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Influence of annealing treatment on microstructure and properties of co.d sprayed stainless steel co.tings

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Acta Metallurgica Sinica(English Letters) 2011年第2期24卷 92-100页

作者： Xianming MENG Junbao ZHANG Jie ZHAO Wei HAN Yongli LIANG School of Materials science and Engineering Dalian University of Technology Dalian 116024 China Baosteel Research Institute Baoshan Iron & Steel Co. Ltd. Shanghai 201900 China

304 stainless steel co.tings had been deposited on carbon-steel substrate by co.d spray technique, vacuum annealing treatment was applied to the co.tings with different temperatures, and the influence of annealing treatment on the microstructure and electrochemical behavior of the co.tings in 3.5% NaCl were analyzed. The results indicated that, the co.d sprayed co.ting was co.stituted by the flattened particles, and the interfaces were clearly observed between the deposited particles. It was also found that annealing treatment led to the reco.ery and recrystallization of the elongated grains in the as-sprayed co.tings with the increase of annealing temperature. When the annealing temperature achieved to 950 ？ C, the interface of particles was disappeared and the co.ting s structure was made of new recrystallization austenite grains. Annealing treatment increased the potential volts, and reduced the co.rosion rate with the increase of annealing temperature. The electrical co.rosion morphology indicated that, the co.rosion was firstly at the distortion area and the crevice co.rosion mechanism played an important part. Based on these results, processes active during annealing treatment are kinetically dependent and strongly influenced by the annealing treatment temperature.

关键词： co.d spray 304 stainless steel co.ting Annealing treatment co.rosion behavior

Enhanced photocatalytic co.(2) hydrogenation with wide-spectrum utilization over black TiO_(2) supported catalyst

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Chinese Chemical Letters 2022年第2期33卷 812-816页

作者： Binbin Jin Xin Ye Heng Zhong Fangming Jin Yun Hang Hu School of Environmental science and Engineering State Key Lab of Metal Matrix CompositesShanghai Jiao Tong UniversityShanghai 200240China Center of Hydrogen science Shanghai Jiao Tong UniversityShanghai 200240China shanghai Institute of Pollution co.trol and Eco.ogical Security Shanghai 200092China Department of Materials science and Engineering Michigan Technological UniversityHoughtonMichigan 49931-1295United States

Light-driven co.version of co.(2)into chemicals/fuels is a desirable approach for achieving carbon neutral-ity using clean and sustainable ***,its scale-up application is restricted due to insufficient ***,we present a photothermal catalytic hydrogenation of co.(2)into CH_(4)over Ru/black TiO_(2) catalysts,aiming to achieve the synergistic use of light and heat in solar energy during co.(2)*** to the desirable spectral response ability and photothermal co.version performance of black TiO_(2),an efficient co.bination of photocatalysis and thermocatalysis has been *** co.(2)hydrogena-tion was signiﬁcantly accelerated because of the increased catalyst surface temperature enabled by the photothermal effect of black TiO_(2).Simultaneously,through the in situ X-ray photoelectron spectrosco.y(XPS)observation,electron-rich Ru nanoparticles was achieved based on the photo-induced excitation,thereby providing more negative hydride to improve nucleophilic attack to the co.(2),obtaining the CH_(4) yield of 93.8%.

关键词： Photothermal Black TiO_(2) co.(2) Electron-rich Hydrogenation

Effects of annealing on luminescence efficiency of large-size YAG:Ce crystal grown by temperature gradient techniques

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Chinese Optics Letters 2010年第2期8卷 199-201页

作者：曹顿华赵广军董勤陈建玉程艳丁雨憧邹军 Key Laboratory of Material science and Technology for High Power Lasers Shanghai Institute of Optics and Fine Mechanics Graduate University of the Chinese Academy of science Zhejiang Gemco.e Technology co. Ltd Wenzhou University

YAG：Ce crystal with a diameter of 110 mm is successfully grown by the temperature gradient technique （TGT）. The effects of annealing on the luminescence efficiency of YAG：Ce crystal are investigated, and the optimal annealing temperature and atmosphere are obtained. The mechanism of variation behavior of the luminescence efficiency of YAG：Ce under different annealing co.ditions is discussed and some details on the luminescence associated with co.or centers are analyzed.

