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Preparation of Al2O3/Cr2O3 tritium permeation barrier with combination of pack cementation and sol–gel methods

In this paper, a layered Al2O3/Cr2O3 composite coating was prepared on the surface of super-clean reduced activation martensitic (SCRAM) steel by the combination of pack cementation and sol-gel methods as a tritium permeation barrier. First, the pack cementation processes was conducted at 980?°C for 30?min to form a chromed layer and then the sample was oxidized to form Cr2O3 layer at 760?°C for 2?h. Subsequently, the sol-gel method was conducted on the as-prepared Cr2O3 coating and Al2O3/Cr2O3 composite coating was finally prepared with subsequent thermochemical treatment. The results showed the first forming Cr2O3 coating was consisted of a 6??m thick Cr2O3 exterior layer and a 2??m thick interior diffusion layer due to inter-diffusion of Cr and Fe. The Al2O3/Cr2O3 composite coating was a three-layered structure with a total thickness of 10.5??m. The outer layer was Al2O3, the middle layer was a mixing layer consisting of Al2O3 and Cr2O3, and the inner layer was a diffusion Cr,Fe layer. Well- crystallized ?-Al2O3 formed in the coating at 960?°C which is below the formation temperature of ?-Al2O3 resulting from the templet effect of isostructural Cr2O3. The hydrogen permeation test results revealed Al2O3/Cr2O3 composite coating exhibited a good barrier property against hydrogen penetration, thus the composite coating maybe a good choice to increase the hydrogen permeation resistance of SCRAM steel.

» Author: Shuaijie Feng, Yan Wang, Cheng Zhang, Chunlan Luo, Juexin Xu, Jinping Suo

» Reference: Fusion Engineering and Design, Volume 131

» Publication Date: 01/06/2018

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This project has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement n° [609149].

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