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学者姓名:杨冠军

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< Page ,Total 46 >
Effect of processing current on microstructural evolution and orientation information in Ni-based single crystal superalloy during plasma remelting EI SCIE
期刊论文 | 2021 , 861 | JOURNAL OF ALLOYS AND COMPOUNDS
WoS CC Cited Count: 1
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Abstract :

The microstructural evolution and orientation information in the plasma re-melted Ni-based single crystal superalloy are systematically researched. The bowl-shaped FZ with small depth/width ratio is obtained under a wide range of processing current. The re-precipitated gamma' phase in the position of origin gamma' phase is apparently larger than that in the position of origin gamma matrix at the bottom part of HAZ, and more gamma' phase re-precipitates in the origin gamma matrix under larger processing currents in the HAZ. The gamma' phase in the interdendrite is larger than that in the dendrite core and both increase with the processing current rising. No obvious element burning occurs during the re-melting and the segregated degree for each element hardly changes from 25 to 45 A. The transition regions exist higher plastic strain than inside the dendrite zones except at 45 A. The low plastic strains at 25 and 45 A are respectively attributed to the few transition regions and extensive stray grains formation. The 25 and 30 A are more suitable considering the position and area fraction of stray grains together with the orientation deviation in general. The results display the potential possibility for the repairing by plasma besides the current technologies. (C) 2021 Elsevier B.V. All rights reserved.

Keyword :

Orientation information Composition distribution Ni-based single crystal superalloy Plasma re-melting Microstructural evolution

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GB/T 7714 Lou, Zheng-Ji , Liu, Hong , Yang, Guan-Jun et al. Effect of processing current on microstructural evolution and orientation information in Ni-based single crystal superalloy during plasma remelting [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2021 , 861 .
MLA Lou, Zheng-Ji et al. "Effect of processing current on microstructural evolution and orientation information in Ni-based single crystal superalloy during plasma remelting" . | JOURNAL OF ALLOYS AND COMPOUNDS 861 (2021) .
APA Lou, Zheng-Ji , Liu, Hong , Yang, Guan-Jun , Wen, Yuan-Yun , Li, Yang . Effect of processing current on microstructural evolution and orientation information in Ni-based single crystal superalloy during plasma remelting . | JOURNAL OF ALLOYS AND COMPOUNDS , 2021 , 861 .
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Lead-Free Perovskite-Based Bifunctional Device for Both Photoelectric Conversion and Energy Storage EI SCIE
期刊论文 | 2021 , 4 (8) , 7952-7958 | ACS APPLIED ENERGY MATERIALS
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Abstract :

Integrating revolutionary perovskite solar cells with energy storage devices is a very promising technology to reduce the total cost of solar power utilization. Here, for the first time, lead-free (C6H5NH3)BiI4 perovskite materials were used as light absorbers in low-cost triple-layer mesoscopic perovskite solar cells with a power conversion efficiency of 0.35%. We fabricated a dense and pinhole-free (C6H5NH3)BiI4 perovskite film via homemade gas pump treatment equipment. We discovered storage characteristics in this carbon electrode-based, hole-conductor-free, and fully printable mesoporous solar cells infiltrated by (C6H5NH3)BiI4 perovskite, which indicates that this type of device might work under dark conditions. This study may provide some useful inspiration for the further exploration of the potential of (C6H5NH3)BiI4 as a lead-free candidate for the direct storage of electric energy in solar cells.

Keyword :

solar cell lead-free hole-conductor-free storage characteristic perovskite

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GB/T 7714 Li, Xiao-Lei , Long, Ke-Cheng , Zhang, Gao et al. Lead-Free Perovskite-Based Bifunctional Device for Both Photoelectric Conversion and Energy Storage [J]. | ACS APPLIED ENERGY MATERIALS , 2021 , 4 (8) : 7952-7958 .
MLA Li, Xiao-Lei et al. "Lead-Free Perovskite-Based Bifunctional Device for Both Photoelectric Conversion and Energy Storage" . | ACS APPLIED ENERGY MATERIALS 4 . 8 (2021) : 7952-7958 .
APA Li, Xiao-Lei , Long, Ke-Cheng , Zhang, Gao , Zou, Wei-Tian , Jiang, Shuang-Quan , Zhang, De-Yi et al. Lead-Free Perovskite-Based Bifunctional Device for Both Photoelectric Conversion and Energy Storage . | ACS APPLIED ENERGY MATERIALS , 2021 , 4 (8) , 7952-7958 .
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Condensation behavior of gaseous phase during transported in the near-substrate boundary layer of plasma spray-physical vapor deposition EI SCIE
期刊论文 | 2021 , 67 , 127-134 | Journal of Materials Science and Technology
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Abstract :

