The Formation of Composite Ti-Al-N Coatings Using Filtered Vacuum Arc Deposition with Separate Cathodes

Ti-Al-N coatings were deposited on high-speed steel substrates by filtered vacuum arc deposition (FVAD) during evaporation of aluminum and titanium cathodes. Distribution of elements, phase composition, and mechanical properties of Ti-Al-N coatings were investigated using Auger electron spectroscopy...

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Bibliographic Details
Published in:Metals (Basel ) 2017-11, Vol.7 (11), p.497
Main Authors: Shulepov, Ivan, Kashkarov, Egor, Stepanov, Igor, Syrtanov, Maxim, Sutygina, Alina, Shanenkov, Ivan, Obrosov, Aleksei, Weiß, Sabine
Format: Article
Language:English
Subjects:
Adhesion tests
Aluminum
Arc deposition
Cathodes
Cathodic coating (process)
Coatings
Crystallites
deposition
filtered vacuum arc
hardness
High speed tool steels
Intermetallic compounds
Mechanical properties
Microhardness
Microstructure
Nanoindentation
Phase composition
Precipitates
Preferred orientation
Scratch tests
separate cathodes
Substrates
TiAlN
Titanium
Transmission electron microscopy
Tribology
wear-resistance
X-ray diffraction
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Summary:Ti-Al-N coatings were deposited on high-speed steel substrates by filtered vacuum arc deposition (FVAD) during evaporation of aluminum and titanium cathodes. Distribution of elements, phase composition, and mechanical properties of Ti-Al-N coatings were investigated using Auger electron spectroscopy (AES), X-ray diffraction (XRD), transmission electron microscopy (TEM) and nanoindentation, respectively. Additionally, tribological tests and scratch tests of the coatings were performed. The stoichiometry of the coating changes from Ti0.6Al0.4N to Ti0.48Al0.52N with increasing aluminum arc current from 70 A to 90 A, respectively. XRD and TEM showed only face-centered cubic Ti-Al-N phase with preferred orientation of the crystallites in (220) direction with respect to the sample normal and without precipitates of AlN or intermetallics inside the coatings. Incorporation of Al into the TiN lattice caused shifting of the (220) reflex to a higher 2θ angle with increasing Al content. Low content and size of microdroplets were obtained using coaxial plasma filters, which provides good mechanical and tribological properties of the coatings. The highest value of microhardness (36 GPa) and the best wear-resistance were achieved for the coating with higher Al content, thus for Ti0.48Al0.52N. These coatings exhibit good adhesive properties up to 30 N load in the scratch tests.
ISSN:2075-4701
2075-4701
DOI:10.3390/met7110497