SiC_(f)/SiC复合材料铣削加工表面质量北大核心CSCD

使用PCD立式铣刀对聚合物浸渍裂解法(PIP)制备的SiC_(f)/SiC复合材料开展单因素铣削试验,通过对加工中产生的切削力和加工后的表面粗糙度进行测量,分析了铣削工艺参数对其的影响;对加工表面、纤维断口进行SEM分析,讨论了SiC_(f)/SiC复合材料加工表面的形成。研究结果表明,表面粗糙度与切削力的变化趋势相同,高主轴转速和小切削宽度有利于得到表面粗糙度较小的加工表面;近孔洞区域与远离孔洞区域的材料去除方式不同;材料中纤维发生面内偏移和层间屈曲,纤维存在多种去除方式。

Quality of Milling Surface of Silicon Carbide Fiber Reinforced Silicon Carbide Ceramic Matrix Composites

The single factor milling test of SiC_f/SiC composites prepared by PIP was carried out with PCD milling cutter. The effects of milling process parameters on the cutting force and surface roughness after machining were analyzed. The formation mechanism of machined surface morphology of SiC_f / SiC composites was discussed by SEM analysis of machined surface and fiber fracture. The results show that the surface roughness and cutting force have the same change trend. High spindle speed and small cutting width are conducive to obtain the machined surface with small surface roughness. The material removal method near the hole area is different from that far away from the hole area. The in-plane deflection and interlaminar buckling of fibers in materials lead to a variety of fracture modes of fibers.