Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8013195 | Materials Letters | 2018 | 4 Pages |
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.
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Chunling Li, Xueling Fan, Peng Jiang, Xiaochao Jin,