最新刊期
卷 36 ， 期 2 ， 2016
- 摘要：TiO2 coating was prepared on biomedical Mg-Zn-Y-Nd alloys by DC magnetron sputtering.Effects of TiO2 coating on the degradation rate and degradation behavior of magnesium alloys were investigated in Kokubo’s simulated body fluid（SBF）.The results show that the degradation rate of Mg-ZnY-Nd alloys is 1.39mm/y and 0.61mm/y,respectively,before and after surface modification treatment by the TiO2 coating.The degradation uniformity of Mg-Zn-Y-Nd alloys is improved significantly as a result of the protection of TiO2 coating.The change of TiO2 coating after 24 himmersion in simulated body fluid is absent,and the Mg alloy substrate is not degraded in this period.Up to 72 himmersion,the TiO2 coating is destroyed partly due to the generation of hydrogen and other degradation products,and the TiO2 coating began to be peeled from substrate.Most of TiO2 fragments can remain on the surface of substrate after 336 h,leading to a slower degradation of magnesium alloy.
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发布时间：2023-12-18 - 摘要：A tensile testing was carried out for extruded AZ31 magnesium alloy along extrusion direction at 25 ℃to 100℃,and strain rate from 3×10-2 to 3×10-3 s-1.The generation condition and its mechanism of strain hardening at second stage were described.The results show that occurrence of strain hardening at second stage can be observed at temperature of below 75℃,and strain rate more than 10-2s-1,where the strain hardening rate reaches up to 2 4002 650 MPa,which is attributed to the increase of dislocation density and its accumulated rate due to yield stress increases when tensile testing was carried out at low temperature and high strain rate.The second stage strain hardening can be observed with dislocation density more than 4.62×1016 m-2.关键词：Magnesium Alloy;Second Stage Strain Hardening;Dislocation Density
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发布时间：2023-12-18 - 摘要：The dynamic recrystallization（DRX）behavior of ultra-high strength AerMet100 steel during hot compression test was simulated at 8501 150 ℃ and 0.0110s-1 on a Gleeble-3500 thermo-mechanical simulator.The results show that the AerMet100 steel shows a working hardening,dynamic recovery（DRV）and dynamic recrystallization（DRX）behavior,respectively,under different deformation conditions.Meanwhile,the increase of temperature and the decrease of strain rate are beneficial to dynamic recrystallization.The constitutive relation,DRX critical strain model and DRX kinetics model were established by analysis of the experimental data of hot deformation.The DRX kinetics model predicts that the decrease of deformation temperature and the increase of strain rate can postpone occurrence of DRX.关键词：Ultra-high Strength Steel;Dynamic Recrystallization;Constitutive Relation;Kinetics
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发布时间：2023-12-18 - 摘要：Time via temperature transformation curve of TC21 was investigated by simulation calculation using JMatPro software.Then the double annealing treatment of TC21 alloy was designed by time-temperature transformation curve.The results show that lamellarαphase is precipitated with the different temperature annealing treatment at a fixed deformation rate.The size ofαphase is increased with the increase of temperature.When the annealing temperature exceeds the phase transition point,Widmanstatten structure appears in the microstructure as a result of over-heating.The TC21 titanium alloy can not only generate the basket network structure but also retain some characteristics before annealing after secondary annealing.By observing the alloy microstructure after double annealing,fine sub-secondaryαphase is precipitated in theβmatrix,and the size of sub-secondaryαphase is increased with the temperature increase,which plays a certain role in microstructure and mechanical properties of the TC1 alloy.关键词：TC21 Titanium Alloy;JMatPro Software Simulation;Annealing;Microstructure Evolution
