Improved fracture toughness of laminated ZrB2-SiC-MoSi2 ceramics using SiC whisker |
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Authors: | Yuhang Bai Mengyong Sun Mingxing Li Shangwu Fan Laifei Cheng |
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Affiliation: | Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China |
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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. |
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Keywords: | SiC whisker Fracture toughness Spark plasma sintering |
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