最新刊期
卷 33 ， 期 12 ， 2013
- 摘要：The bubbles formation and ascending process during rotary pulse process were simulated with water as medium and using high-speed techniques for photography.The results show that the shape of bubbles exhibits spherical structure at initial stage of formation,and the bubble departure diameters are in proportion to aperture of stator disc.The bubbles morphology is changed from initially spherical to elliptic in ascending process which rises along the curve.In the process,the bubbles may present the phenomenon of chasing coalescence growth and collision coalescence growth.关键词：Rotary Pulse;Refining;Bubbles;Law of Motion
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发布时间：2023-12-18 - 摘要：The bubbles movement during refining process of aluminum alloy by rotary pulse ventilation was analyzed,and the motion behavior of bubbles in the liquid was simulated by using the numerical simulation with the model of VOF to analyze the effects of liquid properties on the bubbles formation and ascending process.The results show that the bubbles experience nucleation and growth process.The bubbles exhibit spherical structure at the initial stage of nucleation,and the shape of the bubbles is changed from spherical to ellipsoidal during the subsequent process of detachment and growth.With the increase of viscosity,the shape of the bubbles tends to be spherical,and the curvature running track tends to be straight line.Meanwhile,with the increase of surface tension,the bubbles are increasingly difficult to be deformed,leading to the bubble collapsed later,even not broken.关键词：Rotary Pulse;Refining;Bubble;VOF Model;Numerical Simulation
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发布时间：2023-12-18 - 摘要：The creep behavior of Mg-12Gd-2Y-0.5Zr magnesium alloy at high temperature was analyzed. The results show that the creep resistance of the experimental alloy is generally superior to that of commercial WE54alloy,and the stress exponent（n）is in range of 2.53.8at 200℃and 4.26.1at 300 ℃ under a stress of 5070MPa.The creep mechanisms of the series alloy mainly are controlled by dislocation climbing towards dislocation cross-slip.The creep activation energy（Qc）is 66kJ/mol under 50 MPa and 87.2kJ/mol under 70MPa at 200300℃.With the increase of temperature and stress,creep activation energy of Mg-12Gd-2Y-0.5Zr alloy is near to diffusion activation energy（80kJ/mol）of pure magnesium more and more.关键词：Mg-12Gd-2Y-Zr;Creep Resistance;Stress Exponent;Creep Activation Energy
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发布时间：2023-12-18 - 摘要：The Ni-based coating containing Al was deposited on Cr-Zr-Cu alloy by Nd:YAG laser cladding.Interfacial characteristics and inter-diffusion behavior at the coating/copper substrate interface of the coated Cr-Zr-Cu alloy were investigated by X-ray diffraction（XRD）and scanning electron microscopy（SEM）equipped with X-ray energy dispersive microanalysis（EDX）,as well as transmission electron microscopy（TEM）.The results indicate that the Ni-based alloy coating exhibits metallurgical bonding with copper substrate as a result of chemical heat release between Ni and Al induced by laser.The absence of defects in cladding layer with fine and compact structure can be observed.The microstructure of the coating is composed ofγ-Ni、AlNi3 and Al3 Ni5.（Ni,Cu）solid solution phase is formed at interface, which is responsible for metallurgical bonding by diffusion between Ni-based coating and copper substrate.During the rapid solidification process of molten pool,actual concentration of solid phase near the interface is increased and actual concentration of liquid phase near the interface is decreased as a result of redistribution fo the solute in the molten pool in unequilibrium effects of the laser.关键词：Copper Alloy;Laser Cladding;Ni-Based Coating;Interfacial Characteristics