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发布时间：2023-12-18 - 摘要：To overcome the poor leachability of the sand cores of complicated thin-walled magnesium alloy castings,a novel equipment with efficient cleaning was designed.The cleaning equipment is integrated with chemical dissolution,vibration crushing and ultrasonic cleaning,which can be used for three different kinds of cleaning methods:dissolve vibration cleaning,ultrasonic cleaning,dissolved vibration and ultrasonic compound cleaning.Effect of the three cleaning methods on cleaning efficiency of the sand cores were analyzed comparatively.The results show that the cleaning efficiency of dissolved vibration and ultrasonic compound cleaning process exhibits desirable,and the sand core of casting magnesium alloy can be cleaned completely by using the optimized process:5% NaOH concentration,2/18πeccentric block angle,600 W ultrasonic power.关键词：Ultrasonic Cleaning;Vibration;Dissolution;Sand Core
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发布时间：2023-12-18 - 摘要：The hydraulic simulation experiment of the 1∶2six-strands continuous casting tundish was carried out with the hollow glass bead by velocity and inclusion removal efficiency measurement to understand effect of the position change of the long nozzle on the flow field,the RTD curve and the removal efficiency of inclusion in the tundish.The results reveal that when the vertical distance from the long nozzle to the six outlet connections is increased from 800 mm to 1 000 mm,the flow field in the inlet section is similar,while plug volume fraction of the tundish is increased with the removal efficiency of inclusion increased by 28.76%,improving the metallurgical quality of tundish.关键词：Tundish;Flow Field;Inclusion;Dead Volume Fraction
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发布时间：2023-12-18 - 摘要：A novel technology of powder thixoforming for preparing the particle-reinforced aluminum matrix composites in semi-solid state was proposed based on powder metallurgy and thixoforming.The microstructure and mechanical properties of the SiC particle reinforced Al-Cu-Mg alloy composite were investigated,which was compared with those of the matrix alloy.Electrochemical dissolution was employed to obtain the interfacial reaction products.The in-situ tension under scanning electron microscope was used to observe the cracking propagation.The results indicate that the ultimate tensile strength of the thixoforged composites is improved apparently while the elongation is decreased.The interfacial product is MgAl2O4.The crack propagation path during tensile testing is different in thixoforged composites and matrix alloy.关键词：Powder Thixoforming;Electrochemical Dissolution;In-situ Tension;Cracking Propagation;Al-Cu-Mg Alloy
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发布时间：2023-12-18 - 摘要：In order to understand effects of aging temperature,load,frequency on the hardened layer depth of high manganese steel during impact process,Abaqus software was employed to simulate highmanganese steel impact process.The results reveal that with the aging temperature increase,the equivalent plastic strain and the depth of hardened layer are decreased,while with the increase of impact frequency and load,the equivalent plastic strain and the depth of hardened layer are increased.关键词：High-Manganese Steel;Aging Temperature;Load;Frequency;Hardened Layer Depth
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发布时间：2023-12-18 - 摘要：It is important for the former tank’s level control precision to ensure the quality of the aluminum cast rolling.For the characteristics of nonlinear,multi-disturbance and time delay of the former tank’s level control,due to the lack of adaptability,the traditional PID control often can’t meet the designed accuracy requirements.Therefore,a method of parameter self-adjusting fuzzy PID control was presented.The method adopts fuzzy reasoning to online adjust PID parameters to realize the better control accuracy in different conditions of liquid level control system.Simulink simulation result reveals that the fuzzy PID control can improve significantly the dynamic and static characteristics of the system with the small overshoot,the fast response and the short adjustment time.关键词：Liquid Level Control;PID Control;Fuzzy Control;Simulation
