最新刊期
卷 33 ， 期 1 ， 2013
- 摘要：The hot compression simulation of 7055 aluminum alloy was carried out on the Gleeble-1500D thermal simulator.The characteristics of hot compressive structure under different reductions was observed by OM and EBSD.The mechanical properties after heat treatment were tested,and the effects of hot deformation reduction on the microstructure and mechanical properties of 7055 aluminum alloy were investigated.The experimental results indicate that with the increase of reduction,the grains are significantly elongated,and the coarse second phase are stretched along the grain boundaries,and even broken up.Dynamic recrystallization locally occurrs in 7055 aluminum alloy,which is attributed to strain-induced grain boundary migration.With the decrease of the volume fraction of recrystallization and the increase of grain contained sub-structure in 7055 aluminum alloy after heat treatment,mechanical properties of the alloys are improved greatly.The optimum mechanical properties can be obtained with the 79%reduction.关键词：Aluminum Alloy;Reduction;Mechanical Properties;Microstructure
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发布时间：2023-12-18 - 摘要：Because the application of electric pulse inoculation treatment can greatly improve the formation of GP Ⅰ zone of Al-Cu alloy and thus result in the marked improvement in properties of alloy, it is necessary to investigate influence of electric pulse inoculation treatment on GP Ⅰ zone of Al-Cu alloy. Based on the empirical electron theory of solids and molecules （EET）, the formation models of GP Ⅰ zones were built for the Al-Cu alloys which were subjected and not subjected to electric pulse inoculation treatment, and the statistical values of valence electron structure parameters for melts and supersaturated solid solution of Al-Cu alloy were calculated. As a result, the influence of electric pulse inoculation treatment on GP Ⅰ zone of Al-Cu alloy was described at the electron structure level, providing the theory basis for the extensive use of electric pulse inoculation treatment into the aging treatment of Al-Cu.关键词：Al-Cu Alloy;GP Ⅰ Zone;Statistical Value;EET Theory;Electric Pulse Inoculation Treatment
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发布时间：2023-12-18 - 摘要：The microstructure and mechanical properties of the hot extruded Mg-2Ca-5Zn magnesium alloy were investigated by the optical microscope（OM）, scanning electron microscope（ SEM） and universal material testing machine. The results indicate that the fine grains in the extruded Mg-2Ca-5Zn magnesium alloy can be observed,and the Ca2Mg6Zn3 and Mg2Ca phase are dispersedly distributed due to its broken state. Meanwhile,the tensile strength and elongation of the extruded Mg-2Ca-5Zn magnesium alloy are 368MPa and 11.8%,respectively, apparently superior to those of the as-cast alloy.关键词：Mg-2Ca-5Zn Magnesium Alloy;Hot Extrusion;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Magnesium alloy AZ31 sheet was processed by isothermal repeated bending technology （IRBT） at different temperatures. Microstructure and texture as well as properties of magnesium alloy sheet were analyzed. The results indicate that the twinning crystal is the dominant deformation mechanism at 443 K and 483 K, and initial recrystallization grain appears near the twinning boundaries. With deformation temperature of 523 K, initial recrystallization is observed at grain boundaries. For initial magnesium alloy sheet, the elongation is 12.4% and the texture intensity reaches 9.8 at room temperature. When magnesium alloy AZ31 sheet was bended 3 passes at 483 K, the elongation reaches 17.1% and the texture intensity is 5.75 at room temperature.关键词：Magnesium Alloy;Repeated Bending;Texture;Properties
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发布时间：2023-12-18 - 摘要：Combined with the plant informationization integration requirements, a remote monitor system for die casting plant based on OPC technology was described, including system architecture, communication mode, hardware design and software implementation. Monitoring terminals used OPC interface to exchange data with the field device. The human-machine interface was designed using KingView, realizing the functions of remote monitoring and manufacturing management.关键词：OPC;Soft-PLC;Die Casting;Remote Monitor
