Evolution of hot corrosion resistance of YSZ,Gd2Zr2O7, and Gd2Zr2O7 + YSZ composite thermal barrier coatings in Na2SO4 + V2O5 at 1050 °C |
| |
| Authors: | MH Habibi Li Wang SM Guo |
| |
| Affiliation: | 1. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Beijing Institute of Aeronautical Materials, Department 5, Beijing 100095, China;1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;2. National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan;3. State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;1. School of Metallurgy and Environment, Central South University, Changsha 410083, PR China;2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, PR China |
| |
| Abstract: | This paper compares the hot corrosion performance of yttria stabilized zirconia (YSZ), Gd2Zr2O7, and YSZ + Gd2Zr2O7 composite coatings in the presence of molten mixture of Na2SO4 + V2O5 at 1050 °C. These YSZ and rare earth zirconate coatings were prepared by atmospheric plasma spray (APS). Chemical interaction is found to be the major corrosive mechanism for the deterioration of these coatings. Characterizations using X-ray diffraction (XRD) and scanning electron microscope (SEM) indicate that in the case of YSZ, the reaction between NaVO3 and Y2O3 produces YVO4 and leads to the transformation of tetragonal ZrO2 to monoclinic ZrO2. For the Gd2Zr2O7 + YSZ composite coating, by the formation of GdVO4, the amount of YVO4 formed on the YSZ + Gd2Zr2O7 composite coating is significantly reduced. Molten salt also reacts with Gd2Zr2O7 to form GdVO4. Under a temperature of 1050 °C, Gd2Zr2O7 based coatings are more stable, both thermally and chemically, than YSZ, and exhibit a better hot corrosion resistance. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
