http://www.cnr.it/ontology/cnr/individuo/prodotto/ID43623
Properties of slip-cast and pressureless sintered ZrB2-SiC composites (Articolo in rivista)
- Type
- Label
- Properties of slip-cast and pressureless sintered ZrB2-SiC composites (Articolo in rivista) (literal)
- Anno
- 2010-01-01T00:00:00+01:00 (literal)
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- Medri V.; Capiani C.; Bellosi A. (literal)
- Pagina inizio
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- Rivista
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- In: International Journal of Applied Ceramic Technology, vol. 1 pp. 1 - 9. The American Ceramic Society, 2010. (literal)
- Note
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- CNR-ISTEC, Faenza (literal)
- Titolo
- Properties of slip-cast and pressureless sintered ZrB2-SiC composites (literal)
- Abstract
- In view of the perspective to produce near-net shapes of ultra-refractory ceramics, ZrB2-SiC composite were produced by slip casting on plaster mould and pressureless sintered at 2150°C with holding time of 120 minutes, using silicon nitride as sintering aids. After sintering, slip cast samples reached a very high relative density over 98%, while, for comparison, the density of cold isostatic pressed samples was about 94%. Traces of the formation of secondary phases such as B4C, graphite, BN were found in all samples, while no grain boundary phases were revealed. RT flexural strength of as-sintered slip cast bars was affected by the presence of an external porous layer of coarse ZrB2 particles, while at 1500°C flexural strength increased, as a glassy layer sealed the superficial defects. Due to the absence of softening grain boundary phases, sub-critical crack growth did not occur during high temperature strength tests (literal)
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