Effects of load on tribological properties of B4C and B4C-SiC ceramics sliding against SiC balls. Issue 3 (2nd July 2020)

• Record Type: Journal Article
• Authors: Zhang, Wei; Yamashita, Seiji; Kita, Hideki
• Is Part Of: Journal of Asian ceramic societies. Volume 8:Issue 3(2020)
• Page Start: 586
• Page End: 596
• Publication Date: 2020-07-02
• Subjects: Load -- friction -- wear -- relief structure -- tribofilm; Ceramics -- East Asia -- Periodicals; Materials science -- Periodicals; 620.1405
• DOI: 10.1080/21870764.2020.1769819
• Languages: English
• ISSNs: 2187-0764

Abstract

ABSTRACT: Pressureless sintered B4 C and B4 C-SiC ceramics were subjected to tests of dry sliding against SiC balls at 5 N, 10 N and 20 N. The effects of load on the respective tribological properties of B4 C and B4 C-SiC ceramics were studied. Meanwhile, the tribological properties and friction, wear mechanisms of B4 C and B4 C-SiC ceramics at different loads were compared. Both the friction coefficient and wear rate of B4 C ceramics first decreased and then increased with increases in load, while both the friction coefficient and wear rate of B4 C-SiC ceramics increased with increases in load. At low load, the B4 C-SiC ceramics showeda lower friction coefficient and wear rate. At intermediate load, the B4 C ceramics showed a lower friction coefficient, and no difference between the wear rates of B4 C and B4 C-SiC ceramics was apparent. At high load, the B4 C ceramics showed a lower friction coefficient, while the B4 C-SiC ceramics showed a lower wear rate. With increases in load from 5 N to 20 N for the B4 C ceramics, the wear mechanism changed from adhesive wear to delamination and spalling of tribofilm; for the B4 C-SiC ceramics, meanwhile, the wear mechanism changed from surface polishing and mild abrasion to micro-fracture.