Vorträge und Posterpräsentationen (mit Tagungsband-Eintrag):
F. Klimashin, H. Euchner, P.H. Mayrhofer:
"Nitrogen vacancies - a key factor in synthesis of Mo-Al-N hard coatings";
Vortrag: 43rd International Conference on Metallurgical Coatings and Thin Films (ICMCTF),
San Diego (USA);
25.04.2016
- 29.04.2016; in: "ICMCTF 2016",
(2016),
S. 25.
Kurzfassung englisch:
Here we show that cubic-structured Mo-Al-N coatings have a high potential to be used as wear-protection for various high-demanding applications. We have found that within this material system, nitrogen vacancies have a significant and determining role for the stabilization of the cubic structure - a necessary prerequisite for high thermal stability and strength. Whilst for solid solutions without N-vacancies the wurtzite-type structure is always energetically preferred, nitrogen vacancies favor the formation of the cubic phase. These ab initio predictions were experimentally verified with the help of magnetron sputtered Mo1-xAlxNy coatings. We could show for the first time, that the cubic phase can be maintained up to the very high Al-content of Al/(Mo+Al) ≈ 0.57. The significantly increased Al-content within the cubic phase for our sputtered Mo1-xAlxNy coatings suggests for an increased thermal stability and also helps to increase their hardness up to 38 GPa. (Further addition of Al results in a substantial softening to ~22 GPa as a consequence of the evolving wurtzite-type structure.)
Erstellt aus der Publikationsdatenbank der Technischen Universität Wien.