PVD Hard Coatings for High Loaded Al Alloys – Potentials and Limitations

Anja Buchwalder; Erik Zaulig; Rolf Zenker; Jürgen Liebich

doi:10.4028/www.scientific.net/MSF.828-829.334

Paper Titles

Residual Stress in SLM Ti6Al4V Alloy Specimens
p.305

Twinning Assisted Crack Propagation of Magnesium-Rare Earth Casting and Wrought Alloys under Bending
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Development of Biodegradable Coating for Controlled Dissolution of a Magnesium Alloy as an Implant
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Pre-Treatment and Organic Coating of Al Free Mg Alloy for Controlling Degradation Rates
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PVD Hard Coatings for High Loaded Al Alloys – Potentials and Limitations
p.334

Surface Microstructure Modification by Wire-Brushing and Annealing and its Effect on Tensile Ductility and Bendability of Mg Sheet
p.340

Tribocorrosion Response of Laser Clad TiNiZrO₂ Composite Coatings on Ti6Al4V
p.345

Bio-Mechanical Compatibility Assessment of Titanium-Nickel Alloy Fabricated Using Cold Spray Process
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A Novel Process for Fabricating Aluminium Alloy Porous Structure for Possible Application in Antimicrobial Filtration
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HomeMaterials Science ForumMaterials Science Forum Vols. 828-829PVD Hard Coatings for High Loaded Al Alloys –...

PVD Hard Coatings for High Loaded Al Alloys – Potentials and Limitations

Abstract:

PVD hard coating is a well-known surface treatment technology for steels to improve wear resistance and, to some extent, corrosion resistance. In principle, hard coating can be carried out for Al alloys, but due to the natural oxide layer and the insufficient load-bearing capacity of the soft base material, the application of this technology for wear protection of components is not regarded as being particularly promising. The research activities described in this paper focused on electron beam (EB) surface alloying with a Co-based additive, and the influence of two different hardness levels (270HV0.1 and 390HV0.1) on the improvement of the local load-bearing capacity of Al alloys with thin PVD hard coatings. A further focus of this research was on the material-specific aspects of the coating deposition. Compared to steels, the hard coated surface of Al alloys is rougher and the measured adhesion of the coating is significantly lower. For this purpose, different technological PVD parameters (e.g. Ti interlayer, deposition temperature, and time) were adapted to optimize the coating properties – especially adhesion. The paper deals with comparative studies of single (PVD hard coating of Al base material) and duplex treatment (EB alloying of Al base material and subsequent PVD hard coating) by means of improvement of the coating and compound hardness, friction and wear behavior (pin-on-disc test), as well as the corrosion resistance (potentiodynamic measurements in 0.05M H₂SO₄). While the level of improvement in wear resistance as a result of the duplex treatments strongly depended on the adhesion of the thin coatings, the corrosion behavior was strongly influenced by the PVD deposition process and coating thickness.

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Materials Science Forum (Volumes 828-829)

Pages:

334-339

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https://doi.org/10.4028/www.scientific.net/MSF.828-829.334

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Online since:

August 2015

Authors:

Anja Buchwalder*, Erik Zaulig, Rolf Zenker, Jürgen Liebich

Keywords:

Al Alloy, Corrosion, Electron Beam Alloying, PVD, Wear

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