Tribological performance of DLC-coated ceramics against cemented carbide under dry sliding conditions

• Published in: Ceramics international Vol. 47; no. 12; pp. 16926 - 16934
• Main Authors: Song, Wenlong, Wang, Shoujun, Lu, Yang, An, Lei, Zhang, Qingge, Sun, Kai, Xin, Guangming, Song, Shiyong
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.06.2021
• Subjects: DLC coating; Si3N4/TiC ceramics; Surface friction; Wear resistance; Surface friction; Wear resistance; Si3N4/TiC ceramics; DLC coating
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2021.03.003

In order to improve the tribological behavior of Si3N4/TiC ceramics, DLC coating was fabricated on the ceramic surface through magnetron sputtering technology. The surface and cross-section micrographs, the adhesion between coating and substrate, the surface roughness and microhardness of the DLC-coated ceramics were investigated. Reciprocating friction tests sliding against cemented carbide ball were conducted under dry sliding conditions. The test results indicated that the DLC coating possessed superior tribological performance, which was conductive to decreasing the friction coefficient and enhancing the wear resistance of ceramics. The primary mechanisms responsible for performance improvement of the DLC-coated ceramics were attributed to the combined effects of low shear stress, excellent adhesion with substrate, high microhardness and good surface roughness. It was believed that the DLC coating was efficient in improving the load-carrying capacity and expanding the application area of ceramic materials.