基于CAM的STM和AFM的一种新型偏心升降装置研究

根据STM和AFM的扫描原理，通过CAM设计了一种新型偏心升降装置，使STM和AFM测试样品的高度大为增加，形成柔性测试系统。根据对实际工况的仿真研究，对装置进行了修改。     

聚苯乙烯纳米微球单层膜的制备、表征及其力学性能的研究

通过对硅片基底亲水处理和改善纳米微球胶体溶液与硅片基底之间的浸润性,利用毛细管制得单层紧密排列的聚苯乙烯纳米微球,探讨了成膜机理与关键因素,和与其它方法相比,制样成功率高,操作简单,成膜速度快。利用AFM对纳米微球的力学性质进行了研究,着重分析了AFM力曲线的测量过程与分析方法,建立了AFM针尖与纳米微球之间的接触模型并测得室温下200nm聚苯乙烯纳米微球的弹性模量为3.400±0.492GPa。     

原子力显微镜阳极氧化加工的机理研究

介绍了使用原子力显微镜在电场作用下诱导表面局部阳极氧化反应的机理,分析了偏置电压、氧化物厚度对氧化物生长速度的影响,以及湿度和电压对氧化物的尺寸的影响,指出了现阶段AFM纳米加工技术的不足,并对未来的AFM纳米加工技术进行了展望.     

十二胺在碳钢表面的吸附行为

利用原子力显微镜（AFM）、动电位扫描及润湿角测量等手段研究了盐酸溶液中十二胺在碳钢表面的吸附行为及其对碳钢腐蚀行为的影响。结果表明：十二胺在碳钢表面形成了单分子吸附层。其对碳钢的缓蚀机理主要为“几何覆盖效应”，一个十二胺分子平均可以取代2．32个水分子；碳钢表面的润湿性随缓蚀剂浓度的增大而减弱。AFM电流图像显示，碳钢表面有十二胺吸附的部位导电性能明显减弱；AFM力—距离曲线表明，碳钢表面有缓蚀剂吸附的部位呈现出明显的黏附力。     

基于原子力显微镜的薄膜原位压痕力学性能研究

基于原子力显微镜(AFM)和扫描电子显微镜(SEM)建立了一套原位纳米压痕测试系统。该系统可以实现控制带有金刚石(Cube corner)压头的AFM微悬臂梁对样品进行压入实验,并得到载荷-位移曲线,同时可以对压痕过程进行原位SEM实时观察。发展了一种基于AFM微悬臂梁加载和原位SEM压痕图像分析的力学性能测试方法,通过测量压入最大载荷和原位SEM测量压痕残余面积得到塑性薄膜的硬度和弹性模量。利用此方法对磁控溅射硅衬底上纳米晶银薄膜进行了压痕实验,并与Nanoindenter G200型纳米压痕仪实验进行对比研究。结果表明,原位AFM压痕方法具有高的载荷和位移分辨率,可以实现纳牛至微牛级的压痕实验,通过测量压痕面积得到塑性薄膜的硬度值,减小了使用Oliver-pharr方法中软膜硬基底上凸起(Pile-up)效应的影响,计算结果也具有好的测试精度和可靠性。     

反应烧结碳化硅高温氧化过程的表面分析

用扫描电子显微镜(SEM)、原子力显微镜(AFM)等表面分析方法,考察了反应烧结碳化硅(RBSC)材料在纯氧气中的氧化行为.结果表明,反应烧结SiC(RBSC)表面残余Si比α-SiC拥有更多的缺陷,初期氧化速率更快.表面粗糙度的变化在一定程度上也反映了氧化发生的过程.结合氧化动力学、SEM及AFM,建立了RBSC初期氧化过程的生长模型.提供表面三维信息的AFM和分析成分与形貌信息的SEM技术是研究表面氧化过程尤其是初期氧化十分方便有效的工具.     

Measurement of electrical conductivity of micron-scale metallic wires

Electrical conductivltles of micron-scale aluminum wires were quantitatively measured by a four-point atomic force microscope （AFM） probe. This technique is a combination of the principles of the four-point probe method and standard AFM. This technique was applied to the 99.999% aluminum wires with 350 nm thickness and different widths of 5.0, 25.0 and 50.0 μm. Since the small dimensions of the wires, the geometrical effects were discussed in details. Experiment results show that the four-point AFM probe is mechanically flexible and robust. The four-point AFM probe technique is capable of measuring surface topography together with local electrical conductivity simultaneously. The repeatable measurements indicate that this technique could be used for fast in-situ electrical properties characterization of sensors and microelectromechanical system devices.     