Plasma spray-physical vapor deposition (PS-PVD) has exhibited the potential ability to prepare columnar structures for advanced thermal barrier coatings (TBCs). The coating structure is nominally affected by operating parameters, but it is controlled by the type of deposition unit actually and essentially. In order to realize the columnar structure deposited by gaseous phase units, the transition behavior of gaseous phase units to clusters must be fundamentally understood. This work investigated the transport process of gaseous phase units in the PS-PVD near-substrate boundary layer along with the condensation behavior. The Monte Carlo method was used to examine the transport process and condensation behavior of gaseous phase units under different scale boundary layers. Simulation results show that it is easier to form more numerous larger clusters at the edge of the plasma jet than at the center. Based on the understanding of the changes in deposition unit caused by the condensation of gaseous phase in the near-substrate boundary layer of PS-PVD, an outlook towards TBCs with different structures is presented. And it is in good agreement with the experimental data. © 2020

Keyword :

Plasma spraying Physical vapor deposition Monte Carlo methods Boundary layers Condensation Thermal barrier coatings Plasma jets

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GB/T 7714 Liu, Mei-Jun , Yang, Guan-Jun . Condensation behavior of gaseous phase during transported in the near-substrate boundary layer of plasma spray-physical vapor deposition [J]. | Journal of Materials Science and Technology , 2021 , 67 : 127-134 .
MLA Liu, Mei-Jun et al. "Condensation behavior of gaseous phase during transported in the near-substrate boundary layer of plasma spray-physical vapor deposition" . | Journal of Materials Science and Technology 67 (2021) : 127-134 .
APA Liu, Mei-Jun , Yang, Guan-Jun . Condensation behavior of gaseous phase during transported in the near-substrate boundary layer of plasma spray-physical vapor deposition . | Journal of Materials Science and Technology , 2021 , 67 , 127-134 .
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Densification method of air-plasma-sprayed environmental barrier coatings achieved by pre-heat treatment EI
期刊论文 | 2021 , 49 (11) , 116-124 | Journal of Materials Engineering
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Abstract :

High density of the top coat of environmental barrier coatings (EBC) is important for ensuring its performance in water vapor environment, which is also significant for prolonging service lifetime of SiCf/SiC aero-engine hot components. In this work, densification of the top coat of EBC was achieved by pre-heat treatment. In detail, the as-sprayed porous Yb2SiO5 coatings were heat-treated at the high temperature of 1250 to 1450 , which improve the density significantly. Changes in microstructure and mechanical properties during the pre-heat treatment were studied by classifying defects into different types. The processes of defects-healing were observed, and the mechanism responsible for coating densification was revealed. Results show that the porosity of as-sprayed Yb2SiO5 coating is high due to the existence of three types of micro-defects, including two-dimensional (2D) inter-splat pores, 2D intra-splat cracks and three-dimensional (3D) spherical pores. During the pre-heat treatment process, 2D defects are healed to be reduced in a large amount in a short duration, while the 3D spherical pores seem unchanged. The mechanism of defects-healing in the heat treatment process is that grain growth inside the coating makes surface of the pores rough, which leads to multiple bridge-connection of 2D pores. As a result, the original continuous defects are divided into several sections and are further spheroidized. The method of pre-heat treatment for APS-EBC would make a fundamental contribution to its further engineering application. © 2021, Journal of Materials Engineering. All right reserved.

