| Auteur | Rechercher : Yazdani Sarvestani, H.1; Rechercher : Mirkhalaf, M.1; Rechercher : Yang, Q.1; Rechercher : Jakubinek, M. B.2; Rechercher : Ashrafi, B.1 |
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| Affiliation | - Conseil national de recherches du Canada. Aérospatiale
- Conseil national de recherches du Canada. Technologies de sécurité et de rupture
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| Format | Texte, Article |
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| Conférence | 70th International Astronautical Congress, IAC 2019, October 21-25, 2019, Washington, USA |
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| Sujet | hardness; modulus; nano/micro-indentation; nanoparticles; polymer-derived ceramics; toughness |
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| Résumé | Polymer-derived ceramics (PDCs) address the shaping limitations of traditional ceramic processing techniques and result in near-net-shape manufacturing of ceramics with complex geometries. One of the major limitations of PDCs is their brittleness. In this study, different concentrations of active fillers (silicon nitride and alumina nanoparticles) were added to a preceramic polymer resin (polysilazane, PSZ), which was subsequently thermally cross-linked and pyrolyzed under hydrostatic pressure. Nano/micro indentation measurements show that adding silicon nitride nanoparticles improved the fracture toughness of the PDCs up to ~ 3 times and adding alumina nanoparticles improved the modulus and hardness of the PDCs up to ~ 1.5 and 2.6 times, respectively. The ceramics made with sufficient concentration of active fillers have clearly lower void content than unfilled PSZ, which is attributed to the expected reaction of these nanoparticles with pyrolysis by-products. The ceramics developed in this study show interesting combinations of properties and can easily take different shapes. |
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| Date de publication | 2019-10-21 |
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| Maison d’édition | International Astronautical Federation |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | aff571a8-b121-49d2-932f-146931afd817 |
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| Enregistrement créé | 2021-03-22 |
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| Enregistrement modifié | 2021-09-17 |
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