Oxidation Resistant Coating for Niobium by Combining Hot Dipping in Molten Aluminum Coating and Anodic Oxidation

The combination of hot dipping in molten aluminum and the subsequent anodic oxidation to dense Al2O3 films was studied to prepare an oxidation-resistant coating on niobium surface. By immersing Nb into a molten Al bath, granular NbAl3 was precipitated and improved the coherency of the film to the su...

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Veröffentlicht in:Journal of the Japan Institute of Metals and Materials 1995, Vol.59(9), pp.967-972
Hauptverfasser: Kumon, Takeshi F., Suzuki, Ryosuke O., Ono, Katsutoshi
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container_end_page 972
container_issue 9
container_start_page 967
container_title Journal of the Japan Institute of Metals and Materials
container_volume 59
creator Kumon, Takeshi F.
Suzuki, Ryosuke O.
Ono, Katsutoshi
description The combination of hot dipping in molten aluminum and the subsequent anodic oxidation to dense Al2O3 films was studied to prepare an oxidation-resistant coating on niobium surface. By immersing Nb into a molten Al bath, granular NbAl3 was precipitated and improved the coherency of the film to the substrate. Amorphous Al2O3 was formed by anodic oxidation of the Al layer and crystallized to corrosion resistant α-Al2O3 by the subsequent heat treatment. The Nb substrate after this combined treatment did not form any niobium oxides even after heating in air for 64.8 ks at 1073 K, and the oxygen increment in the Nb bulk was suppressed below 400 mass ppm.
doi_str_mv 10.2320/jinstmet1952.59.9_967
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subjects alumina coating
aluminum film
anodic oxidation
hot dipping
NbAl3
niobium
oxidation resistance
title Oxidation Resistant Coating for Niobium by Combining Hot Dipping in Molten Aluminum Coating and Anodic Oxidation
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