Mechanical properties and microstructure for 3 mol% yttria doped zirconia/silicon carbide nanocomposites

Noriko Bamba; Yong Ho Choa; Tohru Sekino; Koichi Niihara

doi:10.1016/S0955-2219(02)00168-1

Mechanical properties and microstructure for 3 mol% yttria doped zirconia/silicon carbide nanocomposites

Noriko Bamba, Yong Ho Choa, Tohru Sekino, Koichi Niihara

Institute of Multidisciplinary Research for Advanced Materials (IMRAM)

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

34 Citations (Scopus)

Abstract

3 Mol% yttria stabilized tetragonal zirconia polycrystalline (3Y-TZP) is well known as a transformation toughening material with excellent mechanical properties at ambient temperature. However, the properties of 3Y-TZP drop down with increasing temperature. In this study, nanocomposite techniques were applied in order to improve mechanical properties of 3Y-TZP. 3Y-TZP/SiC nanocomposites were fabricated by hot-pressing, and effects of SiC particles on microstructure, transformation from tetragonal zirconia (t-ZrO₂) to monoclinic ZrO₂ (m-ZrO₂) and its mechanical properties were investigated. Fracture toughness of the nanocomposite was improved without decrease of strength. This should be due to not only crack deflection by dispersed SiC particles with high Young's modulus, but also the phase transformation of t-ZrO₂ accelerated by the residual stresses from coeffecient of thermal expansion mismatch between 3Y-TZP and SiC.

Original language	English
Pages (from-to)	773-780
Number of pages	8
Journal	Journal of the European Ceramic Society
Volume	23
Issue number	5
DOIs	https://doi.org/10.1016/S0955-2219(02)00168-1
Publication status	Published - 2003 Apr 1

Keywords

Mechanical properties
Nanocomposites
SiC inclusions
Toughness
ZrO

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

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title = "Mechanical properties and microstructure for 3 mol% yttria doped zirconia/silicon carbide nanocomposites",

abstract = "3 Mol% yttria stabilized tetragonal zirconia polycrystalline (3Y-TZP) is well known as a transformation toughening material with excellent mechanical properties at ambient temperature. However, the properties of 3Y-TZP drop down with increasing temperature. In this study, nanocomposite techniques were applied in order to improve mechanical properties of 3Y-TZP. 3Y-TZP/SiC nanocomposites were fabricated by hot-pressing, and effects of SiC particles on microstructure, transformation from tetragonal zirconia (t-ZrO2) to monoclinic ZrO2 (m-ZrO2) and its mechanical properties were investigated. Fracture toughness of the nanocomposite was improved without decrease of strength. This should be due to not only crack deflection by dispersed SiC particles with high Young's modulus, but also the phase transformation of t-ZrO2 accelerated by the residual stresses from coeffecient of thermal expansion mismatch between 3Y-TZP and SiC.",

keywords = "Mechanical properties, Nanocomposites, SiC inclusions, Toughness, ZrO",

author = "Noriko Bamba and Choa, {Yong Ho} and Tohru Sekino and Koichi Niihara",

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AU - Bamba, Noriko

AU - Choa, Yong Ho

AU - Sekino, Tohru

AU - Niihara, Koichi

PY - 2003/4/1

Y1 - 2003/4/1

N2 - 3 Mol% yttria stabilized tetragonal zirconia polycrystalline (3Y-TZP) is well known as a transformation toughening material with excellent mechanical properties at ambient temperature. However, the properties of 3Y-TZP drop down with increasing temperature. In this study, nanocomposite techniques were applied in order to improve mechanical properties of 3Y-TZP. 3Y-TZP/SiC nanocomposites were fabricated by hot-pressing, and effects of SiC particles on microstructure, transformation from tetragonal zirconia (t-ZrO2) to monoclinic ZrO2 (m-ZrO2) and its mechanical properties were investigated. Fracture toughness of the nanocomposite was improved without decrease of strength. This should be due to not only crack deflection by dispersed SiC particles with high Young's modulus, but also the phase transformation of t-ZrO2 accelerated by the residual stresses from coeffecient of thermal expansion mismatch between 3Y-TZP and SiC.

AB - 3 Mol% yttria stabilized tetragonal zirconia polycrystalline (3Y-TZP) is well known as a transformation toughening material with excellent mechanical properties at ambient temperature. However, the properties of 3Y-TZP drop down with increasing temperature. In this study, nanocomposite techniques were applied in order to improve mechanical properties of 3Y-TZP. 3Y-TZP/SiC nanocomposites were fabricated by hot-pressing, and effects of SiC particles on microstructure, transformation from tetragonal zirconia (t-ZrO2) to monoclinic ZrO2 (m-ZrO2) and its mechanical properties were investigated. Fracture toughness of the nanocomposite was improved without decrease of strength. This should be due to not only crack deflection by dispersed SiC particles with high Young's modulus, but also the phase transformation of t-ZrO2 accelerated by the residual stresses from coeffecient of thermal expansion mismatch between 3Y-TZP and SiC.

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