基于超薄玻璃的嵌套式圆锥近似Wolter-I型聚焦望远镜采用环氧树脂胶作为镜片装配的关键粘结材料, 其微米级厚度的胶层粘结强度决定了望远镜的力学性能。文中研究了“超薄镜片-F131环氧树脂胶-石墨”组成的粘结结构在不同固化环境湿度、不同石墨表面粗糙度下的粘结强度。结果表明, 粘结强度随着环氧树脂固化湿度的增加而减小, 随着石墨表面粗糙度的增加而增加。进一步, 通过比较石墨表面层剥离面积比, 确定石墨表面层剥落是造成粘结结构失效的主要形式。最后, 引入B基准值作为粘结强度评价指标, 提高粘结性能评价的准确性和可靠性, 为望远镜装配提供了参考。

Epoxy is a key bond material in the mirror assembly of nested conical approximation Wolter-I type focusing telescope which is based on ultra-thin glass. The mechanical properties of the telescope is determined by the bonding strength of the adhesive layer with micron-scale thickness. The bonding strength of "ultra-thin glasses-F131 epoxy -graphite" bonding structure under different curing environments and surface roughness of graphite was studied. The results show that the bonding strength decreases with the increase of the curing humidity of epoxy and increases with the increase of the surface roughness of the graphite. The peel of the graphite was found to be the main type of failure in bonding structure by comparing the surface peeling area ratio of graphite. Finally, the B basis was introduced as an evaluation of bonding strength to improve the accuracy and reliability of the bonding properties for telescope assembly.