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发布时间：2023-12-18 - 摘要：Aluminum alloy cooling fin was produced by vacuum negative pressure technology, in which gating area of cooling fin was calculated by the Osann equation, and riser size was presented based on the hot spot circle. The numerical simulation was performed to visualize filling and solidification process to predict the potential position of casting defects, and process was optimized. The simulated results reveal that shrinkage porosity （hole） in the cooling fin can be eliminated effectively as a result of defects transferring into the riser by increasing height of static head and enlarging riser size. The optimized process parameters are as follows:pouring time of 3 s, pouring temperature of 740 ℃, hydrostatic head height of 40mm and nine risers with 10 mm. With the optimized processing parameters, smooth filling with entrapment-gas free and splash free is conducted to realize the sequential solidification and feeding, producing successfully the qualified cooling fin.关键词：Cooling Fin;Numerical Simulation;Sand Casting
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发布时间：2023-12-18 - 摘要：<正>近日,国家镁中心与香港生产力促进局在香港正式签署了共同成立"轻金属工程技术研发中心"合作协议。本中心的成立旨在开发世界轻金属领先技术,应对国家产业政策和企业技术发展的需求,协调双方对于轻金属特别是镁合金方面的技术研发项目申请和实施、研发成果推广及科技成果产
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发布时间：2023-12-18 - 摘要：<正>昆明杨林工业园区百亿装备制造产业布局主力之一的云南浩鑫铝箔项目在2012年12月20日举行了开工仪式。24日,项目投资方云南冶金集团股份有限公司再与园区管委会签订《项目建设补充协议》。项目总投资将超40亿元,预计建成投产后销售年收入为45.6亿元。
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发布时间：2023-12-18 - 摘要：<正>近日,国务院关税税则委员会发布《关于2013年关税实施方案的通知》,镁及镁合金出口关税于2013年起取消,自2013年1月1日起实施。这意味着这项执行了5年的出口政策将发生重要变化。上述关税的取消一大背景是:美国、欧盟、墨西哥针对包括镁在内的9种原材料向WTO提起诉讼,2012年1月,世界贸易组织上诉机构（DSB）就此诉讼发布了裁决报告。有分析人士认为,虽然我国履行一个大国的责任,在出口政策上进行相应的调整以符合WTO规则属被迫之举,但业内对该关税的取消解读为,对国内多数镁企业而言将是重要的利好消息。
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发布时间：2023-12-18 - 摘要：<正>2012年12月12日,河南鹤壁鹤山区姬家山产业园一处工地上,鹤壁明远轻合金科技发展有限公司年产5.5万吨高精度镁合金型材项目在这里举行奠基仪式。中国有色金属工业协会镁业分会会长徐晋湘、秘书长孙前出席奠基仪式并为项目奠基。据了解,该项目总投资15亿元,占地300余亩,办公楼、附属楼及配套楼建筑面积约2.2万平方米,标准钢构厂
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发布时间：2023-12-18 - 摘要：<正>余杭目前单体投资最大的浙商回归重大项目——杭州鼎盛车用轻合金材料项目12月10日在余杭区瓶窑镇崇化高新技术区正式开工建设。杭州鼎盛轻合金材料有限公司"年产20万吨高速列车和车用镁铝合金板带"项目是浙江省2012年的重大工业项目,同时也是2012浙商回归重点项目。该项目总投资12亿元人民币,占地400亩,建设周期为三年。
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发布时间：2023-12-18 - 摘要：<正>总投资200多亿元的青海盐湖集团金属镁一体化项目,各项工程进展顺利,截至2012年10月底,已累计完成投资90多亿元,已从土建施工转向安装阶段,预计到2013年,金属镁、电石、PVC等装置全部达到机械竣工并陆续形成产能。金属镁一体化项目是青海盐湖集团抢抓世界镁工业格局调整及挪威海德鲁公司退出镁行业、出售镁技术的历史性机遇,做大做强盐湖集团的重大战略决策。项目立足察尔汗盐湖并依托柴达木盆地丰富的矿产资源,以金属镁为核心,以钠利用为副线,以氯气平衡为前提,以煤炭为支撑,以天然气为辅助,在盐湖地区构筑"主题鲜明、特色突出"的循环经济产业链,实现盐化工、煤基化工、天然气化工、有色冶炼多产业间融合发展。
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发布时间：2023-12-18 - 摘要：Semi-solid A390 alloy was prepared by near-liquidus process. The microstructure evolution of A390 alloy with varied holding temperature and time was observed with the alloy melt held around the liquidus temperature. The results show that with the holding temperature decreased from 695℃ to 650 ℃, the α -Al phase in the microstructure of the alloy is transformed gradually from dendrite to rosette and then into spherical shape, and the primary Si is converted into refined particle. The uniform refined primary Si particle and nearly spherical α -Al can be obtained in the microstructure of A390 alloy with holding at 635650 ℃ for 4055 min. It is found that with increasing in cooling rate, the primary Si and α phase in the microstructure of the alloy become more refine and spherical, respectively.关键词：A390 Alloy;Semi-solid;Near-Liquidus Process;Microstructure
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发布时间：2023-12-18 - 摘要：The semi-solid 2A12 aluminum alloy prepared by low voltage pulsed magnetic field process was partially remelted, and its microstructural evolution was observed by means of optical microscope and graphical analyzer. The experimental results show that the α -Al grains are coarsened gradually and become more globular with the increase of the isothermal temperature and holding time. For the 2A12 aluminum alloy, primary α -Al grains exhibit uniformly near spherical structure with size of 116120 μm, and liquid phase fraction is approximately 40% at 620 ℃ for 2040 min, suitable for semi-solid thixo-forming. It is found that in the early stage of the whole partial remelting process, the volume fraction of liquid is low and grains are grown up fastly mainly through crashing and fusing, while grains are grown up slowly and spheroidized mainly through elements diffusion as a result of increasing in volume fraction of liquid phase with the increase of the isothermal temperature and holding time.关键词：Low Voltage Pulsed Magnetic Field Process;Semi-solid;2A12 Aluminum Alloy;Partial Remelting;Microstructural Evolution
