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< Page ,Total 28 >
Rapid and low-cost laser synthesis of hierarchically porous graphene materials as high-performance electrodes for supercapacitors EI SCIE
期刊论文 | 2019 , 54 (7) , 5658-5670 | Journal of Materials Science
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Abstract :

Development of 3D hierarchically porous graphene (HPG) with supercapacitor performances at low cost has remained a challenge in electrochemical devices. Recently, laser engraving technology has been proposed as a promising and very useful method to inscribe self-designed electrode array directly onto polymeric substrates by instantaneously converting the starting material into few-layer graphene. Here we show HPG fabrication on commercial bakelite resulting in porous graphene embedded in polymer surface using the high repetition nanosecond fiber laser engraving under nitrogen atmosphere. The results showed that the as-prepared HPG presents a combination of interconnected macro-, meso- and micropores with a multi-modal pore size distribution. The morphologies, microstructures and their properties of HPG films can be governed by the laser processing parameters. Moreover, the HPG-based supercapacitors show outstanding electrochemical performance with specific capacitance superior to other supercapacitors reported previously. The simple, rapid and low-cost approach proposed in this work has great potential in large-scale applications of electronic and energy storage devices. © 2018, Springer Science+Business Media, LLC, part of Springer Nature.

Keyword :

Electrochemical devices Electrochemical performance Hierarchically porous Large-scale applications Laser processing parameters Nitrogen atmospheres Polymeric substrate Specific capacitance

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GB/T 7714 Wang, Fangcheng , Mei, Xuesong , Wang, Kedian et al. Rapid and low-cost laser synthesis of hierarchically porous graphene materials as high-performance electrodes for supercapacitors [J]. | Journal of Materials Science , 2019 , 54 (7) : 5658-5670 .
MLA Wang, Fangcheng et al. "Rapid and low-cost laser synthesis of hierarchically porous graphene materials as high-performance electrodes for supercapacitors" . | Journal of Materials Science 54 . 7 (2019) : 5658-5670 .
APA Wang, Fangcheng , Mei, Xuesong , Wang, Kedian , Dong, Xia , Gao, Meng , Zhai, Zhaoyang et al. Rapid and low-cost laser synthesis of hierarchically porous graphene materials as high-performance electrodes for supercapacitors . | Journal of Materials Science , 2019 , 54 (7) , 5658-5670 .
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Positioning and navigation system based on machine vision intended for laser-electrochemical micro-hole processing EI SCIE Scopus
期刊论文 | 2018 , 94 (1-4) , 1397-1410 | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
SCOPUS Cited Count: 1
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Abstract :

In order to improve efficiency and quality of micro-hole processing, a laser-electrochemical micro-hole processing is applied to the micro-hole processing of aero engine blade, i.e., laser drilling and electrochemical machining are performed. However, when electrode wire is inserted into micro-hole, due to the positioning error, it can collide with blade, which could result in short circuit or electrode wire damage. Hitherto, the positioning of electrode wire and micro-hole was achieved by artificial observation, but its efficiency is low, especially for micro-holes with small diameter. Namely, a large amount of asymmetric micro-holes is produced due to the low-accuracy positioning by artificial observation; therefore, machining accuracy and consistency of micro-hole cannot be guaranteed. In this study, a positioning and navigation system based on machine vision is applied for the first time to the laser-electrochemical micro-hole processing. The proposed system is based on parallel installation of camera and electrode wire. A novel hand-eye calibration method, wherein rotation angle and translation vector are calibrated step by step, is proposed for the case when electrode wire is beyond the view area of camera. The tree traversal binary image boundary tracking algorithm is adopted to image processing. The data stem definition is proposed to detect micro-hole edge with burrs. Before electrochemical machining, the micro-hole image is captured by camera that is navigated to the micro-hole top, and then, the captured image is processed in order to get the coordinates of micro-hole center, which enables navigation of electrode wire to the micro-hole center; thus, the accurate positioning and navigation of micro-hole are achieved.

