模造光学玻璃非球面镜片短波通滤光膜的镀制

论述了短波通滤光膜的设计原理和计算方法,根据等效折射率和周期性对称膜系的理论,结合短波通滤光膜的技术要求,采用二氧化钛和二氧化硅作为高折射率材料和低折射率材料,计算出短波通滤光膜所需要的周期数和截止带宽度。用膜系设计软件对滤光膜系进行了优化,最终确定了满足实际制备条件的滤光膜周期数和每层膜厚,设计的短波通滤光膜光谱曲线达到了透射率的要求。依照设计结果,采用电子束蒸发的方法,在模造光学玻璃非球面镜片上镀制出符合技术要求的短波通滤光膜。滤光膜经过各种耐环境实验后,各项性能指标满足应用要求。

Numerical simulation and experimental verification of large-sized Zr-based bulk metallic glass ring-shaped parts in casting process

An outer ring of 29320 self-aliging roller bearing was used in an experimental study on the casting of Zr_(41)Ti_(14)Cu_(12.5)Ni_(10)Be_(22.5) amorphous alloy.Numerical simulations of mold filling and solidification processes were carried out to determine the velocity fields and temperature fields of the alloy melt during mold filling process as well as the temperature fields and temperature gradient fields in the course of the solidification.According to the results,a cast with a complete shape can be obtained at 1200℃under the condition that the cooling rate is greater than the critical cooling rate.The ring-shaped part with a thickness of 25 mm,an equivalent diameter of 22 mm,and a mass of 1.32 kg was prepared by gravity casting in a copper mold.X-ray diffraction and differential scanning calorimetry data revealed that the produced cast had the amorphous structure.

碳化钨模仁表面沉积Re-Ir抗高温黏连涂层研究

采用射频磁控溅射技术,在WC模仁基材表面分别生长Re、Ir单层膜及Re/Ir复合多层膜3种膜系。通过扫描电子显微镜、表面轮廓仪、X射线衍射仪以及纳米压痕仪等对所制备涂层的表面形貌、结构以及涂层力学性能进行表征,同时采用高温润湿角测量仪结合常用的镜头玻璃硝材D-ZK3与模仁进行高温浸润测试。结果表明,涂覆3种膜系后模仁力学性能及抗玻璃高温黏连性能都得到了明显改善,且Re/Ir多层膜系综合性能优于Re和Ir单层膜系,在延续基材表面精度的同时,较大幅度地提高了模仁表面硬度及弹性模量,高温状态下与玻璃硝材浸润性明显减弱,接触界面未观察到元素互扩散现象,显示良好的应用前景。