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发布时间：2023-12-18 - 摘要：A novel continual low pressure die casting technology based on PLC and touch screen was developed due to some disadvantages occurred in the traditional low pressure die casting process, such as low efficiency, poor liquid quality and unstable air pressure. The new equipment is made up of three independent furnaces including holding furnace, pressurizing furnace and up-stream furnace. The three furnaces are connected by the paths located in the bottom of the furnace. Refilling, pressurizing, pouring are fulfilled by the three furnaces, respectively. Pressurizing furnace possesses constant liquid volume and liquid level is kept at the same height before air pressurizing. So the air pressure curve is accurate and stable, and good reproducibility can be achieved for each pouring. Interruption between refilling and pouring through holding furnace can′t observed. Therefore continual production and high efficiency can be guaranteed.关键词：Low Pressure Die Casting;Continual Low-Pressure Die-Casting Machine;Equal Liquid Level;PLC Control System
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发布时间：2023-12-18 - 摘要：The formation mechanism of hot crack in magnesium alloy wheel was analyzed, and effects of indirect squeezing casting on hot crack were investigated. The results show that squeezing casting magnesium alloy wheel exhibits desirable properties with crack free when it is poured at 680 ℃ for 2025 s and filled at 60 mm/s with pressure of 85MPa and preheating temperature of 240 ℃。The hot crack can be reduced significantly through adjusting indirect squeezing processing parameters at a fixed chemical composition and shape structure.关键词：Magnesium Alloys;Wheels;Indirect Squeezing Casting;Crack
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发布时间：2023-12-18 - 摘要：The crack of die casting grid was investigated, and countermeasures were presented. There were many reasons causing the defects of die casting grid, which must be resolved from various aspects. The hot spot easily appears in large thick position （beam place of grid） by computer simulation,which easily forms the crack defects. The simulated result is well in agreement with the actual production. The parameters were presented to the grid with 4.2% Sb to reduce or eliminate the different defects and to ensures the continuity of production process.关键词：Lead-Antimony Alloy;Grid;Die-Casting
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发布时间：2023-12-18 - 摘要：For different pistons, its salt core mold and casting mold have similar shape and configuration. Structure characteristics of piston salt-core mold and casting die were reviewed, and base on UG mold wizard standard part database ,salt-core mold, casting die and 2D-drawing standard part database were established, which could improve the efficiency of the die design,reducing the developing period of new product.关键词：Salt-Core Mold;Piston Casting Die;Standard Part Database;2D Drawing
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发布时间：2023-12-18 - 摘要：Effects of processing parameters such as applied pressure, pouring temperature, die temperature and delaying time on the defects in squeeze-casting Al-Cu alloy were investigated. Experimental results show that there exist two critical applied pressures during squeeze casting. One is the critical pressure PSC, above which shrinkage defects can be eliminated, and the other is the critical pressure PMS, under which macro-segregation can be avoided. The sound castings without shrinkage and macro-segregation defects can be obtained when the applied pressure only is in the range of PSC<P<PMS. With the increase of the applied pressure, the size and numbers of inter-grain eutectic phase and eutectioids are decreased. High pouring temperature can easily result in the formation of gas hole and inclusions in the castings. Meanwhile, it will bring about the macro-segregation and eutectic segregate defects as a result of decreasing PMS. Moderate die temperature and short delaying time before applying pressure are the essential conditions to prepare sound castings without any defects.关键词：Squeeze Casting;Al-Cu Alloy;Defects;Improving Measures
