[Table of Contents]

Plasma and Fusion Research

Volume 9, 1405004 (2014)

Regular Articles

Evaluation of Adhesion Strength of Er2O3 Coating Layer for an Advanced Breeding Blanket System Applied to Thermal Cycles using Nano-Scratch Method
Yoshimitsu HISHINUMA, Teruya TANAKA, Kenji MATSUDA1), Daisuke TAKADA2), Toshihiro HOSEN2), Akio SAGARA and Takeo MUROGA
National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
1)
University of Toyama, Toyama 903-8555, Japan
2)
RHESCA Co.,Ltd, Hino, Tokyo 191-0011, Japan
(Received 7 August 2013 / Accepted 1 December 2013 / Published 28 February 2014)

Abstract

The electrical insulator and hydrogen permeation barrier coatings are important materials to realize the liquid metal and molten-salt typed breeding blanket systems. We found that erbium oxide (Er2O3) is one of the promising materials as the electrical insulator and hydrogen permeation restraint coatings. Establishing the mechanical property evaluation method for these coating is extremely important to certify the durability of coating material in the blanket systems. The adhesion strength property, which is one of the key mechanical properties of coating materials, was investigated using the nano-scratch method. From the results, it was found that the nano-scratch test was able to evaluate the adhesion strength of the Er2O3 coating synthesized by the Metal Organic Chemical Vapor Deposition (MOCVD) process with high reproducibility. Furthermore, the adhesion strength of the Er2O3 coating before and after thermal cycling was evaluated using this method. The adhesion strength after 50 thermal cycles at 700° C was kept around 70% compared with that before thermal cycling.

Keywords

blanket system, Er2O3 coating, scratch test, adhesion strength, thermal cycling

DOI: 10.1585/pfr.9.1405004

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This paper may be cited as follows:

Yoshimitsu HISHINUMA, Teruya TANAKA, Kenji MATSUDA, Daisuke TAKADA, Toshihiro HOSEN, Akio SAGARA and Takeo MUROGA, Plasma Fusion Res. 9, 1405004 (2014).