| SONG Shan-guang,WANG Wei,TAN Shi-lei,WANG Li-li.Effect of Rare Earth Doped with Nd2O3 on Microstructure and Properties of YSZ/(Ni, Al) Composite Coatings[J],45(10):49-55 |
| Effect of Rare Earth Doped with Nd2O3 on Microstructure and Properties of YSZ/(Ni, Al) Composite Coatings |
| Received:March 26, 2016 Revised:October 20, 2016 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2016.10.008 |
| KeyWord:oxidation resistance adhesion strength Nd2O3 doped with rare earth self-healing thermal barrier coating |
| Author | Institution |
| SONG Shan-guang |
School of Materials Engineering, Shanghai University of Engineering Science, Shanghai , China |
| WANG Wei |
School of Materials Engineering, Shanghai University of Engineering Science, Shanghai , China |
| TAN Shi-lei |
School of Materials Engineering, Shanghai University of Engineering Science, Shanghai , China |
| WANG Li-li |
School of Materials Engineering, Shanghai University of Engineering Science, Shanghai , China |
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| Abstract: |
| The work aims to improve the adhesion strength and high temperature oxidation resistance of YSZ/(Al, Ni) composite coatings. YSZ/(Al, Ni) composite coatings were deposited on Inconel600 superalloy doped with rare earth Nd2O3-YSZ/(Al,Ni) (N-YSZ/(Al,Ni)) composite coatings with the electrophoretic deposition (EPD) technique, followed by vacuum sintering. Finally, the well-prepared thermal barrier composite coatings received the wounding healing tests and the isothermal cycling oxidation experiments. Through isothermal cycling oxidation experiments on the samples, composite coating samples in different oxidation periods were obtained and the morphology and microstructure of the composite coatings were respectively analyzed by means of SEM and XRD. In the process of isothermal oxidation at 1,100 ℃, the oxidation weight increase velocity of the composite coatings non-doped with the rare earth element and that of the composite coatings doped with neodymium were respectively 0.0057 mg/cm2 and 0.0046 mg/cm2. The latter oxidation weight increase velocity was lower than that non-doped with the composite coatings of rare earth YSZ/(Al, Ni). The grains of N-YSZ/(Al, Ni) thermal barrier composite coatings were small and had less cracks, with denser surface in the process of isothermal oxidation, during which the self-healing occurred. After vacuum sintering, the adhesion strength of YSZ/(Al, Ni) and N-YSZ/(Al, Ni) composite coatings with the matrix was about 4.0 N. After oxidation for 100 h, the adhesion strength of N-YSZ/(Al,Ni) composite coatings doped with rare earth and the adhesion strength of YSZ/(Al, Ni) composite coatings non-doped with rare earth neodymium with the matrix were respectively 3.26 N and 2.6 N. N-YSZ/(Al, Ni) thermal barrier composite coatings had Nd2Zr2O7 and stable Ni- Al2O4 phases, and Nd2Zr2O7 phase had a good stability and high temperature oxidation-resistance. Self-healing phenomenon occurred when N-YSZ/(Al,Ni) composite coatings doped with the rare earth neodymium oxide in the process of isothermal oxidation in air at 1,100 ℃. With the increase of oxidation time, the particles on the N-YSZ/(Al, Ni) composite coatings doped with rare earth element neodymium tend to be homogenized, apparently with less cracks, which enable the coatings to be denser and smoother. The adhesion strength between N-YSZ/(Al,Ni) composite coatings doped with rare earth element neodymium and the matrix is higher. In the process of isothermal oxidation in air at 1,100 ℃, the adhesion strength between the N-YSZ/(Al,Ni) composite coatings doped with the rare earth element neodymium and the matrix is significantly larger than that of the YSZ/(Al,Ni) composite coatings, which improves the spalling resistance and service life of the N-YSZ/(Al,Ni) composite coatings. In the process of isothermal oxidation in air at 1,100 ℃, compared with YSZ/(Al,Ni) composite coatings non-doped with rare earth element, N-YSZ/(Al,Ni) composite coatings doped with earth element neodymium more significantly improves the oxidation resistance. |
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