Positive modification on the mechanical, tribological and oxidation properties of AlCrNbSiN coatings by regulating the Nb/Si-doping ratio. Issue 22 (15th November 2021)

• Record Type: Journal Article
• Authors: Zhang, Huadong; Lin, Xiaoliang; Yu, Yang; Mei, Fangsheng; Zou, Liang; Gao, Jiangxiong
• Is Part Of: Ceramics international. Volume 47:Issue 22(2021)
• Page Start: 31603
• Page End: 31616
• Publication Date: 2021-11-15
• Subjects: AlCrNbSiN coatings -- Nb/Si-doping ratio -- Mechanical properties -- Tribological behavior -- Oxidation resistance; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.08.041
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The precise control of Nb/Si-doping ratio is the critical factor to tailor AlCrNbSiN coatings with superior comprehensive properties. In this study, the effect of Nb/Si-doping ratio on the microstructure, mechanical, tribological and oxidation properties of AlCrNbSiN coatings was systematically researched. With the increase of Nb/Si-doping ratio, coatings' microstructures changed from a featureless dense structure to a columnar and equiaxed mixed microstructure gradually. The main phase was transformed from the solid solution phase of h-Al( Cr )N for Nb-free coating (Nb/Si = 0:1) to c-Al( Cr )N solid solution for three Nb-containing coatings (Nb/Si = 1:2, 1:1 and 2:1). When Nb/Si ratio is 1:1, the formation of harmful h-NbN phase was found in the coating. The performance results indicated that, (1) The AlCrNbSiN coating with the Nb/Si ratio of 2:1 achieved optimal hardness (~34.9 GPa), toughness ( CPR s ~569.3) and the minimum wear rate of 2.34 × 10 −6 mm 3 /(N·m); (2) When the Nb/Si-doping ratio is 1:2, the coating exhibited the best oxidation resistance, attributing to the sufficient (Al, Si)Ox oxidation protective layer and only a small amount of AlNbO4 and CrNbO4 formed at 1200 °C.