Ablation and thermal shock resistance properties of C/SiC jet vane

The ablation properties of C/SiC composites jet vane were evaluated using the plasma wind tunnel ablation equipment. The ablation mechanism of C/SiC composites was explored and the thermal shock-resistance of the jet vane was analyzed by plane flake board model. The results show that the angle between the plasma gas flowing direction and jet vane present great influence on the ablation of C/SiC composites. The linear ablation ratio of the composites decreases from the maximal value of 1.007 mm/s at the front direction of jet vane to the minimal value of 0.052 mm/s at the brim direction of the component. The difference value between these two ablation ratios is at a factor of about 20. The ablation mechanisms of components are particles erosion and mechanical denudation. Material failure is mainly caused by the thermal stress.