C/SiC复合材料磨削的表面/亚表面损伤

采用树脂结合剂金刚石砂轮对二维正交编织结构C/SiC复合材料进行了平面磨削加工实验。通过对磨削加工表面形貌、磨削表面中碳纤维区域的粗糙度、磨削亚表面形貌的分析与测量,对C/SiC复合材料磨削表面/亚表面损伤进行了研究。结果表明:磨削表面中碳纤维损伤形式以阶梯状脆性断裂为主。对于编织方向平行于进给速度方向的纤维区域,脆性断裂尺寸、表面粗糙度受工艺参数影响较小;而对于编织方向垂直于进给速度方向的纤维区域,脆性断裂尺寸、表面粗糙度随进给速度增大无明显变化,但随磨削深度增大而明显增大。碳纤维区域亚表面损伤形式主要为阶梯状脆性断裂,而SiC区域亚表面损伤形式主要为脆性断裂及微裂纹,且损伤程度在实验参数范围内无明显差异。

Surface/subsurface damage in C/SiC composites grinding

Surface grinding tests were conducted on two-dimensional orthogonal fabricated C/SiC materials with resin bond diamond wheel.The ground morphology and surface roughness in carbon area were analyzed.The damage of the ground surface and subsurface was studied.The results showed that the main damage of carbon fiber was terraced fracture.In addition,for the area which paralleled to the feedrate,the fracture size and surface roughness were slightly affected by grinding parameters,while for carbon fiber area which was vertical to the feedrate,fracture size and surface roughness changed slightly with increasing feedrate,but increased significantly with increasing grinding depth.For SiC area,the main subsurface damages was brittle fracture and micro crack,and the damage size was affected slightly by grinding parameters.