Keyword :

Calibration Machine vision Positioning Micro-hole detection Laser-electrochemical processing Navigation

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GB/T 7714 Jia, Guohua , Dong, Xia , Huo, Quan et al. Positioning and navigation system based on machine vision intended for laser-electrochemical micro-hole processing [J]. | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2018 , 94 (1-4) : 1397-1410 .
MLA Jia, Guohua et al. "Positioning and navigation system based on machine vision intended for laser-electrochemical micro-hole processing" . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 94 . 1-4 (2018) : 1397-1410 .
APA Jia, Guohua , Dong, Xia , Huo, Quan , Wang, Kedian , Mei, Xuesong . Positioning and navigation system based on machine vision intended for laser-electrochemical micro-hole processing . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2018 , 94 (1-4) , 1397-1410 .
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Laser-induced graphene: preparation, functionalization and applications EI SCIE Scopus
期刊论文 | 2018 , 33 (5) , 340-356 | MATERIALS TECHNOLOGY
WoS CC Cited Count: 3 SCOPUS Cited Count: 4
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Abstract :

Recently graphene-based materials (GBMs) have gained tremendous attention for their enormous potentials for various functional devices due to their excellent physical and chemical properties. However, the cost effective synthesis and patterning of carbon nanomaterials are a challenge, which significantly restricts its applications. Therefore, straightforward preparation and processing of GBMs in a scalable approach is still a important goal. In recent years, laser direct writing (LDW) technique provides a powerful processing method for the broad application of laser-induced graphene (LIG) which does not rely on either high temperature or toxic chemicals. This article aims to update the latest results in this rapidly evolving field and to provide critical insights to inspire more exciting developments of LIG and its functionalization. Based on the interaction mechanisms and physical effects, we comparatively review the methods of preparation and functionalization of LIG, including inducing, structuring, doping and hybriding. In this progress report, the applications of LIG and its GBMs patterned by LDW technique were discussed in the fields of optoelectronic devices, energy storage devices, biosensors and biomimetic devices.

Keyword :

LIG preparation applications LDW functionalization precursors

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GB/T 7714 Wang, Fangcheng , Wang, Kedian , Zheng, Buxiang et al. Laser-induced graphene: preparation, functionalization and applications [J]. | MATERIALS TECHNOLOGY , 2018 , 33 (5) : 340-356 .
MLA Wang, Fangcheng et al. "Laser-induced graphene: preparation, functionalization and applications" . | MATERIALS TECHNOLOGY 33 . 5 (2018) : 340-356 .
APA Wang, Fangcheng , Wang, Kedian , Zheng, Buxiang , Dong, Xia , Mei, Xuesong , Lv, Jing et al. Laser-induced graphene: preparation, functionalization and applications . | MATERIALS TECHNOLOGY , 2018 , 33 (5) , 340-356 .
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Thermal Characteristics of Plastic Film Tension in Roll-to-Roll Gravure Printed Electronics SCIE Scopus
期刊论文 | 2018 , 8 (2) | APPLIED SCIENCES-BASEL
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

In the printing section of a roll-to-roll gravure printed electronics machine, the plastic film tension is directly associated with the product quality. The temperature distribution of the plastic film in the printing section is non-uniform, because of the higher drying temperature and the lower room temperature. Furthermore, the drying temperature and the room temperature are not constants in industrial production. As the plastic film is sensitive to temperature, the temperature of the plastic film will affects the web tension in the printing section. In this paper, the thermal characteristics of the plastic film tension in roll-to-roll gravure printed electronics are studied in order to help to improve the product quality. First, the tension model including the factor of temperature is derived based on the law of mass conservation. Then, some simulations and experiments are carried out in order to in-depth research the effects of the drying temperature and room temperature based on the relations between system inputs and outputs. The results show that the drying temperature and room temperature have significant influences on the web tension. The research on the thermal characteristics of plastic film tension would benefit the tension control accuracy for further study.

