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电沉积非晶态铬镀层及其耐蚀性 总被引:2,自引:2,他引:0
在低浓度铬酸溶液中,室浊罡获得了镜面光亮的铬镀层,X射线衍射,透射电镀选区电子衍射(SAED)表明,镀层为非晶态。非晶态铬镀层在1mol/LHCl、1mol=LH2SO4和3%NaCl溶液中的俯腐蚀结果,与传统铬镀层相比,非晶态铬镀层具遥更为优良的耐蚀性能。 相似文献
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本文研究了从三价铬电镀溶液中获得非晶态铬镀层的工艺,用EDX和WDX测定了镀层的组成,表明镀层是由铬和少量的碳组成:用X—射线衍射测定了镀层的结构;发现镀层在2θ为43°时,有非晶态的特征峰“BrondGausionPeak”;并且用EG&GPARC电化学软件研究了电镀溶液的电化学行为。 相似文献
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电化学方法制备非晶态铬工艺的研究 总被引:7,自引:0,他引:7
本文研究了从三价格电镀溶液中获得非晶态铬镀层的工艺,用EDX和WDX测定了镀层的组成,表明镀层是由铬和少量的碳组成,用X-射线衍射测定了镀层的结构;发现镀层在2θ为43°时,有非晶态的特征峰“Brond Gausion Peak”;并且用EG&G PARC电化学软件研究了电镀溶液的电化学行为。 相似文献
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非晶态铬镀层表面的X光电子能谱研究 总被引:2,自引:1,他引:1
非晶态铬镀层具有优良的物理、化学和机械性能,根据非晶态铬镀层的特点用X-射线光电子能谱(XPS)对于进行表面元素全分析和Ar^+溅射浓度剖析,发现所获非晶态铬镀层由Cr、O和C等元素组成。O和C元素不仅存在于镀层表面,而且存在于整个镀层中。其中O是以-COOH和吸附H2O及Cr的氧化物形式存在;C以-COOH和石墨存在;在Cr则以Cr、Cr2O3、CrO2及CrOOH形式存在。 相似文献
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采用闭合场非平衡磁控溅射技术,固定碳靶电流参数,调节铬靶电流参数,在GCr15轴承钢球、45#钢和单晶硅基体上制备出自润滑Cr/C复合镀层。用XRD对镀层相结构进行分析,测试了镀层的摩擦系数、磨损率、结合强度、硬度和韧性,用光学显微镜观察镀层磨损形貌。结果表明,镀层相结构为非晶态,随铬靶电流变大逐渐向晶态转变;与未镀层的基体相比,镀层有良好的摩擦磨损性能和载荷承载能力;镀层随铬靶电流增加,硬度逐渐降低,韧性逐渐提高。所获铬电流为0.1和0.3A镀层有很好的自润滑性能,且后者有良好的综合机械性能。 相似文献
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M. S. Hundal 《Design Studies》1991,12(4):227-231
The paper looks at the current research in computer-aided design at US universities. Design research in the US has increased dramatically in the last four years. The major sponsoring agencies for this research are named, as are the conferences and journals where the results of this research are presented. Emphasis is placed on research dealing with the design process itself. The areas of new design theories and methodologies, feature-based modelling, and knowledge-based CAD systems are included. Concurrent engineering is becoming a prominent research area. 相似文献
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再碱化技术应用于实践必须解决的一个重要问题是再碱化过程的控制.在综合分析国内外相关研究的基础上,首先,对不同研究者所做的研究进行了剖析,分析了其研究的路线方法;然后,从控制理论研究的不同方面分析展示了其研究进展;最后,深入分析了各研究,揭示了其中不足之处,指出了再碱化控制理论的发展现状,为进一步研究提供参考. 相似文献
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现代光学新分支学科——气动光学 总被引:4,自引:0,他引:4
从气动光学学科发展历程出发,介绍了气动光学提出的背景,提出了气动光学的定义及内涵、研究对象和研究方法,描述了气动光学研究的主要内容:气动光学效应机理研究、气动光学效应校正方法研究、气动光学效应校正验证试验研究和高速飞行器光学窗口技术研究;详细阐述了国内开展气动光学学科理论基础、工程建模、试验原理及试验方法等研究途径,给出了一些典型的研究结果,指出了学科的应用前景和发展趋势。 相似文献
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Diana Laurillard 《Design Studies》1982,3(4):193-195
This paper is a brief review of recent trends in educational research, with some comments on applying research methods in the context of design education. The recent trends in educational research are identified as being linked with classroom practice, and include case studies, action research and phenomeno-logical methods. Some examples are given of these types of educational research. The paper concludes with suggestions for classroom-based research that teachers themselves can do. 相似文献
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关于先进结构陶瓷的研究 总被引:44,自引:1,他引:43
本文回顾了我国先进陶瓷材料研究四十余年来的进展.我国一贯重视陶瓷学的基础研究和应用基础研究对陶瓷工艺的指导作用,同时亦更注意新材料的工艺研究.本文简要地介绍了这些方面的主要成就.最后,对先进结构陶瓷材料研究需要考虑的问题提出一些拙见,以供讨论. 相似文献
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网上三种信任模型的分析与比较 总被引:2,自引:0,他引:2
信任是信赖他人的一种意愿,是一个抽象的、跨学科的概念,是阻碍电子商务发展的最大的障碍之一.在现有信任研究成果的基础上,将网上信任的研究内容归纳概括为:网上信任概念及概念模型、网上信任实体模型和网上信任实证研究模型,并分别从这三方面对信任研究进行了阐述.最后,比较分析了这三大模型的研究目的、研究对象和研究方法的差异. 相似文献
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This paper summarises a study designed to answer the following question: what are the benefits to Swedish society of road safety research in Sweden funded by the Swedish Transport Research Council and the programme for vehicle safety research during the period 1971-2004? The paper starts by discussing whether research can answer this question at all and explains why a well-controlled study was not feasible. A case study approach was selected, and five major research projects were examined in detail for the purpose of trying to estimate their effects on road safety. Estimates of safety effects were developed for four of the projects, indicating that road safety measures that were at least to some extent based on the findings of the research projects have made major contributions to reducing the number of road accident fatalities in Sweden. The estimates are not analytically rigorous and should be treated as qualified guesses only. Causal inferences are not possible. Nevertheless, if taken at face value, they show that the benefits to society of road safety research are large and outweigh by a wide margin the costs of the research, and of the road safety measures developed as a result of research. Thus, even if the estimated safety benefits exaggerate the true effects, the benefits of applied road safety research are likely to be greater than the costs of conducting this research and implementing road safety measures developed by research. 相似文献