SiC_f/SiC 复合材料铣磨表面质量评价方法试验研究

Since SiC_f/SiC composite is typical heterogeneous and anisotropic material,the metal material quality evaluation system is not fully applicable. There is an urgent need to establish a suitable surface quality evaluation method. Combined with the ultrasonic vibration-assisted milling-grinding test,comparing the stability of the 2D roughness R_a and 3D roughness S_a of the milling-grinding surface,and exploring the influence of the size of the S_a measurement area on the measurement results. Combined with the macroscopic,microscopic and 3D morphology, analyzing and studying the experimental results. Based on the area ratio of the more obvious areas with the appearance of pits on the milling-grinding surface,the analysis and research on the surface quality are carried out. The results show that S_a is more suitable as the characteristic parameter of milling-grinding surface roughness of SiC_f/SiC composites. And the minimum measurement area size of S_a is 7 mm×7 mm. Based on roughness analysis,the milling-grinding surface quality can be further evaluated by combining macroscopic,microscopic and 3D topography. Using the area ratio of obvious pits on the surface,the quantitative analysis of the area,which is of a great influence on the surface quality,is basically realized.