Development of suspension plasma sprayed alumina coatings with high enthalpy plasma torch

0476110 - ÚFP 2018 RIV CH eng J - Článek v odborném periodiku
Tesař, Tomáš - Mušálek, Radek - Medřický, Jan - Kotlan, Jiří - Lukáč, František - Pala, Zdeněk - Ctibor, Pavel - Chráska, Tomáš - Houdková, Š. - Rimal, V. - Curry, N.
Development of suspension plasma sprayed alumina coatings with high enthalpy plasma torch.
Surface and Coatings Technology. Roč. 325, September (2017), s. 277-288. ISSN 0257-8972
Grant CEP: GA ČR GA15-12145S
Institucionální podpora: RVO:61389021
Klíčová slova: Suspension plasma spraying * Aluminium oxide * Mechanical properties * Hardness * Adhesion * Wear resistance
Obor OECD: Coating and films
Impakt faktor: 2.906, rok: 2017
http://www.sciencedirect.com/science/article/pii/S0257897217306424

Deposition of aluminium oxide (Al2O3) coatings from liquid feedstocks using a high enthalpy hybrid water-stabilized plasma torch was investigated. The entire process included the optimization of spraying parameters using a commercial ready-to-spray suspension, optimization and deposition of custom-made suspensions and one solution and evaluation of mechanical properties of the most durable coatings. Acquired coating microstructures
varied from porous with typical columnar morphology to well-sintered dense structures with low porosity.
The microstructural features were clearly linked to the feedstock formulation. The most durable coating with the highest density microstructure prepared from ethanol-based suspension showed outstanding mechanical properties, e.g. high values of hardness (up to 1211 HV0.3), tensile adhesion strength (up to 51 MPa) and wear resistance (material removal rate as low as 1.94·10-5 mm3·N-1·m-1 as measured by pin-on-disc test). Moreover, deposition froma water-based solution of aluminiumnitrate resulted in deposition of highly porous coating composed predominantly of stable .alpha.-alumina phase.
Trvalý link: http://hdl.handle.net/11104/0272653