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发布时间：2023-12-18 - 摘要：The finite element model of equal channel angular extrusion was established by Ansys software,and the ECAE processes were simulated with different die angles based on the model established.The change of the friction stress,internal stress and strain of the specimen with the die angle were observed.A commercial AZ31 magnesium alloy was subjected to equal channel angular extrusion process.The simulated results were compared with the experimental ones.The results reveal that a larger friction stress is formed during ECAE process on the surfaces of sample and extrusion die,which is responsible for the un-even distribution of the stress and the strain.The friction stress,internal stress and strain of the materials are decreased with the increase of the angle of the die.The grains in the alloy can be refined after ECAE.The theoretical analysis are in agreement with the experimental ones.关键词：ECAE;Finite Element Analysis;Friction Stress;AZ31Magnesium Alloy
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发布时间：2023-12-18 - 摘要：Semi-solid rheological slurry of ZCuSn10 copper alloy was prepared by strain induced melt activation（SIMA）based on cold rolling and remelting method.The influence of the forming specific pressure and extrusion rate on the microstructure of semi-solid ZCuSn10 copper alloy slurry prepared was investigated to understand the evolution law of solid and liquid phases during the forming process.The results indicate that the microstructure of the extrusion parts becomes uniform with the acceptble solid-liquid synergy liquidity with the forming specific pressure of 150 MPa and extrusion rate of 14mm/s.The microstructure of the semi-solid extrusion parts at different position is different at the same extrusion conditions.The microstructure of near punch position keeps the initial semi-solid microstructure.The microstructure of the sample at middle position belongs to semi-solid microstructure with solid-liquid two-phase and high roundness solid particles.The microstructure of sample at the front end is liquid phase with low distribution uniformity of the solid-liquid two phase.关键词：ZCuSn10Copper Alloy;Rheological Extrusion;Microstructure Evolution
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发布时间：2023-12-18 - 摘要：A tilt pouring method to preparing semi-solid slurry has been developed.Critical tilting angle speed was determined by AnyCasting software,and effects of pouring temperature,mould materials and mould wall thickness on the thermal balance between molten alloy and mould were investigated.Finally,experiments were carried out to compare with simulated results.The results reveal that with increasing the tilting speed more than 18（°）/s,the flowing speeds of molten alloy are higher than 0.5m/s with occurrence of unzipping wave.However,with decreasing in the tilting speed lower than 6°/s,the flowing speeds of molten alloy are lower than 0.5m/s with disappearance of unzipping wave.It is found that the thermal balance between molten alloy and mould are closely related with pouring temperature,mould materials and mould wall thickness.The influencing degree sequence is presented as follows:mould wall thickness> pouring temperature> mould materials.关键词：Tilt Pouring;Numerical Simulation;Semi-solid Slurry
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发布时间：2023-12-18 - 摘要：The priduction of heat radiating shell of ultrathin-walled aluminum alloy radio filter with the heat sink in range of 0.81.0mm,was investigated by the RSF rapid slurry forming of semisolid die casting with the help of the MAGMA simulation software to analyze the forming process of semisolid die casting.And influence of different value of low/high injecting velocity and high speed switching positions on the flow and filling of semi-solid slurry was analyzed.The result reveals that with the low injucting velocity of 0.1m/s,the high injecting velocity of 3.5m/s and the high speed switching position of 720 mm,it can be satisfied for the technical shaping requirements of the heat radiating shell of ultrathin-walled aluminum alloy radio filter.And the process parameters were verified by the actual production.关键词：RSF Semi-Solid Die-Casting;Heat Radiating Shell of Filter;CAE Flow Analysis