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发布时间：2023-12-18 - 摘要：Considering the complexity between addictives in the formula and the performance of the ceramic coating prepared by centrifugal self-propagating high-temperature synthesis process（SHS）,the genetic algorithm was used to optimize the parameters of support vector machine,and a model which described the relationship between addictives and the ceramic performance was established by support vector regression.Besides,the model was verified by the tested data.The results show that the maximum relative error of the crushing strengthen of the compound steel-ceramic pipes and the relative density of the ceramic reach 6.2%and 5.2%,respectively,and the accuracy of the model was improved effectively with the parameters of M-SVR model optimized by the genetic algorithm,providing a optimization ways to the formula of ceramic coating.关键词：Multi-Output Support Vector Regression;Centrifugal SHS-Fusion Casting;Genetic Algorithm;Parameters Optimization;Simulation
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发布时间：2023-12-18 - 摘要：According to the relative density change models of sintered ceramic material and grain variation model,sintering temperature and holding time of Al2O3ceramics were identified,and sintering process was presented to determine the optimized parameters.Maximum sintering temperature and holding time are the important factors affecting the performance of sintered composites.The results show that with Al2 O3 +0.2%MgO+0.4%SiO2,molding pressure of 200MPa,and heating from 550℃to 1 000℃for 12min,and then from 1 000℃to maximum sintering temperature with heating rate of 2℃/min as well as at holding temperature 1 600℃for 2hours,ceramic filar guide exhibits desirable microstructure with excellent mechanical properties.关键词：Alumina Ceramics;Sintering Model;Sintering Temperature;Holding Time
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发布时间：2023-12-18 - 摘要：Magnesium composites reinforced with carbon nanotubes,which possess super high strength, modulus and chemical stabilityed,exhibited a higher elastic modulus,hardness,yield strength and tensile strength with a little CNTs addition under the condition of uniformly dispersedly distribution,and the elongation of the composites prepared by squeezing casting was increased significantly,showing great development potentiality.Progress in carbon nanotubes reinforced magnesium composites from processing,microstructure and properties was reviewed.关键词：Magnesium Based Composites;Carbon Nanotubes;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：With the help of CAE technology,through analyzing fatigue strength and creep strength of materials and casting process,effects of working stress,material service life and casting defects on the crack in the cylinder head crack were investigated.Meanwhile,effects of heat treatment,raw materials composition and modification treatment on the crack were analyzed,which provided a reference to eliminate and prevent crack in the cylinder head.The quantitative relationship between secondary dendrite arm spacing（DAS2）and solidification cooling rate with mechanical properties of the cylinder head was described.DAS2 can be achieved quickly by CAE and verified accurately by tested data.The simulated results are well agreement with the experimental ones关键词：Cylinder Head Crack;Casting Analysis;Stress Test;Secondary Dendrite Arm Spacing
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发布时间：2023-12-18 - 摘要：Aiming at gas-entrapment,shrinkage porosity（holes）and cold shut easily occurred in the cylindrical structure of gearbox housing in the process of filling,a design that changing craft structure of the gearbox housing was presented,and two optimized designs were presented.Through improving the design of the gate,decreasing the wall-thickness of some parts and adding overflow slot,the optimal process was obtained by FEM.The castings with defects-free and qualified quality were produced by practical-trial production.关键词：Gearbox Housing;Defects Analysis;Craft Structure;Optimization
