Influence of nickel addition on the microstructure and mechanical properties of Al2O3-5vol%ZrO2 ceramic composites prepared via precipitation method

Betül Kafkaslıoğlu Yıldız; Hüseyin Yılmaz; Yahya Kemal Tür

doi:10.1007/s12613-019-1792-y

Volume 26 Issue 7

Jul. 2019

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2019 > 26(7): 908-914

Betül Kafkaslıoğlu Yıldız, Hüseyin Yılmaz, and Yahya Kemal Tür, Influence of nickel addition on the microstructure and mechanical properties of Al₂O₃-5vol%ZrO₂ ceramic composites prepared via precipitation method, Int. J. Miner. Metall. Mater., 26(2019), No. 7, pp. 908-914. https://doi.org/10.1007/s12613-019-1792-y

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Betül Kafkaslıoğlu Yıldız, Hüseyin Yılmaz, and Yahya Kemal Tür, Influence of nickel addition on the microstructure and mechanical properties of Al2O3-5vol%ZrO2 ceramic composites prepared via precipitation method, Int. J. Miner. Metall. Mater., 26(2019), No. 7, pp. 908-914. https://doi.org/10.1007/s12613-019-1792-y

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Research Article

Influence of nickel addition on the microstructure and mechanical properties of Al₂O₃-5vol%ZrO₂ ceramic composites prepared via precipitation method

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Corresponding author:
Betül Kafkaslıoğlu Yıldız E-mail: bkafkaslioglu@gtu.edu.tr
Received: 19 July 2018; Revised: 18 October 2018; Accepted: 25 October 2018

Abstract

Abstract

The aim of this work was to investigate the microstructure and mechanical properties of 1vol%-Ni-added yttria-stabilized zirconia (YSZ) toughened alumina composites. First, Ni powders were heterogeneously precipitated in an alumina-zirconia powder mixture suspended in water; the prepared specimens were then pressureless sintered at 1550℃/2 h in a 90vol%Ar/10vol% H₂ atmosphere. The structure of phases and microstructure of the composites were characterized by X-ray diffraction and scanning electron microscopy, respectively. Mechanical characterization of the specimens was carried out through Vickers hardness, Vickers indentation toughness, and three-point flexural bending tests. The fine Ni particles were homogeneously dispersed throughout the alumina matrix because of the employed processing method. Furthermore, hardness and toughness values were found to increase by 8% and 50%, respectively, with Ni addition, whereas the relative densities and flexural strength values were found to remain unchanged.
- alumina;
- zirconia;
- ceramic matrix;
- microstructure;
- hardness;
- strength;
- toughness

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