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598 results on '"Cui, Xiufang"'

104. Effect of Gd2O3 Addition on High-Temperature Oxidation Performance of NiCoCrAlYTa Coatings.

Author

Liu, Anying, Cui, Xiufang, Jing, Yongzhi, Chen, Zhuo, Zhang, Zhijia, Liu, Dianchao, Wang, Xinhe, Li, Qicheng, and Jin, Guo

Subjects
*PROTECTIVE coatings, *SURFACE coatings, *OXIDATION kinetics, *OXIDE coating, *CRYSTAL grain boundaries
Abstract

Herein, the effects of Gd2O3 on the laser cladding NiCoCrAlYTa coatings in terms of microstructure, phase structures, high temperature oxidation behaviors were investigated. The results showed that the addition of Gd2O3 changed the composition of coating phases, promoted homogeneous phase distribution, reduced porosity and improved coating density. During oxidation at 1100 °C for 150 h, the increase in the content of added Gd2O3 (at mass fractions of 0, 0.5, 1, 2, 5 and 10%) exhibited an initial inhibitory and then increased effect on the weight-gain rate of the coatings. Overall, 1% Gd2O3 addition resulted in the greatest improvement in the oxidation resistance of the coatings, with 49.58% decreases in oxidation kinetic constants, respectively, compared with those of unmodified coatings. However, at a Gd2O3 content of 10%, the thermally grown oxide on the coating surface exhibited large flaking areas. The high-temperature oxidation kinetic parameters of the coatings exhibited an inverted parabolic form with increasing Gd2O3 content. The higher Gd2O3 content led to the formation of excessive oxygen diffusion channels along grain boundaries, which is the reason for the decrease in the anti-oxidant performance of the coating. [ABSTRACT FROM AUTHOR]

Published
2024
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105. Study on High-Temperature Properties of (La0.5Eu0.25Y0.25)2Zr2O7 Ceramic Coating.

Author

Yan, Chao, Cui, Xiufang, Jing, Yongzhi, Chen, Zhuo, Wang, Rui, Fang, Yongchao, Jin, Guo, and Liu, Erbao

Subjects
*CERAMIC coating, *THERMAL shock, *DOPING agents (Chemistry), *THERMAL insulation, *PROTECTIVE coatings, *RARE earth metals
Abstract

In this work, rare-earth elements Eu and Y were added to La2Zr2O7 (LZ) as doping elements, and the ceramic coating of (La0.5Eu0.25Y0.25)2Zr2O7 (LEYZ) was prepared. The evolution of the sintering resistance, thermal shock resistance, and thermal insulation properties of the multi-element rare-earth co-doped modified coatings under long-term and high-temperature conditions was studied. The results showed that the sintering resistance of the doped coating was significantly improved, and the coating still does not fall off after 200 h at 1100 °C. The thermal shock life of the coating at 1000 °C is increased by 47% compared with that of the undoped modified LZ coating. The length of the vertical cracks in LEYZ ceramic layer is obviously shorter than that in LZ coating, which will be more beneficial to preventing the coating from peeling off. Compared with LZ coating, the insulation temperature of the LEYZ ceramic coating is increased by 24, 26 and 34% in the range of 900 ~ 1100 °C, respectively. The coating has the best thermal insulation effect, which is consistent with theoretical calculation results. The results demonstrate that the modified lanthanum zirconate coatings doped with Europium and Yttrium has great potential in high-temperature performance. [ABSTRACT FROM AUTHOR]

Published
2024
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124. Synthesis of Ni/nano-Al2O3 coatings by brush plating with magnetic fields

Author

Tan Na, Liu Jin, Lou Liyan, Jin Guo, Cui Xiufang, and Wang Yang

Subjects
magnetic field, brush plating, preferred orientation, ni/nano-al2o3 coatings, Science
Abstract

In the process of electrodeposition, the magnetic field would generate the magneto hydrodynamic (MHD) effect, which affects the flow and mass transfer of hydrogen evolution. Thus, the performance of electrodeposition coatings will be affected. In this work, Ni/nano-Al2O3 coatings prepared by brush plating with magnetic fields were studied. The results show that the magnetic field indeed influences the morphology, texture and wears resistance. The morphology of Ni/Al2O3 coating is smooth and uniform; the (200) plane of Ni/Al2O3 coating is preferentially oriented in the same direction of a magnetic field; the wear resistance of Ni/Al2O3 composite coatings increases due to the uniform distribution of Al2O3 particles; and the wear mechanism of coating belongs to adhesive wear. The optimal intensity of magnetic field for Ni/Al2O3 composite coatings to obtain a good performance is 0.1 T.

Published
2021
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