Mechanical and tribological properties of Cr–Nb?double-glow plasma coatings deposited on Ti–Al? alloy

Affiliation of Author(s):材料科学与技术学院

Journal:Tribol. Mater. Surf. Interfaces

Abstract:Double-glow plasma (DGP) coatings are recommended for metallic components to mitigate the damage induced by complex working conditions in previous studies. In this paper, Nb-rich (Cr–Nb4) and Cr-rich (Cr4–Nb) -alloyed layers were formed onto the Ti–Al substrate via a DGP process to enhance its wear resistance. Scratch and Nano-indentation tests were used to evaluate the mechanical properties of the coatings. The tribological behaviour of the coatings were investigated using a pin-on-disc tribometer by rubbing against the GCr15 ball. Results from surface analysis techniques showed that the coatings mainly comprised Cr, Nb and Cr2–Nb phases, and were well bonded to the substrate. The hardness of the Cr–Nb4coating was 11.61GPa and the Cr4–Nb coating was 9.66 GPa which all higher than that of the uncoated Ti–Al which was 5.65 GPa. However, the critical load of the Cr4–Nb coating ~21.64 was higher than that of the Cr–Nb4coating ~17.6. And the specific wear rate of Cr–Nb4coating, Cr4–Nb coating and uncoated Ti–Al were 3.54 × 10−4, 0.01 × 10−4and 1.53 × 10−4mm3 N−1 m−1,respectively. The low-wear mechanism of the coatings is discussed in detail in this paper. © 2017 Institute of Materials, Minerals and Mining and Informa UK Limited, trading as Taylor & Francis Group.

ISSN No.:1751-5831

Translation or Not:no

Date of Publication:2017-04-03

Co-author:魏祥飞,Wei Dongbo,Zhao, Hongyuan,Wang, Chun,Liskiewicz, Tomasz

Correspondence Author:Zhang Pingze

Date of Publication:2017-04-03