Keyword :

printed electronics thermal characteristics drying temperature room temperature web tension tension model

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GB/T 7714 He, Kui , Liu, Shanhui , Wang, Kedian et al. Thermal Characteristics of Plastic Film Tension in Roll-to-Roll Gravure Printed Electronics [J]. | APPLIED SCIENCES-BASEL , 2018 , 8 (2) .
MLA He, Kui et al. "Thermal Characteristics of Plastic Film Tension in Roll-to-Roll Gravure Printed Electronics" . | APPLIED SCIENCES-BASEL 8 . 2 (2018) .
APA He, Kui , Liu, Shanhui , Wang, Kedian , Mei, Xuesong . Thermal Characteristics of Plastic Film Tension in Roll-to-Roll Gravure Printed Electronics . | APPLIED SCIENCES-BASEL , 2018 , 8 (2) .
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Effect of the surface microstructure ablated by femtosecond laser on the bonding strength of EBCs for SiC/SiC composites EI SCIE Scopus
期刊论文 | 2018 , 424 , 137-144 | OPTICS COMMUNICATIONS
SCOPUS Cited Count: 2
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Abstract :

The bonding strength between environmental barrier coatings (EBCs) and silicon carbide fiber reinforced silicon carbide (SiC/SiC) was improved by preparing microstructure on SiC/SiC surface with femtosecond laser. The processing morphologies with different parameters were compared. There was oxidation phenomenon at the edge of laser processing, and the degree of graphitization was increased. Without damage the internal fiber structure of SiC/SiC, reasonable processing parameters were selected, and microgroove structure was processed on the SiC/SiC surface using the femtosecond laser. The tension test results showed that, after the femtosecond laser machining, the bonding strength between EBCs and SiC/SiC could be improved by about 5.5%, and the time spent to reach the critical load was extended by 11.2%. The EBCs regularly adheres to the microgrooves formed by the femtosecond laser processing, while EBCs in the area without the laser processing was completely detached.

Keyword :

Bonding strength SiC/SiC Femtosecond laser Microgrooves EBCs

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GB/T 7714 Zhai, Zhaoyang , Wang, Wenjun , Mei, Xuesong et al. Effect of the surface microstructure ablated by femtosecond laser on the bonding strength of EBCs for SiC/SiC composites [J]. | OPTICS COMMUNICATIONS , 2018 , 424 : 137-144 .
MLA Zhai, Zhaoyang et al. "Effect of the surface microstructure ablated by femtosecond laser on the bonding strength of EBCs for SiC/SiC composites" . | OPTICS COMMUNICATIONS 424 (2018) : 137-144 .
APA Zhai, Zhaoyang , Wang, Wenjun , Mei, Xuesong , Li, Ming , Cui, Jianlei , Wang, Fangcheng et al. Effect of the surface microstructure ablated by femtosecond laser on the bonding strength of EBCs for SiC/SiC composites . | OPTICS COMMUNICATIONS , 2018 , 424 , 137-144 .
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Computational and experimental study on hole evolution and delamination in laser drilling of thermal barrier coated nickel superalloy EI SCIE Scopus
期刊论文 | 2018 , 107 , 161-175 | OPTICS AND LASERS IN ENGINEERING
SCOPUS Cited Count: 1
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Abstract :

Computational study related to thermal stress and hole formation in laser percussion drilling of thermal barrier coated nickel alloy based on a thermal-mechanical coupled model, combined with experimental work, was conducted in this paper. The effects of laser parameters (pulse duration and laser power) and material property (elastic modulus) on delamination were discussed based on thermal stress analysis. Laser drilling with higher peak power density (>1e11W/m(2)) can quickly get a through-hole of 2.3 mm within 10 pulses. Stress mutation and thermal stress shock near the interfaces are responsible for the crack formation. For the case with low peak power density, solidification rate and solidification sequence between materials should also be considered. Under the same pulse duration, the thermal stress would be enhanced with increasing of laser power. With the same pulse energy, a more intense thermal stress shock in pulse cycles can be produced under a longer pulse duration. And this shock effect near the interfaces can be alleviated when laser source is far from the interfaces. Heat accumulating effect induced by stagnation phenomenon, mainly due to lower peak power, can contribute to crack extension along the interfaces. Thus, breaking through the first two layers with high drilling efficiency is an effective way to restrain/prevent the delamination and viable parameters are also determined in the paper. Furthermore, it would offer great benefits for delamination prevention that make sure the elastic modulus of TBC and BC close to each other along the thickness with a gradually approaching method in their preparations. (C) 2018 Elsevier Ltd. All rights reserved.

