レーザクラッディングNiCrAlY皮膜の高温酸化挙動
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概要
- 論文の詳細を見る
As for plants, higher operation temperature is required so as to attain higher efficiency. The plant construction material requires not only good mechanical property at higher temperature but also better oxidation resistantce. It has become difficult to satisfy these requirements simultaneously by a single bulk material. One of the countermeasures is surface treatment such as PTA (Plasma transferred arc weldinhg), CVD (Chemical vapor deposition), PVD (Physical vapor deposition) and so on. Among surface treatment laser cladding is one of the outstanding methods because its higher power density enables to clad refractory materials or even ceramics. However, there has been little work on the oxidation behavior of laser clad NiCrAlY layer. Therefore the oxidation behavior of laser clad NiCrAlY layer formed with single layer so as to take account of the influence of dilution from the substrate. Influence of Al content and heat treatment were also investigated. The results obtained are as follows ;(1) The oxide formed on the NiCr10AlY and NiCr20AlY clad layers was mainly a-A1_2O_3 and the growth rate of the oxide obeys parabolic rate law.(2) The parabolic rate constant of the NiCr10AlY clad layer is approximately the same with that of the bulk material, but that of the NiCr20AlY clad layer is larger by 1〜2 orders of magnitude. The difference in parablic rate constant is caused by the formation of unstable faster growing θ-Al_2O_3 on NiCr20AlY clad layer at the initial stage of the oxidation.(3) The heat treatment makes the distribution of aluminum in the clad layer more homogenious which enhances the nucleation of Al_2O_3 at the initial stage of the oxidation, resulting in the lower parabolic rate constant.
- 社団法人溶接学会の論文
- 1998-02-05
著者
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西田 稔
愛媛大学
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西田 稔
愛媛大学工学部機能材料工学科
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荒木 孝雄
愛媛大学工学部機能材料工学科
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岩本 博之
千代田化工建設(株)
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西田 耕一
愛媛大学大学院
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浅野 泰介
愛媛大学工学部
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澄川 貴司
愛媛大学大学院
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澄川 貴司
愛媛大学大学院:(現)いすゞ自動車(株)
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西田 稔
愛媛大学工学部
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荒木 孝雄
愛媛大学工学部
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