Thermal Conductivity and Sintering Behavior of Advanced Thermal Barrier Coatings
Thermal Conductivity and Sintering Behavior of Advanced Thermal Barrier Coatings
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DOI：
10.1002/9780470294758.ch51
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发表时间：
2002-05
期刊：
影响因子：
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通讯作者：
Dongming Zhu;Robert Miller
中科院分区：
文献类型：
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作者：
Dongming Zhu;Robert Miller
先进的热障涂层显著降低了长期导热系数，目前正在开发一种方法，强调在温度和热通量方面与发动机类似的条件下实时监测导热系数。这与传统方法不同，传统方法首先根据炉子和燃烧器的耐用性对涂层进行优化，然后在加工或炉内烧结条件下进行测量。在NASA超高效发动机技术（UEET）项目下，目前的工作建立了一个激光高热流密度测试，作为评估先进等离子喷涂和物理气相沉积热障涂层的基础。该项目的候选涂层材料是新型热障涂层，由于采用了氧化物缺陷簇设计，其热导率显著降低。讨论了设计先进的低电导率涂层并提高涂层耐久性的关键问题。
Advanced thermal barrier coatings, having significantly reduced long-term thermal conductivities, are being developed using an approach that emphasizes real-time monitoring of thermal conductivity under conditions that are engine-like in terms of temperatures and heat fluxes. This is in contrast to the traditional approach where coatings are initially optimized in terms of furnace and burner rig durability with subsequent measurement in the as-processed or furnace-sintered condition. The present work establishes a laser high-heat-flux test as the basis for evaluating advanced plasma-sprayed and physical vapor-deposited thermal barrier coatings under the NASA Ultra Efficient Engine Technology (UEET) Program. The candidate coating materials for this program are novel thermal barrier coatings that are found to have significantly reduced thermal conductivities due to an oxide-defect-cluster design. Critical issues for designing advanced low conductivity coatings with improved coating durability are also discussed.