Microwave Sintering of Zirconia Materials: Mechanical and Microstructural Properties

Authors

  • Amparo Borrell,

    Corresponding author
    • Parque Tecnológico de Asturias, Centro de Investigación en Nanomateriales y Nanotecnología (CINN) (Consejo Superior de Investigaciones Científicas-Universidad de Oviedo-Principado de Asturias), Llanera (Asturias), Spain
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  • María D. Salvador,

    1. Instituto de Tecnología de Materiales (ITM), Universidad Politécnica de Valencia, Valencia, Spain
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  • Felipe L. Peñaranda-Foix,

    1. Instituto de Aplicaciones de las Tecnologías de la Información y de las Comunicaciones Avanzadas (ITACA), Universidad Politécnica de Valencia, Valencia, Spain
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  • Jose M. Cátala-Civera

    1. Instituto de Aplicaciones de las Tecnologías de la Información y de las Comunicaciones Avanzadas (ITACA), Universidad Politécnica de Valencia, Valencia, Spain
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a.borrell@cinn.es

Abstract

Commercially, 3 mol% Y2O3-stabilized tetragonal zirconia (70–90 nm) compacts were fabricated using a conventional and a nonconventional sintering technique; microwave heating in a resonant mono-mode cavity at 2.45 GHz, at temperatures in the 1100–1400°C range. A considerable difference in the densification behavior between conventional (CS) and microwave (MW) sintered materials was observed. The MW materials attain a full density of 99.9% of the theoretical density (t.d.) at 1400°C/10 min, whereas the CS reach only 98.0% t.d. at the same temperature and 1 h of dwelling time. Therefore, the MW materials exhibit superior Vickers hardness values (16.0 GPa) when compared with CS (13.4 GPa).

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