Thickness and microstructure characterization of TGO in thermal barrier coatings by 3D reconstruction
- The State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, , Chinese Academy of Sciences, Shanghai 200050 (China)
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 (China)
- Key Laboratory of Inorganic Coating Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050 (China)
Yttria-stabilized zirconia (YSZ) thermal barrier coatings (TBCs) are prepared by plasma spraying. Thermally grown oxide (TGO) would be formed between YSZ topcoat and bond coat after 50 h thermal service for YSZ TBCs. The electron back scattered diffraction (EBSD) results reveal that the TGO layer is composed of α-Al{sub 2}O{sub 3} and cubic Al{sub 2}NiO{sub 4} layers. Measured values of TGO thickness from the 2D-SEM image are greater than or equal to its real thickness due to the fact that the TGO layer is much rolling so that up and down surfaces of the TGO can't be completely perpendicular to the cross-section direction confirmed by 3D-SEM. Furthermore, 3D-SEM results reveal that the real thickness of TGO layer is 3.10 μm instead of 7.1 μm. In addition, 3D-EBSD confirmed that α-Al{sub 2}O{sub 3} layer in TGO is composed of single layer of grains and Al{sub 2}NiO{sub 4} layer consist of multilayer of grains while α-Al{sub 2}O{sub 3} layer is mixed with single layer and multilayer of α-Al{sub 2}O{sub 3} grains from observation of the 2D-EBSD image. It provides a new method to characterize real thickness and microstructure of TGO, which is also applied to other film materials. - Highlights: •This work provides a new method to measure the real thickness of TGO. •YSZ TBCs were prepared by plasma spraying. •TGO is formed in TBCs by simulating thermal service at 1100 °C for 50 h. •Real thickness and microstructure of TGO were investigated by 3D reconstruction.
- OSTI ID:
- 22689635
- Journal Information:
- Materials Characterization, Journal Name: Materials Characterization Vol. 120; ISSN 1044-5803; ISSN MACHEX
- Country of Publication:
- United States
- Language:
- English
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