Thermal degradation of a palladium coating on hydrogen-tight niobium membranes
Thermal degradation of a palladium coating on hydrogen-tight niobium membranes
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氢密铌膜上钯涂层的热降解
DOI：
10.1134/s1063784210010196
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
A. Lifshitz
中科院分区：
文献类型：
--
作者：
A. Busnyuk;M. Notkin;I. P. Grigoriadi;V. Alimov;A. Lifshitz
研究了钯包铌复合材料的热稳定性。钯是用等离子溅射的方法镀上的。涂层的热降解是由其防止铌氧化能力的下降来判断的。在2.5 ~ 1000.0 nm范围内，随着涂层厚度的增加，在693 K空气中加热的样品的氧化程度下降。其原因是加热引起的涂层形貌的破坏性改变，这是在扫描电镜下观察到的。涂层越厚，破坏开始温度越高。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）时不会发生变化。讨论了氢密复合膜上钯涂层热降解的关键因素和可能的机理。
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.