Keyword :

Thermal barrier coatings (TBCs) Simulation Delamination Laser drilling Thermal stress

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GB/T 7714 Wang, Rujia , Duan, Wenqiang , Wang, Kedian et al. Computational and experimental study on hole evolution and delamination in laser drilling of thermal barrier coated nickel superalloy [J]. | OPTICS AND LASERS IN ENGINEERING , 2018 , 107 : 161-175 .
MLA Wang, Rujia et al. "Computational and experimental study on hole evolution and delamination in laser drilling of thermal barrier coated nickel superalloy" . | OPTICS AND LASERS IN ENGINEERING 107 (2018) : 161-175 .
APA Wang, Rujia , Duan, Wenqiang , Wang, Kedian , Dong, Xia , Fan, Zhengjie , Mei, Xuesong et al. Computational and experimental study on hole evolution and delamination in laser drilling of thermal barrier coated nickel superalloy . | OPTICS AND LASERS IN ENGINEERING , 2018 , 107 , 161-175 .
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Effect of temporal control of air/water environment on laser drilling of nickel-based alloy with thermal barrier coatings EI SCIE Scopus
期刊论文 | 2018 , 97 (9-12) , 3395-3405 | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

This study adopted nanosecond laser to conduct drilling research on nickel-based alloy with thermal barrier coatings (TBCs). The experiments of different processing environments on quality and efficiency of laser drilling were conducted. Through combination of high processing efficiency under air environment and good processing quality under water environment, temporal control of air/water environment on laser drilling is proposed. Since drilling efficiency was not significantly reduced, cold machining effect of water was used to improve processing quality. Research results proved that laser processing method with temporal control of air/water environment has advantages of traditional laser drilling under air and water. Laser drilling of temporal control of air/water environment was improved in quality in comparison with single environment.

Keyword :

Processing environment Thermal barrier coatings Laser drilling Temporal control Nickel-based alloy

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GB/T 7714 Zhai, Zhaoyang , Wang, Wenjun , Mei, Xuesong et al. Effect of temporal control of air/water environment on laser drilling of nickel-based alloy with thermal barrier coatings [J]. | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2018 , 97 (9-12) : 3395-3405 .
MLA Zhai, Zhaoyang et al. "Effect of temporal control of air/water environment on laser drilling of nickel-based alloy with thermal barrier coatings" . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 97 . 9-12 (2018) : 3395-3405 .
APA Zhai, Zhaoyang , Wang, Wenjun , Mei, Xuesong , Wang, Kedian , Wang, Fangcheng , Pan, Aifei . Effect of temporal control of air/water environment on laser drilling of nickel-based alloy with thermal barrier coatings . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2018 , 97 (9-12) , 3395-3405 .
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Effect of Laser Shock Peening on Residual Stress, Microstructure and Hot Corrosion Behavior of Damage-Tolerant TC21 Titanium Alloy EI SCIE Scopus
期刊论文 | 2018 , 27 (9) , 4703-4713 | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
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The effect of laser shock peening (LSP) on the residual stress, microstructure and hot corrosion behavior of damage-tolerant TC21 alloy was investigated. The equilateral scanning pattern was adopted to obtain a large overlapping area for LSP. The hot corrosion experiments in a salt mixture composed of 75wt.% Na2SO4+25wt.% NaCl at 700 and 800 degrees C for a total exposure of 25h were conducted. The results demonstrated that LSP caused a high compressive residual stress with a significant increase in micro-hardness and microstructural changes in the form of crystal defects, i.e., high density dislocations. The crystal defects promoted the outward diffusion of Al, Cr and Ti to form protective mixed oxides (Al, Cr, Ti)O-2. These oxides improved the adhesion of outer oxide layer and hindered the inward diffusion of O, S and Cl, which was beneficial to improve hot corrosion resistance. The mass gains of LSP-treated specimens after hot corrosion at 700 and 800 degrees C were, respectively, 3.72 and 4.78mg/cm(2), which were much lower than those of untreated specimens (5.65 and 6.81mg/cm(2)). Therefore, LSP leads to an improvement in resistance to hot corrosion of TC21 alloy.