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发布时间：2023-12-18 - 摘要：Development process of die casting high strength long hydraulic steering housing was introduced.Aiming at the housing features,origination of defects formation was described,and countermeasures of eliminating defects were presented.Furthermore,process optimization was carried out by the MAGMA software.Finally,trial-production and bacth of production were conducted.关键词：Hydraulic Steering Long Housing;Magma Software;Partial Squeezing
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发布时间：2023-12-18 - 摘要：The indirect squeeze casting process and working principle of mold were determined based on analysis of the structure of gearbox and forming technology.During the stage of trial-mold,cold sandwich and shrinkage porosity were observed in gearbox produced by vertical squeeze casting machine SCV2000.After optimization of squeeze gearbox mold design,the defects such as cold sandwich and shrinkage porosity near sprue can be eliminated by optimizing structure of sprue bush and adding local pressurization core.Then the microstructures and mechanical properties of gearbox have been investigated.The results reveal that tensile strength,elongation and hardness of gearbox reach up to 317 MPa,6.1%,99 HBS,respectively,meeting the use requirement.The X-ray flaw detection shows that the aluminum alloy gearbox exhibits satisfy surface quality with absence of shrinkage porosity and cavity,gas hole.关键词：Aluminum Alloy Gearbox;Squeeze Casting;Optimization of Mold Design
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发布时间：2023-12-18 - 摘要：The communication interfaces supported by some remote monitor system include OPC interface,DDE interface and ODBC interface.After comparison,OPC interface was regarded as the most suitable one for the communication between system and external programs.In order to develop the client of the remote monitoring system,OPC automation interface specification and three methods of data access were analyzed.Finally,client of the remote monitor system was developed through OPC interface and programming language Visual Basic.After installing the software,computers in the network could exchange data with the remote monitor system to display the status of the die casting unit.关键词：OPC;Client;Monitor System;Die Casting
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发布时间：2023-12-18 - 摘要：Misrun defects can be generated easily in some investment casting bracket,which is attributed to the last filling and first solidification at the misrun position.Misrun defects can be eliminated effectively in the investment casting bracket by some measures,such as increasing shell temperature and pouring temperature,covering warm-keeping fibre at shell surface easily generated misrun as well as reducing shell layer to improve the permeability of shell mold.关键词：Investment Casting;Misrun;Permeability;Warm-keeping Fibre
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发布时间：2023-12-18 - 摘要：Through an analysis of investment castings of typical titanium alloy（Ti-6Al-4V）parts with slender structure by both methods of computer simulation and actual production,effects of titanium alloy part structure on the casting technique were expounded.The correspondence between computer simulation and actual results at different stages was compared to understand the positive guidance and limitation of computer simulation on castings technique.The results show that various casting techniques have little effect on the mold filling process,and the main difference appears on the inside defection at local position.There are limitations on the casting technique according to experience of typical structure.The computer simulation for shrinkage cavities are consistent with actual ones,while the results of gas defection are weak.And the final casting technique needs the optimization of both computer simulation and actual results.关键词：Computer Simulation;Ti-6Al-4VAlloy;Investment Casting;X-ray Inspection
