Reactive hot pressing route for dense ZrB2-SiC and ZrB2-SiC-CNT ultra-high temperature ceramics

Oleksii Popov, Jozef Vleugels, Eldar Zeynalov, Vladimir Vishnyakov

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The in-situ exothermic reactions between ZrC0.8, B4C and Si have assisted densification and allowed to obtain fully dense ZrB2-31 wt.%SiC ultra-high temperature ceramics within 6 min at 1750 °C. The use of zirconium carbide instead of metallic zirconium in the green body obviated the possibility of in-situ SHS process and allowed to apply the pressure at low temperatures. The latter provided a first densification stage just above 1050 °C. A slight carbon excess was created in the green body to preserve the carbon nanotubes. The developed reactive hot pressing route (1830 °C, 3 min, 30 MPa) has been successfully used to obtain ZrB2-SiC ceramics containing 8 vol.% of multi-wall carbon nanotubes (MW-CNT). The carbon nanotubes survived the thermal cycle and could be clearly observed in the sintered ceramics. The CNT addition improved the fracture toughness of the composite from 4.3 MPa m1/2 for ZrB2-31 wt.%SiC to 6.8 MPa m1/2 for ZrB2-29 wt.%SiC-CNT.

Original languageEnglish
Pages (from-to)5012-5019
Number of pages8
JournalJournal of the European Ceramic Society
Volume40
Issue number15
Early online date17 Jul 2020
DOIs
Publication statusE-pub ahead of print - 17 Jul 2020

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