Efficient fabrication of light C f/SiHfBOC composite with excellent thermal shock resistance and ultra-high temperature ablation up 1800 °C

IF 18.6 1区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS
Yang Lyu, Zhihong Han, Guangdong Zhao, Yuan Cheng, Shanbao Zhou, Xinghong Zhang, Guiqing Chen, Wenbo Han
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Abstract

In this paper, a high-yield Hf-modified SiHfBOC ceramic precursor was developed, and a high-pressure assisted impregnation pyrolysis method was proposed to achieve the preparation of 3D PyC-Cf/SiHfBOC composites. This high-pressure assisted impregnation method significantly improves the impregnation filling effect of the precursor in and between fiber bundles compared to dozens of traditional impregnation cycles. After undergoing just 9 PIP cycles, the composites achieved a relative density of approximately 90% and a density of 1.64 g/cm3. The critical temperature difference of 3D PyC-Cf/SiHfBOC composites after the shock of RT-1000 °C is as high as 650 °C, which is twice that of the traditional ceramic material, showing good thermal shock resistance. Under the effect of Hf modification, a dense HfO2-SiO2 oxide layer (thickness 93μm) was formed in situ on the surface of the 3D PyC-Cf/SiHfBOC composites, effectively preventing further erosion of the composite matrix by high-temperature oxidation gas. Even in the ultra-high temperature oxygen-containing environment at 1800 °C, it still exhibits an excellent non-ablative result (with a linear ablation rate of 0.83×10-4 mm·s-1). This work not only enriches the basic research on lightweight ultra-high temperature ceramic composites converted from Hf ceramic precursors but also provides strong technical support for their application in ultra-high temperature non-ablative thermal protection materials for high-speed aircraft.
高效制备轻质C - f/SiHfBOC复合材料,具有优异的抗热震性能和高达1800℃的超高温烧蚀性能
本文开发了一种高产率的hf改性SiHfBOC陶瓷前驱体,并提出了高压辅助浸渍热解方法来实现三维PyC-Cf/SiHfBOC复合材料的制备。与传统的数十次浸渍相比,这种高压辅助浸渍方法显著提高了前驱体在纤维束内和束间的浸渍填充效果。经过9次PIP循环后,复合材料的相对密度达到约90%,密度为1.64 g/cm3。3D PyC-Cf/SiHfBOC复合材料在RT-1000℃冲击后的临界温差高达650℃,是传统陶瓷材料的两倍,表现出良好的抗热冲击性能。在Hf改性作用下,三维PyC-Cf/SiHfBOC复合材料表面原位形成致密的HfO2-SiO2氧化层(厚度93μm),有效地阻止了高温氧化气体对复合材料基体的进一步侵蚀。即使在1800℃的超高温含氧环境下,仍能表现出优异的非烧蚀效果(线性烧蚀速率为0.83×10-4 mm·s-1)。这项工作不仅丰富了Hf陶瓷前驱体转化的轻质超高温陶瓷复合材料的基础研究,而且为其在高速飞机超高温非烧蚀热防护材料中的应用提供了强有力的技术支持。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Advanced Ceramics
Journal of Advanced Ceramics MATERIALS SCIENCE, CERAMICS-
CiteScore
21.00
自引率
10.70%
发文量
290
审稿时长
14 days
期刊介绍: Journal of Advanced Ceramics is a single-blind peer-reviewed, open access international journal published on behalf of the State Key Laboratory of New Ceramics and Fine Processing (Tsinghua University, China) and the Advanced Ceramics Division of the Chinese Ceramic Society. Journal of Advanced Ceramics provides a forum for publishing original research papers, rapid communications, and commissioned reviews relating to advanced ceramic materials in the forms of particulates, dense or porous bodies, thin/thick films or coatings and laminated, graded and composite structures.
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