搜索 - 科创

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辐射冷却适合小推力发动机/喷管扩张段，结构简单粗暴，但是需要热强材料。所以对于高空工作的小推力发动机或者小火箭的起飞级发动机，使用辐射冷却是可行的。

估计要一部分气膜冷却不光抗氧化，还是热强材料。铱锇合金可以在2000-2200摄氏度下保持90%强度，广泛用于无冷却发动机和热核反应室，因为其特有的脆硬和高熔点，普通的热工加工和车铣加工根本没辙。

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