Keyword :

residual stress hot corrosion TC21 alloy laser shock peening microstructure

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GB/T 7714 Geng, Yongxiang , Mei, Xuesong , Wang, Kedian et al. Effect of Laser Shock Peening on Residual Stress, Microstructure and Hot Corrosion Behavior of Damage-Tolerant TC21 Titanium Alloy [J]. | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2018 , 27 (9) : 4703-4713 .
MLA Geng, Yongxiang et al. "Effect of Laser Shock Peening on Residual Stress, Microstructure and Hot Corrosion Behavior of Damage-Tolerant TC21 Titanium Alloy" . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE 27 . 9 (2018) : 4703-4713 .
APA Geng, Yongxiang , Mei, Xuesong , Wang, Kedian , Dong, Xia , Yan, Xin , Fan, Zhengjie et al. Effect of Laser Shock Peening on Residual Stress, Microstructure and Hot Corrosion Behavior of Damage-Tolerant TC21 Titanium Alloy . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2018 , 27 (9) , 4703-4713 .
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The Application of Multi-objective Genetic Algorithm in the Modeling of Thermal Error of NC Lathe EI Scopus
会议论文 | 2018 , 67 , 332-337 | 11th CIRP International Conference on Intelligent Computation in Manufacturing Engineering, CIRP ICME 2017
SCOPUS Cited Count: 1
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A modeling method based on multi-objective genetic algrithm (MOGA) for thermal error of NC lathe is proposed in this paper. Firstly, a coupling analysis method on component thermal deformation of the machine tool is used to determine the positions of equivalent temperature measurement points and establish a estimation model of thermal errors according to the physical characteristics of each component. Then one objective function is formulated based on this estimation model while the other one is determined by the testing data of the thermal error experiments. At last MO-GA is applied and a thermal error model with high robustness is obtained. © 2017 The Authors.

Keyword :

MOGA Multi-objective genetic algorithm NAGA-II NC lathe Objective functions Physical characteristics Thermal error Thermal error modeling

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GB/T 7714 Hou, Ruisheng , Yan, Zongzhuo , Du, Hongyang et al. The Application of Multi-objective Genetic Algorithm in the Modeling of Thermal Error of NC Lathe [C] . 2018 : 332-337 .
MLA Hou, Ruisheng et al. "The Application of Multi-objective Genetic Algorithm in the Modeling of Thermal Error of NC Lathe" . (2018) : 332-337 .
APA Hou, Ruisheng , Yan, Zongzhuo , Du, Hongyang , Chen, Tong , Tao, Tao , Mei, Xuesong . The Application of Multi-objective Genetic Algorithm in the Modeling of Thermal Error of NC Lathe . (2018) : 332-337 .
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The Adaptive Fading Extended Kalman Filter SOC Estimation Method for Lithium-ion Batteries EI Scopus CPCI-S
会议论文 | 2018 , 145 , 357-362
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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© 2018 The Authors. Published by Elsevier Ltd. The adaptive fading extended Kalman filter (AFEKF) is proposed for the accuracy and convergent speed problem of state of charge (SOC) estimation. This filter algorithm combines the adaptive extended Kalman filter and fading extended Kalman filter, which solves the problem of uncertainty of system noise and over-reliance on old data. The equivalent circuit model is utilized and the variable forgetting factor recursive least square(VFFRLS) is adopted to identify the model parameters. Experimental test platform is established to validate the method. Results show that the method is able to effectively improve the convergent speed and accuracy of SOC estimation, and the SOC error is less than 2%.

Keyword :

lithium-ion battery state of charge the adaptive fading extended Kalman filter the adaptive Kalman filter

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GB/T 7714 Zhao, Yunfei , Xu, Jun , Wang, Xiao et al. The Adaptive Fading Extended Kalman Filter SOC Estimation Method for Lithium-ion Batteries [C] . 2018 : 357-362 .
MLA Zhao, Yunfei et al. "The Adaptive Fading Extended Kalman Filter SOC Estimation Method for Lithium-ion Batteries" . (2018) : 357-362 .
APA Zhao, Yunfei , Xu, Jun , Wang, Xiao , Mei, Xuesong . The Adaptive Fading Extended Kalman Filter SOC Estimation Method for Lithium-ion Batteries . (2018) : 357-362 .
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