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发布时间：2023-12-18 - 摘要：Top side-pouring twin roll casting process was modeled by using the commercial CFD software of Flunent.The whole formation process of the steady melt pool with velocity and temperature distribution was investigated.Two alloys with dramatically different solidifcation ranges,1050Al and Al-10Cu, were considered,respectively.It is found that,the top side-pouring twin roll casting process has the ability to adapt different alloys by adjusting parameters like solidification length,inlet flow and superheat.With considering the relationships between temperature and the viscosity of molten metal and surface tension increase with the temperature decrease,the fluctuation of the melt pool surface is restrained.The difference of the two alloys acted in process and the adjustment of the two alloys were described.关键词：Twin Roll Casting;Top Side-Pouring;Numerical Simulation;Fluent Software
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发布时间：2023-12-18 - 摘要：The 7075 aluminum alloy semi-solid slurry was prepared by ICSPC（inverted cone-shaped pouring channel process）process,combined with temperature homogenization（TH）treatment to make the slurry uniform and to control solid fraction suitable for the follow-up rheocasting.Influence of processing parameters on the microstructure evolution of primaryα-Al during TH treatment was investigated. The results show that the TH treatment can reduce the difference of temperature between the center and the edge in the slurry to meet the rheocasting,meanwhile,microstructure in the semi-solid slurry after TH treatment is spheroidized increasingly.With the heating power in range of 2.06.4kW,as the power increases,the time of TH treatment is decreased,and the size of the primaryα-Al is refined with a slightly decrease of shape factor.However,when the heating power is 10.0kW,as a result of phenomenon of alloy re-melting dramatically and severely coalescence of the grain,spheroidization of the grain in the semi-solid slurry is deteriorated sharply.At a given heating power,as the slurry temperature dropped in range of 628632℃,the size of the primaryα-Al is refined increasingly,and finally a high-quality semi-solid slurry appears.关键词：7075Aluminum Alloy;Semi-solid Slurry;Cone-Shaped Pouring Channel;Temperature Homogenization
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发布时间：2023-12-18 - 摘要：Effects of solution treatment time on microstructure and mechanical properties of thixoformed AZ63Magnesium alloy at 430℃ were investigated.The results indicate that the eutecticβphase in secondarily solidified structures is dissolved into the primaryαphase after solution treatment.The solution treatment of thixoformed AZ63magnesium alloy can be divided into three stages:dissolution of eutectic βphase and coarsening of the particles（<0.5h）,normal growth of the particles（1h12h）,and rapid growth of the particles（24h36h）.In the initial stage of solution treatment,the tensile strength and elongation of the alloy are increased rapidly.As increasing in the solution treatment time,the tensile strength and elongation of the thixo-formed AZ63are increased firstly and then decreased.The tensile strength and elongation reach the maximum values of 341MPa and 17.8%,respectively,with solid solution at 430℃for 12h.The solution treatment process of permanent mold casting is slower than that of thixoforming.