Comparison of WSP and HVOF Sprayed Alumina Coatings Behavior during Mechanical Loading

0352072 - ÚFP 2011 RIV SK eng C - Conference Paper (international conference)
Pejchal, V. - Mušálek, R. - Matějíček, Jiří
Comparison of WSP and HVOF Sprayed Alumina Coatings Behavior during Mechanical Loading.
Vrstvy a povlaky 2010. Trenčín: LISS a.s, 2010 - (Šošovičková, J.), s. 69-74. ISBN 978-80-970514-2-6.
[Vrstvy a povlaky 2010. Rožnov pod Radhoštěm (CZ), 04.10.2010-05.10.2010]
R&D Projects: GA MŠMT ME 901
Institutional research plan: CEZ:AV0Z20430508
Keywords : thermal spray * WSP * HVOF * alumina * 4PB * SAR
Subject RIV: JK - Corrosion ; Surface Treatment of Materials

In this study, alumina coatings were deposited using water stabilized plasma (WSP) and high-velocity oxy-fuel (HVOF) process with two different spraying setups. Different deposition conditions resulted in different pores and cracks morphology and, for one HVOF setup, in creation of deliberately introduced vertical macro-cracks. Coated samples were subjected to four-point bending (4PB) test. Slurry abrasive response (SAR) test, corresponding to ASTM G75-01, was carried out to compare coatings wear resistance. The microstructure of the samples was observed in SEM on cross-section and free-surface before and after wear test. In addition, coating hardness was determined on the cross-sections. Relation between microstructure features and macroscopic mechanical properties of the coatings is discussed. Tests carried out for coatings with the same chemical composition but different microstructure proved strong dependency of coatings mechanical properties on voids morphology.
Permanent Link: http://hdl.handle.net/11104/0191667