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发布时间：2023-12-18 - 摘要：The mechanical vibration was applied on the AZ91 Dmagnesium alloy prepared by the expendable pattern shell casting,and effects of pouring temperature,vibration frequency and amplitude on microstructure of AZ91 D magnesium alloy prepared were investigated.The results show that the dendritic structure is reduced significantly by the mechanical vibration,and microstructure of AZ91 D magnesium alloy is refined with decreasing in the pouring temperatures,however,over-low pouring temperature is weaken to mechanical vibration to play the best effect,and a favourable microstructure of AZ91 D magnesium alloy can be observed at 730 ℃,and grains exhibit equiaxed structure.With the increase of vibration frequency,the microstructure of AZ91 D magnesium alloy is refined gradually.When the vibration frequency is 100 Hz,grain size of the primaryαphase is only 166.4μm,and theβphase is distributed in form of fine granular shape.The microstructure of AZ91 D magnesium alloy can be refined with the decrease of the vibration amplitude.When the amplitude is 1.0mm,the fine and spherical grain can be prepared.关键词：Mechanical Vibration;Expendable Pattern Shell Casting;Microstructure;Magnesium Alloy
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发布时间：2023-12-18 - 摘要：Aiming at large beam blank with size of 750 mm × 450 mm × 120 mm,the ANSYS software was used to establish the heat transfer,solidification and shrinkage model in the mold of the beam blank and the thermo-mechanical coupling model of the mould copper plate.Influence of casting speed on the contraction of beam blank,temperature and deformation of the copper plate was analyzed to determine the reference taper of the copper plate,which provides a basis for the mould taper design of beam blank.关键词：Continuous Casting;Beam Blank;Mould;Temperature Field;Taper
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发布时间：2023-12-18 - 摘要：By utilizing Olympus dsx 500 optical microscope to observe the default on polished surface of7A09 aluminum alloy,effects of ultrasonic field on microstructure of 7A09 aluminum alloy were analyzed by introducing ultrasonic or not vibration-transfer tool rod.The results reveal that oxide inclusions are decreased dramatically with ultrasound treatment,and the number of defaults is increased from 2 912to3 436 while the average area of default is decreased from 0.40mm2 to 0.36mm2 with the average size of defaults decreased from 10.0μm to 7.4μm,compared with those of aluminum alloy without ultrasonic treatment.Finally,the mechanism of the effect of ultrasound on defects such as oxide inclusion,bifilm,grain size,was described.关键词：Oxide Inclusions;Grain Size;Microscopic Defects;Ultrasonic Process
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发布时间：2023-12-18 - 摘要：Aiming at the possible cracks,deformation and other casting defects caused by casting-rolling continuous forming process,it was investigated for influences of different high temperature on the thermal stress and strain of the casting ring at the same external environment and effects of environmental temperature and heat exchange coefficient on thermal stress and strain of casting ring at the same high temperature.The results show that the inner surface frontier and the central position of the ring can generate a large principal stress and large deformation,resulting in occurrence of crack.In addition,effects of heat exchange coefficient on casting stress are the greater than those of the ambient temperature.After taking the heat preservation countermeasures for casting removed from the model,thermal stress and deformation of the casting are greatly reduced,and tendency of the cracks is reduced obviously.关键词：42CrMo;Centrifugal Casting;Hot Temperature Demolding;Crack