关键词：AZ63 Magnesium Alloy;Thixoforming;Solution Treatment;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Differential pressure casting aluminum alloy wheel hub for special vichile was analyzed including chemical composition,heat treatment,microstructure observation and properties test.The results show that differential pressure casting aluminum alloy wheel hub exhibits sound structure and fine grain size with absence of gas hole,shrinkage porosity（holes）.After solid solution at 515℃for 18hand aging treatment at 155 ℃for 6h,tensile strength,yield strength,elongation and hardness（HB）of the wheel hub reach 355MPa,255MPa,7.5%and 122,respectively.关键词：Differential Pressure Casting;Aluminum Alloy Wheel Hub;Sturcture;Mechanical Properties
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发布时间：2023-12-18 - 摘要：In order to obtain the reasonable design of gating system,effects of two kinds of gating systems during filling and solidification on the quality of magnesium alloy radiator were simulated by the Flow-3D software.The results reveal that liquid metal in the gating system with T-shaped runner can be brought out a buffer,and the gating system with T-shaped runner is helpful to pressure transfer due to the last solidification of gating system,which is beneficial for filling completely and reducing the tendency of shrinkage cavity as well as improving the quality of the casting.关键词：Gating System;Magnesium Alloy;Numerical Simulation;Radiator
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发布时间：2023-12-18 - 摘要：Aiming at inclusion and gas holes in sand casting axle box of the bogie for passenger train, semi-solid extrusion forming was investigated.Mould was designed by the Pro/E,and the process was analyzed.Meanwhile,the filling process was simulated by the Ansys software,and the trial-product was conducted.The results indicate that with pressure of 110120MPa,pouring temperature of 1 500 ℃and preheating mould at 400425 ℃,the axle box exhibits clean-smooth surface with sound structure,and defects are eliminated,greatly improving the performance.关键词：Extrusion;Mould Design;Axle Box
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发布时间：2023-12-18 - 摘要：The characteristics,selection of raw materials,contituent design and preparation process of die casting coating for aluminum-magnesium alloy were described.A kind of high temperature resistance coating was fabricated sucessfully using commercial refractory aggregate,carrier liquid,suspension stabilizers,binder,dispersant and other additives according to a certain proportion to add into a container with shearing for 1hour.The dispersedly uniform coating was diluted in the water with ratio of 1to 50, and then added into a high pressure coating sprayer to fabricate the working coating after vibration.The coating has good suspension,paintability,lubrication and adhesive strength,which can increase service life,shorten production cycle关键词：Aluminum-Magnesium Alloy;Die Casting;Coatings;Thermal Insulation Properties
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发布时间：2023-12-18 - 摘要：The filling process for two different gating system schemes of die casting mold for aluminum alloy shroud was simulated by the Flow-3D software to determine the optimized gating system.Through comparing the simulation results in gas-entrapment,surface defects and temperature field,the direct fan-shaped gating system was adopted.According to simulation results of the optimum scheme,a vacuum vent-centralized slag system was designed,showing its availability.关键词：Aluminum Alloy;Gating System;Vacuum Vent-Centralized Slag System
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发布时间：2023-12-18 - 摘要：<正>1模具局部喷涂不良的原因压铸生产过程中为提高模具型腔和型芯的使用寿命,保证压铸件能够顺利脱模,并且有完整清晰的轮廓和光洁的表面,需要向型腔和型芯上喷涂脱模剂,脱模剂喷涂后沉积在型腔表面形成微米级的薄膜,起到降温、润滑、保护型腔和型芯的目的[15]。但是由于模具
