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首页> 外文会议>IET amp; ISA 60th International Instrumentation Symposium >Sol-gel deposited thermographic phosphors as possible thermal history coatings
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Sol-gel deposited thermographic phosphors as possible thermal history coatings

机译：溶胶凝胶沉积的热成像磷光体可能是热历史涂层

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摘要

In many engineering applications surface temperatures have to be measured accurately. Sometimes the maximum temperature reached by a surface within its lifetime is even more important than its actual temperature. In order to obtain information about such maximum temperatures, so called temperature history sensors can be applied. One idea to obtain such information, which is followed in the actual work, is to deposit doped oxides with phosphorescence properties which are depending on the crystal structure of the host oxide. Thus, if the crystal structure is changing at a certain temperature, this change could also be detected by a simple phosphorescence lifetime measurement afterwards. In the present work, two materials were investigated. Yttria doped with terbium and europium and alumina doped with europium. Both materials were deposited as thin films with the sol gel technique using a newly developed automated spray coating set-up. The samples were heated twice: once for calcination at a given temperature and then a second time by annealing them at different temperatures. After each of the two treatments the phosphorescence lifetimes were investigated. The first procedure is intrinsic for the production of phosphorescing material. The second annealing simulates the high temperature treatment within an application. It is found that the phosphorescence lifetime is changed in most cases, when the second annealing temperature is higher than the first calcination temperature. Thus, a certain design or alignment of the detected maximum temperature is possible. For the doped yttria, the lifetimes increase by ca. 20% after the second treatment at higher temperatures, while for doped alumina a reduction of the lifetimes by more than 50% is observed. In total this may be a promising way for obtaining adjustable temperature history sensors.
机译：在许多工程应用中，必须精确测量表面温度。有时，表面在其生命周期内达到的最高温度甚至比其实际温度还要重要。为了获得有关这种最高温度的信息，可以应用所谓的温度历史传感器。在实际工作中遵循的获得这种信息的一个想法是沉积具有磷光性质的掺杂氧化物，磷光性质取决于主体氧化物的晶体结构。因此，如果晶体结构在一定温度下发生变化，则该变化也可以通过随后的简单磷光寿命测量来检测。在目前的工作中，研究了两种材料。氧化钇掺杂了ter和euro，氧化铝掺杂了euro。两种材料均采用溶胶凝胶技术，使用新开发的自动喷涂装置以薄膜形式沉积。将样品加热两次：一次在给定温度下煅烧，然后第二次在不同温度下退火。在两种处理中的每一种之后，研究了磷光寿命。第一个步骤是生产磷光材料的固有步骤。第二次退火模拟了应用程序中的高温处理。发现在大多数情况下，当第二退火温度高于第一煅烧温度时，磷光寿命改变。因此，检测到的最高温度的特定设计或对准是可能的。对于掺杂的氧化钇，寿命增加了约。在较高温度下进行第二次处理后达到20％，而对于掺杂氧化铝，观察到寿命降低了50％以上。总之，这可能是获得可调温度历史传感器的有前途的方法。

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