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Effects of Nitrogen Concentration on Microstructure and Antibacterial Property of Copper-Bearing Austenite Stainless Steels

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Journal of Materials Science & Technology 2008年第5期24卷 781-786页

作者： zhixia zhang Laizhu JIANG Gang LIN Zhou XU School of Material Science and Engineering Shanghai Jiao Tong University Shanghai 200030 China[~echnology Center Baoshan Iron ＆ Steel Co. Ltd. Shanghai 201900 China Technology Center Baoshan Iron ＆ Steel Co. Ltd. Shanghai 201900 China

Austenite antibacterial stainless steels have been found to have wide applications in hospitals and food industries. In recent years epsilon copper precipitation in antibacterial stainless steels has obtained much research interest due to its antibacterial action. The objective of this study was to determine the effects of nitrogen concentration on the precipitation of epsilon copper and antibacterial property. Two kinds of austenite antibacterial stainless steels containing copper and different nitrogen concentration （0.02 and 0.08 wt pct, respectively） were prepared and the microstructures were characterized by a combination of electron microscopy and thermodynamic analysis. A mathematical expression was deduced to predict the effect of nitrogen concentration on the activity coefficient of copper, In（fCu/f^0cu）=0.53524＋4.11xN-0.48x^2N. Higher nitrogen was found to increase the free energy difference of copper concentration distribution between precipitation phase and austenite matrix, stimulate the aggregation of copper atoms from austenite, increase the precipitation amount and consequently enhance the antibacterial property of steel.

关键词： Austenite antibacterial stainless steels Epsilon copper precipitation Nitrogen concentration Thermodynamics analysis Antibacterial property

Many-Objective Optimization-Based Task Scheduling in Hybrid Cloud Environments

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Computer Modeling in Engineering & Sciences 2023年第9期136卷 2425-2450页

作者： Mengkai Zhao zhixia zhang Tian Fan Wanwan Guo Zhihua Cui The School of Computer Science and Technology Taiyuan University of Science and TechnologyTaiyuan030024China The School of Electronic Information Engineering Taiyuan University of Science and TechnologyTaiyuan030024China

Due to the security and scalability features of hybrid cloud architecture,it can bettermeet the diverse requirements of users for cloud *** a reasonable resource allocation solution is the key to adequately utilize the hybrid ***,most previous studies have not comprehensively optimized the performance of hybrid cloud task scheduling,even ignoring the conflicts between its security privacy features and other *** on the above problems,a many-objective hybrid cloud task scheduling optimization model(HCTSO)is constructed combining risk rate,resource utilization,total cost,and task completion ***,an opposition-based learning knee point-driven many-objective evolutionary algorithm(OBL-KnEA)is proposed to improve the performance of model *** algorithm uses opposition-based learning to generate initial populations for faster ***,a perturbation-based multipoint crossover operator and a dynamic range mutation operator are designed to extend the search *** comparing the experiments with other excellent algorithms on HCTSO,OBL-KnEA achieves excellent results in terms of evaluation metrics,initial populations,and model optimization effects.

关键词： Hybrid cloud environment task scheduling many-objective optimization model many-objective optimization algorithm

Metal–Organic Gel Leading to Customized Magnetic‑Coupling Engineering in Carbon Aerogels for Excellent Radar Stealth and Thermal Insulation Performances

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Nano-Micro Letters 2024年第3期16卷 36-52页

作者： Xin Li Ruizhe Hu Zhiqiang Xiong Dan Wang zhixia zhang Chongbo Liu Xiaojun Zeng Dezhi Chen Renchao Che Xuliang Nie Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle Nanchang Hangkong UniversityNanchang 330063People’s Republic of China School of Environmental and Chemical Engineering Nanchang Hangkong UniversityNanchang 330063People’s Republic of China Laboratory of Advanced Materials Department of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials and Collaborative Innovation Center of Chemistry for Energy MaterialsFudan UniversityShanghai 200438People’s Republic of China School of Materials Science and Engineering Jingdezhen Ceramic UniversityJingdezhen 333403People’s Republic of China College of Chemistry and Materials Jiangxi Agricultural UniversityNanchang 330045People’s Republic of China

