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首页> 外文期刊>Applied Surface Science >Oxidation control in plasma spraying NiCrCoAlY coating
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Oxidation control in plasma spraying NiCrCoAlY coating

机译：等离子喷涂NiCrCoAlY涂层的氧化控制

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摘要

Atmospheric plasma spraying is usually accompanied by oxidation reactions, which result in the formation of oxides in the coatings. The presence of oxides in metallic coatings is usually undesirable because they cause the coating properties to deteriorate. This study highlights how the high temperature oxidation resistance of plasma sprayed NiCrCoAlY coating is influenced by both the oxidation behavior of NiCrCoAlY particles and by the shrouding gas during the spray process. It is shown that two different oxidation mechanisms are involved in the in-flight oxidation. One is diffusion oxidation, and the other is convective oxidation. The convective oxidation of NiCrCoAlY particles is the dominating oxidation mechanism when the plasma jet is at a distance of 55 mm from the torch nozzle exit; while diffusion oxidation was found to be the dominant mechanism when the spray distance is greater than 55 mm. Oxidation mainly occurs during in-flight and after impact on the substrate. In-flight oxidation is the dominant mechanism for NiCrCoAlY particles in plasma spray. Adding inert-gas shrouding is an effective method for decreasing the oxide content of the NiCrCoAlY coating, which significantly increases the coating's oxidation resistance.
机译：大气等离子喷涂通常会伴随氧化反应，这会导致涂层中形成氧化物。金属涂层中氧化物的存在通常是不希望的，因为它们会导致涂层性能下降。这项研究强调了等离子喷涂NiCrCoAlY涂层的高温抗氧化性如何受NiCrCoAlY颗粒的氧化行为和喷涂过程中的覆盖气体的影响。结果表明，飞行中的氧化涉及两种不同的氧化机理。一种是扩散氧化，另一种是对流氧化。当等离子射流距离割炬喷嘴出口55毫米时，NiCrCoAlY颗粒的对流氧化是主要的氧化机理。当喷雾距离大于55 mm时，扩散氧化是主要机理。氧化主要发生在飞行过程中和撞击基材后。飞行中氧化是等离子喷涂中NiCrCoAlY颗粒的主要机理。添加惰性气体保护层是降低NiCrCoAlY涂层的氧化物含量的有效方法，这可以显着提高涂层的抗氧化性。

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  • 来源
    《Applied Surface Science》 |2012年第12期|p.5094-5099|共6页
  • 作者

    Qi Wei; Zhiyong Yin; Hui Li;

  • 作者单位

    The College of Materials Science and Engineering, Beijing University of Technology, 100 PingLeYuan, Beijing 100124, PR China;

    The College of Materials Science and Engineering, Beijing University of Technology, 100 PingLeYuan, Beijing 100124, PR China;

    The College of Materials Science and Engineering, Beijing University of Technology, 100 PingLeYuan, Beijing 100124, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    plasma spray; convective oxidation; diffusible oxidation; oxidation resistance;

    机译：等离子喷涂对流氧化;扩散氧化抗氧化性;

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