RT Journal Article
T1 Investigation of particle flattening behaviour and bonding mechanisms of APS sprayed coatings on magnesium alloys
A1 Parco, Maria
A1 Zhao, Lidong
A1 Zwick, Jochen
A1 Bobzin, Kirsten
A1 Lugscheider, Erich
AB Magnesium alloys are promising alternatives to other lightweight materials due to their high specific strength and stiffness. However, the use of magnesium alloys is limited by their poor wear behaviour and low corrosion resistance for many industrial applications. The thermal spray technology offers a wide range of possibilities to improve the surface properties of Mg-based components. In this study, three different coating materials, namely Al, NiAl5 and Al2O3, were applied on AZ91 and AE42 substrates using the atmospheric plasma spray technology. The investigation was focused on the bonding strength of the coatings and the related bonding mechanisms. For a better understanding of the bonding mechanisms, the flattening behaviour of the spray particles was investigated in correlation with the substrate pre-heating temperature. It was found that NiAl5-particles could well melt the substrate at the surface and deformed it locally; Al-particles did the same but to a lower extent. The dominating bonding mechanism for NiAl5-coatings could be attributed to a metallurgical bonding. For Al-coatings, this mechanism played a more important role once the substrate pre-heating temperature was increased. Al2O3 particles in contrast, were less able to deform the substrate in spite of their higher thermal load and the mechanical anchoring remained the main bonding mechanism. The thermo physical properties of the Mg substrate showed also to have an influence on the adhesion of the coatings.
SN 0257-8972
YR 2007
FD 2007-02-04
LK https://hdl.handle.net/11556/3065
UL https://hdl.handle.net/11556/3065
LA eng
NO Parco , M , Zhao , L , Zwick , J , Bobzin , K & Lugscheider , E 2007 , ' Investigation of particle flattening behaviour and bonding mechanisms of APS sprayed coatings on magnesium alloys ' , Surface and Coatings Technology , vol. 201 , no. 14 , pp. 6290-6296 . https://doi.org/10.1016/j.surfcoat.2006.11.034
NO The investigations were promoted from the funds of the German Federal Ministry of Economic Affairs and Employment via the Federation of Industrial Research Associations (AiF No. 13.769 N) and were supported by the Research Association for Welding and Allied Processes of the DVS. We would like to record our appreciation of this promotion and support.
DS TECNALIA Publications
RD 30 jul 2024