| LI Jia,XIE Zheng,HE Jing,ZOU Han,LYU Yu-fen.Thermophysical Properties of Gd2O3-Yb2O3-Y2O3-ZrO2 Thermal Barrier Coating Material[J],44(9):18-22,42 |
| Thermophysical Properties of Gd2O3-Yb2O3-Y2O3-ZrO2 Thermal Barrier Coating Material |
| Received:June 16, 2015 Revised:September 20, 2015 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2015.09.004 |
| KeyWord:thermal barrier coating rare earth oxides doping modification zirconia thermophysical properties high temperature phase stability |
| Author | Institution |
| LI Jia |
1. Chinese Academy of Agricultural Mechanization Sciences, Beijing , China;2. Beijing Golden Wheel Special Machine Co. , Ltd, Beijing , China |
| XIE Zheng |
1. Chinese Academy of Agricultural Mechanization Sciences, Beijing , China;2. Beijing Golden Wheel Special Machine Co. , Ltd, Beijing , China |
| HE Jing |
1. Chinese Academy of Agricultural Mechanization Sciences, Beijing , China;2. Beijing Golden Wheel Special Machine Co. , Ltd, Beijing , China |
| ZOU Han |
1. Chinese Academy of Agricultural Mechanization Sciences, Beijing , China;2. Beijing Golden Wheel Special Machine Co. , Ltd, Beijing , China |
| LYU Yu-fen |
1. Chinese Academy of Agricultural Mechanization Sciences, Beijing , China;2. Beijing Golden Wheel Special Machine Co. , Ltd, Beijing , China |
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| Abstract: |
| Objective To improve the performance of traditional ceramic thermal barrier coatings by rare earth oxides doping yttria stabilized zirconia (YSZ). Methods The Gd2O3-Yb2O3-Y2O3-ZrO2(GYYZO) materials with various doped contents were prepared by co-precipitation, and the GYYZO bulk materials and coatings were prepared by cold isostatic pressing (CIP) and plasma spraying(PS), respectively. The thermal conductivity and thermal expansion coefficient tests of materials with different compositions were taken to analyze and evaluate the thermophysical properties of GYYZO materials. X-ray diffraction (XRD) analysis of the coatings was conducted after high-temperature annealing treatment to evaluate the high temperature stability of coatings with different compositions. Results The thermal conductivities and coefficient of thermal expansion (CTEs) of zirconia based bulk materials decreased with the increasing doped content. The thermal conductivity of bulk GYYZO doped with 5. 5% ~9. 84% mole fraction of rare earth oxides at 1000 ℃ was 1. 25 ~1. 56 W/ (m·K), which was reduced by 22% ~37. 5% as compared with that of bulk 8YSZ, and the CTEs was (10 ~ 11. 1) ×10 -6 / K, which was closed to that of the tradition 8YSZ materials. After long-term heat treatment at 1400 ℃ , the content of monoclinic phase for GYYZO coating with low doped content was obviously lower than that of 8YSZ coating. Conclusion The multiple rare earth oxides doped YSZ has good high temperature phase stability, low thermal conductivity and suitable thermal expansion coefficient, and can be used as candidate ceramic materials for high-performance thermal barrier coatings. |
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