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Characterization of laser sealed coatings of yttria partially stabilized zirconia

机译：氧化钇部分稳定的氧化锆的激光密封涂层的表征

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摘要

The present paper reports an experimental investigation based on X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), and wavelength dispersive spectroscopy (WDS) analyses of phases formed after laser sealing of plasma sprayed coatings of 8.5 wt% yttria partially stabilized zirconia (YPSZ). X-ray diffraction and X-ray step-scanning analyses showed that the plasma sprayed and sealed coatings consisted mainly of t' phase with a very small amount of monoclinic phase (m phase) in the plasma sprayed coatings. It was also found that the small amounts of m and cubic phases (c phase) present in the sealed coatings were dependent on laser processing specific energies (specific energy is equal to laser power/traverse speed x beam diameter). It was also found that rhombohedral (r) phase formed after laser sealing of coatings at higher specific energies. A direct relationship between cja ratio of transformable tetragonal phase (t phase) produced by thermal treatment of sealed coatings and nontransformable tetragonal phase (t' phase) and the amount of Yttria was obtained. A new equation was derived, which describes the relationship between Yttria concentration and the c/a ratio of tetragonal phases (t or t').
机译：本文报告了基于X射线衍射（XRD），能量色散光谱（EDS）和波长色散光谱（WDS）分析的实验研究，该分析是对8.5 wt％氧化钇部分稳定的氧化锆的等离子喷涂涂层进行激光密封后形成的相的分析。 （YPSZ）。 X射线衍射和X射线步进扫描分析表明，等离子喷涂和密封的涂层主要由t'相组成，等离子喷涂涂层中的单斜相（m相）非常少。还发现密封涂层中存在的少量m相和立方相（c相）取决于激光加工的比能（比能等于激光功率/横移速度x光束直径）。还发现菱形（r）相在较高比能下激光密封涂层后形成。获得了通过密封涂层的热处理产生的可变形四方相（t相）和不可变形四方相（t'相）的cja比与氧化钇量的直接关系。导出了一个新的方程，该方程描述了氧化钇浓度与四方相（t或t'）的c / a比之间的关系。

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