| SONG Shan-guang,WANG Wei,TAN Shi-lei,WANG Li-li.Effect of rare earth doped Gd2O3 on Microstructure and properties of YSZ/(Ni, Al) composite coatings[J],45(3):109-114 |
| Effect of rare earth doped Gd2O3 on Microstructure and properties of YSZ/(Ni, Al) composite coatings |
| Received:October 06, 2015 Revised:March 20, 2016 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2016.03.018 |
| KeyWord:Thermal barrier coating Electrophoretic deposition Oxidation resistance Adhesion strength Gd2O3 Rare earth doped |
| Author | Institution |
| SONG Shan-guang |
College of Materials Engineering,Shanghai University of Engineering Science, Shanghai , China |
| WANG Wei |
College of Materials Engineering,Shanghai University of Engineering Science, Shanghai , China |
| TAN Shi-lei |
College of Materials Engineering,Shanghai University of Engineering Science, Shanghai , China |
| WANG Li-li |
College of Materials Engineering,Shanghai University of Engineering Science, Shanghai , China |
|
| Hits: |
| Download times: |
| Abstract: |
| Objective To improve the oxidation resistanceand adhesion strength of YSZ/(Ni, Al) composite coatings. Methods YSZ/ (Ni, Al) composite coatings were deposited on Inconel 600 superalloy with rare earth doped Gd2O3（G-YSZ/(Al,Ni)) and without rare earth doped using the electrophoretic deposition (EPD) technique, followed by vacuum sintering method. Then the preparation of thermal barrier composite coatings were test by the scratches and the cycle of isothermal oxidation experiments. By Isothermal oxidation experiment, composite coatings samples of different oxidation period were obtained and by means of SEM and XRD analysis on the microstructure and morphology of the composite coatings. Results In the process of isothermal oxidation in air at 1100℃, YSZ/ (Ni, Al) composite coatings and rare earth doped coated samples have a rate of weight gain about
0.0057mg/mm2 and 0.0049mg/mm2, respectively. The rate of rare earth doped coated samples is smaller than the YSZ/ (Ni, Al) composite coatings without rare earth doped. G-YSZ/(Al,Ni) composite coatings have a little of growth of grain and the surface of the coating is more dense and crack-less. After vacuum sintering for 2h, the adhesion strength of G-YSZ/(Al,Ni) and YSZ/ (Ni, Al) were both about 4.0N, the adhesion strength of G-YSZ/(Al,Ni) and YSZ/ (Ni, Al) after isothermal oxidation in air at 1100℃ for 100 h, were 3.5N and 2.6N, respectively. G-YSZ/(Ni, Al) composite coatings exist Gd2Zr2O7 and stable NiAl2O4 phases by XRD analysis, and Gd2Zr2O7 phase has a good stability and resistance to high temperature oxidation. Conclusion G-YSZ/(Al,Ni) composite coatings significantly improve the oxidation resistance during isothermal oxidation in air at 1100℃. In the process of isothermal oxidation, the particles of doped with rare earth G-YSZ/(Al, Ni) composite coating tend to be homogenization and the crack obviously become small obviously, making the surface of coating more dense and smooth. After isothermal oxidation in air at 1100℃, G - YSZ/(Al, Ni) composite coating has a better adhesion strength between substrate, the spalling resistance and service life is better. |
| Close |
|
|
|