Academic Journal
Mo(Al x Si 1− x ) 2 healing particles for high temperature ceramics and encapsulation by selective oxidation of aluminium
| العنوان: | Mo(Al x Si 1− x ) 2 healing particles for high temperature ceramics and encapsulation by selective oxidation of aluminium |
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| المؤلفون: | Ding, Z. (author), Brouwer, J.C. (author), Kwakernaak, C. (author), Zhu, Jia-Ning (author), Popovich, V. (author), Hermans, M.J.M. (author), Sloof, W.G. (author) |
| سنة النشر: | 2023 |
| المجموعة: | Delft University of Technology: Institutional Repository |
| مصطلحات موضوعية: | Alumina scale growth, Encapsulation, Mo(Al,Si), Oxidation, Self-healing thermal barrier coatings |
| الوصف: | To prevent premature triggering of the healing reaction in Mo-Si containing self-healing thermal barrier coating system, an oxygen impenetrable shell (α-Al 2 O 3 ) around the sacrificial healing particles (MoSi 2 ) is desired. Here an encapsulation method is presented through selective oxidation of Al in Mo(Al x Si 1- x ) 2 particles. Healing particles of Mo(Al x Si 1- x ) 2 is designed in terms of alumina shell thickness, particle size and fraction Al dissolved. By replacing Si by Al in MoSi 2 up to the maximum solubility (x = 0.65) a strong crack healing ability is maintained (relative volume expansion ≥ 40 %). The formed exclusive α-Al 2 O 3 , featuring a two-layered structure, results from a counter-diffusion process along the grain boundaries, and its oxidation kinetics fits well with the 3D diffusion-Jander model. After 16 h exposure in gaseous ambient with a pO 2 of 5 × 10 -10 atm. at 1100 °C, a closed and dense shell of α-Al 2 O 3 is formed with a thickness of about 1.3 µm. The oxide shell produced under this condition provided healing particles with significantly improved stability upon exposure to high pO 2 of 0.2 atm. at 1100 °C for 50 h. The particles after exposure feature an inner core of MoSi 2 with Al completely consumed and an oxide shell of α-Al 2 O 3 . ; Team Marcel Hermans ; Team Maria Santofimia Navarro ; Team Vera Popovich ; Team Joris Dik |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | http://www.scopus.com/inward/record.url?scp=85145965806&partnerID=8YFLogxK; Materials & Design--0264-1275--e0763f05-6bad-4204-8c80-dddea13b2802; http://resolver.tudelft.nl/uuid:f4769729-0d99-4cf6-88d6-81e93809358d; https://doi.org/10.1016/j.matdes.2022.111577 |
| DOI: | 10.1016/j.matdes.2022.111577 |
| الاتاحة: | http://resolver.tudelft.nl/uuid:f4769729-0d99-4cf6-88d6-81e93809358d https://doi.org/10.1016/j.matdes.2022.111577 |
| Rights: | © 2023 Z. Ding, J.C. Brouwer, C. Kwakernaak, Jia-Ning Zhu, V. Popovich, M.J.M. Hermans, W.G. Sloof |
| رقم الانضمام: | edsbas.E40A286 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1016/j.matdes.2022.111577 |
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