• Table of Content
      20 June 2017, Volume 45 Issue 6 Previous Issue    Next Issue
    For Selected: View Abstracts Hide(Show) Pic
    Numerical Simulation and Experiment Study on Extrusion of AZ31 Magnesium Alloy Tube
    Ying-di SUN, Qiu-rong CHEN
    2017, 45 (6): 1-7.   DOI: 10.11868/j.issn.1001-4381.2015.000635
    Abstract ( 897 ( PDF (9053KB)( 231 Citation

    The extrusion process of typical AZ31 magnesium alloy tube was simulated by using the constitutive model of AZ31 alloys and ALE-based HyperXtrude software. The changes of stress distribution and velocity distribution were analyzed under different conditions, through the adjustment of three structural parameters, including the height, big round corner and gradient of weld chamber. The results show that the pressure near the work zone in the weld chamber decrease with the increase of the height of weld chamber, the maximum value and average value of the pressure in the weld chamber are decreasing with the increase of big round corner of weld chamber, and the pressure in the port holes and weld chamber increases with the increase of the gradient of weld chamber. The minimum variance of metal flow rate is achieved in the height of weld chamber with 16mm, big round corner with 18mm and gradient of weld chamber with 15°. The optimized structure alleviates the issues of stress concentration and non-homogeneous flowing velocity. The final die is proved to be capable of producing the qualified products and the microstructure after extrusion is uniform and fine.

    Figures and Tables | References | Related Articles | Metrics
    Microstructures and Mechanical Properties of Al-7Sn-1.1Ni-Cu-0.2Ti Bearing Alloy
    Zhen-zhong FAN, Yan-cai XIONG, Zheng LU, Gang SUN, Sheng-qiang WANG
    2017, 45 (6): 8-16.   DOI: 10.11868/j.issn.1001-4381.2016.001029
    Abstract ( 662 ( PDF (11359KB)( 141 Citation

    The microstructures and mechanical properties of Al-7Sn-1.1Ni-Cu-0.2Ti alloy were studied by using SEM, EDS, OM and WDW-100KN universal tensile testing machine, the lubricating properties were completed by the disk-pin testing machine. The results show that the solidification shrinkage of alloy is 1.13%; the tensile strength, yield strength, elongation and Brinell hardness in the as-cast state are 191, 147MPa, 15.6% and 34.6HBS, with the executing of low temperature aging and annealing process, the tensile strength increases slightly and the yield strength has no significant changes; the elongation and Brinell hardness exhibit the tendency of increasing firstly and then decreasing. Morphology of eutectic Sn phase that distributes nearby the grain boundary transforms from plate-like shape and bone-shape to lamellar and short rod gradually under the function of the interfacial tension. Due to some eutectic phase melts by absorbing energy from heat treatment process, cavity structure forms around grain boundaries, the average grain size of primary α-Al substrate is 182μm. Comparing with the as-cast and annealing at 340℃ for 6h states, the friction coefficient decreases by 28.6% and 78.6%, together with the wear volume reduces by 157.1% and 471.4% after aging at 175℃ for 10h, the fracture morphology shows mainly intergranular fracture and dimple fracture.

    Figures and Tables | References | Related Articles | Metrics
    Effect of Semi-solid Thixo-extrusion on Microstructures and Mechanical Properties of ZA27 Alloy
    Zhan-yong LIU, Xiao-qing ZUO, Zi-long ZHONG, Wei-wei LI
    2017, 45 (6): 17-23.   DOI: 10.11868/j.issn.1001-4381.2015.000920
    Abstract ( 705 ( PDF (7638KB)( 108 Citation

