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44 results on '"Liu, Erbao"'

18. Microstructure and luminescence properties of YSZ-based thermal barrier coatings modified by Eu2O3

Author

Jin Guo, Liu Erbao, Wang Changliang, Tian Haoliang, Guo Mengqiu, Cui Yongjing, Gao Junguo, and Wang Fuyuan

Subjects
Thermal shock, Materials science, Oxide, 02 engineering and technology, engineering.material, 01 natural sciences, Thermal barrier coating, chemistry.chemical_compound, Coating, 0103 physical sciences, Materials Chemistry, Composite material, Porosity, Yttria-stabilized zirconia, 010302 applied physics, Process Chemistry and Technology, Doping, technology, industry, and agriculture, 021001 nanoscience & nanotechnology, Microstructure, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, chemistry, Ceramics and Composites, engineering, 0210 nano-technology
Abstract

In order to study the variation of rare earth oxides during thermal failure of thermal barrier coatings, Eu2O3-doped YSZ coatings with 0.5 mol%, 1.0 mol% and 1.5 mol% were prepared by explosive spraying. SEM, XRD, EDS and microhardness tester were used to analyze the effect of different rare earth oxide doping content on the morphology, composition and mechanical properties of the coatings. The results showed that with the increase of rare earth oxide doping content, the porosity of the coatings decreased, and the microhardness and fracture toughness increased. When the doping amount of rare earth oxide is 1.0 mol%, the bonding strength and thermal cycle times of the coating are the highest, 33.4 Mpa and 185 times respectively. With the increase of the doping amount of rare earth, the luminous intensity of the sprayed coating increases. After thermal shock test, the luminous intensity of Eu2O3-doped YSZ coatings at 592 and 608 nm decreased to a certain extent.

Published
2020

19. Erosion resistance and toughening mechanism of AlBO and BNw whiskers modified thermal barrier coatings

Author

Guo Mengqiu, Jin Guo, Cui Yongjing, Gao Junguo, Wang Fuyuan, Liu Erbao, Wang Changliang, and Tian Haoliang

Subjects
010302 applied physics, Toughness, animal structures, Materials science, integumentary system, Process Chemistry and Technology, Whiskers, Fracture mechanics, 02 engineering and technology, engineering.material, 021001 nanoscience & nanotechnology, 01 natural sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Thermal barrier coating, Coating, Whisker, 0103 physical sciences, Vickers hardness test, Materials Chemistry, Ceramics and Composites, engineering, Composite material, 0210 nano-technology, Yttria-stabilized zirconia
Abstract

In order to improve the erosion resistance and toughness of thermal barrier coatings, YSZ coatings, 20 vol%-AlBOw whisker modified YSZ coatings and 20 vol%-BNw whisker modified YSZ coatings were prepared by plasma spraying. The cross-section structure, morphology, composition and phase composition of coatings and powders were analyzed by SEM, EDS and XRD. The erosion resistance of three coatings was tested by self-made erosion tester. The crack growth resistance of coatings was tested and calculated by Vickers hardness tester. The results show that the density of the coating is improved by adding AlBOw and BNw. The whisker inhibits the crack propagation through the mechanisms of crack deflection, whisker pull-out and whisker bridging. The addition of whisker improves the erosion resistance of YSZ coating by 8.17% and 13.94%, which can effectively improve the service life of thermal barrier coating.

Published
2020

20. Preparation and performance of thermal barrier coatings made of BNw-containing modified Nd2O3-doped yttria-stabilized zirconia

Author

Guo Mengqiu, Wang Changliang, Tian Haoliang, Jin Guo, Wang Fuyuan, Liu Erbao, Cui Yongjing, and Gao Junguo

Subjects
010302 applied physics, Materials science, Scanning electron microscope, Process Chemistry and Technology, 02 engineering and technology, engineering.material, 021001 nanoscience & nanotechnology, 01 natural sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Thermal barrier coating, chemistry.chemical_compound, Fracture toughness, chemistry, Coating, Boron nitride, Whisker, 0103 physical sciences, Materials Chemistry, Ceramics and Composites, engineering, Cubic zirconia, Composite material, 0210 nano-technology, Yttria-stabilized zirconia
Abstract

To enhance the fracture toughness and thermal shock resistance of the thermal barrier coatings (TBCs), detonation spraying has been used to prepare modified neodymium (Ⅲ) oxide (Nd2O3)-doped yttria-stabilized zirconia (YSZ) TBCs containing 20 vol% (D1 coating) and 30 vol% (D2 coating) of boron nitride whiskers (BNws). Analyses were performed using a scanning electron microscope (SEM), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), and a microhardness tester to examine the manner in which the doping content of different rare earth oxides affected the coating morphology, composition, and mechanical properties. The results denoted that the porosity of the D2 coating was 47.9% higher than that of the D1 coating; the whisker content was 30 vol% in the former and 20 vol% in the latter. The increased porosity reduced the microhardness and bond strength of the coating. However, the fracture toughness (KIC) of the D2 coating was increased to 2.67 MPa·m1/2 because the whisker content was 8.5% higher than that in the D1 coating. The thermal cycling life of the D2 coating was 245 cycles, and its thermal shock resistance was 9.9% higher when compared with that of the D1 coating. A TBC with better overall performance was obtained when BNw reached 30 vol%.

Published
2020

21. Computer Simulation of Surface Cracks Behavior in Anhydrous Chemical Conversion Coatings on Magnesium Alloy

Author

Jin Guo, Cui Xiufang, Cai Zhaobing, Liu Erbao, Fang Yongchao, and Li Lijie

Subjects
010302 applied physics, Surface (mathematics), Work (thermodynamics), Materials science, 020502 materials, General Engineering, 02 engineering and technology, engineering.material, 01 natural sciences, Finite element method, 0205 materials engineering, Coating, Conversion coating, 0103 physical sciences, Chemical conversion, engineering, Anhydrous, Composite material, Magnesium alloy
Abstract

In the conversion coatings, some uniformly distributed micro surface cracks always occur but the surface cracks behavior is rarely studied due to the frequent initiation in the real test conditions. In this work, computer simulation of micro surface cracks behavior and internal stresses generated in the anhydrous chemical conversion coating was carried out using the finite element method with the help of ABAQUS software. The Mises stress distribution, S11 stress variation, and the stress-time curves were obtained. The results show that the internal stresses generated in the conversion coating increase obviously with increasing time, and the stresses at the center and boundary of coating pieces are bigger than the ones in other areas while the S11 stresses around the center are bigger than the ones near the boundary. The cracks at the interface of coating pieces develop gradually and are as V-type cracks finally. The width of crack mouth opened is different since the contraction degree of each coating piece is different.

Published
2018

25. Corrigendum to 'Preparation and performance of thermal barrier coatings made of BNw-containing modified Nd2O3-doped yttria-stabilized zirconia' [Ceram. Int. 46 (2019) 500–507]

Author

Wang Changliang, Tian Haoliang, Gao Junguo, Guo Mengqiu, Cui Yongjing, Liu Erbao, Jin Guo, and Wang Fuyuan

Subjects
Thermal barrier coating, Materials science, Process Chemistry and Technology, Doping, Materials Chemistry, Ceramics and Composites, Composite material, Yttria-stabilized zirconia, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials
Published
2020

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