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首页> 外文期刊>Journal of thermal analysis and calorimetry >Thermal diffusivity measurement of ceramic materials used in spraying of TBC systems The influence of materials' morphology and (re)manufacturing processes
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Thermal diffusivity measurement of ceramic materials used in spraying of TBC systems The influence of materials' morphology and (re)manufacturing processes

机译：用于喷射TBC系统的陶瓷材料的热扩散测量材料物质形态和（RE）制造过程的影响

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The basic goal of this article was thermal diffusivity characterization of ceramic materials used in thermal barrier coating (TBC) systems for depositions of the insulation layer and characterization of the materials' morphology and remanufacturing process. The base material was oxide 8YSZ (ZrO2 x 8Y(2)O(3)), which is usually dedicated to deposition of an insulating top layer in TBC systems. The data related to thermal properties such as thermal diffusivity and thermal conductivity are widely presented in the literature, but there is lack of information about the morphological form of investigated materials, and the presented results vary widely. Data on thermal properties based on the literature sources are inadequate for the real morphological form of materials used in the experiment (e.g., massive or single crystalline material vs. plasma-sprayed coatings), which consequently gives an unsatisfactory accuracy of the obtained numerical simulations by MES methods. This article presents the characterization of thermal diffusivity of the commercial 8YSZ ceramic material synthesized or remanufactured by different routes, which is investigated in the forms of pressed powder pellet (two commercial nano-sized powders with different morphologies), sintered pellets (one commercial powder, solid-state co-precipitated reacted powder of 8YSZ type), and a two-layered coating system of In625 + NiCrAlY/8YSZ type. The range of analysis included morphological investigations of different types of powders in initial conditions and after remanufacturing (sintering, thermal spraying) as well as the thermal diffusivity analysis by the laser flash method. The obtained data were corrected by porosity factor and compared to each other. The best similarity for obtained thermal diffusivity data was found for commercial powers of HOSPTM type after pressing and sintering processes and calculated (2-layered model) value of thermal diffusivity for two-layered system of In625/8YSZ TBS system. The results showed that there are significant differences in thermal diffusivity values for materials with different morphological forms.
机译：本文的基本目的是热屏障涂层（TBC）系统中使用的陶瓷材料的热扩散性，用于沉积绝缘层和材料形态的表征和再制造过程。基础材料是氧化物8倍（ZrO2 x 8Y（2）O（3）），其通常专用于在TBC系统中沉积绝缘顶层。文献中广泛地呈现与热漫射和导热率的热性质相关的数据，但是缺乏关于研究材料形态形式的信息，并且所呈现的结果差异很大。基于文献来源的热性能数据对于实验中使用的实际材料的实际形态形式（例如，大规模或单晶材料与等离子体喷涂涂层）的实际形态形式不足。因此，所产生的数值模拟的令人不令人满意的准确性MES方法。本文介绍了由不同途径合成或再制备的商业8苏斯陶瓷材料的热扩散率的表征，这些途径以压制粉末颗粒（两种具有不同形态）的两种商业纳米型粉末，烧结颗粒（一种商业粉末，固态共沉淀的8倍型的共沉淀反应粉末，以及IN625 + NiCraly / 8YSZ型的双层涂层系统。分析范围包括初始条件下不同类型的粉末的形态调查和再制造（烧结，热喷涂）以及激光闪光法的热扩散性分析。通过孔隙因子并彼此相比校正所获得的数据。在按压和烧结过程之后，找到了获得热扩散性数据的最佳相似性，并计算了IN625 / 8YSZ TBS系统的两层系统的热扩散率的（2层模型）值。结果表明，具有不同形态形式的材料的热扩散值存在显着差异。

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