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Solid state crystallization of alumina-zirconia-silica nanocomposites
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SYSNO ASEP 0336717 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Solid state crystallization of alumina-zirconia-silica nanocomposites Title Krystalizace Al2O3-ZrO2-SiO2 nanokompozitu v tuhém stavu Author(s) Chráska, Tomáš (UFP-V) RID, ORCID
Hostomský, Jiří (UACH-T)
Klementová, Mariana (UACH-T) RID, SAI, ORCID
Kolman, Blahoslav Jan (UFP-V)Source Title Proceedings of the 11th European Ceramics Society Conference. - Cracow : European Ceramic Society and Polish Ceramic Society, 2010 / Pędzich Z. - ISBN 978-83-60958-54-4 Pages s. 609-614 Number of pages 7 s. Publication form CD ROM - CD ROM Action Conference and Exhibition of the European Ceramics Society/11th./ Event date 21.06.2009-25.06.2009 VEvent location Krakow Country PL - Poland Event type EUR Language eng - English Country PL - Poland Keywords nanocrystalline ceramics ; plasma spraying ; heat treatment Subject RIV JH - Ceramics, Fire-Resistant Materials and Glass R&D Projects KAN300430651 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z20430508 - UFP-V (2005-2011) AV0Z40320502 - UACH-T (2005-2011) Annotation Several amorphous materials were produced by plasma spraying of near-eutectic mixtures from the system Al2O3–ZrO2–SiO2. Phase composition and microstructure of the amorphous materials as well as the nanocrystalline products were analyzed. All of the amorphous materials show an exothermic peak between 940 and 990 ºC in DSC experiments. The activation energies calculated from DSC traces decrease with increasing SiO2 concentration. Values of the Avrami coefficients together with results of the microstructural observations indicate that tetragonal zirconia crystallization from materials containing more than 10 wt.% of SiO2 proceeds by a diffusion-controlled mechanism. Significant increase of microhardness values in the heat treated samples can be attributed to the fine nanocomposite structure. The samples also exhibit significant improvement of the abrasion resistance making the nanocrystalline materials suitable for many applications. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2010
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