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首页> 外文期刊>Heat Transfer Engineering >Reusable Thermal History Sensing via Oxidation of a Divalent Rare Earth Ion-Based Phosphor Synthesized by the Sol-Gel Process
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Reusable Thermal History Sensing via Oxidation of a Divalent Rare Earth Ion-Based Phosphor Synthesized by the Sol-Gel Process

机译：通过溶胶-凝胶法合成的二价稀土离子基荧光粉的氧化可重复使用的热历史感测

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摘要

Temperature measurements in harsh environments, such as those present in gas turbines, are of great importance but very hard to obtain. Sometimes, on-line measurements are not possible, and instead, the temperatures during operation are recorded using so-called thermal history sensors and read off-line. Although thermal paints have been used for many years as thermal history sensors, they present some disadvantages. Recently, a new method based on irreversible changes in the emission properties of phosphor materials when they are exposed to high temperatures has been proposed. It has been demonstrated that the process of oxidation from Eu~(2+) to Eu~(3+) is temperature sensitive up to 1400℃. In this paper, we describe the manufacture of BaMgAl_(10)O_(17):Eu (BAM:Eu) using a sol-gel process, and report optical properties interrogated after heat treatments in air and argon atmospheres, which confirm that after treatment in argon, the oxidation process can be reversed. This suggests a promising reusability of the phosphor as a thermal history sensor. A temperature-dependent measurand based on the change of optical properties with temperature has been defined with a dynamic range from 700℃ to 1100℃. The effect of exposure time to a certain temperature on this measurand has also been addressed.
机译：在恶劣环境下（例如燃气轮机中存在的环境）中的温度测量非常重要，但很难获得。有时无法进行在线测量，而是使用所谓的热历史传感器记录运行期间的温度并离线读取。尽管热敏涂料已被用作热历史传感器多年，但它们仍存在一些缺点。近来，已经提出了一种新的方法，其基于磷光体材料暴露于高温时的发射特性的不可逆变化。结果表明，Eu〜（2+）氧化为Eu〜（3+）的过程对温度的敏感度高达1400℃。在本文中，我们描述了使用溶胶-凝胶工艺制造BaMgAl_（10）O_（17）：Eu（BAM：Eu）的方法，并报告了在空气和氩气气氛中热处理后受到质疑的光学性能，这证实了处理后在氩气中，氧化过程可以逆转。这表明磷光体作为热历史传感器具有良好的可重用性。根据光学性质随温度的变化，定义了温度相关的被测量物，其动态范围为700℃至1100℃。还已经解决了暴露于一定温度下的时间对此被测物的影响。

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  • 来源
    《Heat Transfer Engineering》 |2015年第15期|1275-1281|共7页
  • 作者

    ALVARO YANEZ GONZALEZ; STEPHEN SKINNER; FRANK BEYRAU; ANDREW L. HEYES;

  • 作者单位

    Department of Mechanical Engineering, Imperial College London, London, United Kingdom;

    Department of Materials, Imperial College London, London, United Kingdom;

    Department of Mechanical Engineering, Imperial College London, London, United Kingdom;

    Energy Technology and Innovation Initiative, University of Leeds, Leeds, LS2 9JT, United Kingdom;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
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