Metal–organic gel(MOG)derived composites are promising multi-functional materials due to their alterable composition,identifiable chemical homogeneity,tunable shape,and porous ***,stable metal–organic hydrogels are prepared by regulating the complexation effect,solution polarity and curing ***,collagen peptide is used to facilitate the fabrication of a porous aerogel with excellent physical properties as well as the homogeneous dispersion of magnetic particles during ***,two kinds of heterometallic magnetic coupling systems are obtained through the application of Kirkendall ***/nitrogen-doped carbon(NC)aerogel demonstrates an ultra-strong microwave absorption of−85 dB at an ultra-low loading of 5%.After reducing the time taken by atom shifting,a FeCo/Fe3O4/NC aerogel containing virus-shaped particles is obtained,which achieves an ultra-broad absorption of 7.44 GHz at an ultra-thin thickness of 1.59 mm due to the coupling effect offered by dual-soft-magnetic ***,both aerogels show excellent thermal insulation property,and their outstanding radar stealth performances in J-20 aircraft are confirmed by computer simulation *** formation mechanism of MOG is also discussed along with the thermal insulation and electromagnetic wave absorption mechanism of the aerogels,which will enable the development and application of novel and lightweight stealth coatings.

关键词： Metal-organic gels Heterometallic magnetic coupling Radar stealth Thermal insulation Computer simulation technology

In-situ three-dimensional visualization of dynamic tension deformation in ferrite stainless steels

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Baosteel Technical Research 2013年第4期7卷 56-61页

作者： zhang zhixia BI Hongyun LI Xin Stainless Steel Technical Centre Research InstituteBaoshan Iron & Steel Co.Ltd.

An improved three-dimensional （3-D） experimental visualization methodology is presented tor evaluating the fracture mechanisms of ferritic stainless steels by in-situ tensile testing with an environmental scanning electron microscope （ESEM）. The samples were machined with a radial notched shape and a sloped surface. Both planar surface deformation and sloping surface deformation-induced microvoids were observed during dynamic tension experiments, where a greater amount of information could be obtained from the sloping surface. The results showed that microvoids formed at the grain boundaries of highly elongated large grains. The microvoids nucleated in the severely deformed regions grew nearly parallel to the tensile axis, predominantly along the grain boundaries. The microvoids nucleated at the interface of particles and the matrix did not propagate due to the high plasticity of the matrix. The large microvoids propagated and showed a zigzag shape along the grain boundaries,seemingly a consequence of the fracture of the slip bands caused by dislocation pile-ups. The final failure took place due to the reduction of the load-beating area.

关键词： three-dimensional (3-D) visualization microvoids in-situ dynamic tensile testing ferritic stainless steels

High-temperature oxidation behavior of austenitic stainless steel Cr20Ni12Si2RE

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Baosteel Technical Research 2019年第1期13卷 32-37页

作者： zhang zhixia HONG Liu BI Hongyun Research Institute Baoshan Iron & Steel Co.Ltd. State Key Laboratory of Development and Application Technology of Automotive Steels( Baosteel) Ningbo Baoxin Stainless Steel Co. Ltd.

Austenitic stainless steel Cr20 Ni12 Si2 RE was developed for use in hot-end components of automobile exhaust systems,especially in automobiles designed according to the China VI emission standard. The hightemperature oxidation kinetic curve of Cr20 Ni12 Si2 RE at 1 050 ℃ was obtained using the weighting method. The oxidation curves exhibit the parabolic law at 1 050 ℃; after 250 h of oxidation,the mass gain was 22 g/m^2. The morphology,structure,and composition of the oxide film were examined using scanning electron microscopy and Xray diffraction methods. A thin,stable,and dense spinel oxide film obtained after 250 h of oxidation at 1 050 ℃ was mainly composed of( Mn_(0.87)Fe_(0.13))( Mn_(0.13)Fe_(0.87)Cr) O_4 and Cr_2 O_3 with a silicon-containing oxide underneath. The addition of rare earth elements was found to restrict further diffusion of metallic atoms from the austenite toward the oxide film,and consequently,led to a low growth rate of the oxide film. The inner silicon-containing oxide was produced by the diffusion of oxygen atoms and enhanced the coherent strength of the oxide film.

