Investigations on the Initial Stress Evolution During Atmospheric Plasma Spraying of YSZ by In Situ Curvature Measurement
Investigations on the Initial Stress Evolution During Atmospheric Plasma Spraying of YSZ by In Situ Curvature Measurement
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DOI：
10.1007/s11666-016-0398-4
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发表时间：
2016-03
影响因子：
3.1
通讯作者：
M. Mutter;G. Mauer;R. Mücke;R. Vaßen;H. C. Back;J. Gibmeier
中科院分区：
文献类型：
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作者：
M. Mutter;G. Mauer;R. Mücke;R. Vaßen;H. C. Back;J. Gibmeier
等离子喷涂涂层内的残余应力是影响涂层寿命和使用性能的重要因素。大气等离子喷涂氧化钇稳定氧化锆涂层的沉积和沉积后冷却过程中的应力演变的调查，使用原位测量的样品曲率是一个强大的工具，用于识别的因素，有助于应力的产生。在各种喷涂条件下，第一次沉积通过导致样品曲率比后续通过显著更大的增加。它示出在这项工作中，在喷射的开始时的曲率变化的量是显着影响的喷射条件，以及由基板材料。更多的信息，这种陡峭的曲率增加的起源在喷涂开始时，通过单飞溅实验，在各种条件下产生的飞溅粘结行为的信息。不同基体材料的压缩屈服强度的比较表明基体残余应力松弛的影响。使用增量钻孔方法和X射线衍射的残余应力测量证实，涂层沉积影响基板的残余应力水平。屈服强度数据与沉积过程中的衬底近表面温度相结合，通过有限元模拟获得，并与测得的残余应力分布。这表明残余应力松弛是初始曲率增加的关键因素。
The residual stresses within plasma-sprayed coatings are an important factor that can influence the lifetime as well as the performance in operation. The investigation of stresses evolving during deposition and post-deposition cooling for atmospheric plasma spraying of yttria-stabilized zirconia coatings using in situ measurement of the samples curvature is a powerful tool for identifying the factors that contribute to stress generation. Under various spray conditions, the first deposition pass leads to a significantly larger increase in samples curvature than the subsequent passes. It is shown in this work that the amount of curvature change at the onset of spraying is significantly influenced by the spray conditions, as well as by the substrate material. More information on the origin of this steep curvature increase at the onset of spraying was obtained by single splat experiments, which yielded information on the splat bonding behavior under various conditions. A comparison of the compressive yield strength for different substrate materials indicated the influence of substrate residual stress relaxation. Residual stress measurements using the incremental hole-drilling method and x-ray diffraction confirmed that the coating deposition affects the substrate residual stress level. The yield strength data were combined with the substrate near-surface temperature during deposition, obtained by finite element simulations, and with the measured residual stress-profile. This revealed that residual stress relaxation is the key factor for the initial curvature increase.