Effect of graphite flake on the mechanical properties of hot pressed ZrB2-SiC ceramics

Xinghong Zhang; Zhi Wang; Xin Sun; Wenbo Han; Changqing Hong

doi:10.1016/j.matlet.2008.07.027

Effect of graphite flake on the mechanical properties of hot pressed ZrB₂-SiC ceramics

Xinghong Zhang, Zhi Wang^*, Xin Sun, Wenbo Han, Changqing Hong

^*Corresponding author for this work

Harbin Institute of Technology

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

117 Citations (Scopus)

Abstract

A ZrB₂ ceramic containing 20 vol.% SiC and 10 vol.% graphite flake (ZrB₂-SiC-G) was fabricated by hot pressing. It was shown that the fracture toughness was improved due to the introduction of graphite flake, whereas the flexure strength and hardness decreased slightly. The fracture toughness of ZrB₂-SiC-G composite was 6.1 ± 0.3 MPa·m^1/2, which was much higher than that of monolithic ZrB₂, ZrB₂-SiC composite and similar ZrB₂-SiC-C composite. The toughening mechanisms are crack deflection and branching as well as stress relaxation near the crack tip. The results here pointed to a potential method for improving fracture toughness of ZrB₂-based ceramics.

Original language	English
Pages (from-to)	4360-4362
Number of pages	3
Journal	Materials Letters
Volume	62
Issue number	28
DOIs	https://doi.org/10.1016/j.matlet.2008.07.027
Publication status	Published - 15 Nov 2008
Externally published	Yes

Keywords

Graphite flake
Mechanical properties
Microstructure
ZrB-SiC

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10.1016/j.matlet.2008.07.027

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title = "Effect of graphite flake on the mechanical properties of hot pressed ZrB2-SiC ceramics",

abstract = "A ZrB2 ceramic containing 20 vol.\% SiC and 10 vol.\% graphite flake (ZrB2-SiC-G) was fabricated by hot pressing. It was shown that the fracture toughness was improved due to the introduction of graphite flake, whereas the flexure strength and hardness decreased slightly. The fracture toughness of ZrB2-SiC-G composite was 6.1 ± 0.3 MPa·m1/2, which was much higher than that of monolithic ZrB2, ZrB2-SiC composite and similar ZrB2-SiC-C composite. The toughening mechanisms are crack deflection and branching as well as stress relaxation near the crack tip. The results here pointed to a potential method for improving fracture toughness of ZrB2-based ceramics.",

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author = "Xinghong Zhang and Zhi Wang and Xin Sun and Wenbo Han and Changqing Hong",

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TY - JOUR

T1 - Effect of graphite flake on the mechanical properties of hot pressed ZrB2-SiC ceramics

AU - Zhang, Xinghong

AU - Wang, Zhi

AU - Sun, Xin

AU - Han, Wenbo

AU - Hong, Changqing

PY - 2008/11/15

Y1 - 2008/11/15

N2 - A ZrB2 ceramic containing 20 vol.% SiC and 10 vol.% graphite flake (ZrB2-SiC-G) was fabricated by hot pressing. It was shown that the fracture toughness was improved due to the introduction of graphite flake, whereas the flexure strength and hardness decreased slightly. The fracture toughness of ZrB2-SiC-G composite was 6.1 ± 0.3 MPa·m1/2, which was much higher than that of monolithic ZrB2, ZrB2-SiC composite and similar ZrB2-SiC-C composite. The toughening mechanisms are crack deflection and branching as well as stress relaxation near the crack tip. The results here pointed to a potential method for improving fracture toughness of ZrB2-based ceramics.

AB - A ZrB2 ceramic containing 20 vol.% SiC and 10 vol.% graphite flake (ZrB2-SiC-G) was fabricated by hot pressing. It was shown that the fracture toughness was improved due to the introduction of graphite flake, whereas the flexure strength and hardness decreased slightly. The fracture toughness of ZrB2-SiC-G composite was 6.1 ± 0.3 MPa·m1/2, which was much higher than that of monolithic ZrB2, ZrB2-SiC composite and similar ZrB2-SiC-C composite. The toughening mechanisms are crack deflection and branching as well as stress relaxation near the crack tip. The results here pointed to a potential method for improving fracture toughness of ZrB2-based ceramics.

KW - Graphite flake

KW - Mechanical properties

KW - Microstructure

KW - ZrB-SiC

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DO - 10.1016/j.matlet.2008.07.027

M3 - Article

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SN - 0167-577X

VL - 62

SP - 4360

EP - 4362

JO - Materials Letters

JF - Materials Letters

IS - 28

ER -

Effect of graphite flake on the mechanical properties of hot pressed ZrB₂-SiC ceramics

Abstract

Keywords

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