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发布时间：2023-12-18 - 摘要：Freight train adaptor product mold and gating-riser system were produced by expandable polystyrene EPS.With hot melt adhesive,cold glue,glue tape or foam mold by self-locking,the product foam pieces,product foam mold and gating-riser pattern were assembled into an cluster of the integration mold.Then the pattern cluster was dipped into the water-based ceramic coating containing organicenrichment and dried,and then it was put into a monomer type flask single to fill and compact with dry quartz sand to form in negative pressure conditions.Combining with a analysis software,the design of gating system was optimized.Using KYKY-2800Btype scanning electron microscope and X-ray liquid nitrogen refrigeration silicon drift spectrometer,casting defects were measured.Origination of the defects and the countermeasures were presented by observing micro three-dimensional morphology of the inclusion and element energy spectrum detection.关键词：Freight Train Adaptor;Lost Foam Casting;Solidification Simulation;Structure Defect;Testing Analysis
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发布时间：2023-12-18 - 摘要：In order to produce investment casting steel components with high-quality,investment casting process was optimized.Based on the characteristics of riser as runner in vestment casting,some ways were adopted,such as setting filter,liquid steel buffer and barbed bleeder.Filling process was simulated by MAGMA Soft with the optimized process,and practical production was conducted.The results show that inclusion &gas porosity,cold shut &cold shot can be eliminated effectively,and surface quality of the investment castings meet the PT requirement.关键词：Filter;Barbed Bleeder;Liquid Steel Buffer;Gating System
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发布时间：2023-12-18 - 摘要：Microstructure and mechanical properties of 6061wrought aluminum alloy prepared by castingforging integrated technology at different forging-starting time were investigated.The results show that the streamline deformation structure at different forging-starting time can be observed in the parts near to the forged head,while the final solidification structure at the middle is flatted and compacted.With the forging-starting time of 34s,the forging force can effectively exert pressure feeding,and make structure compact to eliminate the shrinkage,crack and loose structure.With the increase of forgingstarting time,the curves of the tensile strength and elongation for the alloy both before and after heattreatment are firstly increased remarkably,and then decreased gradually.Tensile strength of the alloy before and after heat treatment reaches 211.1MPa and 368.9MPa,respectively,and the elongation reaches 17.57%and 11.5%,respectively,at the forging-starting time of 4s.关键词：6061Aluminum Alloy;Casting-Forging Integrated Technology;Forging-starting Time
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发布时间：2023-12-18 - 摘要：Through analyzing the co-action of rare earth and copper in the alloy,it is found that the desirable copper content is 1%2%,and the rare earth addition is 0.2%in the high zinc aluminum alloy.In the high zinc aluminum alloy,a minor of rare earth can be well dissolved intoεphases,improving the brittleness ofεphase.Formation of the other phases in high zinc aluminum alloy is related with various Cu/RE ratio.With Cu/RE of 8to 1（1.6% Cu and 0.2%RE）,tensile strength,hardness and elongation of the alloy reach 287MPa,HB103and 6.3%,respectively.