Mechanical properties and toughening mechanisms of ZrO2 toughened Al2O3 ceramics

Huilan Ren; Bo Long; Jianguo Ning; Liang Chu

doi:10.13801/j.cnki.fhclxb.20140620.001

Mechanical properties and toughening mechanisms of ZrO₂ toughened Al₂O₃ ceramics

Huilan Ren^*, Bo Long, Jianguo Ning, Liang Chu

^*Corresponding author for this work

School of Mechatronical Engineering

Beijing Institute of Technology

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

13 Citations (Scopus)

Abstract

Mechanical properties and toughening mechanisms of three ceramics, 99.5vol% Al₂O₃ (AD995) ceramic, ZrO₂(15vol%)/Al₂O₃ ceramic and ZrO₂(25vol%)/Al₂O₃ ceramic prepared by hot pressing sintering were investigated by experimental and theoretical research. Based on the micro-mechanics theory of composites, a micromechanical constitution model was developed to describe mechanical properties of ZrO₂/Al₂O₃ considering phase transformation of ZrO₂. The results show that the grain size of Al₂O₃ matrix decreases and densification is improved with addition of ZrO₂. The failure of three ceramic specimens show characteristic of small deformation to brittle failure. The compression stress-strain curves show an approximately linear relationship. The fracture toughness of AD995 ceramic is 5.65 MPa·m^1/2, while ZrO₂(25vol%)/Al₂O₃ is 8.42 MPa·m^1/2, approximately 50% improvement.With toughening phase ZrO₂ content increasing, elastic modulus of ZrO₂/Al₂O₃ decreases and fracture toughness increases, which are consistent with experimental results.

Original language	English
Pages (from-to)	776-781
Number of pages	6
Journal	Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica
Volume	32
Issue number	3
DOIs	https://doi.org/10.13801/j.cnki.fhclxb.20140620.001
Publication status	Published - 1 Jun 2015

Keywords

AlO
Ceramic
Fracture toughness
Toughening mechanisms
ZrO

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10.13801/j.cnki.fhclxb.20140620.001

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abstract = "Mechanical properties and toughening mechanisms of three ceramics, 99.5vol% Al2O3 (AD995) ceramic, ZrO2(15vol%)/Al2O3 ceramic and ZrO2(25vol%)/Al2O3 ceramic prepared by hot pressing sintering were investigated by experimental and theoretical research. Based on the micro-mechanics theory of composites, a micromechanical constitution model was developed to describe mechanical properties of ZrO2/Al2O3 considering phase transformation of ZrO2. The results show that the grain size of Al2O3 matrix decreases and densification is improved with addition of ZrO2. The failure of three ceramic specimens show characteristic of small deformation to brittle failure. The compression stress-strain curves show an approximately linear relationship. The fracture toughness of AD995 ceramic is 5.65 MPa·m1/2, while ZrO2(25vol%)/Al2O3 is 8.42 MPa·m1/2, approximately 50% improvement.With toughening phase ZrO2 content increasing, elastic modulus of ZrO2/Al2O3 decreases and fracture toughness increases, which are consistent with experimental results.",

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AU - Long, Bo

AU - Ning, Jianguo

AU - Chu, Liang

PY - 2015/6/1

Y1 - 2015/6/1

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AB - Mechanical properties and toughening mechanisms of three ceramics, 99.5vol% Al2O3 (AD995) ceramic, ZrO2(15vol%)/Al2O3 ceramic and ZrO2(25vol%)/Al2O3 ceramic prepared by hot pressing sintering were investigated by experimental and theoretical research. Based on the micro-mechanics theory of composites, a micromechanical constitution model was developed to describe mechanical properties of ZrO2/Al2O3 considering phase transformation of ZrO2. The results show that the grain size of Al2O3 matrix decreases and densification is improved with addition of ZrO2. The failure of three ceramic specimens show characteristic of small deformation to brittle failure. The compression stress-strain curves show an approximately linear relationship. The fracture toughness of AD995 ceramic is 5.65 MPa·m1/2, while ZrO2(25vol%)/Al2O3 is 8.42 MPa·m1/2, approximately 50% improvement.With toughening phase ZrO2 content increasing, elastic modulus of ZrO2/Al2O3 decreases and fracture toughness increases, which are consistent with experimental results.

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KW - Toughening mechanisms

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Mechanical properties and toughening mechanisms of ZrO₂ toughened Al₂O₃ ceramics

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Keywords

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