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Post-treatment of Plasma-Sprayed Amorphous Ceramic Coatings by Spark Plasma Sintering

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Abstract

Alumina-zirconia ceramic material has been plasma sprayed using a water-stabilized plasma torch to produce free standing coatings. The as-sprayed coatings have very low porosity and are mostly amorphous. The amorphous material crystallizes at temperatures above 900 °C. A spark plasma sintering apparatus has been used to heat the as-sprayed samples to temperatures above 900 °C to induce crystallization, while at the same time, a uniaxial pressure of 80 MPa has been applied to their surface. After such post-treatment, the ceramic samples are crystalline and have very low open porosity. The post-treated material exhibits high hardness and significantly increased flexural strength. The post-treated samples have a microstructure that is best described as nanocomposite with the very small crystallites embedded in an amorphous matrix.

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Acknowledgment

Support by the Grant Agency of the Czech Republic under the Grant P107/12/1922 is acknowledged. Discussions and collaboration with P. Hausild as well as the availability of the Nano Indentation Tester at the Faculty of Nuclear Science and Physical Engineering of Czech Technical University are gratefully appreciated.

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Authors and Affiliations

  1. Institute of Plasma Physics ASCR, Prague, Czech Republic

    T. Chraska, Z. Pala, R. Mušálek, J. Medřický & M. Vilémová

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  1. T. Chraska
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  2. Z. Pala
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  3. R. Mušálek
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  4. J. Medřický
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  5. M. Vilémová
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Correspondence to T. Chraska.

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Chraska, T., Pala, Z., Mušálek, R. et al. Post-treatment of Plasma-Sprayed Amorphous Ceramic Coatings by Spark Plasma Sintering. J Therm Spray Tech 24, 637–643 (2015). https://doi.org/10.1007/s11666-015-0225-3

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  • DOI: https://doi.org/10.1007/s11666-015-0225-3

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