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发布时间：2023-12-18 - 摘要：Al2O3 particulate reinforced copper matrix composites were prepared by mechanical alloying combined with powder metallurgy technique.The corrosion rate of the composites was tested by mass loss under different acid corrosion solution,and the sample surface morphologies were observed by SEM.The results show that the corrosion rate of the composites prepared is increased obviously with increasing in the medium temperature and the acid concentration.The corrosion resistance can be improved by fully refining Al2O3 particles and appropriately prolonging ball milling time.关键词：Al2O3/Cu Composites;Powder Metallurgy;Hydrochloric Acid;Corrosion Resistance
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发布时间：2023-12-18 - 摘要：The ZL101 matrix composites reinforced by nano-SiC particles were fabricated by high energy ball milling combining with stirring casting technology.The near spherical SiCp/Al composite particles with 0.5to 1.5mm in diameter and nano-SiC uniformly distributed were prepared by high energy ball milling with dry grinding method.Then,0.5% nano-SiCp/ZL101 composites were fabricated with remelting,diluting the near spherical SiCp/Al composite particles into Al-Si alloy melt and stirring casting.Under the forming pressure of 100 MPa,the as-cast tensile strength and elongation of the composites prepared by squeeze casting reach 233.3MPa and 5.27%,increased by 10.94%and 2.73%,respectively,compared with those of ZL101 alloy.关键词：High Energy Ball Milling;Dry Grinding;Compound Particle;Nano-SiCp/ZL101Composites
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发布时间：2023-12-18 - 摘要：Aiming at metal matrix coarse particle reinforced composite block,adopting qualitative and quantitative analysis method,four evaluation indicators of mixing degree,partial agglomeration degree,dispersion rate and combination rate were put forward to characterize quantitatively the uniform degree of particle distribution,the particles segregation in the matrix and the binding of particle and matrix.The high chromium cast iron matrix of ZTA coarse particles reinforced wear-resistant composite block was characterized by the proposed evaluation indicators.The results show that these indicators can describe the compound effect of metal matrix coarse particle reinforced composites accurately.关键词：Metal Matrix Composite Block;Ceramic Particles;Compound Effect;Quantitative Characterize
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发布时间：2023-12-18 - 摘要：The microstructure and mechanical properties of the Mg-10Er-2Zn-0.6Zr alloy were investigated by means of optical microscope（OM）,X-ray diffraction（XRD）,scanning electron microscope（SEM）and mechanical tests.The results reveal that as-cast Mg-10Er-2Zn-0.6Zr alloy is mainly composed ofα-Mg dendrite and interdendritic long period stacking ordered（LPSO）phases and Mg3（Er,Zn）phases.After solution treatment at 500℃for 20 h,both LPSO phase and Mg3（Er,Zn）disappear and in turn a new W（Mg3Er2Zn3）phase can be observed along the grain boundaries.During the following cooling in the furnace to 400 ℃,the LPSO lamella structure is parallel to each other precipitated within and throughout theα-Mg grains.The solution-treated alloy exhibits the desirable mechanical properties,where yield strength,tensile strength and elongation reach 117 MPa,227MPa and 17.9%,respectively.However,the compressive properties are superior to those of tensile ones.关键词：Magnesium Alloy;Mg-10Er-2Zn-0.6Zr;LPSO Phase
