Preparation of three-dimensional braided carbon fiber reinforced mullite composites from a sol with high solid content
| Autor: | Wei Zhang, Ke-wei Dai, Qing-song Ma, Weiguo Mao |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Metals and Alloys Mullite 02 engineering and technology engineering.material Raw material 021001 nanoscience & nanotechnology Geotechnical Engineering and Engineering Geology Condensed Matter Physics 01 natural sciences Fracture toughness Coating Flexural strength 0103 physical sciences Materials Chemistry engineering Composite material 0210 nano-technology Porosity Solid content Mass fraction |
| Zdroj: | Transactions of Nonferrous Metals Society of China. 28:2248-2254 |
| ISSN: | 1003-6326 |
| DOI: | 10.1016/s1003-6326(18)64869-1 |
| Popis: | To prepare the three-dimensional braided carbon fiber reinforced mullite (3D C/mullite) composites, an Al2O3-SiO2 sol with a solid content of 20% (mass fraction) and an Al2O3/SiO2 mass ratio of 2:1 was selected as the raw material. Characteristics and mullitization of the sol were analyzed throughly. It is found that the formation of mullite is basically completed at 1300 °C and the gel powders exhibit favorable sintering shrinkage. The 3D C/mullite composites without interfacial coating were fabricated through the route of vacuum impregnation-drying-heat treatment. Satisfied mechanical properties with a flexural strength of 241.2 MPa and a fracture toughness of 10.9 MPa·m1/2 are obtained although the total porosity reaches 26.0%. Oxidation resistances of the composites at 1200, 1400 and 1600 °C were investigated. Due to the further densification of matrix, the 3D C/mullite composites show tiny mass loss and their mechanical properties are well retained after oxidation at 1600 °C for 30 min. |
| Databáze: | OpenAIRE |
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