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Thermal degradation of a palladium coating on hydrogen-tight niobium membranes

机译：氢密铌膜上钯涂层的热降解

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The thermal stability of palladium-covered niobium, a composite used in hydrogen-tight membranes, is studied. Palladium is applied by the method of plasma sputtering. The thermal degradation of the coating is judged from a decrease in its ability to prevent niobium oxidation. It is found that the degree of oxidation of the samples heated in air at 693 K drops when the thickness of the coating increases in the range 2.5-1000.0 nm. The reason is heating-induced destructive modifications of the coating morphology, which are observed under a scanning electron microscope. The thicker the coating, the higher the temperature of onset of destruction. At temperatures above 873 K, the initially smooth continuous coating becomes highly porous and this porous layer does not change upon subsequent heating (up to 1273 K). Critical factors and possible mechanisms of thermal degradation of palladium coatings on hydrogen-tight composite membranes are discussed.
机译：研究了用于氢密膜的复合钯包覆铌的热稳定性。钯是通过等离子溅射的方法施加的。从防止铌氧化的能力的降低来判断涂层的热降解。发现当涂层的厚度在2.5-1000.0nm范围内增加时，在693K的空气中加热的样品的氧化程度降低。原因是在扫描电子显微镜下观察到加热引起的涂层形态破坏性变化。涂层越厚，破坏开始的温度越高。在高于873 K的温度下，最初光滑的连续涂层变得高度多孔，并且该多孔层在随后的加热（高达1273 K）下不会改变。讨论了氢密封复合膜上钯涂层热降解的关键因素和可能的机理。

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