    Through comparative study with normal casting, the effects of semi-solid thixo-extrusion on microstructures and mechanical properties with modification treatment and heat treatment of ZA27 alloys were studied. The results show that the density of semi-solid thixo-extrusion ZA27 alloy increases by 3% compared to the one obtained by normal casting, fine spherical uniform microstructure is obtained by Sc modification treatment or semi-solid thixo-extrusion, and the best roundness of the globular grains is obtained by Sc modification combined with semi-solid thixo-extrusion. The microstructure of ZA27 alloy by semi-solid thixo-extrusion combined with T6 heat treatment is composed of small α primary phase and (α+η) eutectoid phase, which shows that semi-solid thixo-extrusion can promote the dissolution of ε phase and reduce (β+η+ε) ternary eutectic content. The mechanical properties test indicates that the tensile strength, elongation and Brinell hardness of the ZA27 alloy by semi-solid thixo-extrusion, and after Sc modification and T6 heat treatment, are up to 586.01MPa, 17.57% and 171HB respectively.

    Figures and Tables | References | Related Articles | Metrics
    Microstructure and Abrasion Resistance of In-situ TiC Particles Reinforced Ni-based Composite Coatings by Laser Cladding
    Shi-bang MA, Zhen-wei XIA, Yang XU, Huan-ru SHI, Xu WANG, Yue ZHENG
    2017, 45 (6): 24-30.   DOI: 10.11868/j.issn.1001-4381.2016.001215
    Abstract ( 763 ( PDF (7329KB)( 165 Citation

    Laser cladding of Ni-based Ni60A+x% (SiC+Ti)(mass fraction, the same below) composite powder coating on 45 steel substrate was studied by using the method of preplaced powder. The dry friction and wear experiments of different material coatings were carried out by reciprocating friction wear tester. The microstructure and worn morphology of cladding layers were observed and analyzed by using metallographic microscope, scanning electron microscope (SEM) respectively. The results show that the prepared composite coating with dispersively distributed TiC enhanced particles are obtained in-situ, the size and number of the granular TiC gradually increase with the increase of the composite powder SiC+Ti. When the composite powder SiC+Ti reaches 60%, pores and inclusions defects exist in microstructure. When the composite powder SiC+Ti reaches 48%, wear resistance of cladding coating is the best. The wear behavior of the composite coating is abrasive wear, and the mechanism is micro cutting and extrusion spalling.

    Figures and Tables | References | Related Articles | Metrics
    Preparation and Properties of Ti-TiN-Zr-ZrN Multilayer Films on Titanium Alloy Surface
    Song-sheng LIN, Ke-song ZHOU, Ming-jiang DAI, Qian SHI, Fang HU, Hui-jun HOU, Chun-bei WEI, Jian-wu LIU
    2017, 45 (6): 31-35.   DOI: 10.11868/j.issn.1001-4381.2015.000612
    Abstract ( 644 ( PDF (3647KB)( 147 Citation

    24 cycles Ti-TiN-Zr-ZrN soft-hard alternating multilayer film was deposited on TC11 titanium alloy by vacuum cathodic arc deposition method. The structure and performance of the multilayer film, especially wear and sand erosion resistance were investigated by various analytical methods including pin on disc wear tester, sand erosion tester, 3D surface topography instrument, scanning electron microscopy (SEM), X-ray diffraction (XRD), micro-hardness tester and scratch adhesion tester. The results indicate that the Vickers-hardness of the multilayer film with thickness of 5.8μm can reach up to 28.10GPa. The adhesive strength of these coatings can be as high as 56N. Wear rate of the multilayer coated alloy is one order of magnitude smaller than bare one, which decreased from 7.06×10-13 m3·N-1·m-1 to 3.03×10-14m3·N-1·m-1. Multilayer films can play the role in hindering the extension of cracks, and thus sand erosion properties of the TC11 titanium alloy substrates are improved.

