Microstructure and Dry-Sliding Wear Behavior of Thermal Sprayed and Fused Ni-Based Coatings with the Addition of La2O3 |
| |
Authors: | Zhenyu Zhang Zhiping Wang Bunv Liang |
| |
Affiliation: | 1. Mechanical Engineering Department, Lanzhou Polytechnical College, 730050, Lanzhou, Gansu, People’s Republic of China 2. State Key Laboratory of New Nonferrous Metal Materials, Lanzhou University of Technology, 730050, Lanzhou, Gansu, People’s Republic of China
|
| |
Abstract: | A Ni-based alloy with 1.5 wt% of La2O3 powders was thermal sprayed onto steel substrate. The microstructure and dry sliding wear behavior of the coatings were studied by XRD, field emission gun scanning electron microscope (FEGSEM) and SEM analyses. The microstructure of the coating with 1.5 wt% of La2O3 differs widely from the coating without La2O3; the typical microstructure with 1.5 wt% of La2O3 is composed of net-like dendrite (Cr, Fe)23C6 and Cr7C3, cellular-dendrite Fe23(C, B)6, γ-Ni + Ni5Si2 interdendritic lamellar eutectic. Interestingly, significant amounts of net-like (Cr, Fe)23C6 and Cr7C3 hard phases as a wear-resistant skeleton were formed and uniformly dispersed in the coating. Meanwhile, blocky and rod-like hard-phase CrB scattered in the coating can also contribute to improving the wear resistance. The novel microstructure, therefore, is beneficial for wear resistance. Friction and wear tests without lubricant show that the friction coefficients of the coating are less than 0.57. There is an approximately linear relationship between friction coefficients and sliding speed. The wear rate slightly increases with an increase of load, and the wear rate of the coating slightly decreases with sliding speed. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|