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发布时间：2023-12-18 - 摘要：Aimed at disadvantages of trial and error in traditional die-casting die gating system design, the ProCAST software was used to guide the design of die casting die for faucet handle. Through visualization analysis, reasonable ingate location was determined firstly, and then design of gating system and mould was conducted. Based on above design, the effects of gating system on filling process of faucet handle were eliminated, improving casting quality and shortening the manufacturing period of mould.关键词：Faucet Handle;Gating System;Die Casting Die;Simulation Analysis;Filling
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发布时间：2023-12-18 - 摘要：<正>美国北卡罗来纳州立大学的研究人员制造出可以拉伸至原始长度8倍的电线,在拉伸的过程中电线仍能正常使用。这一成果可以应用于从耳机线到手机充电器电线等各种电线和电子纺织品中。该研究成果发表在最新的《先进功能材料》杂志上。在制作该电线的过程中,研究人员先用一个非
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发布时间：2023-12-18 - 摘要：<正>美铝车轮和运输产品部（AWTP）在中国苏州开设了一个新的生产工厂,此举标志着美铝车轮产品的制造、配送、销售和服务网络将在中国大陆全面展开。新工厂将为中国市场带来美铝公司领先的锻造铝车轮技术,为商用卡车、拖车和巴士供应更轻、更坚固及更省油的车轮产品。该工厂是美铝公司继在北美、欧洲和日本之后,在中国投资兴建的首家车轮产品制造工厂。
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发布时间：2023-12-18 - 摘要：<正>目前,世界各国进行挤压铸造生产的各种液压机大致有1000台,先进的专用挤压铸造设备主要分布在日、美等发达国家,其中日本最多。挤压铸造机大致发展成三类:垂直合模垂直挤压式;水平合模水平挤压式;水平合模垂直挤压式。挤压铸造设备的研发主要集中在以下几个方面:（1）挤压铸造方式从传统的直接挤压和间接挤压单一方式走向复合化,兼有两种方式的优点,形成适用范围更广的新型挤压铸造工艺。又如,与压铸及半固态铸造方式相融合,形成挤压压铸工艺和半固态挤压铸造。（2）浇注方式及浇注系统装置注重提高浇注的自动化水平和改善浇注条件,开发出高精度的液压控制阀和闭环控制的压射系统,建立专用高效的浇注系统。
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发布时间：2023-12-18 - 摘要：<正>就在欧美日通过WTO诉讼对中国稀土政策施压同时,一些产稀土国家,稀土开采重启计划也进入了实质阶段。《经济参考报》记者日前采访业内人士表示,包括马来西亚、澳大利亚等国家在内的稀土矿山开发和冶炼等多个项目运行非常顺利,预计下半年将会陆续投产,主要集中在轻稀土方
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发布时间：2023-12-18 - 摘要：In order to solve the problems occurred in the preparation of wax pattern for complex hollow turbine blade, such as unstable localization of ceramic core, easy breakage of ceramic core and incompleteness of wax pattern surface, a new locating technology with the wax patch based on the optimal locating algorithm was presented. By establishing the locating error transmission function, the criterion for judging the locating completeness of the ceramic core has been founded. Additionally, with the optimal locating algorithm, the dimensional position of the locating points of the ceramic core was calculated accurately. After that, a new location mode has been designed based on was pattern, Finally, a group of wax pattern have been produced for wall-thickness measurement. The result shows that the method presented can solve the problems mentioned above effectively and provide some theoretical guidance for controlling the accuracy of wall thickness hollow turbine blade wax pattern.关键词：Hollow Turbine Blade;Wax Pattern;Ceramic Core;Locating Optimization;Wax Patch
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发布时间：2023-12-18 - 摘要：In the silica sol investment casting process, the large gating system design in investment casting should be checked by the mass flow density, which could solve design of number and area of runner, and prevent over-heating from thin-walled and narrow flow channel. The effective feeding channel could be realized in process of solidification, obtaining the investment castings with sound structure.关键词：Mass Flow Density;Ingate;Gating System;Sol Silicate Mold Shell
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发布时间：2023-12-18 - 摘要：The national standard GB/T 26658-2011, evaluation method of lost foam castings quality, had been issued in June 2011, and will be brought into effect on, Jun, 2012. In order to generalize, propagandize and carry out the standard, and improve the lost foam castings quality, a outline comment was made on some technical indicators in the standard and the quality control of production for lost foam casting process in home, in which the technical indicators were explained to be carried out in lost foam casting enterprises to control the quality of lost foam castings.关键词：Standard;Resolution;Lost Foam Castings Quality;Control