关键词： Annealing Cerium Cerium co.pounds co.or centers Luminescence Thermal gradients

Additive manufacturing of hydroxyapatite bioceramic scaffolds: Dispersion, digital light processing, sintering, mechanical properties, and bioco.patibility

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Journal of Advanced Ceramics 2020年第3期9卷 360-373页

作者： Chengwei FENG Keqiang ZHANG Rujie HE Guojiao DING Min XIA Xinxin JIN Chen XIE Instiute of Advanced Structure Technology Bejing Institute of TechnologyBeijing 100081China School of Materials science and Engineering Beijing Institute of TechnologyBejing 100081China School of Materials science and Engineering Harbin University of Science and TechnologyHarbin 150040China shanghai Aircrafi Manufacturing co. LtdShanghai 201324China

Hydroxyapatite(HA)bioceramic scaffolds were fabricated by using digital light processing(DLP)based additive *** issues on the HA bioceramic scaffolds,including dispersion,DLP fabrication,sintering,mechanical properties,and bioco.patibility were discussed in ***,the ffects of dispersant dosage,solid loading,and sintering temperature were *** optimal dispersant dosage,solid loading,and sintering temperature were 2wt%,50vol%,and 1250℃,***,the mechanical properties and bioco.patibility of the HA bioceramic scaffolds were *** DLP-prepared porous HA bioceramic scaffold was found to exhibit excellent mechanical properties and degradation *** this study,DLP technique shows good potential for manufacturing HA bioceramic scaffolds.

关键词： additive manufacturing digital light processing vat photopolymerization hydroxyapatite bioceramic scaffold

Application of kinetics and co.putational fluid dynamics in pinene isomerization

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Chinese Journal of Chemical Engineering 2020年第8期28卷 2111-2120页

作者： Jionghua Xiang Litao Zhu Zhenghong Luo Department of Chemical Engineering School of Chemistry and Chemical EngineeringState Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong UniversityShanghai 200240China

A reliable kinetic model to describe the effects of various factors on the reaction rate and selectivity of pinene isomerization is developed. Furthermore, co.putational fluid dynamics(CFD) is applied to simulate the solid–liquid dispersion in reactor. The catalyst Ti M is obtained by improving the co.position and structure of hydrated titanium dioxide. The kinetic equation of pinene isomerization is deduced based on reaction mechanism and catalyst deactivation model. The kinetic equation of pinene isomerization reaction is fitted, and the results show that the fitted equation is co.related with the experimental data. The rate and selectivity of pinene isomerization reaction are affected by the amount of catalyst, deactivation of catalyst, structure of catalyst, reaction temperature and water co.tent of catalyst. The solid–liquid distribution of the reactor is calculated by co.putational fluid dynamics numerical simulation, and the solid–liquid dispersion in co.mercial scale reactor is more uniform than that in lab-scale reactor.

关键词： Pinene isomerization Hydrated titanium dioxide Kinetics Catalyst deactivation CFD

Ore-proportioning optimization technique with high proportion of Yandi ore in sintering

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International Journal of Minerals,Metallurgy and Materials 2010年第1期17卷 11-16页

作者： Sheng-li Wu Hong-liang Han Hai-xia Li Jian Xu Shi-dong Yang Xiao-qin Liu School of Metallurgical and Eco.ogical Engineering University of Science and Technology Beijing Beijing 100083 China Research Institute （R ＆ D Center） Baoshan Iron ＆ Steel Co. Ltd. Shanghai 201900 China Laiwu Iron and Steel co. Ltd. Laiwu 271104 China

The basic sintering characteristics of Yandi ore from Australia, including assimilation ability, liquid phase fluidity, self-strength of bonding phase, forming ability of silico.ferrite of calcium and aluminum （SFCA）, and so on, were investigated in detail. Besides, the high temperature behavior and function of sintering were obtained. As a result, the techniques for ore-proportioning in sintering were obtained. The results show that Yandi ore possessing higher assimilation ability, better liquid phase fluidity, lower self-strength of bonding phase, and better forming ability of SFCA, should be mixed with iron ores whose properties are opposite to those of Yandi ore. In the optimization of sintering ore-proportioning, Yandi ore, whose price is relatively low, can be mixed as high as 40wt%.

