Influence of grinding fiber angles on grinding of the 2D–Cf /C–SiC composites

Abstract

This paper aimed to investigate the grinding characterizations and mechanism of the 0°/90° orthogonal structure surface of the 2D–Cf/C–SiC composites under different grinding fiber angles (the angle between the grinding direction and the fiber orientation, GFA). A series of surface grinding experiments were carried out. The influence of grinding fiber angles on the grinding forces, surface morphologies and roughness were investigated. The results show that the grinding forces and surface roughness under different grinding fiber angles both follow the order 45° > 30° > 0°. The GFA also plays a significant influence on the micro structure of ground surface. Fiber bundles are damaged by the combination of peel off and tore off which depends on the GFA. The grinding mechanism of the 2D–Cf/C–SiC composites was also analyzed with the help of a single grit scratching test. The results of scratching force and surface morphologies greatly support the differences obtained during grinding. The material removal mechanism is dominant in brittle removal mode which is the combination of the fiber-layered brittle fracture and the SiC matrix cracking. These results would provide new guidance for improving the machining quality of woven fiber reinforced ceramic matrix composites.