高功率Ni/MH电池用AB5型负极储氢合金的研究   总被引：2，自引：0，他引：2  

叶辉  张宏 《中国科学院研究生院学报》2003,20(3):381-387

研究和开发具有优异高倍率特性的储氢电极合金是发展高功率型Ni/MH电池的技术关键,具有重大的理论意义和商业价值。基于合金热力学和动力学行为的讨论,研究了AB5型储氢电极合金的微结构对其倍率放电性能的影响。结果表明,由于非化学计量(B/A >5 )和高催化活性第二相的引入,B侧添加硼或钼可以显著提高合金的高倍率放电容量和低温放电容量。进一步结合A侧稀土成分优化,发展出一类具有优异倍率性能的MmNi3.55Co0.75Mn0.4Al0.3Bx(Mm为混合稀土)合金。该系列合金有望应用于高功率Ni/MH电池和低温( - 35 oC)Ni/MH电池。  相似文献   

锰矿冶炼中Fe、Mn对周边土壤的影响   总被引：2，自引：0，他引：2  

金茜  钟永科  伍远辉 《遵义师范学院学报》2006,8(3):49-50

通过对某锰矿冶炼厂周边地区土壤中铁锰元素的分析,发现冶炼厂周围土壤受锰矿冶炼厂的污染。含大量铁锰元素的粉尘、矿渣等进入土壤,使土壤中铁锰元素显著增加。实验结果显示:该冶炼厂附近土壤受Fe、Mn元素污染较重,土壤中铁锰含量分别为20250.78￣28426.06mg·kg-1、674.41￣4467.66mg·kg-1,已超出正常范围。冶炼厂粉尘中铁锰含量分别为78425.51￣78800.34mg·kg-1、100052.02￣100286.13mg·kg-1,矿渣中铁锰含量分别为2955.35￣3076.58mg·kg-1、7901.24￣8012.12mg·kg-1。土壤中铁锰含量与粉尘、矿渣中铁锰含量具有一定的相关性。该冶炼厂周围土壤已受到一定程度的污染。  相似文献   

6061-T5铝合金搅拌摩擦焊接头组织和力学性能     

吕煜  郭国林  徐子骞  王杰  王乐  吴柯寒  高安慧 《常熟理工学院学报》2020,(2):66-69

采用搅拌摩擦焊技术对6061-T5铝合金进行焊接,分析了焊接速度对接头成形、微观结构及力学性能的影响.结果表明:随着焊接速度的增加,沉淀相固溶度下降,晶粒细化;焊接速度过大时,热输入不足,呈现原始态组织.当转速为800 r/min,焊接速度为60 mm/min时,接头成形良好,抗拉强度达到最大值.采用合适的搅拌摩擦焊工艺参数,6061-T5铝合金能实现可靠的连接.  相似文献   

Ti—Zr—Ni基准晶合金的热力学和电化学贮氢性能     

赵东江  马松艳  由喜强  王立民  白晓波 《绥化学院学报》2008,28(1):169-171

对急冷凝固方法、熔融纺丝法、机械合金化法等制备Ti-Zr-Ni基准晶合金的方法进行探讨,综述了几种Ti-Zr-Ni基准晶合金的热力学和电化学贮氢性能。  相似文献   

功率超声细化Sn-Sb包晶合金     

QI Fei-peng  ZHANG Hai-bo  GAO Shou-lei  ZHAI Qi-jie 《上海大学学报(英文版)》2005,9(1)

In this paper the solidification behavior of Sn-Sb peritectic alloy and the mechanism of grain refinement in solidification process under high-intensity ultrasonic field are investigated. Three different powers of high-intensity ultrasound are introduced into molten Sn-Sb peritectic alloy to study the refining effectiveness. The results show that the application of high-intensity ultrasound during solidification process of Sn-Sb peritectic alloy can refine α phase and β phase and eliminate gravity segregation of the alloy. As acoustic intensity is increased from 400 W to 800 W, not only the homogenous fine structure can be obtained, but also the cubic β phase crystals tend to be spherical. Microstructure of the sample treated by 600 W high-intensity ultrasound demonstrates the best refining effect.  相似文献   

