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等離子噴涂NiCrCoAlY涂層氧化控制研究
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北京市教委科技發(fā)展項目(KM200610005026，JP009012200803)；北京工業(yè)大學博士啟動基金(52009999200701)


Oxidation Control of Plasma Sprayed NiCrCoAlY Coating
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    摘要:

    利用等離子噴涂技術制備了NiCrCoAlY粒子和涂層，研究了等離子噴涂過程中NiCrCoAlY粒子的氧化行為以及屏蔽氣體對NiCrCoAlY涂層抗高溫氧化性能的影響。結果表明，粒子在飛行過程中存在對流氧化和擴散氧化兩種氧化機制，對NiCrCoAlY粒子來說，在距噴嘴55 mm以內的射流中心處以對流氧化為主，在距離噴嘴55 mm以外將以擴散氧化為主；除飛行中的氧化外，粒子在噴涂過程中還發(fā)生形成涂層后的氧化，NiCrCoAlY粒子以飛行中的氧化為主；添加屏蔽氣體能減少噴涂過程中涂層的氧化，提高涂層的抗高溫氧化性能

    Abstract:

    NiCrCoAlY particles and coatings were prepared by plasma spraying technique. The oxidation behavior of NiCrCoAlY particles in the plasma spraying process and the influence of shrouding gas on high-temperature oxidation resistance of NiCrCoAlY coatings were investigated. The results show that there are two oxidation mechanisms during in-flight oxidation. One is convective oxidation, and the other is diffusion oxidation. In the plasma?zone whose distance to the nozzle is less than 55 mm, convective oxidation is the dominating oxidation mechanism; in the zone whose distance to the nozzle is?more than 55 mm, diffusion oxidation is the principal mechanism. Besides the in-flight oxidation, the oxidation after spraying also occurs for the particles. In-flight oxidation is the main oxidation mechanism for NiCrCoAlY particles in plasma spraying. Shrouding gas can decrease the oxide content of in-flight oxidation and increase the oxidation resistance of NiCrCoAlY coatings

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魏 琪,張林偉,李 輝,崔 麗,栗卓新.等離子噴涂NiCrCoAlY涂層氧化控制研究[J].稀有金屬材料與工程,2010,39(12):2137~2141.[Wei Qi, Zhang Linwei, Li Hui, Cui Li, Li Zhuoxin. Oxidation Control of Plasma Sprayed NiCrCoAlY Coating[J]. Rare Metal Materials and Engineering,2010,39(12):2137~2141.]
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  • 收稿日期:2009-12-25
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