    Figures and Tables | References | Related Articles | Metrics
    Microstructure Design for Reliability of Turbocharger Blade of Cast TiAl Based Alloy
    Chun-lei ZHU, Sheng LI, Ji ZHANG
    2017, 45 (6): 36-42.   DOI: 10.11868/j.issn.1001-4381.2015.001169
    Abstract ( 719 ( PDF (8323KB)( 159 Citation

    Based on the application background of turbocharger wheel, the mechanical properties reflecting the damage resistance of turbocharger wheel blade, including RT ductility and fracture toughness together with residual RT ductility after thermal exposure were analyzed in details for a cast TiAl alloy with the directional lamellar microstructure, and the feasibility of cast process for obtaining this microstructure in the blade was also discussed, upon which a new idea of microstructure design was proposed for the reliability of turbocharger wheel. The results indicate that the directional lamellar structure exhibits excellent RT ductility and fracture toughness, and also can retain relatively higher RT ductility after thermal exposure at high temperature, and these good performances rely on the orientation uniformity of the directional lamellar structure. More importantly, by controlling the cooling condition during solidification and atomic ratio of Ti and Al, this directional lamellar structure with the lamellar boundary nearly parallel to the blade surface can be obtained in the blade of turbocharger wheel. This special structure is good to improve the damage resistance of the blade and the reliability of turbocharger.

    Figures and Tables | References | Related Articles | Metrics
    Microstructure and Creep Property of a GH4169 Nickel-based Superalloy
    Chen LIU, Su-gui TIAN, Xin WANG, Jing WU, Shuang LIANG
    2017, 45 (6): 43-48.   DOI: 10.11868/j.issn.1001-4381.2015.001145
    Abstract ( 728 ( PDF (8270KB)( 141 Citation

    By means of direct aging (DA) heat treatment, creep properties measurement and microstructure observation, the microstructure and creep behaviors of the GH4169 superalloy were investigated. Results show that the microstructure of the alloy consists of γ, γ', γ" and δ phases, and the coherent interfaces exist between the phases. The creep life of the alloy at 660℃/700 MPa is predicted to be 123h, and 39h at 680℃/700MPa. Under the testing temperature and stress range, the creep activation energy of the alloy is calculated to be 588.0 kJ/mol. The deformation mechanisms of the alloy during creep are dislocation slipping and twin deformation. The granular carbides precipitated along the grain boundaries may restrain the slipping of the boundary, which is thought to be the main reason of the good creep resistance. As the creep goes on, the slipping dislocations activated within the grains are hindered and blocked by the boundaries to cause the stress concentration, which may promote the initiation and propagation of the crack occurring along the boundaries perpendicular to the stress axis, when the value of stress concentration is higher than the bonding strength of the boundaries, up to the occurrence of creep fracture. This is thought to be the fracture mechanism of alloy during creep.

    Figures and Tables | References | Related Articles | Metrics
    Thermal Stability of Commercially Pure Ti Processed by 135°ECAP and Swaging
    Xiao-jie SONG, Xi-rong YANG, Xiao-yan LIU, Xi-cheng ZHAO, Lei LUO
    2017, 45 (6): 49-54.   DOI: 10.11868/j.issn.1001-4381.2015.000872
    Abstract ( 579 ( PDF (22455KB)( 122 Citation

    Commercially pure (CP) Ti fabricated by 135° ECAP and swaging was annealed at 100, 150, 200, 250, 300, 350, 400, 450℃ and 500℃ for 1h, respectively. The microstructure and properties of annealed commercially pure Ti were investigated by transmission electron microscopy, scanning electron microscopy, uniaxial tensile test and microhardness test. The results show that when annealing temperature is below 400℃, dislocation density reduces gradually and grain boundary becomes clear, no obvious change occurs in the microstructure, ultimate tensile strength and microhardness decrease slightly and no obvious increase occurs in the elongation; when annealing temperature is above 400℃, recrystallization occurs with the increase of annealing temperature, and the grain size increases obviously, the average size is about 5μm, the ultimate tensile strength and microhardness decrease significantly and elongation increases at the same time. The tensile fracture shows the tensile fracture of annealed commercial pure Ti by ECAP and swaging is ductile fracture. With the increase of annealing temperature, the size and depth of dimples increase.

