Microstructure and mechanical properties of ZrO2 (Y2O3)–Al2O3 nanocomposites prepared by spark plasma sintering--颗粒学报PARTICUOLOGY

Li, S., Izui, H., Okano, M., Zhang, W., & Watanabe, T. (2012). Microstructure and mechanical properties of ZrO2 (Y2O3)–Al2O3 nanocomposites prepared by spark plasma sintering. Particuology, 10(3), 345–351. https://doi.org/10.1016/j.partic.2011.05.002

Microstructure and mechanical properties of ZrO₂ (Y₂O₃)–Al₂O₃nanocomposites prepared by spark plasma sintering

Shufeng Li ^{a c *}, Hiroshi Izui ^a, Michiharu Okano ^b, Weihua Zhang ^c, Taku Watanabe ^a

a College of Science and Technology, Nihon University, 7-24-1, Narashinodai, Funabashi, Chiba 274-8501, Japan
b College of Science and Technology, Nihon University, 1-8-14, Kandasurugadai, Chiyoda, Tokyo 101-8308, Japan
c College of Materials Science and Technology, Xi’an University of Technology, 5 South Jinhua Road, Xi’an, Shaanxi 710048, China

10.1016/j.partic.2011.05.002

Volume 10, Issue 3, June 2012, Pages 345-351

Received 10 February 2011, Revised 20 April 2011, Accepted 4 May 2011, Available online 8 November 2011.

E-mail: shufengli@hotmail.com

Highlights

Abstract

Zirconia (yttria)–alumina ceramic nanocomposites were fabricated from different powders by spark plasma sintering (SPS). One powder was a commercially available nanocomposite powder TZP-3Y20A, consisting of 3 mol% yttria-stabilized zirconia (3-YSZ) reinforced with 20 wt% alumina, and the other, used as a comparison, was a conventional mechanically mixed powder 3YSZ-20A, a blend made of 3 mol% yttria-stabilized zirconia powder ZrO₂ (3Y) and 20 wt% α-alumina powder. The effect of the sintering temperature on the densification, the sintering behavior, the mechanical properties and the microstructure of the composites was investigated. The results showed that the density increased with increasing sintering temperature, and thus, the mechanical properties were strengthened because of the increased densification. The nanocomposite powder TZP-3Y20A was easily sintered, and good mechanical properties were achieved as compared with the powder from the conventional mechanically mixed method, the maximum flexural strength and fracture toughness of which were 967 MPa and 5.27 MPa m^1/2, respectively.

Graphical abstract

Keywords

Zirconia–alumina; Nanocomposite; Spark plasma sintering (SPS); Mechanical properties; Microhardness; Fracture toughness; Densification

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