关键词：High Zinc Aluminum Alloy;Cu/RE Ratio;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Titanium alloy for seawater pipeline was prepared by unconsumable vacuum electrode arc melting furnace.The microstructure,phase composition and corrosion resistance of the casted and annealed Ti-based alloys were analyzed by means of OM,SEM,XRD and electrochemical methods.The results show that grain size of the casted Ti-based and the annealed alloys are both coarse structure.The microstructure at room temperature is mainly widmanstatten structure containingαphase with flat-shaped or basket-shaped structure.Moreover,the widmanstatten structure contains some net-like boundaryβ phase and Al3 Ti metallic compound.The potentiodynamic polarization curve and related electrochemistry analysis reveal that absence of over-passivation and breakdown phenomenon can be observed for Ti2Al-1Fe-1Mo-1Zr.Thus it can be concluded that the tested Ti-based alloys has a good corrosion resistance in 3.5% NaCl solution.关键词：Titanium Alloy;Widmanstatten Structure;Phase Structure;Corrosion Properties
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发布时间：2023-12-18 - 摘要：It is difficult to calculate pulling stress in cross section of spinning mould metal barrel casing with absence of inner circle size of casting.With a fixed wall-thickness ratio of castings via mould,aiming at analyzing parameters of vertical and horizontal castings and mould,through established calculation method of pulling stress,pulling stress in cross section of metal barrel casing was estimated,and maximum error in calculation was determined.With un-even wall-thickness ratio of castings via mould, error exhibits relatively high.The estimating error rate could be reduced by selecting the estimating value at the partial range of pre-estimating external diameters.关键词：Centrifugal Casting;Metal Barrel Casing;Estimating Method of Pulling Stress
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发布时间：2023-12-18 - 摘要：Dissimilar metal composite 316Lstainless steel/copper composites joint was prepared by a hightemperature vacuum dipping preparation,and the microstructures,tensile properties at room and low temperature,thermal fatigue properties of the copper dissimilar metals composite joints prepared were investigated.The results show that the 316Lstainless steel/copper dissimilar metals composite joints prepared exhibit excellent room and low temperature performance as well as desirable thermal fatigue resistant property.关键词：Metal;Infiltration;Microstructure;Fatigue
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发布时间：2023-12-18 - 摘要：Al and TiC particles reinforced aluminum matrix composites（TiC/Al,TiC/Al-12Si）were prepared by microwave sintering method.The microscopic morphology,phase constituent,hardness and relative density of the samples prepared were analyzed comparatively.The results show that the microstructure and properties of the samples prepared exhibit satisfy with small particle size by microwave sintering.With adding TiC particles,the growth of the matrix grains is inhibited.In TiC/Al-12Si composites prepared by the microwave sintering,TiC is relatively uniformly distributed with existence of the silicon phase in the shape of bar strip and sheet,and a new stable phase Al9 Si can be observed.The morphology and distribution of the reinforced phase TiC are relavant with the different matrix materials.关键词：Microwave Sintering;Aluminum Matrix Composites;TiC Particles;Microstructure;Relative Density
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发布时间：2023-12-18 - 摘要：Al2O3 ceramic fibre reinforced aluminum matrix composites were used to produce piston ring to meet the requirement of piston performance of high power intensity diesel engine.The structure design, fibre pre-treatment,preparation of pre-form and squeezing casting parameters as well as wear resistance of the composites were investigated.The results indicate that Al2O3 fiber pre-treated exhibits rational constituent with few slag ball content,which is beneficial for the forming of fibre pre-form.The squeezing parameters were optimized,and the desirable interfacial bonding can be observed in fibre reinforced position of piston with the optimized squeezing parameters,and fine and compact microstructure in the composites with uniformly distributed fibre and little inclusion are observed too.Wear resistance of the composites ring prepared is superior to that of high Ni cast iron.关键词：High Power Intensity;Piston;Composites;Squeezing Casting