关键词： Cr20Ni12Si2RE automobile exhaust system high-temperature oxidation oxide film

Surface segregation of copper in antibacterial ferritic stainless steel

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Baosteel Technical Research 2008年第2期2卷 55-59页

作者： zhang zhixia Lin Gang Jiang Laizhu Technology Center for Stainless Steel Baosteel Research Institute Baoshan Iron ＆ Steel Co. Ltd. Shanghai 200431 China

By using auger electron spectroscopy （AES） and diffusion theory to analyze the surface segregation of copper in antibacterial ferritic stainless steel, establishing a diffusion model, and calculating the activation energy of diffusion of the copper in ferrite, the affect of surface segregation on the antibacterial capabilities were researched. The results show that the concentration of the copper surface at 973 K and 1 073 K could be expressed asln X^sCu/X^bCu = k0 √Dt/d（-△Hv^Cu＋△Hf^tron＋ △Hs^Cu）/3RT , with the parameters relating to the concentration of the diffusion layer, the coefficient of diffusion, the length of diffusion, the latent heat of evaporation and the latent heat of fusion. The activation energy of diffusion of copper in ferrite is approximately 221. 688 kJ/mol. The antibacterial property of the steel is improved as the surface segregation of the copper is increased. At 1 073 K for 60 min, the concentration of the surface copper is over three times higher than the basic concentration. The antibacterial property of the stainless steel can reach approximately 99.9%.

关键词： ferritic antibacterial stainless steel copper surface segregation diffusion AES

Ag-containing austenitic antibacterial stainless steel

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Baosteel Technical Research 2008年第1期2卷 13-17页

作者： Lin Gang zhang zhixia Shen Jicheng Technology Center for Stainless Steel Baosteel Research Institute Baoshan Iron ＆ Steel Co. Ltd. Shanghai 200431 China

Ag-containing austenitic antibacterial stainless steel was produced by adding Ag-Cu intermediate alloy of different compositions during the melting process. After the Ag-containing austenitic antibacterial stainless steel＇s microstructure, mechanical properties and corrosion resistance were analyzed, conclusions that the antibacterial Ag-enriched phase distributed uniformly in the steel, and Ag-containing austenitic stainless steel had a good antibacterial property in addition to the properties of normal austenitic stainless steel were obtained.

关键词： Ag austenitic stainless steel antibacterial property melting

High-temperature oxidation behavior of heat resistant stainless steel 1.4828

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Baosteel Technical Research 2014年第3期8卷 13-17页

作者： zhang zhixia BI Hongyun LI Xing Research Institute Baoshan Iron & Steel Co.Ltd.

The kinetic curves of the high-temperature oxidation of austenitic heat resistant stainless steel 1. 4828 at 1 050 ℃ were measured using a weighing method. It is shown that the oxidation curves at 1 050 ℃ followed the parabolic line law, and after 250 h of oxidation, the mass gain was about 80 g/m2. The surface morphology and structure of the oxide layers were studied by scanning electron microscopy and X-ray diffraction. A complicated oxide layer obtained at 1 050 ℃ was mainly composed, from inner to outer, of （FeSi） 3 04, Cr2 03, Fe2 03, and spinel oxides FeCr204 and NiMn204.

关键词： 1. 4828 heat resistant stainless steel high-temperature oxidation kinetic oxide layer

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虎耳草精油化学成分及其抑菌活性

西北农业学报 2016年第10期25卷 1536-1540页

作者：张知侠咸阳师范学院化学与化工学院陕西咸阳712000

采用水蒸气蒸馏法提取虎耳草精油,通过气相色谱-质谱联用法(GC-MS)对精油进行成分分析。鉴定出35种化学成分,占总馏出峰面积的78.22%,主要成分为十五烷酸27.93%,(2E,5E)-3,4,5,6-四甲基-2-5-辛二烯6.28%、邻苯二甲酸丁酯辛酯5.54%、9-... 详细信息

采用水蒸气蒸馏法提取虎耳草精油,通过气相色谱-质谱联用法(GC-MS)对精油进行成分分析。鉴定出35种化学成分,占总馏出峰面积的78.22%,主要成分为十五烷酸27.93%,(2E,5E)-3,4,5,6-四甲基-2-5-辛二烯6.28%、邻苯二甲酸丁酯辛酯5.54%、9-十六碳烯酸5.01%。生长速率法测定表明,虎耳草精油对小麦全蚀病菌和番茄早疫病菌的抑制活性较高,在500mg/L剂量下抑制率均在90%以上;对玉米大斑病菌和油菜菌核病菌在750mg/L剂量下的抑制率在80%以上,而对其他几种病菌的抑制率相对较低。

关键词：虎耳草精油化学成分抑菌活性