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发布时间：2023-12-18 - 摘要：The main preparation technologies of three dimensional continuous network ceramic/metal composite materials and its preforms were reviewed. The principles and characteristics of various technologies were described. Progress in mechanical properties, thermal properties, friction and wear properties, damping performance and other aspects of the three-dimensional continuous network composites was expounded. In the end, the application prospects and future development trends about the materials were also presented.关键词：Three Dimensional Continuous Network;Ceramic/Metal Composite Materials;Preparation Technologies
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发布时间：2023-12-18 - 摘要：The （Fe,Cr）7C3 particle-reinforced iron matrix composites were fabricated by compounding gray cast iron with chromium wires based on in situ synthesis, in which the （Fe,Cr）7C3 particles were in-situ synthesized through the reaction between Cr from pure chromium wires and C from the gray cast iron. The microstructure of the composites prepared with different reaction time and relative wear-resistance of the composites prepared with different chromium contents were investigated. The results show that the composites are composed of α-Fe, γ-Fe and （Fe,Cr）7C3, in which the （Fe,Cr）7C3 generated is distributed in iron matrix in form of particles and short-rod. With the increase of chromium content , the relative wear resistance of the composites is increased firstly and then decreased. With the chromium content of about 20%, the composites prepared exhibit excellent wear resistance, which is 7 times higher than that of gray cast iron.
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发布时间：2023-12-18 - 摘要：Effects of different Al additions on mechanical properties of Cu-Zr-Ti based amorphous alloy were investigated. The samples prepared exhibit totally amorphous structure by XRD （X-ray diffraction）. With 6% Al addition, compressive strength, fracture strain and micro-hardness of samples reach 2 002 MPa and 6.48% and 767.6, respectively. The compressive fracture of （Cu60Zr33Ti7）94Al6 amorphous alloy was observed. The results show that the improvement of mechanical properties of the amorphology is attributed to amouts of uniformly distributed fine dimples in the fracture restricting the rapid propagation of shearing band.关键词：Amorphous Alloy;Mechanical Properties;Ambient Compression
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发布时间：2023-12-18 - 摘要：Growth of micro-arc oxidation coating on 7A04 aluminum alloy was observed by SEM （scanning electron microscope） and XRD （X-ray diffraction） to understand the phase constituent and morphology of the film at different growth stages. The results show that the coating thickness is increased firstly and then decreased with the increase of oxidized time. The whole growth is departed from the linear behavior. The growth mechanism of the coatings is characterized by 2 stages: in the initial, columnar growth of the coating perpendicular to the substrate surface; in the second stage, planar sputtering and piling up. The coating is mainly composed of γ -Al2O3. The coating exhibits favorable thermal resistance after heating at 550 ℃ for 5 min and shock chilling at room temperature for 23 times.关键词：7A04 Aluminum Alloy;Micro-arc Oxidation;Microstructure;Thermal Shock Resistance
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发布时间：2023-12-18 - 摘要：The Al-Ti-C master alloy containing TiC and Al4C3 was prepared by a liquid-solid reaction. The effects of the Al-Ti-C master alloy additions on the microstructure and mechanical properties of Mg-8Li-3Al alloy were investigated by means of OM （optical microscopy）, XRD（X-ray diffraction）, SEM（scanning electron microscopy） and EDS （energy dispersive spectrometer）. The results show that the optimal addition of Al-Ti-C master alloy into Mg-8Li-3Al alloy is 1.0%. The morphology of large α-phases dendrites is changed into particles, and the sizes of α-phases are reduced with spheroidization. Meanwhile, the tensile strength and the elongation of Mg-8Li-3Al alloy reach 199.28 MPa and 14.60%, respectively.