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首页> 外文期刊>Journal of the American Ceramic Society >Determination of Scattering and Absorption Coefficients for Plasma-Sprayed Yttria-Stabilized Zirconia Thermal Barrier Coatings at Elevated Temperatures
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Determination of Scattering and Absorption Coefficients for Plasma-Sprayed Yttria-Stabilized Zirconia Thermal Barrier Coatings at Elevated Temperatures

机译：高温下等离子喷涂的氧化钇稳定的氧化锆热障涂层的散射和吸收系数的测定

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摘要

The temperature dependence of the scattering and absorption coefficients for a set of freestanding plasma-sprayed 8 wt% yttria-stabilized zirconia (8YSZ) thermal barrier coatings (TBCs) was determined at temperatures up to 1360℃ in a wavelength range from 1.2 μm up to the 8YSZ absorption edge. The scattering and absorption coefficients were determined by fitting the directional-hemispherical reflectance and trans-mittance values calculated by a four-flux Kubelka-Munk method to the experimentally measured hemispherical-directional reflectance and transmittance values obtained for five 8YSZ thicknesses. The scattering coefficient exhibited a continuous decrease with increasing wavelength and showed no significant temperature dependence. The scattering is primarily attributed to the relatively temperature-insensitive refractive index mismatch between the 8YSZ and its internal voids. The absorption coefficient was very low (<1 cm~(-1)) at wavelengths between 2 μm and the absorption edge and showed a definite temperature dependence that consisted of a shift of the absorption edge to shorter wavelengths and an increase in the weak absorption below the absorption edge with increasing temperature. The shift in the absorption edge with temperature is attributed to strongly temperature-dependent multiphonon absorption. While TBC hemispherical transmittance beyond the absorption edge can be predicted by a simple exponential decrease with thickness, below the absorption edge, typical TBC thicknesses are well below the thickness range where a simple exponential decrease in hemispherical transmittance with TBC thickness is expected. [Correction added after online publication August 11, 2009: "edge to a shorter wavelengths" has been updated as "edge to shorter wavelengths."]
机译：确定了一组独立的等离子喷涂的8 wt％的氧化钇稳定的氧化锆（8YSZ）热障涂层（TBC）的散射和吸收系数的温度依赖性，该温度范围高达1360℃，波长范围为1.2μm至8YSZ吸收边缘。通过将通过四通量Kubelka-Munk方法计算出的方向半球反射率和透射率值与针对五个8YSZ厚度获得的实验测量的半球方向反射率和透射率值进行拟合，可以确定散射系数和吸收系数。散射系数随着波长的增加呈现出连续降低的趋势，并且没有明显的温度依赖性。散射主要归因于8YSZ及其内部空隙之间相对温度不敏感的折射率失配。在2μm和吸收边缘之间的波长处，吸收系数非常低（<1 cm〜（-1）），并且表现出确定的温度依赖性，包括吸收边缘向较短波长的偏移以及弱吸收的增加随温度升高而低于吸收边缘。吸收边缘随温度的变化归因于强烈依赖温度的多声子吸收。虽然可以通过厚度随厚度的简单指数下降来预测超出吸收边缘的TBC半球透射率，但在吸收边缘以下，典型的TBC厚度却远低于预期的半球透射率随TBC厚度简单指数下降的厚度范围。 [在在线发布于2009年8月11日之后添加的更正：“短波长边缘”已更新为“短波长边缘”。]

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  • 来源
    《Journal of the American Ceramic Society》 |2009年第10期|2276-2285|共10页
  • 作者

    Jeffrey I. Eldridge; Charles M. Spuckler; James R. Markham;

  • 作者单位

    NASA Glenn Research Center, Cleveland, Ohio 44135;

    NASA Glenn Research Center, Cleveland, Ohio 44135;

    Advanced Fuel Research Inc., East Hartford, Connecticut 06108;

  • 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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