原子力显微镜对钢筋表面钝化膜的研究

利刚原子力显微镜(AFM)对钢筋在模拟混凝土孔溶液中形成的钝化膜开展研究。结果表明,AFM是研究钝化膜微观结构和表面形貌的有力工具;钢筋钝化胶是有缺陷的;复合缓蚀剂可以改善钢筋钝化膜的微观结构和表面形貌从而提高抗点蚀的能。     

十二胺对氯化钠溶液中铜镍合金的缓蚀行为及吸附机理的研究

用电化学方法和原子力显微镜(AFM)研究了NaCl溶液中十二胺在铜镍合金表面的缓蚀及吸附行为.结果表明,十二胺对阴极和阳极反应均有抑制作用,但主要抑制了阴极反应.吸附模型的拟合结果证明十二胺在铜镍合金表面的吸附符合Flory-Huggins等温线模型.十二胺吸附膜改变了电极表面双电层结构,使零电荷电位正移.AFM相位图显示,随着缓蚀剂浓度增加,缓蚀剂吸附层变得更加致密和有序,导致缓蚀效率增加.AFM力曲线测试结果指出,含有十二胺的溶液中力曲线显示粘附力特性,而且探针与样品表面之间的长程静电斥力与空白溶液相比有减小趋势.     

红四氮唑对冷轧钢在磷酸溶液中的缓蚀性能

用失重法、动电位极化曲线和原子力显微镜（AFM）研究了红四氮唑对冷轧钢在1.0 mol/L~10.0 mol/L H₃PO₄溶液中的缓蚀作用。结果表明：红四氮唑对冷轧钢具有中等程度的缓蚀作用,为混合抑制型缓蚀剂,且在钢表面的吸附符合Freundlich吸附模型;通过吸附热力学和腐蚀动力学公式分别求出了相应的吸附热力学参数和动力学参数,并根据这些参数详细讨论了缓蚀作用机理;AFM测试结果表明添加红四氮唑后钢表面较为平整,粗糙度降低。     

Modelling the abrasive flow machining process on advanced ceramic materials

Abrasive flow machining (AFM) is a unique machining method used to achieve high surface quality on inner, difficult-to-access and on outside contours. Using AFM, it is possible to realise predefined edge rounding on any brittle or hard material. AFM is easy to integrate in an automated manufacturing environment. The abrasive medium applied during AFM is a fluid consisting of a polymer which carries silicon carbide or super-abrasive grains. With a specified pressure and temperature, this fluid flows in alternating directions along the contours of the workpiece resulting in an abrasive effect. AFM is also well suited to process advanced ceramic materials. Especially advanced ceramics are playing increasingly a significant role as a substitute for metals. However the high costs for the inevitable finishing process on ceramics prevent a more frequent use. This paper represents the technological results of a research-project discovering the fundamental principles of AFM on advanced ceramic materials such as a correlation between flow processes, surface formation and edge rounding. Furthermore an insight into a process model is given, which was developed using modern simulation techniques. The overall objective of this approach is to anticipate work results like surface quality and edge rounding on any user-defined geometry.     

Atomic force microscopy study of biaxially oriented polypropylene films

Atomic force microscopy (AFM) uses a very sharp pointed mechanical probe to collect real-space morphological information of solid surfaces. AFM was used in this study to image the surface morphology of a biaxially oriented polypropylene film. The polymer film is characterized by a nanometer-scale, fiberlike network structure, which reflects the drawing process used during the fabrication of the film. AFM was used to study polymer-surface treatment to improve wettability by exposing the polymer to ozone with or without ultraviolet (UV) irradiation. Surface-morphology changes observed by AFM are the result of the surface oxidation induced by the treatment. Due to the topographic features of the polymer film, the fiberlike structure has been used to check the performance of the AFM tip. An AFM image is a mixture of the surface morphology and the shape of the AFM tip. Therefore, it is important to check the performance of a tip to ensure that the AFM image collected reflects the true surface features of the sample, rather than contamination on the AFM tip.     

