模具材质对CFRP平面反射镜离焦面形误差的研究

离焦像差是影响CFRP平面反射镜的面型精度的主要像差之一。采用T700碳纤维复合材料预浸料,在合理的铺层方案和制备工艺基础上,选用浮法玻璃、硼硅酸盐玻璃和微晶玻璃等三种材质为模具,通过仿真和实验研究了模具材质不同引起成型CFRP平面反射镜面形像差中的离焦像差。其中,浮法玻璃模具、硼硅酸盐玻璃模具和微晶玻璃模具引起的CFRP平面反射镜的离焦像差分别为0.023λ、0.008λ、0.003λ(波长λ=10.6μm)。分别从定性和定量的角度得出了:模具材质热膨胀系数与CFRP复合材料热膨胀系数越相近离焦像差越小,离焦像差与模具热膨胀系数的关系为P=(2225.9x+0.0007)λ。为制备应用于长波红外波段CFRP平面反射镜的模具选取提供了参考数据。

Study on Power Error of CFRP Plane Reflector Caused by Mold Material

Power is one of the major aberrations affecting the surface accuracy of the CFRP planar reflector.On the ba-sis of reasonable ply orientation and fabrication technology,the power of CFRP planar reflector caused by mold materi-al is studied by simulation and experiment,using T700 carbon fiber prepreg as the material and float glass,borosilicate glass and glass-ceramic as the mold.The powers of the CFRP planarreflectorscaused by float glass molds, borosilicate glass molds and glass-ceramic molds are 0.023λ, 0.008λ, 0.003λ, respectively (the wavelength λ=10.6μm) .From the qualitative and quantitative point of view,the closer the mold material thermal expansion coefficient and the thermal ex-pansion coefficient of CFRP composite material, the smaller the defocus aberration. And the relationship between defo-cus aberration and mold thermal expansion coefficient is P=(2225.9x+0.0007)λ.These provide the reference data for the selection of moldsfor the fabrication of CFRP planar reflector used in long-wave infrared band.