Biaxial Strength of a ZrO2/(Ni+Al2O3) Nanocomposite |
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| Authors: | Wei-Hsing Tuan Shi-Ming Liu Chan-Ju Ho Tsong-Jen Yang |
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| Affiliation: | Department of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan; Department of Materials Science, Fa-Chia University, Taichung, Taiwan |
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| Abstract: | Previous studies demonstrated that the strength of zirconia (ZrO2) could be enhanced or reduced by respectively adding micrometer-sized alumina (Al2O3) or nickel (Ni) particles. In the present study, 5 vol% micrometer-sized Al2O3 particles and 1 vol% nanometer-sized Ni particles are incorporated into the ZrO2 matrix, which is subsequently densified by pressureless sintering. The biaxial strength of the ZrO2/(Ni+Al2O3) nanocomposite is nearly double that of the monolithic ZrO2. The increase in strength correlated with a reduction in the critical flaw size and not with any change in toughness, which may be a result of grain boundary strengthening. |
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