Corrosion behavior of pure aluminum in FeCl_3 solution

1Introduction Some in-situ imaging technologies such as video camera[1,2]and CLSM(confocal laser scanning microscopy)[3]have been used in corrosion studies,but the detailed morphological characteristics of surfaces can not be obtained from these methods b…     

Corrosion behavior of pure aluminum in FeCl3 solution

The corrosion behavior of pure aluminum in FeCl₃ solution was investigated mainly by in-situ AFM (Atomic Force Microscopy). The results of combined researches of AFM, SEM(Scanning Electron Microscopy) and EDAX(Energy Dispersive Analysis of X-ray) show that in addition to uniform attack, pitting corrosion takes place also on pure aluminum surface in FeCl₃ solution at open-circuit potential, and impurity elements Fe and Cu are found enriched in corrosion product. In-situ AFM was also used to examine the initiation and development of pitting corrosion of pure aluminum induced by potentiodynamic sweep, and the repassivation of an active pit is observed. AFM tip scratching technique was used to produce a physical defect on metal surface, which is traced by in-situ AFM and it is found that the defect is likely to be preferentially attacked and evolve to pitting corrosion.     

原子力显微镜在马氏体相变浮突研究中的应用

用原子力显微镜在大气环境中对Ｆｅ－Ｎｉ－Ｃ合金中的马氏体浮突进行了观察和定量测量。结果表明，原子力显微镜既可清楚地观察浮突形貌，又可定量测量其高度和形状变化，从而提出了一种研究相变浮突的新方法。     

磨料流加工研究进展

磨料流加工是表面加工中发展起来的一项新工艺，是通过将半固态的流体磨料挤压通过工件待加工表面来达到去毛刺，抛光、倒角和去除再铸层的目的。本文介绍了磨料流加工的基本原理，影响磨料流加工的因素，当前磨料流加工的应用现状及加工设备，磨料流加工的研究成果和最新进展，磨料流加工与其它工艺的结合情况。并总结了磨料流加工的主要结论。     

Investigation on AFM-based micro/nano-CNC machining system

To solve the problems in the atomic force microscope (AFM)-based nanomachining process such as nonlinearity and low repeatability positioning accuracy of AFM scanner in a larger scale, a novel micro/nanomachining system similar to conventional CNC machine tools was presented. The system integrated AFM with a precision stage. AFM optical lever detection method was employed to apply a very light normal load on the sample surface. An AFM diamond tip was utilized as a cutting tool to scratch the sample. The precision stage was used as a worktable to move the sample. This process was different from machining with a planer. Based on the system, effects of tip geometry, the scratching direction, the normal load, the machining velocity and the feed on the machining depth were discussed. Fabricating techniques of two-dimensional and three-dimensional complex micro/nano-structures using AFM-based mechanical scratching method based on this system were presented. Complex regular structures were fabricated. Moreover, AFM-tip-induced local anodic oxidation was also carried out based on this system, which displayed higher repeatability positioning accuracy with a larger machining dimensions and a significant machining ability of this system.     

改进的单向磨料流加工效果及轴向力测量研究

由合金材料制成的结构复杂工件内通道及相交部位的毛刺难以有效去除,而采用磨料流(AFM)加工工艺可以有效抛光零件复杂表面、提高工件加工质量。基于此,对不同工作压力的单向磨料流作用下,工件的表面粗糙度和扩展直径进行研究,介绍一种适用于单向AFM轴向力在线测量的装置,分析了不同加工压力和流体通道长度对轴向力和体积流量的影响。研究结果表明:4.0 MPa加工压力下的AFM加工可以有效降低工件表面粗糙度,同时使工件获得更均匀的表面粗糙度,但是4.0 MPa条件下的加工时长远大于7.0 MPa;流体通道长度越短,体积流量相对于轴向力来说随着加工压力的增加而明显增加;而对于最长的流体通道,加工压力的增加导致轴向力的增加更为显著。     

磨料流加工中夹具设计的研究

磨料流加工(AFM)是光整加工领域的一项新技术。磨料流加工由磨料流加工机床,夹具和流体磨料三部分组成。当用磨料流加工形状较复杂的零件时,夹具设计的好坏对表面加工质量和加工效率有重要的影响。本文分析了磨料通过工件孔道的特性。介绍了用于研究材料去除量与加工距离和形状关系的实验。材料去除量在通道两端比中间小是磨料流加工的一基本特性。本文讨论了如何避免因此而产生的工件变形以及如何利用这一特性来获取某种特殊效果。最后,给出了一个用于加工某不锈钢三通体的夹具。