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Type: 
Journal
Description: 
Ultra-high temperature ceramics, such as ZrB2, are convenient for application in hypersonic systems due to melting point higher than 3000 °C and excellent ablation resistance. For such application further improvement by addition of second phases, including SiC or CrB2, has additional benefits in domain of oxidation behavior, while TiB, doping reduces material's weight. A powder mixture of ZrB2, TiB2, CrB, and SiC was high energy ball-mill trough four steps. Obtained milled powder was subjected to hot pressing following different thermal cycles. Subsequent annealing was applied to remove oxide phases and reduce micro-cracking. Due to different thermal treatment, various microstructure and hardness occur. We reached fully dense ceramics, and with different oxide-phases content depending on sintering conditions. Maximal obtained hardness was 24 GPa. Ongoing activity regards the study of the strength and oxidation resistance to assess the suitability of this multi-phase system for hypersonic applications.
Publisher: 
Krakow: Agencja Reklamowa EURO GRAPHIC
Publication date: 
1 Jan 2022
Authors: 

Suzana Filipović, Nina Obradović, Nicola Gilli, Laura Silvestroni

Biblio References: 
Origin: 
Abstract in Europe/Ceramics in Europe 2022, Krakow, 10-14 July