关键词：Mg-Li-Al Alloy;Al-Ti-C Master Alloy;Grain Refinement;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：A ceramic coating on 5083 aluminum alloy was prepared by micro-arc oxidation （ MAO） in silicate solution, and the growth curve of the coating was drawn.The morphology,composition and phase constituent of the MAO coating were analyzed. The corrosion properties of 5083 aluminum alloy sample before and after the MAO surface treatment were evaluated by salt spray corrosion test,potentiodynamic polarization curves and electrochemical impedance spectroscopy （EIS）. In the initial stage,the current density is dropped rapidly and the coating is grown mainly towards the outer surface, and the surface roughness of the coating is increased rapidly. More than 30 min, the current density is decreased slowly and the coating is grown gradually towards the inner layer of coating. The MAO coating on 5083 aluminum alloy consists of γ -Al2O3 and a small amount of mullite （3A2O3·2SiO2） phases, and the mullite mainly appears in the outer layer of coating. Moreover, by microarc oxidation surface treatment, the corrosion current density of 5083 aluminum alloy is decreased by about two order degree of magnitude, and its electrochemical impedance modulus |Z| is obviously increased, improving significantly the corrosion resistance of coated 5083 alloy. In addition, the fitting analysis of EIS shows that the corrosion resistance of the MAO coating is controlled by the compactness of inner layer.关键词：Microarc Oxidation;5083 Aluminum Alloy;Growth Curve;Corrosion;Electrochemical Impedance Spectroscopy
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发布时间：2023-12-18 - 摘要：Commercial W70Cu30 alloy was hot-rolled by multi-pass hot-rolling at different temperatures. The properties of the W70Cu30 sheet were analyzed. The results indicate that W-Cu alloy sheets with 0.2 mm in thickness and relative density of 99.92% can be prepared successfully by the newly technique at 700 ℃. In hot-rolling process, deformation and sliding in both copper and tungsten phases occur as a result of rolling stress, which makes copper phase fill in closely surrounded by tungsten particles to form network-like distribution structure, increasing electrical and thermal conductivity by 23% and 31.31% after hot-rolling, respectively. Induced density and deformation strength also enhance micro-hardness of W70Cu30 alloy sheets. The sheets after hot-rolling consist of two phases-W and Cu. In addition, the fracture mode of the sheet after hot-rolling is characterized by ductile fracture of copper binding phase and trans-granular fracture of tungsten phase.关键词：Hot-rolling;W-Cu Alloy;Fracture Morphology;Sheet
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发布时间：2023-12-18 - 摘要：The structure and composition of the HPb59-1 lead-brass valve blank were expounded, and the origination of crack in the valve blank during hot stamping process was analyzed. Meanwhile, some preventive measures were presented. Based on the structure characteristics of temperature-control valve, the penetration method was determined to detect crack in the valve body samples and batch by color penetration and fluorescence penetration. The practical application shows that the color penetration exhibits desirable detecting effects, providing a reference to valve product company.关键词：Lead-brass Valve;Stamping;Crack;Penetration Detecting
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发布时间：2023-12-18 - 摘要：<正>（同期举办:第七届中国国际铜业展览会）时间:2013年3月6～9日地点:中国·天津梅江会展中心主办单位:中国机械工业联合会中国有色金属加工工业协会振威展览集团承办单位:北京振威展览有限公司地址:北京市朝阳区北苑路170号凯旋城E座8层
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发布时间：2023-12-18 - 摘要：<正>20130101恒川好树,奥宫正洋,本村隆宽,等.基于超声振动的半固态铸造Al-Si-Fe系合金的组织变化及力学特性.铸造工学,2012,84（2）:75-80.基于可持续发展和节能的需要,对于含铁Al-Si回收料的再生利用十分重要。因超声振动方法能对高Fe含量亚共晶Al-7Si合金组织进行细化,故对高频加热到半熔融状态的铝液实施超声处理,然后进行半固态铸造成形,研究了其凝固组织和力学性能。试验合金为Al-7Si-Fe,Fe含量分别为0.04%,0.2%,
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发布时间：2023-12-18 - 摘要：<正>日前,欧盟通过WTO秘书处通报含镉电池和蓄电池投放市场提案。根据提案,自2016年1月1日起,无线电动工具中使用的镍镉电池将在欧盟全面退市。2012年12月17日～19日,国家质检总局标准法规研究中心为此专门在深圳召开专项评议会。记者昨天独家从会上获悉,提案一旦实施,国内四成电池企业面临生死考验。
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发布时间：2023-12-18
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