Title: Microstructure and mechanical properties of ZrB₂-based composites with laminated structure

Authors: Chang-An Wang, Hailong Wang, Lei Yu, Yong Huang

Addresses: State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China. ' State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China. ' State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China. ' State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Abstract: Laminated ZrB₂/SiC ceramic composites were fabricated through roll-compaction and hot-pressing. To improve the densification of SiC interlayers, a small amount of B and C were added into SiC interlayers. The results showed that the addition of B and C was beneficial to the densification of SiC layers and could avoid cracking from interlayers. The laminated composites showed the highest bending strength and nominal fracture toughness of 288 ± 32 MPa and 9.73 ± 0.43 Mpa m^1/2, respectively. The laminated structure mainly contributed to high toughness of the laminated ZrB₂/SiC composites through crack deflection along the interfacial layer repeatedly.

Keywords: ZrB2; zirconium diboride; silicon carbide; laminated composites; UHTCs; reinforcement; microstructure; mechanical properties; ceramic composites; roll compaction; hot pressing; bending strength; fracture toughness; crack deflection.

DOI: 10.1504/IJMPT.2010.031421

International Journal of Materials and Product Technology, 2010 Vol.37 No.3/4, pp.228 - 233

Published online: 03 Feb 2010 *

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