Keyword :

Sprayed coatings Plasma jets Plasma spraying Silicon Densification Aircraft engines Grain growth Heat treatment Silicon compounds

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GB/T 7714 Yang, Bo , Li, Guang-Rong , Xu, Tong et al. Densification method of air-plasma-sprayed environmental barrier coatings achieved by pre-heat treatment [J]. | Journal of Materials Engineering , 2021 , 49 (11) : 116-124 .
MLA Yang, Bo et al. "Densification method of air-plasma-sprayed environmental barrier coatings achieved by pre-heat treatment" . | Journal of Materials Engineering 49 . 11 (2021) : 116-124 .
APA Yang, Bo , Li, Guang-Rong , Xu, Tong , Yang, Guan-Jun . Densification method of air-plasma-sprayed environmental barrier coatings achieved by pre-heat treatment . | Journal of Materials Engineering , 2021 , 49 (11) , 116-124 .
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Friction Stir Welding of 1Cr11Ni2W2MoV Martensitic Stainless Steel: Numerical Simulation Based on Coupled Eulerian Lagrangian Approach Supported with Experimental Work SCIE
期刊论文 | 2021 , 11 (7) | APPLIED SCIENCES-BASEL
WoS CC Cited Count: 2
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Abstract :

1Cr11Ni2W2MoV is a new martensitic heat-resistant stainless steel utilized in the manufacturing of aero-engine high-temperature bearing components. Welding of this type of steel using fusion welding techniques causes many defects. Friction stir welding (FSW) is a valuable alternative. However, few investigations have been performed on the FSW of steels because of the high melting point and the costly tools. Numerical simulation in this regard is a cost-effective solution for the FSW of this steel in order to optimize the parameters and to reduce the number of experiments for obtaining high-quality joints. In this study, a 3D thermo-mechanical finite element model based on the Coupled Eulerian Lagrangian (CEL) approach was developed to study the FSW of 1Cr11Ni2W2MoV steel. Numerical results of metallurgical zones' shape and weld appearance at different tool rotation rates of 250, 350, 450 and 550 rpm are in good agreement with the experimental results. The results revealed that the peak temperature, plastic strain, surface roughness and flash size increased with an increase in the tool rotation rate. Lack-of-fill defect was produced at the highest tool rotation rate of 650 rpm. Moreover, an asymmetrical stir zone was produced at a high tool rotation rate.

Keyword :

numerical simulation Coupled Eulerian Lagrangian flash formation friction stir welding

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GB/T 7714 Ragab, Mohamed , Liu, Hong , Yang, Guan-Jun et al. Friction Stir Welding of 1Cr11Ni2W2MoV Martensitic Stainless Steel: Numerical Simulation Based on Coupled Eulerian Lagrangian Approach Supported with Experimental Work [J]. | APPLIED SCIENCES-BASEL , 2021 , 11 (7) .
MLA Ragab, Mohamed et al. "Friction Stir Welding of 1Cr11Ni2W2MoV Martensitic Stainless Steel: Numerical Simulation Based on Coupled Eulerian Lagrangian Approach Supported with Experimental Work" . | APPLIED SCIENCES-BASEL 11 . 7 (2021) .
APA Ragab, Mohamed , Liu, Hong , Yang, Guan-Jun , Ahmed, Mohamed M. Z. . Friction Stir Welding of 1Cr11Ni2W2MoV Martensitic Stainless Steel: Numerical Simulation Based on Coupled Eulerian Lagrangian Approach Supported with Experimental Work . | APPLIED SCIENCES-BASEL , 2021 , 11 (7) .
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A methylammonium iodide healing method for CH3NH3PbI3 perovskite solar cells with high fill factor over 80% EI CSCD
期刊论文 | 2021 , 42 (11) | Journal of Semiconductors
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Abstract :

Repressing the thermal decomposition during the process of heat treatment plays an indispensable part in the preparation of perovskite films. Here, a methylammonium iodide healing method was applied to prevent the volatilization of the organic component inside the perovskite structure during the heat treatment. High-quality CH3NH3PbI3 film with a much larger grain size over 800 nm was successfully fabricated via this healing method. Besides, the absorption and photoluminescence intensity were also both improved. Finally, the best power conversion efficiency of 18.89% with a fill factor over 80% was realized in an n–i–p configuration while possessing outstanding stability. This work suggests that methylammonium iodide healing method is a reliable way to promote crystal growth and improve the photovoltaic performance and humidity stability of the CH3NH3PbI3 solar cells. ©2021 Chinese Institute of Electronics

Keyword :

Film preparation Solar power generation Decomposition Perovskite Heat treatment Perovskite solar cells

