Reaction mechanism of SiC-TiSi<sub>2</sub> by melt infiltration method
The melt infiltration method is one of the main preparation method of SiC matrix composites. Complex reactions and multi-component diffusion are involved in molten-Si infiltration of a C-based preform. In this study, SiC-TiSi<sub>2</sub> was fabricated by Si melt infiltration and the TiS...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Journal of Materials Engineering
2019-06-01
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| Series: | Cailiao gongcheng |
| Subjects: | |
| Online Access: | http://jme.biam.ac.cn/CN/Y2019/V47/I6/88 |
| Summary: | The melt infiltration method is one of the main preparation method of SiC matrix composites. Complex reactions and multi-component diffusion are involved in molten-Si infiltration of a C-based preform. In this study, SiC-TiSi<sub>2</sub> was fabricated by Si melt infiltration and the TiSi<sub>2</sub> was <i>in-situ</i> formed in the matrix of SiC. In order to explore the reaction mechanism of SiC-TiSi<sub>2</sub>, SEM, EDS and micro-beam XRD were determined to characterize the phase constitute and micro-structure in different regions along the Si melt infiltration direction. The results demonstrate that SiC, TiSi<sub>2</sub> and Ti<sub>5</sub>Si<sub>3</sub> which concentrate on the Si/SiC interface are found to be formed through the Si melt infiltration into the C-TiC preform. With the increase of temperature, the liquid phase of Ti-Si appears when exceeding the Si-TiSi<sub>2</sub> eutectic temperature. And the liquid Ti-Si eutectic precipitates TiSi<sub>2</sub> in the Si region during the cooling period of the sample. Moreover, the isolated SiC grain in Si region is produced by the precipitation from the dissolution of solid C in liquid Si. |
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| ISSN: | 1001-4381 1001-4381 |