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Assessment of damage accumulation in thermal barrier coatings using a fluorescent dye infiltration technique

机译:使用荧光染料渗透技术评估隔热涂层中的损伤积累

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摘要

Thermal barrier coatings, used extensively on hot section gas turbine engine components, weaken and spall after repeated thermal exposure during normal engine operation. A new technique has been developed, involving the use of vacuum impregnationof the porous ceramic with a mixture of epoxy and fluorescent dye (rhodamine-B) and the ASTM C 633-79 direct pull test, to preserve and reveal incipient damage and accumulated damage prior to spallation in thermal barrier coatings. Excellent definition of damage is provided by the dye in electron beam physical vapor deposited coatings, but the damage is more difficult to distinguish in the highly porous plasma coatings. Image processing is used to quantify the area fraction of debonding. For the electronbeam physical vapor deposited yttria-stabilized zirconia coating evaluated, a local area fraction of debonding of up to 20% was observed at 80% of spallation life.
机译:隔热涂层广泛用于热区燃气轮机发动机部件,在发动机正常运行期间反复受到热暴露后,它们会减弱和剥落。已经开发出一种新技术,其中涉及将多孔陶瓷与环氧和荧光染料(若丹明-B)的混合物进行真空浸渍,以及ASTM C 633-79直接拉力测试,以保存并揭示初期损坏和累积损坏隔热涂层的剥落。在电子束物理气相沉积涂层中,染料提供了极好的损伤定义,但在高度多孔的等离子涂层中,这种损伤更难区分。图像处理用于量化脱胶的面积分数。对于评估的电子束物理气相沉积的氧化钇稳定的氧化锆涂层,在剥落寿命的80%时,观察到高达20%的脱胶局部面积。

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