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首页> 外文期刊>Journal of Materials Research >In situ monitoring of cracking behaviors of plasma-sprayed coatings by the laser acoustic emission technique
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In situ monitoring of cracking behaviors of plasma-sprayed coatings by the laser acoustic emission technique

机译：激光声发射技术原位监测等离子喷涂涂层的开裂行为

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摘要

Multichannel acoustic emission (AE) measurements by four laser interferometers were developed and applied during a plasma-spray coating process that is known as being a high-temperature process and an extremely noisy environment in both mechanical and electrical domains. The AE signals could be successfully detected during the cooling period after the deposition, and it was clearly indicated that a higher preheating temperature resulted in the improvement of bonding between splats and/or at the interface of the coating and the substrate. The maximum principal stress generated during the deposition process was calculated by the transient heat and stress analysis and the obtained AE events. The critical stress for crack initiation of the alumina coating on a steel substrate with an NiCr bond coat layer was estimated as 30～45 MPa. The developed techniques were shown to be a potential tool for in situ monitoring of the thermal spray process, by which an increase in the reliability of thermal spray coatings can be expected.
机译：在等离子喷涂过程中开发并应用了由四个激光干涉仪进行的多通道声发射（AE）测量，该过程被称为高温过程，在机械和电气领域均处于非常嘈杂的环境中。可以在沉积后的冷却期间成功检测到AE信号，并且清楚地表明，较高的预热温度可改善splat之间和/或涂层与基材界面之间的结合。通过瞬态热和应力分析以及获得的AE事件，计算出沉积过程中产生的最大主应力。据估计，在具有NiCr粘结涂层的钢基材上氧化铝涂层裂纹萌生的临界应力为30〜45 MPa。所开发的技术被证明是用于热喷涂过程原位监测的潜在工具，通过它可以期望提高热喷涂涂层的可靠性。

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  • 来源
    《Journal of Materials Research》 |2009年第10期|3182-3189|共8页
  • 作者

    Koichi Taniguchi; Manabu Enoki; Makoto Watanabe; Seiji Kuroda; Kaita Ito;

  • 作者单位

    Department of Materials Engineering, The University of Tokyo, Tokyo 153-8902, Japan;

    Department of Materials Engineering, The University of Tokyo, Tokyo 153-8902, Japan;

    Hybrid Materials Center, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan;

    Hybrid Materials Center, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan;

    Department of Materials Engineering, The University of Tokyo, Tokyo 153-8902, Japan and Innovative Materials Engineering Library, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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