Al-Mn二十面体准晶的相变研究     

成惠  张春元  赵宝群 《内江师范学院学报》2007,22(4):50-53

分析了Al原子和Mn原子在二十面体准晶中的排列,计算并推导出了在急冷制备过程中,温度变化范围大约在1290.9℃,而熔炉的温度必须达到1810.9℃才能保证二十面体结构的生成,而且要控制温度变化速率,以减少Al晶体生成.而这种二十面体结构是亚稳定的,它在任何温度下存放一定时间都会发生相变.  相似文献   

Catalytic Effect of SCN^— on Electrodeposition of Zinc—Nickle Alloy     

Zheng-hua Fang  Ren-he Yin  A. Zakaria  Li Zhang 《上海大学学报(英文版)》2001,5(2):160-163

The electrodeposition of zinc-nickle alloy was obtained on a copper cathode of 1×1cm². The deposited alloys are quantitatively analyzed by atomic absorption spectrometry. The morphology of the deposits was observed by means of scanning electron microscopy (SEM). We observed that the electrodeposition of zinc-nickle alloy is an anomalous codeposition. The catalytic effects of SCN” on the electrochemical behavior of Ni deposition and hydrogen discharge are obvious. SEM analysis shows that the surface morphology of the coating appears to be more compact and homogeneous with the increase of SCN” concentration. Supported by the State Key Lab. for Phys. Chem. of Solid Surface, Xiamen University  相似文献   

稳定维生素C源的提纯工艺研究     

张玮  尚平 《石家庄职业技术学院学报》2005,17(6):24-25

L-抗坏血酸-2-磷酸酯镁是-种稳定的维生素C衍生物，是维生素C转化的较好途径．通过改进合成反应的催化剂减少副产物使提纯工作简化．最佳提纯工艺条件为溶液pH值6．2，搅拌脱色最佳时间1．5h，最佳搅拌温度40℃．  相似文献   

Dielectric Properties of ZnTiO3 Microwave Ceramics Consolidated with MgTiO3   总被引：2，自引：0，他引：2  

吴霞宛  王玉梅  肖谧 《天津大学学报(英文版)》2006,12(1):28-32

STABILIZED ZNTIO, WAS PREPARED BY DOPING MAGNESIUM OXIDE THROUGH TRADITIONAL SOLID-STATE REACTION. THE EXPERIMENTAL RESULTS INDICATE THAT ZINC TITANATE CRYSTALS DOPED WITH MAGNESIUM OXIDE GROW WELL AND THE DECOMPOSITION INTO ZN2TIO4 AND TIO2 IS RESTRAINED THROUGH TRADITIONAL SOLID STATE REACTION. BY ADJUSTING MOLAR RATIO OF MGO, BETTER PROPERTIES CAN BE OBTAINED. THE DIELECTRIC PROPERTIES OF THE CERAMICS DOPED WITH 30% MGO( MOLAR PERCENTAGE) SINTERED AT 1 060 ℃ ARE AS FOLLOWS:THE VALUE OF QUALITY FACTOR IS GREATER THAN 20 000(6. 5 GHZ), THE TEMPERATURE COEFFICIENT OF RESONANCE FREQUENCY IS ABOUT 2 × 10-6/℃, THE DIELECTRIC CONSTANT RANGES FROM 18 TO 22. BESIDES, IT IS PROVED THAT HEAT TREATMENT CAN OPTIMIZE MICROSTRUCTURE AND THE VALUE OF QUALITY FACTOR, WHICH INCREASES FROM 23 833.93 TO 47 584.00 AFTER 2 H OF HEAT TREATMENT AT 1 040 ℃.  相似文献   

合金钢、铁合金中微量硼的测定     

王铎  赵志宏  王芳英 《陕西理工学院学报(社会科学版)》2001,19(6):62-66

利用姜黄素在强酸非水介质中与硼酸生成有色络合物测定微量硼 ,并进行比色测定 ,方法检出限为 7 7× 10 - 8g mL ,相对标准偏差为 0 5 9% (3 3× 10 - 7g mL ,姜黄素 ,n =10 ) ,线性范围 :2 0× 10 - 7～ 1 2× 10 - 6g mL .  相似文献