Addition of Ta and Y in a hard Ti-Al-N PVD coating: Individual and conjugated effect on the oxidation and wear properties. (1st August 2019)

• Record Type: Journal Article
• Authors: Aninat, R.; Valle, N.; Chemin, J-B.; Duday, D.; Michotte, C.; Penoy, M.; Bourgeois, L.; Choquet, P.
• Is Part Of: Corrosion science. Volume 156(2019)
• Page Start: 171
• Page End: 180
• Publication Date: 2019-08-01
• Subjects: A. Ceramic -- A. Sputtered films -- B. SIMS -- B. SEM -- C. High temperature corrosion -- C. Oxidation; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2019.04.042
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Ta introduction strongly decreases the 850 °C oxidation rate in TiAlN and TiAlYN. Y introduction increases the room temperature hardness significantly in TiAlN and TiAlTaN. Thicker oxide layer causes less wear in running-up stage of ball-on-disk wear test. Abstract: A comparative study of as-deposited structural properties, oxidation and wear properties of industrially arc-deposited Ti-Al-N, Ti-Al-Y-N, Ti-Al-Ta-N and Ti-Al-Ta-Y-N is presented. In the as-deposited coatings, Ta leads to more compressive stress while Y reduces the compressive stress but increases the nanohardness. The nanohardness of Ti-Al-Ta-Y-N is shown to be dominated by Y while its oxidation rate is dominated by Ta. Interestingly, Ta specifically favours the growth of oxide at the interface between Al-rich and Ti-rich oxide layers.In 850°C ball-on-disk wear tests, there is a pronounced effect of the running-in stage, which in turn depends strongly on the oxidation properties of the coating.The transferability of these findings to industrial machining at higher temperatures are discussed.