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GB/T 7714 Li, Zhen , Yang, Guanjun . A methylammonium iodide healing method for CH3NH3PbI3 perovskite solar cells with high fill factor over 80% [J]. | Journal of Semiconductors , 2021 , 42 (11) .
MLA Li, Zhen et al. "A methylammonium iodide healing method for CH3NH3PbI3 perovskite solar cells with high fill factor over 80%" . | Journal of Semiconductors 42 . 11 (2021) .
APA Li, Zhen , Yang, Guanjun . A methylammonium iodide healing method for CH3NH3PbI3 perovskite solar cells with high fill factor over 80% . | Journal of Semiconductors , 2021 , 42 (11) .
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Lightweight epoxy-based abradable seal coating with high bonding strength EI SCIE
期刊论文 | 2021 , 69 , 129-137 | Journal of Materials Science and Technology
WoS CC Cited Count: 2
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Abstract :

To gain high efficiency and low fuel consumption, aluminum-based abradable seal coatings had been widely used in the compressor casing of aero engines or gas turbines owing to the low elastic modulus. However, the adhesive transfer phenomenon frequently occurs when the radial rubbing generates between titanium alloy blade tips and aluminum-based coating. It tends to increase scratch force and results in blades vibration and even engine jam. To eliminate this problem, a new lightweight epoxy-based abradable seal coating with high bonding strength was developed by an effective and porosity controllable mixing process that distributes spherical pores uniformly in the continuous matrix. A lightweight coating of 63% porosity with a hardness of 33.1(HR15Y) can be reached when the content of hollow microspheres is 31 wt.%. The coating density is 0.5 g/cm3 and the bonding strength is as high as 18 MPa. The performance of the epoxy-based coating is comprehensively better than aluminum-based coatings in five essential indices. This study is expected to provide a new technical path for obtaining high-quality abradable seal coatings to guarantee the efficient and safe operation of compressors. © 2020

Keyword :

Seals Aluminum coated steel Engines Porosity Aircraft engines Titanium alloys Adhesives Aluminum coatings Combustion

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GB/T 7714 Tong, Yun-Qi , Shi, Qiu-Sheng , Liu, Mei-Jun et al. Lightweight epoxy-based abradable seal coating with high bonding strength [J]. | Journal of Materials Science and Technology , 2021 , 69 : 129-137 .
MLA Tong, Yun-Qi et al. "Lightweight epoxy-based abradable seal coating with high bonding strength" . | Journal of Materials Science and Technology 69 (2021) : 129-137 .
APA Tong, Yun-Qi , Shi, Qiu-Sheng , Liu, Mei-Jun , Li, Guang-Rong , Li, Chang-Jiu , Yang, Guan-Jun . Lightweight epoxy-based abradable seal coating with high bonding strength . | Journal of Materials Science and Technology , 2021 , 69 , 129-137 .
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Dynamic-stiffening-induced aggravated cracking behavior driven by metal-substrate-constraint in a coating/substrate system EI SCIE
期刊论文 | 2021 , 65 , 154-163 | Journal of Materials Science and Technology
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Abstract :

Air plasma sprayed thermal barrier coatings (APS-TBCs) saw their wide application in high-temperature-related cutting-edge fields. The lamellar structure of APS-TBCs provides a significant advantage on thermal insulation. However, short life span is a major headache for APS-TBCs. This is highly related to the property changes and passive behaviors of the coatings during thermal service. Herein, a finite element model was developed to investigate the dynamic stiffening and substrate constraint on total spallation process. Results show that the stiffening accelerates the crack propagation of APS-TBCs. The driving force for crack propagation, which is characterized by strain energy release rate (SERR), is significantly enlarged. Consequently, the crack starts to propagate when the SERR exceeds the fracture toughness. In addition, the changing trends of SERR and crack propagation features are highly associated with temperatures. A higher temperature corresponds to more significant effect of stiffening on substrate constraint. In brief, temperature-dependent stiffening significantly aggravates the substrate constraint effect on APS-TBCs, which is one of the major causes for the spallation. Given that, lowering stiffening degree is essential to maintain high strain tolerance, and to further extend the life span of APS-TBCs. This understanding contributes to the development of advanced TBCs in future applications. © 2020

Keyword :

Sprayed coatings Fracture toughness Crack propagation Strain energy Cracks Strain rate Plasma spraying Spalling Thermal barrier coatings Thermal insulation Lamellar structures

