Abstract The strong scattering of the microstructures severely weakens light transmitted through the atmosphere-plasma-sprayed (APS) thermal barrier coating system (TBCs), which poses a great challenge to indicate APS TBCs delamination using optical inspection method. In this paper, to indicate the delamination in APS TBCs, an innovative method was proposed based on a luminescent sublayer that produces significantly greater emission intensity from delaminated regions of the TBCs. The top coat was prepared with a Eu3+-doped yttria-stabilized zirconia (YSZ:Eu3+) luminescent layer below an undoped YSZ layer. The delamination was prepared using a dissolved salt method. Specimens were vacuum-impregnated with mineral oil to improve the transparency of the coating, and thus to reduce the effects of pores and microcracks on luminescence signal. For specimens with a Eu3+-doped YSZ luminescent sublayer, luminescence intensity mapping showed excellent contrast between the delaminated region and the surrounding adherent region.

中文翻译：

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使用 Eu 3+ 发光映射的大气等离子体喷涂热障涂层系统的分层指示

摘要 微结构的强散射严重削弱了通过大气等离子体喷涂（APS）热障涂层系统（TBCs）的光，这对使用光学检测方法检测 APS TBCs 分层提出了巨大挑战。在本文中，为了表明 APS TBC 中的分层，提出了一种基于发光子层的创新方法，该方法从 TBC 的分层区域产生显着更大的发射强度。顶涂层是在未掺杂的 YSZ 层下方用 Eu3+ 掺杂的氧化钇稳定氧化锆 (YSZ:Eu3+) 发光层制备的。使用溶解盐法制备分层。样品用矿物油真空浸渍以提高涂层的透明度，从而减少孔隙和微裂纹对发光信号的影响。