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The martensitic steel DIN 1.4914 (MANET) is the candidate for the first wall and structural material of the European self-cooling liquid blanket concept demonstration power reactor DEMO. In a fusion reactor, tritium permeating through structural material has to be controlled for safety and economic reasons. Coatings have been proposed for decreasing the tritium permeation rate, the most promising being Al(2)O(3), which reduces the permeation rate by 2 to 3 orders of magnitude. In this paper the permeation behaviour and insulation of such a coating deposit is investigated. A hot-dip process was applied to produce a permeation barrier on MANET steel. The formation of the alumina layer is a two step process, forming firstly an intermetallic layer of FE(x)Al(y) followed by the alumina layer which is formed on the intermetallic layer. The oxide layer and bulk material was characterized by optical metallography, Vickers micro-hardness measurements, scanning electron microscope (SEM) with energy dispersive X-ray analysis (EDX), and X-ray diffraction (XRD) on the surface. Measurements of the permeation rate of deuterium in the bare and coated MANET were performed using a gas permeation technique. Measurements were conducted over the temperature range 573 K to 743 K with deuterium driving pressures in the range 3 kPa to 50 kPa.

Additional information

Authors: GLASBRENNER H, Forschungszentrum Karlsruhe GmbH (DE);PERUJO A, JRC Ispra (IT);SERRA E, JRC Ispra (IT)
Bibliographic Reference: Paper presented: 5th Topical Meeting on Tritium Technology in Fusion, Fission and Isotopic Applications, Belgirate (IT), May 28 - June 6, 1995
Availability: Available from (1) as Paper EN 39069 ORA
Record Number: 199610095 / Last updated on: 1996-02-16
Original language: en
Available languages: en
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