High-temperature thermal stability and oxidation resistance of Cr and Ta co-alloyed Ti − Al − N coatings deposited by cathodic arc evaporation

•The high-temperature properties of Cr and Ta co-alloyed Ti−Al−N coatings were studied.•Ti−Al−Cr−Ta−N coatings show spinodal decomposition and age-hardening upon annealing.•Ta-addition delays the formation of wurtzite AlN by 100 − 200 °C upon annealing.•Co-alloying with Cr and Ta leads to the optima...

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Bibliographic Details
Published in:Corrosion science 2020-05, Vol.167, p.108490, Article 108490
Main Authors: Peng, Bin, Li, Haiqing, Zhang, Quan, Xu, Yu X., Wei, Tiefeng, Wang, Qimin, Zhang, Fengge, Kim, Kwang Ho
Format: Article
Language:English
Subjects:
A. Ceramic
Age hardening
Alloying
Annealing
Arc deposition
B. TEM
B. XRD
C. Hardening
C. Oxidation
Cathodic coating (process)
Coatings
High temperature
Inert atmospheres
Oxidation
Oxidation resistance
Spinodal decomposition
Thermal resistance
Thermal stability
Titanium
Wurtzite
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Summary:•The high-temperature properties of Cr and Ta co-alloyed Ti−Al−N coatings were studied.•Ti−Al−Cr−Ta−N coatings show spinodal decomposition and age-hardening upon annealing.•Ta-addition delays the formation of wurtzite AlN by 100 − 200 °C upon annealing.•Co-alloying with Cr and Ta leads to the optimal oxidation resistance of Ti−Al−Cr−Ta−N coatings.•Dense outer scale promoted by Cr and inner Ta-containing TiO2 inhibits oxygen transport. Cr and Ta co-alloyed Ti−Al−N coatings were synthesised by cathodic arc deposition. The high-temperature stability and oxidation behaviour of the coatings were investigated by annealing in an inert atmosphere and oxidation environment, respectively. The results indicated that FCC-structured (Ti, Al, Cr, Ta)N coatings exhibit spinodal decomposition and age-hardening upon annealing. Ta retarded the formation of wurtzite AlN and helped to maintain high coating hardness at 900–1000 °C. Cr promoted the formation of protective (Al, Cr)2O3 scale and (Ti, Ta)O2 rutile oxide was found beneath, which reduced mass transport of oxygen during oxidation. Co-alloying with Cr and Ta leads to optimal oxidation resistance of (Ti, Al, Cr, Ta)N coatings.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2020.108490