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Structural features and tribo-mechanical properties of TiAlBSiN nanocomposite coatings

Oleksandr Pshyk

Abstract

This thesis explores structural features and physical properties of the TiAlSiBN-based coatings with the amorphous structure and gradient nanocomposite microstructure. The gradient TiAlBSiN coating is deposited by means of reactive/non-reactive magnetron sputtering of the composite target AlN–TiB2 –TiSi2. The study reveals that the gradient coating is composed of two layers with the different microstructure and elemental composition. Both layers are based on the crystalline fcc-(Ti, Al)(N,O,B) and hcp-(Al, Ti) (N,O) phases which are encapsulated in a mixed amorphous phase. The top layer of about 220 nm in thickness was composed of fine crystallites with dimensions in the range of 15-40 nm. The bottom layer was formed by non-uniformly distributed nanocrystals of about 5-40 nm. The study of the mechanical and tribological properties reveals the promising elastic properties and relatively high wear resistance of the gradient coating. The amorphous TiAlBSiN coating is deposited by means of non-reactive magnetron sputtering of the composite target AlN–TiB2 –TiSi2 . The studied Al-rich amorphous TiAlBSiN coating showed relatively better thermal stability in oxidative environment in comparison to the TiAlBSiN-based coatings reported in the literature previously. The micro-scale tribological measurements of TiAlBSiN amorphous coating showed very promising tribological characteristics.
Record ID
UAM3db94b73774046c080a1e8b70d8def17
Diploma type
Doctor of Philosophy
Author
Oleksandr Pshyk Oleksandr Pshyk,, Undefined Affiliation
Title in Polish
Cechy strukturalne i właściwości trybo-mechaniczne powłok nanokompozytowych TiAlBSiN
Title in English
Structural features and tribo-mechanical properties of TiAlBSiN nanocomposite coatings
Language
en English
Certifying Unit
Faculty of Physics (SNŚ/WyF/FoP)
Discipline
physics / (physical sciences domain) / (physical sciences)
Scientific discipline (2.0)
6.6 physical sciences
Defense Date
29-01-2018
End date
29-01-2018
Supervisor
URL
http://hdl.handle.net/10593/21355 opening in a new tab
Keywords in English
nanocomposite, mechanical properties, protective coatings, microstructure, amorphous coating
Abstract in English
This thesis explores structural features and physical properties of the TiAlSiBN-based coatings with the amorphous structure and gradient nanocomposite microstructure. The gradient TiAlBSiN coating is deposited by means of reactive/non-reactive magnetron sputtering of the composite target AlN–TiB2 –TiSi2. The study reveals that the gradient coating is composed of two layers with the different microstructure and elemental composition. Both layers are based on the crystalline fcc-(Ti, Al)(N,O,B) and hcp-(Al, Ti) (N,O) phases which are encapsulated in a mixed amorphous phase. The top layer of about 220 nm in thickness was composed of fine crystallites with dimensions in the range of 15-40 nm. The bottom layer was formed by non-uniformly distributed nanocrystals of about 5-40 nm. The study of the mechanical and tribological properties reveals the promising elastic properties and relatively high wear resistance of the gradient coating. The amorphous TiAlBSiN coating is deposited by means of non-reactive magnetron sputtering of the composite target AlN–TiB2 –TiSi2 . The studied Al-rich amorphous TiAlBSiN coating showed relatively better thermal stability in oxidative environment in comparison to the TiAlBSiN-based coatings reported in the literature previously. The micro-scale tribological measurements of TiAlBSiN amorphous coating showed very promising tribological characteristics.
Thesis file

Uniform Resource Identifier
https://researchportal.amu.edu.pl/info/phd/UAM3db94b73774046c080a1e8b70d8def17/

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