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5.蓝宝石在高温下的性能蓝宝石是市场上出售的一种最耐用的红外窗口材料。它只限于在中波区工作,在高温(>500℃)时,它在4-5μm区域有很大的光发射。在商售的窗口材料中,蓝宝石对雨水和砂子腐蚀的耐受性最大,它的耐热冲击性比尖晶石、氮氧化合铝、氟化镁以及硫化锌都高。在中波透射材料中,只有磷化镓的耐热冲击性比蓝宝石大。蓝宝石勉强可以用于一些涉及快速加热的应用。根据蓝宝石在25℃时的特性预测,它具有优良的耐热冲击性,但在高温下,由于它的热传导性和强度的下降,它的
5. Sapphire performance at high temperatures Sapphire is the most durable infrared window material available on the market. It is limited to work in the mid-wave region and has a large light emission in the 4-5 μm region at high temperatures (> 500 ° C). Among commercially available window materials, sapphire is most resistant to rain and sand corrosion and has higher thermal shock resistance than spinel, aluminum oxynitrides, magnesium fluoride, and zinc sulfide. In medium wave transmission materials, only gallium phosphide has a greater thermal shock resistance than sapphire. Sapphire barely can be used for some applications involving rapid heating. Based on the properties of sapphire at 25 ℃ predicted that it has excellent thermal shock resistance, but at high temperatures due to its thermal conductivity and strength decline, its