    Figures and Tables | References | Related Articles | Metrics
    Electrodeposition and Properties of Copper Layer on NdFeB Device
    Yue LI, Li-qun ZHU, Wei-ping LI, Hui-cong LIU, Hai-yang NAN
    2017, 45 (6): 55-60.   DOI: 10.11868/j.issn.1001-4381.2015.001426
    Abstract ( 714 ( PDF (3607KB)( 203 Citation

    To decrease the impact of the regular Ni/Cu/Ni coating on the magnetic performance of sintered NdFeB device, alkaline system of HEDP complexing agent was applied to directly electro-deposit copper layer on NdFeB matrix, then nickel layer was electrodeposited on the copper layer and Cu/Ni coating was finally obtained to replace the regular Ni/Cu/Ni coating. The influence of concentration of HEDP complexing agent on deposition course was tested by electrochemical testing; morphology of copper layer was characterized by SEM, XRD and TEM; the binding force of copper layer and the thermal reduction of magnetic of NdFeB caused by electrodeposited coating were respectively explored through the thermal cycle test and thermal demagnetization test. The results show that the concentration of HEDP has great impact on the deposition overpotential of copper. In the initial electrodepositing stage, copper particles precipitate at the grain boundaries of NdFeB magnets with a preferred (111) orientation. The copper layer is compact and has enough binding force with the NdFeB matrix to meet the requirements in SJ 1282-1977. Furthermore, the thermal demagnetization loss rate of the sintered NdFeB with the protection of Cu/Ni coating is significantly less than that with the protection of Ni/Cu/Ni coating.

    Figures and Tables | References | Related Articles | Metrics
    Effects of Elevated Temperature Treatment on Compositions and Tensile Properties of Several Kinds of Basalt Fibers
    Jing CHEN, Yi-zhuo GU, Zhong-jia YANG, Min LI, Shao-kai WANG, Zuo-guang ZHANG
    2017, 45 (6): 61-66.   DOI: 10.11868/j.issn.1001-4381.2015.001191
    Abstract ( 742 ( PDF (1515KB)( 125 Citation

    Five kinds of domestic basalt fibers were studied for the changes of chemical compositions, physical properties and tensile properties of these fibers before and after 200-800℃ treatment in air atmosphere and in nitrogen atmosphere. These works were done mainly by means of X-ray fluorescence spectrometry and fiber monofilament tensile testing methods in order to understand the elevated temperature resistance of basalt fiber. The experimental results show that the surface of basalt fibers becomes smoother with slightly smaller in diameter and mass reduction at the same time, due to the removal of fiber surface treatment agent after elevated temperature treatment in air atmosphere. Mass fractions of SiO2 and Al2O3 decrease while mass fractions of FeO+Fe2O3, CaO and MgO increase, among which the mass fraction of FeO+Fe2O3 increase the most with the maximum increase of 21%. The monofilament tensile strength of basalt fiber is reduced after 200℃ treatment and the maximum strength retention percentage is 98.3%. The monofilament tensile strength reduces evidently after 400℃ treatment and the maximum strength retention percentage is 64.6%. Moreover, the strength retention percentages of five kinds of basalt fibers are all less than 20% after 800℃ treatment. In addition, the fiber elongation at break decreases with the increase of treating temperature and the elastic modulus increases. Compared with that in air atmosphere, strength retention rate of basalt fiber is higher and tensile properties are more stable in nitrogen atmosphere.

    Figures and Tables | References | Related Articles | Metrics
    Optimization of Preparation Program for Biomass Based Porous Active Carbon by Response Surface Methodology Based on Adsorptive Property
    Hao ZHANG, Xin-jie HUANG, Zhi-fang ZONG, Xiu-yu LIU
    2017, 45 (6): 67-72.   DOI: 10.11868/j.issn.1001-4381.2016.000979
    Abstract ( 672 ( PDF (3392KB)( 167 Citation

