Abstract
A plasma-sprayed 8% wt. Y 2O 3 partially stabilized ZrO 2 thermal barrier coating was doped with a certain amount of SiO 2. Adhesive strength, thermal shock lifetime, and hot corrosion resistance were used to evaluate performance of the SiO 2-doped coating, while microstructure, composition and cross-sectional morphologies of the doped coating were analyzed by transmission optical microscopy, electron microprobe analysis and scanning electron microscopy. The SiO 2-doped coating was also subjected to hot isostatic pressing (HIP) and laser remelting treatment to evaluate the quality of the coating. Results showed that the ZrO 2 coating doped with an appropriate amount of SiO 2 has liquid-sintering, thermal stress-releasing and self-closing properties. The 3% wt. SiO 2-doped ZrO 2 coating has high adhesive strength, superior thermal shock lifetime, and good hot corrosion resistance compared to commercial undoped coatings. Inserting a graded coating between the ceramic and the bond coat substantially improves the performance of the 3% wt. SiO 2-doped coating. Moreover, the 3% wt. SiO 2-doped ZrO 2 coating can be easily upgraded by HIP treatment or laser remelting.
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