Study on Surface Roughness of Modified Silicon Carbide Mirrors polished by Magnetorheological Finishing

5th Annual International Conference on Material Science and Environmental Engineering

材料科学;生态环境科学

Du, Hang^1,2 ; Song, Ci^1,2 ; Li, Shengyi^1,2

College of Mechatronics and Automation, National University of Defense Technology, Changsha

410073, China^1

Hunan Key Laboratory of Ultra-precision Machining Technology, Changsha

410073, China^2

关键词: Grinding heads;    High-precision;    Magnetorheological finishing;    Mirror substrate;    Mirror surface roughness;    Silicon carbides (SiC);    Surface accuracy;    Surface flaw;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/301/1/012164/pdf
DOI  :  10.1088/1757-899X/301/1/012164

来源: IOP

【 摘 要 】

In order to obtain high precision and high surface quality silicon carbide mirrors, the silicon carbide mirror substrate is subjected to surface modification treatment. In this paper, the problem of Silicon Carbide (SiC) mirror surface roughness deterioration by MRF is studied. The reasons of surface flaws of "Comet tail" are analyzed. Influence principle of MRF polishing depth and the surface roughness of modified SiC mirrors is obtained by experiments. On this basis, the united process of modified SiC mirrors is proposed which is combined MRF with the small grinding head CCOS. The united process makes improvement in the surface accuracy and surface roughness of modified SiC mirrors.