Boronized stainless steel with zirconia coatings

0456147 - ÚFP 2016 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Brožek, Vlastimil - Kolísko, J. - Kubatík, Tomáš František - Mastný, L. - Pokorný, P. - Tej, P.
Boronized stainless steel with zirconia coatings.
METAL 2015: 24th International Conference on Metallurgy and Materials, Conference Proceedings. Ostrava: TANGER Ltd, 2015, s. 1069-1074. ISBN 978-80-87294-62-8.
[METAL 2015. International Conference on Metallurgy and Materials /24./. Brno (CZ), 03.06.2015-05.06.2015]
Institucionální podpora: RVO:61389021
Klíčová slova: Boronised steel * plasma spraying * ceramic coatings * bond strength * zirkonia coatings
Kód oboru RIV: JH - Keramika, žáruvzdorné materiály a skla

Conditions of boronizing are described using a reactive diffusion method of boron from boron carbide and lanthanum hexaboride so that the formation of Fe2B is preferred to FeB which is more brittle and whose structure does not satisfy the conditions for perfect adhesion of modified zirconia ceramics. Perfectly rigid adhesive connection of needle-like embedded interlayers Fe2B in steel AISI 303 prepared by reactive diffusion of a boronizing medium without activators at 1000 ° C and exposure of 2-4 hours has the value of 20 - 24 MPa at the Pinn-off test.Ceramic coatings from Al2O3-ZrO2 ceramics formed on those interlayers have the value of bond strength up to 14 - 20 MPa.Thermal cycling between 100°C - 600 °C confirmed good adhesion of coatings with the underlying steel.During thermal cycling at elevated temperatures (600-1000 °C) there occurs a statistically significant number of faults in cohesion and mechanical destruction of the coatings. One of the reasons are secondary changes
Trvalý link: http://hdl.handle.net/11104/0256741