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Preparation and Flame Ablation/Oxidation Behavior of ZrB2/SiC Ultra-High Temperature Ceramic Composites

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Abstract:

ZrB2/SiC ceramic composites reinforced by nano-SiC whiskers and SiC particles have been prepared by hot-pressing at 1950°C for 1hr under 20 MPa pressure in flow argon atmosphere. Effects of SiC addition on microstructure, mechanical properties and thermal ablation/oxidation behavior of ZrB2/SiC composites were investigated. The results showed that the addition of SiC effectively improved the densification of ZrB2/SiC composites and almost full dense ZrB2/SiC composites were obtained when the amount of SiC increased up to 20 vol%. Flexural strength and fracture toughness of the ZrB2/SiC composites were also enhanced; the maximum strength and toughness reached 600 MPa and 8.81 MPa·m1/2 at SiC additions of 20 vol % and 30 vol%, respectively. The composites possessed good resistance to flame ablation and could keep the whole shape without distinct peeling or cracking after flame ablation by oxyacetylene flame for 3 mins. The more SiC added, the better resistance to flame ablation the composites displayed.

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Periodical:

Key Engineering Materials (Volume 351)

Pages:

142-146

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.351.142

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Online since:

October 2007

Authors:

Chang An Wang, Hai Long Wang, Yong Huang, Dai Ning Fang

Keywords:

Flame Ablation, Mechanical Property, Ultra-High Temperature Ceramics (UHTC), ZrB2/SiC

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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