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发布时间：2023-12-18 - 摘要：Al-10 Fe alloy was prepared by plasma injection method.Effects of Ni addition on microstructure and mechanical properties of Al-10 Fe alloy were investigated by XRD,metallographic microscope,Vickers hardness tester and tensile testing machine.The results show that the Al-10 Fe alloy produced by plasma injection method consists ofα-Al and Al3 Fe,and the addition of Ni can eliminate need-like eutectic Al3 Fe to generate mesh Al5 FeNi,and it can refine theα-Al grain and decrease primary crystal Al3 Fe particle size,so tensile strength,elongation and Vickers hardness of the Al-10 Fe alloy are improved,and the optimum Ni addition is 1%.关键词：Al-Fe Alloy;Microstructure;Mechanical Properties;Plasma Injection Method
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发布时间：2023-12-18 - 摘要：Thin strip of industrial pure 1050 aluminum alloy was produced by top side-pouring twin-roll casting process,and its microstructure was observed.The results show that the as-cast 1050 strip exhibits satisfy in surface appearance with little defect.The thickness of the strip is increased with the increasing length and then to be stable.The microstructure observation reveals that apparent difference in the microstructure can be observed between the upper roll and lower roll sides.On the upper roll side,the microstructure belongs to solidification structure with equiaxed growth,while on the lower roll side,the microstructure is the rolling deformation structure.In addition,there exists a boundary line at the middle,which is attributed to the improvement of heat transfer condition caused by rolling force.关键词：Twin-roll Casting;Microstructure;Heat Transfer Behavior;1050Aluminum Alloy
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发布时间：2023-12-18 - 摘要：<正>美国EC Power公司和宾州州立大学发明了一种新颖的高性能锂离子电池:全气候电池（All Climate Battery）。与常规锂离子电池相比,该电池零下30℃的动力性能提高10倍以上,而常温和高温性能不受影响。相关研究成果已发布在最近出版的《自然》上。
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发布时间：2023-12-18 - 摘要：<正>攀钢自主开发生产的高档超细二氧化钛新产品,目前已成功替代进口同类产品。超细二氧化钛是普通颜料钛白粒径的1/10。这种小粒径可赋予产品很多特殊的性能,如紫外线屏蔽性能优异、颜色效应丰富、应力分散均匀、在漆膜中呈现"透明"等。这
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发布时间：2023-12-18 - 摘要：<正>电动汽车、太阳能光伏以及可再生能源,这些政府正在大力推行的节能减排政策和新能源应用,将会成为未来我国铜应用的重要领域。国际铜业协会的统计数据显示,电力电缆是目前铜应用产品占比最高的,达到了15.6%,其次是绕组线,占
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发布时间：2023-12-18 - 摘要：<正>来自重庆瑞明超尼汽车部件有限公司的消息,该公司拟实施年产40万件缸盖机加工项目,目前正处于环评公示阶段。据悉,瑞明超尼缸盖机加工项目,位于重庆市两江新区龙兴工业园,总投资9 670万元,占地面积1.95万平方米,
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发布时间：2023-12-18 - 摘要：<正>近日,吉林经开区同中国科学院长春应用化学研究所科技发展处就"一种新型锂电池正极材料"中试项目落户经开区达成初步意向。据了解,长春应用应化所开发的这种新型锂电池正极材料,具有提高锂电池容量、加大放电倍率和支持快速充电
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发布时间：2023-12-18 - 摘要：<正>来自中国汽车工业协会的消息:去年,我国汽车产销总体平稳增长。据统计,2015年,我国汽车产销分别完成2450.33万辆和2459.76万辆,创历史新高,比上年分别增长3.3%和4.7%。
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发布时间：2023-12-18 - 摘要：<正>德国阿伦大学研究人员采用气体喷射技术在热室压铸工艺里生产中空结构镁压铸件。车体结构采用轻质材料可以满足汽车节能减排要求,减少CO2排放和提高燃料效率。镁是理想的轻金属材料,高压压铸提供了采用镁和铝加工生产轻质结构件的可能
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发布时间：2023-12-18 - 摘要：<正>美国轻质材料制造创新机构的第三个技术项目将聚焦钛合金——如果新技术能够降低设计和试验新零件的成本,则将会在航空发动机和其他航空航天设计中得到更广泛应用。项目由GE航空和俄亥俄州立大学牵头,将首先
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发布时间：2023-12-18 - 摘要：<正>工业和信息化部电子信息司近日在重庆市组织召开石墨烯应用技术研讨会,以推动石墨烯技术创新,研讨石墨烯在智能手机、新型显示、锂离子电池、太阳能光伏等下游领域产业化应用路径,推动石墨烯应用技术发展。重庆市经信委重点介绍了重庆市在推进石墨烯技术研发及应用方面开展的工作,其他参会单位分别就当前石墨
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发布时间：2023-12-18 - 摘要：<正>据中国黄金协会最新统计数据显示,2015年,全国累计生产黄金450.053t,与2014年同期相比,黄金产量减少1.746t,同比下降0.39%。其中,黄金矿产金完成379.423t,有色副产金完成70.630t。中国黄金、紫金矿业、山东黄金、山东招金等大型黄金企业集团黄金成品金产量和矿产金产量分别占全国的49.06%和
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发布时间：2023-12-18 - 摘要：<正>31所与西北工业大学联合承担的国家某3D打印制造技术推广应用项目--《激光选区熔化成形技术》（即一种3D打印技术在某涡轮泵上的应用研究）,顺利通过现场测试验收。该项目以新型航天发动机涡轮泵研制为背景,针对核心零件油冷涡轮叶片轴转子开展3D打印技术工程应用研
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发布时间：2023-12-18 - 摘要：<正>英国南安普敦大学（University of Southampton）和REAPsystems合作研究发现了一种新型锂电池,作为光伏系统的储能装置,储能效率可提高至95%,可大幅度降低太阳能发电成本。目前的大部分光伏系统还采用铅酸电池作为储能装置,但相比而言,磷酸锂铁电池能充分发挥其优势,包括提
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发布时间：2023-12-18 - 摘要：<正>液态金属是我国在全球范围内技术领先的原创科技之一。近期,该领域曝出了不少技术突破。美国麻省理工大学官网宣布,该校研究团队近日发明了一种液态金属锂电池,利用混合液态金属制作电极,能大幅提升电池使用寿命。另外,液态金属纳米抗癌机器人项目也有了新的突破。
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发布时间：2023-12-18
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