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Microstructure and mechanical properties of 8YSZ ceramics by liquid-phase sintering with CuO-TiO2 addition

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Abstract

The 8% (mass fraction) yttrium-partially-stabilized zirconia (8YSZ) ceramic was fabricated via liquid phase sintering at 1 200–1 400 °C by adding different mass ratios of CuO-16.7%TiO2 (molar fraction) as sintering aid. Relative density, microstructure, Vickers hardness and bending strength as a function of sintering temperature and additive content were investigated. The experiment results show that liquid phase sintering at low temperature can be realized through adding CuO-16.7% TiO2 to 8YSZ. The Vickers hardness and bending strength of samples with sintering aid are generally much higher than those of samples without sintering aid for all sintering temperatures, and increase with the increase of sintering temperature. When the addition content of CuO-16.7% TiO2 is beyond 0.5%, the relative density, Vickers hardness and bending strength decrease with the increase of the mass ratio of sintering aid. Low additions of sintering aid are beneficial to aiding densification; high additions of sintering aid are detrimental to the sintered properties mainly due to greater amounts of pores generated by the volatilization of oxygen with the eutectic reaction between copper oxide and titanium dioxide. It is found that the fine grain size and high relative density are two main reasons of the high bending strength and Vickers hardness of the materials.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University, Changsha, 410083, China

    Hong-ming Zhou  (周宏明), Yan-jun Guo  (郭雁军), Jian Li  (李荐), Dan-qing Yi  (易丹青) & Lai-rong Xiao  (肖来荣)

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  1. Hong-ming Zhou  (周宏明)
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  2. Yan-jun Guo  (郭雁军)
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  3. Jian Li  (李荐)
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  4. Dan-qing Yi  (易丹青)
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  5. Lai-rong Xiao  (肖来荣)
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Corresponding author

Correspondence to Hong-ming Zhou  (周宏明).

Additional information

Foundation item: Project(200805331062) supported by the Research Fund for the Doctoral Program of Higher Education of China; Project(2010FJ4061) supported by the Science and Technology Program of Hunan Province, China

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Zhou, Hm., Guo, Yj., Li, J. et al. Microstructure and mechanical properties of 8YSZ ceramics by liquid-phase sintering with CuO-TiO2 addition. J. Cent. South Univ. Technol. 19, 1196–1201 (2012). https://doi.org/10.1007/s11771-012-1128-9

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  • DOI: https://doi.org/10.1007/s11771-012-1128-9

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