4.7 Article

Thermally stimulated self-healing capabilities of ZrB2-SiC ceramics

期刊

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 41, 期 15, 页码 7423-7433

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2021.08.012

关键词

UHTCs; ZrB2; Microstructure; Self-healing capability; Retained flexural strength

资金

  1. European Union's Horizon 2020 research and innovation programme [685594]

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The study prepared a group of ZrB2-SiC ceramics by hot-pressing and added Y2O3, tested their self-healing capabilities in high-temperature oxidizing environment, and evaluated the self-healing efficiency by measuring the strength recovery rates.
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.% Y2O3 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.

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