Contrast Role of Third Body Layer and Hard Abrasives in the Wear Process of a TiAlSiN Hardness-Modulated Multilayer Coating: A Case Study on the Effect of Normal Load and Velocity

• Published in: Coatings (Basel) Vol. 14; no. 7; p. 821
• Main Authors: Zhao, Fan, Zhu, Zhou, Yu, Jiaxin, Luo, Zhiquan, Qi, Huimin
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.07.2024
• Subjects: Abrasive wear; Abrasives; Abrasives industry; Adhesive strength; Analysis; Case studies; Coating effects; Coatings; Coefficient of friction; Custom design; Electron microscopes; Factorial analysis; Factorial experiments; Friction; Hardness; Investigations; Load resistance; Mechanical properties; Morphology; Multilayers; Nanohardness; Protective coatings; Scanning electron microscopy; Shear strength; Silicon nitride; Stress concentration; Substrates; Surface hardness; Tin; Tribology; Velocity; Wear rate; Wear resistance; Working conditions; Workpieces; United Kingdom > UK; United States > US
• ISSN: 2079-6412; 2079-6412
• DOI: 10.3390/coatings14070821

Working conditions exert an important influence on the tribological properties of protective coatings, thus affecting the wear resistance of workpieces. In this work, a TiAlSiN hardness-modulated multilayer coating with a good match of strength and toughness was deposited on WC-Co substrates. The adhesive wear played a predominant role under the condition of a larger normal load and lower velocity, leading to the formation of a third body layer composed of compressed and lubricating oxides. As a result, the wear rate of the coating tested at 20 N reduced by 23% of that tested at 5 N. Instead, abrasive wear was more manifest, leading to the formation of big-size abrasives, and thus the wear rate increased by 2.8 times while the velocity elevated from 4 mm/s to 16 mm/s. A full factorial analysis of the wear behaviors, including the nanohardness and roughness of the wear track, and the friction coefficient and wear rate of the coating, offered good guidance for the comprehension of the wear form of the TiAlSiN multilayer coating. The results demonstrated the optimization of multilayer structures for TiAlSiN coatings to attain better wear resistance under coupling conditions of normal load and velocity: harder or more lubricated sublayers.