AI 中文总结
该研究开发了镱稳定氧化锆超高温热防护涂层，通过“异常固溶体”协同机制实现了超卓耐温性能，为超高温陶瓷体系的成分设计提供了新思路。
AI 中文摘要
大气环境中超高温陶瓷（UHTCs）的高温性能从根本上由其氧化产物的熔点决定。典型的高熔点氧化物如ZrO2在高温下会发生相变，导致结构不稳定。尽管掺杂稀土或过渡金属阳离子可抑制这些相变，但通常会导致熔点降低，从而限制实际使用温度。本研究通过大气等离子喷涂制备了镱稳定氧化锆（YbSZ）涂层，将ZrO2的熔点显著提高至约2850℃，并将其耐等离子体和氧乙炔烧蚀的极限温度分别提升至近2780℃和3200℃，这是目前已报道的最高耐温性能。值得注意的是，该性能提升源于离子-共价混合键增强与氧空位稳定性提高的协同机制。基于这些发现，本研究首次提出将“异常固溶体”概念应用于超高温防护领域，为UHTC体系的成分设计提供了新视角。
英文摘要
The high-temperature performance of ultra-high temperature ceramics (UHTCs) in atmospheric environment is fundamentally governed by their melting points of oxidation products. Typical high-melting-point oxides, such as ZrO2, undergo phase transformations at elevated temperatures, leading to structural instability. Although doping with rare-earth or transition-metal cations can suppress these transformations, it often results in a reduction in melting point, thereby limiting practical service temperature. Here, ytterbia-stabilized zirconia (YbSZ) coatings are prepared via atmospheric plasma spraying, achieving a remarkable increase in the melting point of ZrO2 to approximately 2850 $^\circ\mathrm{C}$ and raising the ultimate plasma and oxyacetylene ablation temperature up to nearly 2780 $^\circ\mathrm{C}$ and 3200 $^\circ\mathrm{C}$, which is the highest temperature resistance property as reported. Notably, this performance enhancement originates from a synergistic mechanism of strengthened ionic-covalent mixed bonding and improved oxygen vacancy stability. Based on these findings, the concept of "anomalous solid solution" is firstly proposed to be used in the area of ultra-high temperature protection, which provides new insights into the compositional design of UHTC systems.
