Influence of fiber content on C/C-SiC brake materials fabricated by compression molding and hot sintering. (August 2019)

• Record Type: Journal Article
• Authors: Tang, Chen; Dang, Alei; Li, Tiehu; Zhao, Tingkai; Li, Hao; Jiao, Shasha
• Is Part Of: Tribology international. Volume 136(2019)
• Page Start: 404
• Page End: 411
• Publication Date: 2019-08
• Subjects: Carbon fibers -- C-SiC matrices -- Mechanical properties -- Tribological behaviors; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2019.04.009
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: In this work, short carbon fibers were utilized as reinforcing materials to incorporate with C-SiC ceramics. Cf /C-SiC composites containing diverse fiber contents were fabricated by combining compression molding and hot sintering. Mechanical and tribological properties were carefully investigated. The result indicates that 30 vol% fiber content composite shows the highest flexural strength (201.42 MPa) and shear strength (116.68 MPa). The reinforcing mechanisms are summarized as fiber pulling-out, fiber debonding and fiber bridging, as well as crack deflection. Tribological testing reveals that 30% fiber content composite shows the strongest wear resistance (3.95 × 10 −6 mm 3 /N⋅m) and cyclic performances (COF of 0.27 after 50 cycles). The friction mechanisms are divided into abrasive wear, adhesion wear and oxidation wear by different wear stages. Highlights: A combined compression molding and hot sintering method was developed to fabricate Cf/C-SiC composite. 30% fiber content composite shows the highest mechanical strength and strongest wear resistance. The reinforcing mechanisms were summarized as fiber pulling-out, debonding, bridging as well as crack deflection. The wear behaviors at different stages were concluded as abrasive wear, adhesion wear and oxidation wear.