Protective layers on high-temperature alloys against hydrogen permeation

Journal Article · Sat Sep 01 04:00:00 EDT 1984 · Nucl. Technol.; (United States)

OSTI ID:6026098

Huschka, H; Luthardt, G; Portscher, V E

One crucial point of the prototype nuclear process heat is the permeation of hydrogen isotopes through the walls of the heat exchanger materials. The in situ growth of oxide layers provides an effective barrier against hydrogen permeation. Basic investigations with a large scope of heat-resistant alloys have been carried out by Kernforschungsanlage (KFA) Julich. Further research has been done by NUKEM and Maschinenfabrik Augsburg-Nurnberg, Neue Technologie, to develop superior coatings that are effective from reactor startup. The NUKEM procedure is a simple and cost-efficient method. It comprises oxidation of the disk-shaped metal samples in excess steam (with or without addition of other gases) at elevated temperatures in a once-through manner. Adjustments of various parameters are being made to work out the conditions for optimal quality of the oxides on several alloys. Evaluation is based on permeation measurements with deuterium in the Deuperm facility of KFA. In some cases, tritium permeability was determined at the University of Munster. Backup information is provided by scanning electron microscope analysis, diffractometry, and microprobe examination.

• Research Organization: NUKEM GmbH, D 6450 Hanau
• OSTI ID: 6026098
• Journal Information: Nucl. Technol.; (United States), Journal Name: Nucl. Technol.; (United States) Vol. 66:2; ISSN NUTYB
• Country of Publication: United States
• Language: English

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