金属表面技術
Online ISSN : 1884-3395
Print ISSN : 0026-0614
ISSN-L : 0026-0614
電析Ni-TiH2複合皮膜の高温熱処理組織
掛川 正幸見崎 吉成田辺 良美
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1980 年 31 巻 10 号 p. 529-535

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The microstructure of the electrodeposited Ni-TiH2 composite coatings annealed at 1000°C in vacuum was studied by EPMA, X-ray diffraction analysis, optical and electron microscopic observation. The matrix of composite coatings was varied into Ni-Ti solid solution by heat treatment and Ti concentration in the solid solution increased with increasing the amount of TiH2 particles in the composite coatings. It was found that the fine particles formed by thermal decomposition of TiH2 particles in the electrodeposited composite coatings were various kinds of titanium oxides or titanium and nickel double oxides. These oxide particles formed colonies in the rang of 1-5μm in diameter. The colonies uniformly dispersed in the matrix. The density of colony increased with increasing Ti contents in the coatings. The grain growth of matrix was blocked by the surrounding colonies, so that the annealed composite coatings containing a large amount of Ti had a fine structure of matrix grains (1-3μm) and particles colonies.

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