Effect of infiltrated eutectic AlSi on the microstructure and properties of C/C composites
| Autor: | Lei Liu, Xiyuan Yao, Wei Feng, Xiaotian Wei, Bo-yan Li, Wei Yang, Xingyu Chen, Yu Gao, Yong-chun Guo |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Mechanical Engineering Alloy Composite number 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure 01 natural sciences 0104 chemical sciences Mechanics of Materials Materials Chemistry Ceramics and Composites engineering Composite material 0210 nano-technology Porosity Eutectic system |
| Zdroj: | Journal of Composite Materials. 55:1349-1357 |
| ISSN: | 1530-793X 0021-9983 |
| DOI: | 10.1177/0021998320969794 |
| Popis: | Eutectic AlSi alloy was pressure infiltrated into a porous C/C skeleton to develop a low cost new C/C composite for application without extreme high temperature. C/C composite possessed a density of 1.7 g/cm3 was prepared for comparison. The effects of filling AlSi with and without Al-Ti-C grain refiner on the microstructure and properties of C/C composites were mainly studied. Result indicated that the introduced AlSi interpenetrated with C/C skeleton and made the composites compact. In comparison with C/C composite, the compressive strength and particle erosion resistance were greatly enhanced while the density and thermal expansion coefficient (CTE) increased slightly. After adding the refiner, Si network involved dendritic Al in C/C-AlSi was transformed to refined mixed AlSi, Al bulk and Si surrounded dendritic Al, and two kinds of micro-cracks came into being, which resulted in the decreased strength, improved erosion property and increased CTE of C/C-AlSiR. Both AlSi textures and micro-cracks in the modified C/C composites determined the crack propagation and led to their different compressive behaviors and anti-erosion abilities. |
| Databáze: | OpenAIRE |
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