Thermally stimulated self-healing capabilities of ZrB2-SiC ceramics. Issue 15 (December 2021)

• Record Type: Journal Article
• Authors: Monteverde, F.; Saraga, F.; Reimer, T.; Sciti, D.
• Is Part Of: Journal of the European Ceramic Society. Volume 41:Issue 15(2021)
• Page Start: 7423
• Page End: 7433
• Publication Date: 2021-12
• Subjects: UHTCs -- ZrB2 -- Microstructure -- Self-healing capability -- Retained flexural strength; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2021.08.012
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: The ultrahigh temperature ceramic-matrix composites (UHTCMCs) are the core class of innovative materials. One of the key-features that such a new class of materials should exhibit is self-repair of damage without any external intervention. In the present work, a set of ZrB2 -SiC ceramics (SiC from 5 to 15 vol.%) was produced by hot-pressing: besides SiC, also 5 vol.% Y2 O3 was added in the starting mixture to search for an improved self-healing capability (SH). Dedicated set-ups to thermally stimulate samples in severely oxidizing atmosphere up to 2278 K were designed and realized. To assess the SH capabilities, the retained flexural strengths were measured at room temperature using samples damaged by indentations and then heat treated from 1773 K to 2278 K. The strength recovery rates were measured and correlated to the SH efficiency.