Number of the records: 1
Improvement of Mechanical Properties of Plasma Sprayed Al2O3–ZrO2–SiO2 Amorphous Coatings by Surface Crystallization
- 1.
SYSNO ASEP 0517498 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Improvement of Mechanical Properties of Plasma Sprayed Al2O3–ZrO2–SiO2 Amorphous Coatings by Surface Crystallization Author(s) Medřický, Jan (UFP-V) RID
Lukáč, František (UFP-V) ORCID
Csáki, Štefan (UFP-V) ORCID
Houdková, Š. (CZ)
Barbosa, M. (DE)
Tesař, Tomáš (UFP-V) ORCID
Čížek, Jan (UFP-V) ORCID
Mušálek, Radek (UFP-V) RID, ORCID
Kovařík, O. (CZ)
Chráska, Tomáš (UFP-V) RID, ORCIDNumber of authors 10 Article number 3232 Source Title Materials. - : MDPI
Roč. 12, č. 19 (2019)Number of pages 17 s. Language eng - English Country CH - Switzerland Keywords Amorphous ; Nanocrystalline ; Plasma spraying ; Vickers microhardness ; Wear resistant OECD category Materials engineering R&D Projects FV30058 GA MPO - Ministry of Industry and Trade (MPO) Method of publishing Open access Institutional support UFP-V - RVO:61389021 UT WOS 000493308500181 EID SCOPUS 85073740251 DOI 10.3390/ma12193232 Annotation Ceramic Al2O3-ZrO2-SiO2 coatings with near eutectic composition were plasma sprayed using hybrid water stabilized plasma torch (WSP-H). The as-sprayed coatings possessed fully amorphous microstructure which can be transformed to nanocrystalline by further heat treatment. The amorphous/crystalline content ratio and the crystallite sizes can be controlled by a specific choice of heat treatment conditions, subsequently leading to significant changes in the microstructure and mechanical properties of the coatings, such as hardness or wear resistance. In this study, two advanced methods of surface heat treatment were realized by plasma jet or by high energy laser heating. As opposed to the traditional furnace treatments, inducing homogeneous changes throughout the material, both approaches lead to a formation of gradient microstructure within the coatings, from dominantly amorphous at the substrate-coating interface vicinity to fully nanocrystalline near its surface. The processes can also be applied for large-scale applications and do not induce detrimental changes to the underlying substrate materials. The respective mechanical response was evaluated by measuring coating hardness profile and wear resistance. For some of the heat treatment conditions, an increase in the coating microhardness by factor up to 1.8 was observed, as well as improvement of wear resistance behaviour up to 6.5 times. The phase composition changes were analysed by X-ray diffraction and the microstructure was investigated by scanning electron microscopy. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2020 Electronic address https://www.mdpi.com/1996-1944/12/19/3232
Number of the records: 1