Abstract
SiO2f/SiO2 composites were prepared by compression molding and sintering using short-cut quartz fibers as reinforcement. The effects of fiber volume fraction (15%∼35%) on bulk density, apparent porosity, and mechanical and thermal properties of the composites were investigated. The results indicated that the samples with 25% fiber volume fraction had the best comprehensive performance, with an apparent porosity and compressive strength of 36% and 46.3 MPa, respectively. The flexural strength of the samples was 13.9 MPa, which represented a 90% increase compared to the samples without fibers. It was attributed to the occurrence of fiber debonding and fiber pull-out in the porous matrix. Meanwhile, the residual strength ratio of the samples after 20 thermal shocks was 74.8%. In addition, the average coefficient of thermal expansion was 0.95 × 10− 6/℃ at 300 ℃∼700 ℃ and the thermal conductivity was 0.388 W·m− 1·K− 1 at 800 °C. This approach can satisfy the requirements of low cost, fast preparation of SiO2f/SiO2 composites, which offers the prospect of its application in the integration of load-bearing and thermal insulation.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (NO. 52272027 and 52372034), Key R&D Project in Shaanxi Province (2022GY-421, 2023-YBGY-421 and 2023-GHZD-51) and Guangdong Benlang New Materials Technology Co. The authors acknowledge Dr. Chaowei Guo and Dr. Peng Zhang, Center for Advancing Materials Performance from the Nanoscale of Xi’an Jiaotong University, for their assistance with the SEM observations. The authors would like to thank Ms. Yunqin Gao and Xing Hou for their guidance on experimental methods.
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Ding, D., Ding, W., Jiao, J. et al. Effects of volume fraction of short-cut quartz fibers on mechanical and thermal properties of SiO2f/SiO2 composites. J Aust Ceram Soc (2024). https://doi.org/10.1007/s41779-024-01034-6
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DOI: https://doi.org/10.1007/s41779-024-01034-6