溶接学会論文集
Print ISSN : 0288-4771
コールドスプレー法によるNiAl高温耐食性皮膜の作製と評価
-作動ガスの影響と原料粉末へのセラミックス粒子添加の効果-
園田 哲也桑嶋 孝幸中村 満斉藤 貴伊藤 乃
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2010 年 28 巻 4 号 p. 376-382

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The problem of high-temperature corrosion caused by wood fuel ash produced by the wood biomass combustion apparatus, has arisen from the expanded usage of wood biomass energy in recent years. The purpose of this study is to develop chromium-free composite coating that provides high durability and corrosion resistance against wood fuel ash with cold spray technology.
In this study, fabrication of NiAl intermetallic compound coatings by cold spraying using compressed air is examined. Particle velocity and deposition efficiency were measured to attempt a comparison between compressed air and helium gas. The coating characteristics such as microstructure, micro Vickers hardness and corrosion resistance were evaluated. As a result, a dense NiAl intermetallic compound coating was formed with compressed air by using the powder prepared by that blending Ni-Al mechanically milled powder and Al2O3 powder. Moreover, the coating showed excellent corrosion resistance in the polarization measurements and high temperature corrosion tests.

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