耐熱合金シ-ト材のヘリウム中腐食特性
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概要
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Corrosion behavior of heat resistant alloys sheets, which would be used for gas seal elements of an experimental VHTR in Japan, was investigated in a helium environment. Materials were Hastelloy X, Incoloy 800 and Incoloy MA 956. The test temperature range was 700-1, 000°C, and the duration time was 1, 000h.<BR>Weight change of specimens of Hastelloy X and Incoloy 800 was approximately proportional to (time)<SUP>1/2</SUP>, whereas that of Incoloy MA 956 was proportional to (time)<SUP>1/3</SUP>.<BR>For protection of the alloys, two surface treatments, namely Al<SUB>2</SUB>O<SUB>3</SUB> coating with CVD method, and preoxidation in air, were tried. At the Al<SUB>2</SUB>O<SUB>3</SUB> coated specimens, oxidation and carburization were almost completely suppressed at a temperature range below 900°C, whereas some features of deterioration of protective film were observed at 1, 000°C.<BR>Preoxidation in air reduced carburization to some extent, but little advantageous effect on oxidation was observed. Especially, oxide film of Incoloy 800 formed in air was not protective in helium environment.
- 一般社団法人 日本原子力学会の論文
一般社団法人 日本原子力学会 | 論文
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