    With waste walnut shell as raw material, biomass based porous active carbon was made by microwave oven method. The effects of microwave power, activation time and mass fraction of phosphoric acid on adsorptive property of biomass based porous active carbon in the process of physical activation of active carbon precursor were studied by response surface method and numerical simulation method, the preparation plan of biomass based porous active carbon was optimized, and the optimal biomass based porous active carbon property was characterized. The results show that three factors affect the adsorptive property of biomass based porous active carbon, but the effect of microwave power is obviously more significant than that of mass fraction of phosphoric acid, and the effect of mass fraction of phosphoric acid is more significant than that of activation time. The optimized preparation conditions are:microwave power is 746W, activation time is 11.2min and mass fraction of phosphoric acid is 85.9% in the process of physical activation of activated carbon precursor by microwave heating method. For the optimal biomass based porous active carbon, the adsorption value of iodine is 1074.57mg/g, adsorption value of methylene blue is 294.4mL/g and gain rate is 52.1%.

    Figures and Tables | References | Related Articles | Metrics
    Dynamic Rheological Behaviors of PVC/CPE/CaCO3 Composites
    Xue-feng LI, Da-hua HUANG, Shi-jun LONG, Jian LI, Han LI
    2017, 45 (6): 73-79.   DOI: 10.11868/j.issn.1001-4381.2015.001181
    Abstract ( 609 ( PDF (6015KB)( 131 Citation

    Polyvinyl chloride(PVC)/chlorinated polyethylene(CPE)/calcium carbonate(CaCO3) composites with PVC as the matrix were prepared by using melt compounding method, the dynamic rheological behavior, as well as the mechanical properties of PVC/CPE/CaCO3 composites modified with varied amounts of CPE were studied. The results show that with the increasing content of CPE, the storage modulus and loss modulus increases first and then decreases, while the relaxation index λ1 and relaxation time τ2 exhibit a decreasing trend and an increasing trend, respectively. When the content of CPE ranges from 0phr to 10phr, the impact strength increases by about 133.5%. Through analyzing the dynamic rheological behavior of the composites, it can be inferred that a semi-encapsulated, fully-encapsulated, extra-encapsulated model appears between CPE and CaCO3 particles, which explains the toughening mechanism of CPE in the composites.

    Figures and Tables | References | Related Articles | Metrics
    Effects of Ammonium Phosphate on Structure of Cell and Carb on Layer after Burned of Polyurethane-imide Foams
    Qi ZHANG, Juan LIU, Ying WANG, Xiao-ming SANG
    2017, 45 (6): 80-86.   DOI: 10.11868/j.issn.1001-4381.2015.001125
    Abstract ( 609 ( PDF (10752KB)( 107 Citation

    Using ammonium phosphate as flame retardant, polyurethane-imide foams were synthesized via PI pre-polymer method. The effect of APP on the cell structure, thermal stability and carbon layer morphology were analyzed by polarizing microscope, SEM and TGA. The effect of cell structure change on carbon layer morphology was focused and discussed and the formation process of carbon layer was simulated. The results show that cell diameter drops sharply from 690.25μm to 277.83μm, the foam density increases with the increasing addition of APP; the addition of APP makes char yield increased by 30%; the cell wall and peak respectively expand into rod-like and spherical carbon layer, but the cell films burn into holes. Furthermore, the sizes of rod-like and spherical carbon layer increase, but the holes decrease with the increasing addition of APP.

    Figures and Tables | References | Related Articles | Metrics
    Effects of Cold Rolling Reduction and Initial Goss Grains Orientation on Texture Evolution and Magnetic Performance of Ultra-thin Grain-oriented Silicon Steel
    Rui-yang LIANG, Ping YANG, Wei-min MAO
    2017, 45 (6): 87-96.   DOI: 10.11868/j.issn.1001-4381.2016.000350
    Abstract ( 909 ( PDF (16798KB)( 184 Citation

    The ultra-thin grain-oriented silicon steel strips with a thickness of 0.06-0.12mm were produced by one-step-rolling methods with different Goss-orientation of grain-oriented silicon steel sheets. The effect of cold rolling reduction and initial Goss-orientation of samples on texture evolution and magnetic performance of ultra-thin grain-oriented silicon steel strips was studied by EBSD. The result shows that with the increase of cold rolling reduction and decrease of strips thickness, the recrystallization texture is enhanced after annealing.When the cold rolling reduction is 70%, RD//〈001〉 recrystallization texture is the sharpest, and the magnetic performance is the best. The higher degree of Goss orientation in initial sample is, the better magnetic performance of ultra-thin grain-oriented silicon steel.Therefore, for producing an ultra-thin grain-oriented silicon steel with high performance, a material with a concentrated orientation of Goss grains can be used.

