共查询到19条相似文献,搜索用时 734 毫秒
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介绍了新型深井阳极地床在辽阳化纤公司、吉林前郭炼油厂、大庆石化总厂等大型石化厂区地下管网区域性阴极保护工程中应用的实例与经验,提出了解决深井阳极“气阻”问题、提高施工质量、延长阳极井床寿命的技术途径。 相似文献
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阐述了功能陶瓷、玻璃等无机非金属材料与金属及半导体材料进行阳极键合的键合机理、在MEMS中的应用及其发展前景;列举了阳极键合在MEMS生产过程中的一些最新应用实例;指出了其在MEMS的生产制造过程中存在的一些问题及今后的研究方向。 相似文献
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为了提高键合质量、优化键合材料,促进阳极键合技术在工业生产中的应用,本文以“硅/玻璃”的阳极键合为例,阐述了阳极键合作为新型连接工艺的键合机理及工艺过程,介绍了现阶段阳极键合在国内外工业生产中的应用实例及相关研究,尤其是在微电子封装领域所展现的杰出应用前景,同时结合阳极键合过程中对键合参数、材料处理等要求,给出了影响键合质量的各种因素,以及在键合过程中常出现的问题及其解决办法.本文立足于键合机理及键合工艺过程,结合不同材料特性,重点阐述了阳极键合这一新型连接工艺的国内外研究现状及影响键合的因素,为进一步提高键合质量、优化键合工艺、开发新的键合材料等提供理论依据. 相似文献
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介绍了钛基贱金属氧化物涂层阳极的发展概状。论述了贱金属氧化物涂层阳极技术发展的必然和要解决的关键问题。重点阐述了几种有代表性、具有广阔应用前景的贱金属氧化物涂层阳极,并对其未来的发展及应用前景进行了展望. 相似文献
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锂离子二次电池负极材料的研究综述 总被引:1,自引:0,他引:1
总结了在碳材料、合金材料和复合材料等3个锂离子电池负极材料研发的主导方向上的开发情况和它们各自特点,描述了目前的研究所面临难题,给出了锂离子电池负极材料研发取得重大突破的可能途径和建议. 相似文献
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分别论述了铝合金牺牲阳极、锌合金牺牲阳极、铁合金牺牲阳极的研究和发展过程,总结了各种阳极的研发现状、研发热点和相应的阳极产品研发成果,指出了针对特殊环境和细分领域的各种阳极,是阳极新材料未来发展的主要方向。对于铝合金牺牲阳极,介绍了常规铝合金牺牲阳极和包括海水环境低驱动电位阳极、油污海水低驱动电位牺牲阳极、适用于干湿交替环境的阳极和适用于高温环境中的阳极等在内的针对特殊环境和特殊材料的铝合金牺牲阳极在舰船阴极保护领域的应用,总结了船舶用铝合金牺牲阳极的研究进展;对于锌合金牺牲阳极,主要介绍了锌合金牺牲阳极的发展历史、研究现状和相应的阳极产品;对于铁合金牺牲阳极,主要总结了铁合金牺牲阳极的研究现状和在舰船上的实际应用。 相似文献
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Yuanyuan Zhao Yusheng Ye Feng Wu Yuejiao Li Li Li Renjie Chen 《Advanced materials (Deerfield Beach, Fla.)》2019,31(12)
Lithium–sulfur (Li–S) batteries are considered as one of the most promising options to realize rechargeable batteries with high energy capacity. Previously, research has mainly focused on solving the polysulfides' shuttle, cathode volume changes, and sulfur conductivity problems. However, the instability of anodes in Li–S batteries has become a bottleneck to achieving high performance. Herein, the main efforts to develop highly stable anodes for Li–S batteries, mainly including lithium metal anodes, carbon‐based anodes, and alloy‐based anodes, are considered. Based on these anodes, their interfacial engineering and structure design are identified as the two most important directions to achieve ideal anodes. Because of high reactivity and large volume change during cycling, Li anodes suffer from severe side reactions and structure collapse. The solid electrolyte interphase formed in situ by modified electrolytes and ex situ artificial coating layers can enhance the interfacial stability of anodes. Replacing common Li foil with rationally designed anodes not only suppresses the formation of dendritic Li but also delays the failure of Li anodes. Manipulating the anode interface engineering and rationally designing anode architecture represents an attractive path to develop high‐performance Li–S batteries. 相似文献
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辅助阳极是电子防腐蚀系统的关键部件之一,为提高其性能及寿命,利用热分解法制备了Ru-Ir-Sn-Ti混合氧化物涂层钛基阳极,用SEM,XRD,动电位极化曲线、强化电解寿命试验和热水器内胆电子防腐蚀试验考察了不同Sn含量的混合氧化物涂层钛电极的性能。结果表明:Ru-Ir-Sn-Ti混合氧化物涂层覆盖良好,呈均匀龟裂状;添加适量的Sn能提高涂层的电化学活性,含10%(摩尔分数)Sn涂层的电化学性能最优;含30%(摩尔分数)Sn涂层的强化电解寿命达58 h;混合氧化物涂层钛阳极在输入很小的电压时,能有效防止水下搪瓷碳钢在高硬度热水中的腐蚀,且能使阴极材料表面沉淀一层钙质层,增强了保护效果。 相似文献
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在锌基阳极中加入稀土(RE)、In等可进一步改善阳极材料的电化学性能。为此,在纯Zn中添加稀土Ce、In制备了锌合金阳极,通过极化曲线、电化学测量和表面形貌观察,研究了所得合金阳极在不同温度下的电化学性能,获得了Ce、In对锌合金阳极电化学性能的影响规律。结果表明:Ce可以细化晶粒,使腐蚀产物易脱落,纯锌中添加In可以使开路电位变负;在20,50,70℃不同温度下Zn-Ce-In合金的电位始终比钢铁的开路电路(-0.8 V)负0.2 V左右,能够对钢铁产生保护作用。 相似文献
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The paper deals with the solution of two problems for which a two-dimensional distribution is found of the current density and of the electric field in the hollow-cathode plasma. In the first one of these problems, the anode surface of the cavity represents two concentric flat anodes separated by an insulator. This system is used to study the problem of switching the current over from the external to internal anode, with the anode drop being a nonlinear function of current density. The distribution of the current density and of the anode voltage drop on the surfaces of both anodes is calculated for different potentials of the external and internal anodes. In the second problem, the function of internal anode is served by the open boundary of plasma with zero anode drop. The shape of the plasma boundary is determined depending on the plasma cathode geometry and parameters. The singularities are discussed that characterize the extraction of current from the open plasma boundary for different forms of electric discharges. 相似文献
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L. Steven Hou W. Sun 《International journal for numerical methods in engineering》1994,37(16):2779-2796
Some optimal control problems arising from impressed cathodic protection systems are considered. Our objective is to find the location of anodes and the current density on the anodes that yield an optimal potential distribution on the cathode. We present a simple formula for the linear model and a gradient algorithm for the non-linear model. Boundary element methods are employed for the numerical calculation. 相似文献