Abstract
Air plasma sprayed thermal barrier coatings(TBCs) with double-layer structure was investigated, and the experiment of constant temperature oxidization was performed at 1050°C The microstructure and high temperature oxidation behaviors of thermal barrier coatings were investigated with scanning electron micro-scope(SEM), energy-dispersive X-ray spectroscopy(EDS) and high resolution nano-CT. The results show that the bond coat is oxidized when the air plasma sprayed thermal barrier coatings after 12 hours of high temperature oxidation, and a layer of uneven thickness of thermally grown oxide(TGO) has grown between ceramic topcoat and bond coat, and the average thickness of TGO is 1.979µm by SEM. The three-dimensional structure images of the coatings are obtained by nano-CT, the internal microstructure and morphology of TGO are displayed, and the measured average thickness of TGO is 1.991µm. The results of nano-CT analysis are consistent with the results of scanning electron microscopy(SEM).
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