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GB/T 7714 Li, Guangrong , Tang, Chunhua , Yang, Guanjun . Dynamic-stiffening-induced aggravated cracking behavior driven by metal-substrate-constraint in a coating/substrate system [J]. | Journal of Materials Science and Technology , 2021 , 65 : 154-163 .
MLA Li, Guangrong et al. "Dynamic-stiffening-induced aggravated cracking behavior driven by metal-substrate-constraint in a coating/substrate system" . | Journal of Materials Science and Technology 65 (2021) : 154-163 .
APA Li, Guangrong , Tang, Chunhua , Yang, Guanjun . Dynamic-stiffening-induced aggravated cracking behavior driven by metal-substrate-constraint in a coating/substrate system . | Journal of Materials Science and Technology , 2021 , 65 , 154-163 .
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Strain-induced multiscale structural changes in lamellar thermal barrier coatings (vol 43, pg 2252, 2017) SCIE Scopus
期刊论文 | 2020 , 46 (3) , 4039-4040 | CERAMICS INTERNATIONAL
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GB/T 7714 Li, Guang-Rong , Yang, Guan-Jun , Li, Cheng-Xin et al. Strain-induced multiscale structural changes in lamellar thermal barrier coatings (vol 43, pg 2252, 2017) [J]. | CERAMICS INTERNATIONAL , 2020 , 46 (3) : 4039-4040 .
MLA Li, Guang-Rong et al. "Strain-induced multiscale structural changes in lamellar thermal barrier coatings (vol 43, pg 2252, 2017)" . | CERAMICS INTERNATIONAL 46 . 3 (2020) : 4039-4040 .
APA Li, Guang-Rong , Yang, Guan-Jun , Li, Cheng-Xin , Li, Chang-Jiu . Strain-induced multiscale structural changes in lamellar thermal barrier coatings (vol 43, pg 2252, 2017) . | CERAMICS INTERNATIONAL , 2020 , 46 (3) , 4039-4040 .
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Dense Mn1.5Co1.5O4 coatings with excellent long-term stability and electrical performance under the SOFC cathode environment EI SCIE Scopus
期刊论文 | 2020 , 499 | APPLIED SURFACE SCIENCE | IF: 6.707
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The long-term operation of intermediate temperature-solid oxide fuel cells (IT-SOFCs) could be significantly influenced by the stability of the interconnect itself, especially, its oxidation resistance under the cathode environment. In this work, dense 80-mu m-thick Mn1.5Co1.5O4 (MCO) coatings were directly applied on T441 interconnects via cost-effective atmospheric plasma spray (APS) without any post-treatment. The MCO-coated T441 interconnect and La0.8Sr0.2MnO3 (LSM)//MCO/T441 contact coupling were separately exposed to high-temperature oxidative environment to evaluate their long-term oxidation resistance and electric performance. A rather low area-specific electrical resistance (ASR) of 13 m Omega.cm(2) was obtained for MCO-coated T441 at the end of 2000-h test cycle, and a similar decrement was observed for the LSM-MCO/T441 couple with a final ASR of 13.6 m Omega.cm(2) at the end of 1200-h cycle. Electron back scattering diffraction was performed to explore the oxidation characteristic of the MCO/T441 interface. In addition, first-principles computations were conducted to evaluate the structural stability of various possible interfacial oxides using the Castep program based on the density functional theory. The results indicated that the APS-MCO coating exhibits high grain stability and effectively improves the oxidation resistance of the T441 interconnect during long-term operation under the SOFC cathode environment.

Keyword :

First-principles computations Solid oxide fuel cells Atmospheric plasma spray Mn1.5Co1.5O4 Long-term stability

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GB/T 7714 Hu, Ying-Zhen , Su, Yun-Ting , Li, Cheng-Xin et al. Dense Mn1.5Co1.5O4 coatings with excellent long-term stability and electrical performance under the SOFC cathode environment [J]. | APPLIED SURFACE SCIENCE , 2020 , 499 .
MLA Hu, Ying-Zhen et al. "Dense Mn1.5Co1.5O4 coatings with excellent long-term stability and electrical performance under the SOFC cathode environment" . | APPLIED SURFACE SCIENCE 499 (2020) .
APA Hu, Ying-Zhen , Su, Yun-Ting , Li, Cheng-Xin , Li, Chang-Jiu , Yang, Guan-Jun . Dense Mn1.5Co1.5O4 coatings with excellent long-term stability and electrical performance under the SOFC cathode environment . | APPLIED SURFACE SCIENCE , 2020 , 499 .
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