选区激光熔化AlSi10Mg合金镜的表面性能

Surface characteristics of selective laser melted AlSi10Mg mirrors

基于激光增材制造技术适用于复杂轻量化结构光学元件的快速成形,且采用同种材料一体化光机结构能够降低空间光学成像系统的温度敏感性,提高稳定性,利用选区激光熔化(SLM)技术制备全铝空间光学相机用AlSi10Mg铝合金反射镜。研究结果表明:采用SLM制备的AlSi10Mg铝合金组织致密(相对密度大于99.5%),且退火后力学性能优异;通过单点金刚石车削(SPDT)获得光学级表面,表面粗糙度达8~13 nm,面形精度达到0.28λ(λ为波长,λ=632 nm)。该研究结果可以应用于空间光学反射镜的设计与制造。

Considering that additive manufacturing(AM)technologies is adapted for the optical components with complex lightweight structure,using the opto-mechanical structure with the same material can reduce temperature sensitivity,selective laser melting(SLM)technology was utilized to fabricate the AlSi10Mg mirror for aluminum alloy space optical sensor.The results show that the relative density of as-fabricated AlSi10Mg sample is above 99.5%,and the tensile strength and the ductility are excellent.The single point diamond turning(SPDT)is applied to deliver the optical surface with thoughness of 8−13 nm and accuracy of 0.28λ(λ=632 nm).The results can be used to manufacture the lightweight space optical mirrors.