Improved fracture toughness of laminated ZrB2-SiC-MoSi2 ceramics using SiC whisker

Yuhang Bai, Mengyong Sun, Mingxing Li, Shangwu Fan, Laifei Cheng

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

In this study, SiC whisker (SiCw) was introduced to ZrB2 matrix layer of laminated ZrB2/BN ceramics to improve fracture toughness. Laminated ZrB2-SiCw/BN ceramics were prepared by tape casting and spark plasma sintering. For comparison, monolithic ZrB2-SiCw and laminated ZrB2-SiCp/BN ceramics were also prepared using the same method. The introduction of SiC whiskers increased fracture toughness of laminated ZrB2-SiCw/BN ceramics to 13.31 ± 0.33 MPa m1/2 for all samples. This was related to the multi-scale toughening mechanism, including delamination and crack deflection issued from the laminate structure at the macroscopic level, as well as whiskers bridging and pullout at the microscopic view. The R-curve behaviors of all samples revealed improved resistance to crack propagation of laminated ZrB2-SiCw/BN when compared to ZrB2-SiCp/BN and ZrB2-SiCw issued from multi-scale toughening design.

Original languageEnglish
Pages (from-to)8890-8897
Number of pages8
JournalCeramics International
Volume44
Issue number8
DOIs
StatePublished - 1 Jun 2018

Keywords

  • Fracture toughness
  • Laminated ZrB-SiC/BN ceramics
  • SiC whisker
  • Spark plasma sintering

Fingerprint

Dive into the research topics of 'Improved fracture toughness of laminated ZrB2-SiC-MoSi2 ceramics using SiC whisker'. Together they form a unique fingerprint.

Cite this