Preparation of spheroidized and nano-structural spinels by the SPPS method

0487167 - ÚFP 2018 RIV CZ eng C - Conference Paper (international conference)
Brožek, Vlastimil - Lukáč, František - Medřický, Jan - Mušálek, Radek - Mašláni, Alan - Mastný, L. - Brodil, R.
Preparation of spheroidized and nano-structural spinels by the SPPS method.
Proceedings of 5th International Conference on Chemical Technology. Prague: Czech Society of Industrial Chemistry, 2017 - (Veselý, M.; Hrdlička, Z.; Hanika, J.; Lubojacký, J.), s. 261-266. ICCT. ISBN 978-80-86238-65-4. ISSN 2336-811X. E-ISSN 2336-8128.
[International Conference on Chemical Technology, ICCT 2017/5./. Mikulov (CZ), 10.04.2017-12.04.2017]
R&D Projects: GA ČR GA15-12145S
Institutional support: RVO:61389021
Keywords : Solution plasma spraying * suspension plasma spraying * spinels * ferrites * ruby * nanoparticles
OECD category: Inorganic and nuclear chemistry
www.icct.cz

Solution Precursor Plasma Spraying (SPPS) method, using hybrid water-stabilised plasma torch (WSP®-H), is presented in this study. Precursor, in a form of a solution of inorganic salts, is injected into the plasma jet, where the temperature can reach up to 25 000 K and a series of reactions lead to the formation of spherical sub-micrometric sized particles. The complete process of evaporating the liquid, crystallization, thermic decomposition, melting and recrystallization takes place in few milliseconds before the particles solidify. Melted nanoparticles can be either directly collected in order to obtain ultrafine powders or deposited onto a substrate to form micro-splats and continuous polycrystalline, and often partially amorphous, coatings. The possibility of continuous and discontinuous changes of stoichiometric composition in tetrahedral and octahedral configurations were analysed for the deposits of MgAl2O4, CoAl2O4 and CoFe2O4 spinels. Furthermore, thin colourful coatings of ruby and modified cobalt oxides were deposited onto ceramic and metallic substrates.
Permanent Link: http://hdl.handle.net/11104/0281864