关键词： Yandi ore sintering high temperature behavior proportioning optimization

Wear properties of potassium titanate whiskers-reinforced Al-12Si alloy composites

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China Foundry 2010年第1期7卷 33-36页

作者： Wei Zhongshan Wu Shenqing Hamilton-Sundstrand lndustrial （shanghai） co. Ltd. Shanghai201108 China co.lege of Materials science and Engineering Southeast University Nanjing 210096 Jiangsu China

Potassium titanate （K2O·6TIO2） whiskers-reinforced Al-12Si alloy composites were prepared by the squeeze casting technique. Wear properties of the composites were investigated by pin-on-disc tests under dry co.ditions. The experimental results showed that K20 ·6TiO2 whiskers can effectively reinforce the matrix alloy and improve the wear resistance of the co.posite when the volume fraction of whiskers is low at 10 vol%. However, the composites with a high volume fraction of whiskers showed lower wear resistance than the Al-12Si alloy. The main wear mechanism of the composites is clarified as de-lamination and abrasive wear.

关键词： potassium titanate whisker aluminum matrix composites wear properties

Growth and Characteristics of Tunable Laser Crystals β-Ga2O3∶Cr

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Journal of Rare Earths 2006年第z1期24卷 156-158页

作者： Zhang Jungang Xia Changtai Deng Qun Xu Wusheng Shi Hongsheng Wu Feng Xu Jun shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China Graduate School of the Chinese Academy of sciences Beijing 100039 China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China GE (China) Research and Development Center Co. Ltd. Shanghai 201203 China GE (China) Research and Development Center Co. Ltd. Shanghai 201203 China GE (China) Research and Development Center Co. Ltd. Shanghai 201203 China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China

β-Ga2O3∶Cr single crystals have potential applications for tunable laser. In β-Ga2O3 crystal structure Cr3+ ions are in octahedron other than tetrahedron. So the Cr3+ ions are influenced by low field of β-Ga2O3 that results the 4T2 to 4A2 transition and show broad emission around 690 nm. β-Ga2O3 single crystals doped with different Cr3+ co.centrations were grown by floating zone technique. Their absorption spectra and fluorescence spectra were measured at room temperature. The values of field splitting parameter Dq and Racah parameter B were calculated based on the absorption spectra.

关键词： β-Ga2O3 Cr floating zone technique tunable laser

Two-sided ultrasonic surface rolling process of aeroengine blades based on on-machine nonco.tact measurement

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Frontiers of Mechanical Engineering 2020年第2期15卷 240-255页

作者： Shulei YAO Xian CAO Shuang LIU co.gyang GONG Kaiming ZHANG Chengcheng ZHANG Xiancheng ZHANG Key Laboratory of Pressure Systems and Safety(Ministry of Education) East China University of Science and TechnologyShanghai 200237China AECC co.mercial Aircraft Engine co. Ltd.Shanghai Engineering Research Center for Commercial Aircraft EngineShanghai 201108China

As crucial parts of an aeroengine,blades are vulnerable to damage from long-term operation in harsh *** ultrasonic surface rolling process(USRP)is a novel surface treatment technique that can highly improve the mechanical behavior of *** seco.dary machining,the nominal blade model cannot be used for seco.dary machining path generation due to the deviation between the actual and nominal *** clamping error of the blade also affects the precision of seco.dary *** study presents a two-sided USRP(TS-USRP)machining for aeroengine blades on the basis of on-machine nonco.tact ***,a TS-USRP machining system for blade is ***,a 3D scanning system is used to obtain the point cloud of the blade,and a series of point cloud processing steps is performed.A local point cloud automatic extraction algorithm is introduced to extract the point cloud of the strengthened region of the ***,the tool path is designed on the basis of the extracted point ***,an experiment is co.ducted on an actual blade,with results showing that the proposed method is effective and efficient.

关键词： aeroengine blades on-machine nonco.tact measurement point cloud processing path planning surface strengthening