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

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

doi:10.1016/j.ceramint.2018.02.078

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

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

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

Research output: Contribution to journal › Article › peer-review

51 Scopus citations

Abstract

In this study, SiC whisker (SiC_w) was introduced to ZrB₂ matrix layer of laminated ZrB₂/BN ceramics to improve fracture toughness. Laminated ZrB₂-SiC_w/BN ceramics were prepared by tape casting and spark plasma sintering. For comparison, monolithic ZrB₂-SiC_w and laminated ZrB₂-SiC_p/BN ceramics were also prepared using the same method. The introduction of SiC whiskers increased fracture toughness of laminated ZrB₂-SiC_w/BN ceramics to 13.31 ± 0.33 MPa m^1/2 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-SiC_w/BN when compared to ZrB₂-SiC_p/BN and ZrB₂-SiC_w issued from multi-scale toughening design.

Original language	English
Pages (from-to)	8890-8897
Number of pages	8
Journal	Ceramics International
Volume	44
Issue number	8
DOIs	https://doi.org/10.1016/j.ceramint.2018.02.078
State	Published - 1 Jun 2018

Keywords

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

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10.1016/j.ceramint.2018.02.078

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title = "Improved fracture toughness of laminated ZrB2-SiC-MoSi2 ceramics using SiC whisker",

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.",

keywords = "Fracture toughness, Laminated ZrB-SiC/BN ceramics, SiC whisker, Spark plasma sintering",

author = "Yuhang Bai and Mengyong Sun and Mingxing Li and Shangwu Fan and Laifei Cheng",

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AU - Bai, Yuhang

AU - Sun, Mengyong

AU - Li, Mingxing

AU - Fan, Shangwu

AU - Cheng, Laifei

PY - 2018/6/1

Y1 - 2018/6/1

N2 - 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.

AB - 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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KW - Spark plasma sintering

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

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