Effect of impingement angle and WC content on high temperature erosion behavior of SiC-WC composites

摘要

Hot pressed dense SiC-(0, 10, 30 or 50 wt%)WC composites were subjected to erosion against SiC particles at 800 degrees C. Effects of WC content and angle of impingement (30, 60 or 90) on the erosion performance of composites were evaluated. Erosion rate ranged from 2.1 x 10(2) mm(3)/kg to 7.7 x 10(2) mm(3)/kg with varying WC content or angle of impingement. The erosion rate of the composites increased with increasing the impingement angle from 30 to 90, and decreased with WC content up to 30 wt%. Minimum and maximum erosion wear rates were obtained for SiC-30 wt% WC composites at 30 and for SiC-50 wt% WC composites at normal impact, respectively. Grain fracture and pull-out were observed as major mechanisms of material removal for the composites. Decreased angle of impingement led to reduced grain fracture and pull-out, and hence reduction in material removal. Owing to increased fracture toughness with incorporation of WC particles, the composites showed less fracture and removal of WC particles up to 30 wt% reinforcement.