    Figures and Tables | References | Related Articles | Metrics
    Precipitation and Evolution Behavior of Carbide During Heat Treatments of GCr15 Bearing Steel
    Chao MA, Hai-wen LUO
    2017, 45 (6): 97-103.   DOI: 10.11868/j.issn.1001-4381.2016.001092
    Abstract ( 1086 ( PDF (6892KB)( 334 Citation

    The evolution behavior of carbides in GCr15 bearing steels after spheroidization annealing, austenitization quenching and low temperature tempering was investigated by the method of quantitative metallography. Numerical simulations on the dissolution kinetics of carbide size and composition during austenitization were performed by ThermoCalc software. The results indicate that the carbide particles formed after spheroidization annealing have a multimodal distribution whilst their size distribution changes to have a single peak after austenitization and tempering, and Cr content increases slightly after austenitization; the carbide particles appear to have larger size with higher Cr content; C rich austenite is formed during austenitization through solid solution by carbides after spheroidization annealing, and then high carbon martensite is formed after quenching and results in the high hardness; Cr atoms can partition from austenite to carbide during the dissolution of carbide, lead to the increasing Cr content of rest carbide particles; the numerical simulations indicate that the carbide particles with the diameter of 200nm cannot completely be dissolved during austenitization even if its Cr content is close to the nominal Cr content of steel, and the undissolved ones may affect the precipitation of carbides during the subsequent tempering.

    Figures and Tables | References | Related Articles | Metrics
    Numerical Simulation of Columnar Crystal/Equiaxed Crystal Formation Model in a Convection Diffusion-multiphase Transformation System
    Yin-hua HE, Fa-zhan WANG
    2017, 45 (6): 104-111.   DOI: 10.11868/j.issn.1001-4381.2015.000367
    Abstract ( 589 ( PDF (3625KB)( 112 Citation

    The horizontal rapid solidification of Fe-Bi-Mn free-cutting alloys were simulated by using diffusion-governed phase transformation kinetics. The three-dimensional solidification model for a convection diffusion-multiphase transformation system was built. Effects of alloys solidification on solid, liquid and gas phases flow diffusion transformation were considered. The Bi and MnS (free-cutting phases) of alloy columnar crystal/equiaxed crystal formation process were simulated. The results show that columnar crystal/equiaxed crystal formation model of Bi and MnS in alloy solidification is strongly influenced by convection diffusion and multiphase transformation terms; the large multiphase mass transfer rate and small enrichment degree of species easy to form columnar crystal where the convection diffusion term is positive; the small multiphase mass transfer rate and large enrichment degree of species appear at where the convection diffusion term is negative, the tip of columnar crystal breaking is caused by turbulence from convection diffusion and multiphase transformation when the species enriched to some degree, and which becomes the nucleation center of columnar crystal and the equiaxed crystal continues to grow and tends to be stable.

