Effect of FeSi2 content on tribological properties of C/C–SiC–FeSi2 composites. Issue 17 (1st December 2019)

• Record Type: Journal Article
• Authors: Ning, Yifan; Fan, Shangwu; Wang, Le; Luan, Chenghua; Deng, Juanli; Zhang, Litong; Cheng, Laifei
• Is Part Of: Ceramics international. Volume 45:Issue 17(2019)Part B
• Page Start: 23431
• Page End: 23443
• Publication Date: 2019-12-01
• Subjects: Fe-Si alloy -- C/C–SiC -- Friction -- Wear; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.08.047
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this work, tribological properties of different FeSi2 -modified C/C–SiC composites have been studied using disk-on-disk type laboratory scale dynamometer. Results indicated that line wear rate decreased significantly with the introduction of FeSi2 in C/C–SiC. In addition, when C/C–SiC is modified with FeSi75, linear wear rate decreased obviously and reduced to 10% of C/C–SiC wear rate at high braking speeds. However, coefficient of friction (CoF) attenuated seriously due to excess introduction of Fe–Si alloy and this attenuation can be solved by reducing the content of FeSi2 in C/C–SiC–FeSi2 . In order to have simultaneous advantages of low wear rate and high CoF, appropriate FeSi2 content in C/C–SiC was identified (such as, using FeSi95). Furthermore, the development of friction surface of C/C–SiC–FeSi2 through microstructural image registration of the surface after a range of braking stops is reported. It has been found that the introduction of FeSi2 can reduce the roughness of friction surface after braking stops and increase the integrity of friction films. This continuous friction film that covers C/C region can effectively reduce wear rate. However, excessive alloy friction film will reduce surface roughness and weaken the effect of plough. Therefore, high CoF is hard to maintain at high braking speeds. From this study, three types of friction films are identified, which are generated by different FeSi2 contents in C/C–SiC. Additionally, their morphologies are characterized to illustrate the effect of FeSi2 content on tribological performance of the composites.