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对于金刚石-硫化锌复合红外光学窗口,结构中存在的热应力和挠曲度的大小对其可靠性有很大的影响。利用弹性应变模型研究了在光学焊接中不同粘接温度和金刚石厚度下金刚石-硫化锌复合窗口将发生的最大应力、曲率和衬底到边缘的挠曲度。计算结果表明,当膜厚在极值附近时,复合结构明显弯曲、ZnS表面的应力极大;如果粘接温度较高,复合结构将严重变形,ZnS中所受的应力可能会超过其自身的断裂强度。当对金刚石-硫化锌复合红外窗口设计时,了解结构中存在的热应力和挠曲度的大小是很有用的。
For the diamond-ZnS composite IR optical window, the magnitude of thermal stress and deflection in the structure have a great influence on its reliability. The maximum stress, curvature and substrate-to-edge deflection of the diamond-zinc sulfide composite window under different bonding temperatures and diamond thicknesses were studied by using elastic strain model. The calculated results show that when the film thickness is in the vicinity of the extreme value, the composite structure is obviously bent and the stress on the surface of the ZnS is extremely great. If the bonding temperature is high, the composite structure will be seriously deformed and the stress in the ZnS may exceed that of itself Breaking strength. When designing a diamond-zinc sulfide composite infrared window, it is useful to know the magnitude of the thermal stresses and deflections present in the structure.