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发布时间：2023-12-18 - 摘要：<正>"描白"镜（见下页）[1]西汉（公元前202年公元9年）直径11.7 cm,高锡青铜此镜的主体图案为L和T形浅浮雕,属西汉时期"规矩"镜。常见的规矩镜其L、T形浮雕周边有凸起线条构成的纹饰,均铸造而成（见图1）。"描白"镜的L、T形浮雕周边却满布银白底色,其上又绘有云纹等十分纤细流畅的白色线条（见图2）。从表面剥
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发布时间：2023-12-18 - 摘要：<正>20131201及川胜成,高桥大树,安斋浩一等.溴化物-碳酸盐混合盐芯的力学与去除特性.铸造工学（日）,2013,85（2）:99-106.水溶性盐芯具有较高的强度,可用于压铸成型。其中KClNaCl-K2CO3-Na2CO3系多元混合物,不添加晶须等强化相即可获得很高的强度。作为氯化盐的替代KBr-NaBr-K2CO3-Na2CO3系混合盐亦有可能拥有同样的力学特性,有必要深入探讨。将纯度为99.5%的KBr、NaBr、K2CO3、Na2CO3按不同比
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发布时间：2023-12-18 - 摘要：<正>2013国际先进材料大会于9月23日在青岛会展中心开幕。国际材联主席高井修（Osamu Takai）,中科院院士、中国科协副主席、中国材料学会理事长黄伯云,青岛市委副书记、市长张新起出席开幕式。张新起在开幕式上致辞。他说,国际先进材料大会在青岛召开,必将推动国际新材料产业加快发展,而且为青岛打造国家级新材料产业基地带来了新的机遇。青岛将与国际材联、中国材料研究学会加强合作,吸引更多的国内外高
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发布时间：2023-12-18 - 摘要：<正>中核阿海珐（上海）锆合金管材有限公司（以下简称"CAST公司"）获法国阿海珐集团（以下简称"AREVA集团"）颁发的新型包壳管生产许可证。此举将填补中核集团核产业链的空白,确保燃料组件原材料供应的经济性和安全保障性,中国核燃料组
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发布时间：2023-12-18 - 摘要：<正>上海11月21日消息,国际铜业研究组织（ICSG）周三表示,全球铜需求2014年料将成长4.5%,主要因全球主要铜消费国———中国的精炼铜需求增加。铜铝铅CNMN.COM.CN锌锡镍,中国有色网,小金属,废旧金属。ICSG秘书长DonSmale在上海参与一项行业会议时表示,中国在该年的表观精炼铜消费料将成长6%。铜铝
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发布时间：2023-12-18 - 摘要：<正>连云港丽港稀土实业有限公司联合常州大学石油化工系、南京工业大学材料科学与工程学院成功研发出国内首个稀土助燃剂。该稀土助燃剂以纳米活性碳、氧化铈为主的催化氧化剂为主要原料,经特殊工艺处理,高度分散,制成改性重油的助燃剂,节能减排效果明显。在同等热值的情况下,加入
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发布时间：2023-12-18 - 摘要：<正>在降低铝电解电耗工作的诸多方案中,降低系统各部位电阻是最直接、最有效的硬性方法,它与工艺参数、电解工人的操作水平基本不存在关联性,简单易行,无副作用,不需固定资产投资,成本及投入产出比极低。当系统电阻降低之后,选择降低电耗的技术路线有两条:一是直接降低电解槽设定电压;二是不降低槽电压而使极距自然提高,从而提高电效、降低电耗。两条路线
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发布时间：2023-12-18 - 摘要：<正>11月2日,记者在营口银河镁铝合金有限公司看到,宽1.5m、厚1.5mm、单卷质量达1吨的AZ31镁合金卷板已经批量生产。这项技术不仅填补了行业空白,还标志着我国在高性能宽幅镁合金板材加工领域走在了世界前列。高性能宽幅镁合金板材是国家战略性新兴产业"十二五"规划中重点发展的轻合金产品,在航天、航空、汽车和其他交通运输领域以及通讯电子行业有着广泛用途,到2015
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发布时间：2023-12-18 - 摘要：<正>电解铝过剩严重2012年我国电解铝产能达2 600万吨,实际产量为2 027万吨,产能利用率约为78%,而这已是2008年以来电解铝产能利用率最高的一年。因此,即便产生短期的供给偏紧,闲置产能也将立即填补空缺。据中国有色金属工业协会预计,2013年,全球的电解铝产能将继续保持增长的态势,而中国将仍是全球产能的增长中心。
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发布时间：2023-12-18 - 摘要：<正>重庆市在镁合金开发应用上又取得重要突破。2013年10月30日,从市级重大科技攻关项目"镁合金冲压成形技术开发及其产业化应用"验收会上获悉,通过对镁合金冲压成形技术进行开发,已成功制造出镁合金笔记本电脑外壳和汽车座椅座盆样品。今后,相关成果将广泛应用于上述领域,为笔记本电脑和汽车"减重"。
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发布时间：2023-12-18 - 摘要：<正>全球大热的3D打印技术领域,武汉抢下一项"世界第一"——拥有全球最大的3D打印机,甚至能用来打印飞机的零部件。在今年新开的3D打印展区,各类打印人像、玩偶的摊点前人流不断。看着激光头下一点点成型的作品,观众都惊叹不已。其中,光谷一家3D打印馆陈列出的人像栩栩如生,营销经理介绍,20cm高的彩色人像售价近4 000元,
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发布时间：2023-12-18 - 摘要：<正>欧盟第七研发框架计划（FP7）提供270万欧元资助,总研发投入380万欧元,由奥地利科技人员牵头,意大利、罗马尼亚和塞尔维亚4国科技人员组成的欧洲HydroWEEE Demo研发团队,利用FP7的最新科研成果,即通过湿法冶金技术（Hydrometallurgical Technologies）采用液体溶剂从电子废弃物,如日光灯管、废电池、阴极射线管、印
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发布时间：2023-12-18 - 摘要：<正>2013年10月,中国铝合金车轮出口额3.12亿美元,出口量6.33万吨,出口单价4.92美元/公斤。截至到10月底,110月中国铝合金车轮出口额29.22亿美元,出口量58.69万吨,出口厂商954家,其中前40位厂商出口总金额23.55亿美元,占该产品出口总金额的80.6%;前100家厂商出口总金额27.98亿美元,占该产品出口总金额的95.7%。出口排名前10位厂家名单
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发布时间：2023-12-18 - 摘要：<正>重庆市市级重大科技攻关项目——"大型铸锻件成形关键技术研究及应用"项目已于近日通过专家验收,并获得9项专利。极大提升了重庆在风电、冶金、船舶、交通等领域的竞争力。该项目由重庆长征重工有限责任公司、重庆大学、重庆理工大学等单位共同完成。针对大型自由锻成形、大型模锻工艺与模具、复杂铸钢件缺陷控制等三个方向进行了关
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发布时间：2023-12-18 -
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