Performance Optimization of Sol-Derived C/Mullite Composites by Reducing the Sintering Shrinkage of Mullite Matrix

IF 2.3 4区材料科学 Q3 MATERIALS SCIENCE, COMPOSITES

Applied Composite Materials Pub Date : 2024-04-22 DOI:10.1007/s10443-024-10227-y

Wei Zhang, Qingsong Ma, Kuanhong Zeng, Weiguo Mao

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Abstract

C/Mullite composites were fabricated through sol impregnation-drying-heating (SIDH) route using the sol with a high solid content in our previous work, and the composites showed desirable performance. However, it was found that thermal stress caused by sintering shrinkage of mullite matrix is one of the main factors leading to the performance regression of the composites. In present study, the sintering characteristic of Al₂O₃-SiO₂ sol was modified to reduce the thermal stress caused by the sintering shrinkage of mullite matrix, optimizing the performance of the composites. The results showed that the sintering shrinkage of mullite matrix was reduced about 25% after heat treatment at 1600ºC by modifying the sintering characteristic of sol, resulting in that the thermal stress caused by sintering shrinkage of mullite matrix was reduced effectively. Therefore, the strength, modulus and fracture work of the composites were increased by about 19.4%, 24.5% and 24.9% to 318.4 MPa, 62.0 GPa and 6958 J/m², respectively. Furthermore, thermal stability of the composites was also improved obviously in Ar and vacuum environment.

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通过降低莫来石基体的烧结收缩率优化溶胶法 C/莫来石复合材料的性能

在我们之前的工作中，通过溶胶浸渍-干燥-加热（SIDH）途径，使用高固含量的溶胶制造了碳/莫来石复合材料，复合材料表现出了理想的性能。但研究发现，莫来石基体烧结收缩引起的热应力是导致复合材料性能退步的主要因素之一。本研究改变了 Al2O3-SiO2 溶胶的烧结特性，以降低莫来石基体烧结收缩引起的热应力，优化复合材料的性能。结果表明，通过改变溶胶的烧结特性，莫来石基体在 1600ºC 热处理后的烧结收缩率降低了约 25%，从而有效降低了莫来石基体烧结收缩引起的热应力。因此，复合材料的强度、模量和断裂功分别提高了约 19.4%、24.5% 和 24.9%，达到 318.4 MPa、62.0 GPa 和 6958 J/m2。此外，复合材料在氩气和真空环境下的热稳定性也得到了明显改善。

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来源期刊

Applied Composite Materials 工程技术-材料科学：复合

CiteScore

4.20

自引率

4.30%

发文量

审稿时长

1.6 months

期刊介绍： Applied Composite Materials is an international journal dedicated to the publication of original full-length papers, review articles and short communications of the highest quality that advance the development and application of engineering composite materials. Its articles identify problems that limit the performance and reliability of the composite material and composite part; and propose solutions that lead to innovation in design and the successful exploitation and commercialization of composite materials across the widest spectrum of engineering uses. The main focus is on the quantitative descriptions of material systems and processing routes. Coverage includes management of time-dependent changes in microscopic and macroscopic structure and its exploitation from the material''s conception through to its eventual obsolescence.