Thermal degradation of a palladium coating on hydrogen-tight niobium membranes |
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Authors: | A O Busnyuk M E Notkin I P Grigoriadi V N Alimov and A I Lifshitz |
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Institution: | 1.Bonch-Bruevich State University of Telecommunications,St. Petersburg,Russia |
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Abstract: | 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. |
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