Ortona, Alberto and Bianchi, Giovanni and Cornolti, Luca and Martinelli, Simone (2018) Microwave heating controlled reactive melt infiltration for graphite‐Si‐SiC ceramics manufacturing. Journal of the American Ceramic Society. ISSN 1551-2916
Full text not available from this repository.Abstract
In this work, we investigated a procedure which exploits microwave ovens to produce SiC‐ based components by reactive melt infiltration of silicon into graphite preforms. The employed oven is designed to grant optical access to the sample surface, which allows to measure its temperature evolution though a noncontact pyrometer. This signal was used as a feedback to control the power provided to the preform and as an experimental output whose analysis provides insight into the reaction mechanism. Specifically, it is found that complete infiltration is achieved much before the end of the reaction. The latter is not fully self‐sustained as the global reaction rate continuously decreases with time until it is no more able to keep the temperature above the silicon solidification value. At that point, the reaction stops. The analysis of the processed samples proved that this procedure allows producing fully infiltrated samples without material failure by adjusting the heat provided during the infiltration stage rather than by tuning the preform structure and composition, which is the usual approach. The proposed method is less time and energy consuming than the standard one.
| Item Type: | Scientific journal article, Newspaper article or Magazine article |
|---|---|
| Subjects: | Engineering Engineering > Mechanical engineering |
| Department/unit: | Dipartimento tecnologie innovative > Istituto di ingegneria meccanica e tecnologia dei materiali |
| Depositing User: | Marco Pelanconi |
| Date Deposited: | 25 Jun 2020 19:25 |
| Last Modified: | 25 Jun 2020 19:25 |
| URI: | http://repository.supsi.ch/id/eprint/11674 |
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