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AZ91D镁合金低压交流氧化成膜机制
AZ91D镁合金 交流低压 阳极氧化 成膜过程
2011/11/4
基于一种低的交流电压条件(10 V),在NaOH和Na2SiO3的混合溶液体系中,对AZ91D镁合金进行电化学阳极氧化处理.利用扫描电镜(SEM)、X射线能谱仪(EDS)、X射线衍射仪(XRD)、电化学测试技术等手段研究了AZ91D镁合金表面阳极氧化的成膜过程、膜层生长的特点以及氧化工艺参数对膜层性能的影响规律.试验结果表明:在10 V这样低的交流电压下,在镁合金表面获得的氧化膜层表面均匀,为无孔...
Control of measurement equipment in the aspect of integrated quality management
measurement equipment integrated quality management
2010/8/12
There are many factors influencing the quality of productive process and assurance of the conditions that are safe for workers’ health and life and natural environment. One of those factors is properl...
The efficiency of different machines for controlling of western corn rootworm adults
efficiency different machines controlling western corn rootworm adults
2010/8/12
The western corn rootworm, Diabrotica virgifera virgifera LeConte (Fig. 1), is one of the most devastating corn rootworm species in North America. Corn rootworm larvae can destroy significant percenta...
以四氯化钛为反应前驱体, 用低温水热法制备纯金红石相纳米TiO2, 研究了反应温度和反应时间对TiO2微结构和形貌的影响。X--射线衍射分析表明, 所有产物均为纯金红石型纳米TiO2, 晶粒尺寸范围4.0----11.5 nm。 红外光谱和热重分析表明, 产物TiO2存在表面羟基和表面水。TEM分析表明, 反应温度为60--80℃的TiO2样品呈梭形, 且彼此聚集呈束状, 但反应温度高于120℃时...
反应合成Ti--35\%Al多孔合金的膨胀特性
金属材料 Ti--Al金属间化合物 多孔材料 反应合成 膨胀行为
2010/8/19
烧结膨胀特性是元素粉末反应合成Ti--Al合金多孔材料的重要特征, 与其孔结构性能密切相关。本文在其它制备参数一定的条件下, 从普通反应合成和约束烧结二个过程分别论述Ti--Al合金多孔材料的膨胀行为及其规律。结果表明: Ti/Al元素的溶解度和扩散速率的差异导致Kirkendall孔隙的产生, 引起了坯体体积的大幅度膨胀。在Al的第一阶段偏扩散过程中, Ti--Al烧结坯发生了高达60\%以上的...
结合Sn--3.5Ag和Sn--3.0Ag--0.5Cu两种无铅钎料研究了镀镍浸金层(Electroless Nickel Immersion Gold, ENIG)表面层对焊点界面反应以及力学性能的影响。结果表明, 钎焊后在Sn--3.5Ag/ENIG/Cu界面主要生成(NiyCu1-y)3Sn4,在Sn--3.0Ag--0.5Cu/ENIG/Cu界面主要生成(CuxNi1-x)6Sn5。在Sn...
A review on an employee empowerment in TQM practice
A review an employee empowerment TQM practice
2010/8/12
TQM is a journey and it never ends. A change is the only permanent. TQM is a philosophy and strategy minded customer. The word total implies that all members of the organization make
consistent effor...
Integration of part classification, cell formation and capacity adjustment
Integration part classification cell formation capacity adjustment
2010/8/12
In today’s competitive market improving productivity is of great concern for any manufacturing firm. Production engineers continuously adapt state-of-the-art techniques and methodologies in order to a...
Development of cartilage conduction hearing aid
Industrial management and organization Safety and health management Hearing aid Sound conduction via tragal cartilage
2010/8/17
It is well known that physical function deteriorates with increasing age [1], and hearing ability is no exception [2, 3]. A hearing aid is usually supplied to elderly people with a hearing impairment....
Corrosion of evaporator tubes in low emission steam boilers
Corrosion Low-emission steam boiler Evaporator tubes Sulfide corrosion
2010/8/17
Corrosion of water walls is the serious problem in low-emission coal fired boilers operation. Modification of combustion process was developed for limitation nitride oxides (NOx) emission. Ashes and s...
Influence of management system on the safety level in chosen enterprise
management system safety level enterprise
2010/8/12
During competitive market, advanced technologies and the intensive exploitation of resources, the number of natural and technical threats grew up considerably. The large economic growth rate causes in...
Postural analysis in HMI design: an extension of OCRA standard to evaluate discomfort level
Postural analysis HMI design an extension OCRA evaluate discomfort level
2010/8/12
Machine ergonomic studies are able to develop design evaluation parameters in order to provide a help to designers, buyers and users in choosing design and/or product solutions. In
industrial environ...
Global gene expression analysis for evaluation and design of biomaterials
Global gene expression analysis evaluation design of biomaterials
2010/10/12
Comprehensive gene expression analysis using DNA microarrays has become a widespread technique in molecular biological research. In the biomaterials field, it is used to evaluate the biocompatibility ...
Cell and biomolecule delivery for regenerative medicine
Cell biomolecule delivery regenerative medicine
2010/10/12
Regenerative medicine is an exciting field that aims to create regenerative alternatives to harvest tissues for transplantation. In this approach, the delivery of cells and biological molecules plays ...