Effect of La2O3 addition on wear properties of Ni60a/SiC coating using laser-cladding. (April 2022)

• Record Type: Journal Article
• Authors: Shi, Yameng; Li, Jingbin; Zhang, Jie; Wen, Baoqin; Li, liqiao; Wang, Xianfei; Ren, Sixue
• Is Part Of: Optics & laser technology. Volume 148(2022)
• Publication Date: 2022-04
• Subjects: Laser-cladding -- Phase composition -- Rare earth element -- Friction and wear; Optics -- Periodicals; Lasers -- Periodicals; Electronic journals; 621.366
• DOI: 10.1016/j.optlastec.2021.107640
• Languages: English
• ISSNs: 0030-3992

Abstract

Highlight: The addition of nano-rare-earth La2 O3 refines the structure of composite coating. La2 O3 uniformly distributes the elements in Ni60a/SiC composite coating. Formation of new phases in laser clad coating is realised. The wear resistance of the composite coating improves by adding La2 O3 . Abstract: This study investigates the influence of rare-earth La2 O3 content on the wear resistance of a laser clad coating. Different contents of nano-rare-earth La2 O3 were added to a Ni60a/SiC composite powder to analyse the phase composition, element distribution and friction and wear characteristics of the coating to determine the optimum amount of rare-earth La2 O3 to be added. The results showed that the coating with 2 wt% La2 O3 added based on the Ni60a/SiC composite powder exhibited the best comprehensive properties. X-ray diffraction and X-ray photoelectron spectroscopy analyses showed that new phases were formed in the coatings with 2 wt% La2 O3 mainly consisted of hard phases such as Cr7 C3 and CrC. Scanning electron microscopy revealed that the coating grain with 2 wt% La2 O3 was refined, the density increased and the distribution of coating elements was more uniform. The wear surface coating was slightly peeled off, and a friction coefficient of 0.63 and a wear depth of 15.79 µm were achieved, which were 3% and 86% lower than those of the 65Mn matrix, respectively. The wear amount was 0.002 g. The wear surface experienced an oxidation reaction.