HU Chengping1, ZHAO Yalin1, WANG Jiepeng1, DUAN Haitao1*, KOU Hongchao2, ZHANG Tiebang2, LI Jian1*
(1. Wuhan Research Institute of Materials Protection, Wuhan 430030, China 2. State Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072,China)
Abstract: To investigate the tribological properties of AlCoCrFeNiCu high-entropy alloy in hydrogen peroxide with strong oxidizability, a series of pin-on-disk tribo-tests were carried out using AlCoCrFeNiCu as pin and three types of engineering ceramics (ZrO2, SiC and Si3N4) as disk in a 90% hydrogen peroxide. The characterization techniques, including white light confocal microscope (CM), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS), were employed to analyze the worn surfaces, and the wear mechanism of AlCoCrFeNiCu/ceramic tribo-pairs was discussed. The results showed that when sliding against SiC and Si3N4 ceramics, the AlCoCrFeNiCu pins had mild wear and low friction coefficient. The wear mechanism of AlCoCrFeNiCu/ZrO2 tribo-pair was a combination of adhesive wear, abrasive wear and oxidative wear. Both AlCoCrFeNiCu/SiC and AlCoCrFeNiCu/Si3N4 tribo-pair exhibited polishing oxide wear and three-body abrasive wear. The effect of boundary lubrication was found for AlCoCrFeNiCu/Si3N4 tribo-pair.
Key words: AlCoCrFeNiCu; hydrogen peroxide; high-entropy alloy; ceramic; friction and wear
E-mail: lijianwuhan@163.net
Tribology, Vol. 31, Issue 5, 2011, 439~446
