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| Effect of fiber quality ratio on the properties of fiber porous ceramic composites |
| MO Chen1, XIANG Yang1, LUO Meng1, PENG Zhihang1, WEN Jin2, LIU Ping3, LI Hailong4 |
1. College of Aerospace Science, National University of Defense Technology, Changsha 410073, China;
2. Hunan Provincial Key Laboratory of Fine Ceramics and Powder Materials, Hunan University of Humanities, Science and Technology, Loudi 417000, China;
3. Xinxing Electronic Ceramics Co.,Ltd., Loudi 417600, China;
4. Rongrong New Materials Co.,Ltd., Shanghai 201306, China |
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Abstract Fiber porous ceramic composites are widely used in the field of thermal protection for aircraft due to their low density, low thermal conductivity, and relatively high compressive strength. This study used oxide fibers to prepare efficient thermal insulation materials, and prepared fiber porous ceramic composites with different fiber mass ratios (aluminosilicate and ultrafine quartz fibers) at different sintering temperatures. The influences of fiber mass ratio on the microstructure and macroscopic properties of the composites were investigated. X-ray computed tomography (X-CT) technology was introduced to achieve non-destructive characterization of the microstructure of composites. The interactive threshold analysis of the structure and the reconstruction of the fiber distribution were carried out by 3D reconstruction software, and fiber orientations were simulated using fiber tracking analysis. The results show that when the sintering temperature is relatively low (900-1 000 ℃), as the content of aluminosilicate fibers increases, the density of the composites increases, and the porosity is less affected, the compressive strength of the composites gradually decreases. When the sintering temperature is 900 ℃ and the mass fraction of aluminosilicate fibers is 20%, the compressive strength of the composites is 1.99 MPa; when the mass fraction increases to 45%, the compressive strength decreases to 0.80 MPa. When the sintering temperature is 1 200 ℃, significant damage occurrs to the strength of both fibers, resulting in a decrease in the compressive strength of the composites. The fiber distribution is not uniform in the micro area, and there are large pores in some areas, which are weak areas of strength and prone to failure.
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Received: 26 August 2024
Published: 05 February 2025
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2024, Vol. 29 
