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Laser texturing at interface for improved strain tolerance and thermal insulation performance of thermal barrier coatings.
- Source :
-
Surface & Coatings Technology . Apr2023, Vol. 459, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- Titanium alloys have become indispensable materials for lightweight and high-thrust-to-weight-ratio aeroengines owing to their low densities and high specific strengths. However, as the thrust-to-weight ratio increases, the temperature in an aeroengine increases to values considerably above the service temperature of the titanium alloy. Effective design and preparation of the interface structure are a potential approach to enhance the service life and dependability of thermal barrier coatings (TBCs). In this study, TBCs were prepared by spark plasma sintering (SPS) on Ti-6Al-4V, and a texture was engraved at the bond coating (BC)/top coating (TC) interface by a fibre laser. The laser texturing induced segmentation cracks. High-density segmentation cracks (dense vertical cracks (DVCs)) could be formed at densely spaced areas of the texturing. Based on the bimodal structure characteristic obtained by SPS, bimodal-structured DVC TBCs were realised, which provided the coating with higher strain tolerance and thermal insulation performance. After 138 cycles of thermal shock at 800 °C, the spallation area of a 2-mm square coating was only 34.55 % of that of unengraved TBCs. In addition, the laser-textured coating had a better thermal insulation performance. The thermal insulation temperature of a hexagonal 2-mm coating reached 215 °C. [Display omitted] • Induced segmentation cracks in thermal barrier coatings by laser texturing • Thermal barrier coatings with density segmentation cracks and bimodal structures were realised • Laser texturing at the interface gave the better thermal insulation performance [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02578972
- Volume :
- 459
- Database :
- Academic Search Index
- Journal :
- Surface & Coatings Technology
- Publication Type :
- Academic Journal
- Accession number :
- 162593491
- Full Text :
- https://doi.org/10.1016/j.surfcoat.2023.129385