple transition metals typically found in UHTCs are combined into a single-phase crystalline solution. Early research has shown the potential performance of high entropy UHTCs to be greater than individual components with increased melting temperatures and oxidation resistance. This PhD proposal provides an exciting opportunity to combine the advances in robocasting and entropy-stabilised UHTCs to answer two key questions. 1. Is it feasible to convert 3D printed transition metal powders within a phenolic / carbon yielding resin into a densified UHTCMC matrix? And, 2. If multiple transition metal powders are combined in the same process can an entropy stabilised UHTCMC be produced with better thermo-mechanical properties than binary transition metal powders alone?

尖锐的前缘和头锥对于高超音速飞行中的飞行控制是有利的，但是比钝的前缘和头锥承受高得多的温度。因此，在高超音速范围内增强飞行控制要求材料能够在2000 ℃以上以最小的腐蚀/氧化工作，同时还表现出良好的导热性和抗热震性。超高温陶瓷基复合材料（UHTCMC）是少数几种能够长期承受这种环境的材料之一，克服了单片UHTCs的低韧性。然而，生产高质量UHTCMC的传统方法，如液体熔体渗透或化学气相渗透，是时间和成本密集型的。Robocasting是一种增材制造形式，其中陶瓷浆料/油墨在热处理以交联粘合剂材料之前沉积并固化为净形部件或预浸层，是一种新型且更经济实惠的生产组件的方法，该方法正在由CASC团队开发。高熵或熵稳定的UHTCs是一类新的陶瓷，其中通常在UHTCs中发现的多种过渡金属结合成单相结晶溶液。早期的研究已经表明，高熵UHTCs的潜在性能大于具有增加的熔化温度和抗氧化性的单个组分。这个博士的建议提供了一个令人兴奋的机会，结合联合收割机在自动铸造和熵稳定的UHTCs的进步，以回答两个关键问题。1.将酚醛/碳树脂中的3D打印过渡金属粉末转化为致密的UHTCMC基质是否可行？第二如果多种过渡金属粉末在同一工艺中组合，那么熵稳定的UHTCMC是否可以比单独的二元过渡金属粉末具有更好的热机械性能？