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 language | English |
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Pages (from-to) | 8890-8897 |
Number of pages | 8 |
Journal | Ceramics International |
Volume | 44 |
Issue number | 8 |
DOIs | |
State | Published - 1 Jun 2018 |
Keywords
- Fracture toughness
- Laminated ZrB-SiC/BN ceramics
- SiC whisker
- Spark plasma sintering