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Potential and limits of SiC chopped fiber-reinforced Ultra High Temperature Ceramics (Comunicazione a convegno)

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Potential and limits of SiC chopped fiber-reinforced Ultra High Temperature Ceramics (Comunicazione a convegno) (literal)

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D. Sciti, L. Silvestroni, S.Guicciardi, A. Bellosi (2012)
Potential and limits of SiC chopped fiber-reinforced Ultra High Temperature Ceramics
in 4th International Congress on Ceramics,, Chicago, Illinois US, July 15-19, 2012
(literal)

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Titolo

Potential and limits of SiC chopped fiber-reinforced Ultra High Temperature Ceramics (literal)

Abstract

Borides and carbides of early transition metals are considered a class of promising materials for several applications, the most appealing ones being in the aerospace and energy sectors. The present work is focused on toughening of UHTCs, which is a crucial issue that needs to be addressed for application in aerospace engineering. Common strategies to increase the fracture toughness include either incorporation of elongated reinforcement (SiC chopped fibers, SiC whiskers) or in-situ development of SiC platelet-reinforced materials. Addition of fibers or whiskers allows toughness to be increased from 3-4 MPa?m1/2 (for unreinforced materials) to 5.0-6.3 MPa?m1/2. On the other hand, quite often, the improvement of fracture toughness is accompanied by a decrease of strength, due to a change of the defects population. The high temperature behavior of fiber-reinforced materials is investigated, including mechanical properties and oxidation behavior in conventional furnaces up to 1700°C. Finally, the dynamic response to oxidation of sharp profile demonstrators is studied in plasma wind tunnel at temperatures around 1800°C. (literal)

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