    Figures and Tables | References | Related Articles | Metrics
    Stress Rupture and Precipitation Behavior of TP310HCbN(HR3C) for Supercritical Boilers
    Xu-dong FANG, Yan WANG, Guang-wei FAN, Yan XIA, Zhi-bin WANG, Pei-de HAN
    2017, 45 (6): 112-117.   DOI: 10.11868/j.issn.1001-4381.2015.001068
    Abstract ( 930 ( PDF (7541KB)( 144 Citation

    Using persistent experiment method, combined with Gleeble, hardness analysis, SEM, EDS, TEM and other analytical methods, the hot deformation, stress rupture and precipitation behavior of TP310HCbN heat resistance steel was analysed at 650℃ and 700℃, the results show that:the change of the hardness is not obviously under two different stress rupture temperature; with stress rupture time prolongs, TP310HCbN heat-resistant steel intragranular precipitates from granular into rod-shaped, and presence of wormlike NbCrN rich precipitates and dislocation interactions; Taiyuan Iron and Steel production of TP310HCbN heat-resistant steel at 650/700℃-100000h extrapolation lasting strength meet the standard requirements.

    Figures and Tables | References | Related Articles | Metrics
    Research Progress on Graphene Oxide Nanoribbons Nanohybrids and Graphene Nanoribbons
    Yu-ying ZHENG, Ning-ning CAO
    2017, 45 (6): 118-128.   DOI: 10.11868/j.issn.1001-4381.2016.000353
    Abstract ( 1084 ( PDF (8213KB)( 265 Citation

    Graphene oxide nanoribbons (GONRs) nanohybrids were prepared by combining GONRs and other nanoparticles together via the forms of π-π bond or hydrogen bond. This specific combination form can effectively prevent GONRs accumulation, on the other hand, the introduction of new nanoparticles can bring some special properties to the nanohybrids, which is beneficial to give full play to the comprehensive performance of GONRs nanohybrids in polymer modification and other application areas. In this paper, the preparation methods, properties, and application status of GONRs nanohybrids were reviewed in details. Moreover, the structure characteristics, properties, preparation methods and applications of GNRs (as the GONRs reduction product) were also discussed. The related studies have shown that, design and preparation of GONRs nanohybrids is an effective way to the practical application of GONRs, and GNRs as a special two-dimensional variant of graphene, which inherits excellent electrical properties and thermal conductivity from graphene, meanwhile, the special edge effect shows a broader application prospect.

    Figures and Tables | References | Related Articles | Metrics
    Research Progress on Visible-light Responding ZnO-based Nanocomposite Photocatalyst
    Yan-ru ZHAO, Jian-zhong MA, Jun-li LIU
    2017, 45 (6): 129-137.   DOI: 10.11868/j.issn.1001-4381.2015.001083
    Abstract ( 839 ( PDF (13983KB)( 274 Citation

    In this review, different types and properties, photocatalysis and functional mechanism of ZnO-based nanocomposite were summarized. Besides, the research advances were discussed in applications of visible-light responding ZnO-based nanocomposite in fields of degradation of organic pollutants, photocatalytic hydrogen production and antibacterial agents, and the way of thinking and suggestions for further research on ZnO-based nanocomposite photocatalyst were put forward. With the developing of basic research and application, ZnO-based nanocomposite photocatalyst will be widely used in the fields of high efficiency catalyst, environmental purification, solar energy conversion and so on.

    Figures and Tables | References | Related Articles | Metrics
    Research Progress on Tin-based Anode Materials for Lithium Ion Batteries
    Hao MA, Lei LIU, Jie SU, Xue-sen LU
    2017, 45 (6): 138-146.   DOI: 10.11868/j.issn.1001-4381.2014.001463
    Abstract ( 927 ( PDF (6215KB)( 281 Citation

    The status of development on anode materials for lithium ion batteries in recent years were summarized, focusing on the preparation methods, characteristics, problems and improvement ways of tin-based oxide, tin-based composite oxide, tin-based alloy and tin-based composite, respectively. It indicates that a single approach is difficult to comprehensively improve the performance of the tin-based materials, and an integrated application of various methods such as optimizing the structure, controlling components of the materials, incorporating matrix into the tin-based materials as well as optimizing the reducing agent, binder and electrolyte additives can improve the electrochemical performance of the anode materials. Finally, the research trend in tin-based anode materials is prospected, and also it is pointed out that the tin-based composite materials with graphene as matrix may be one of the most promising research directions for future.

    Figures and Tables | References | Related Articles | Metrics