聚焦离子束双束系统在微机电系统失效分析中的应用

MEMS惯性传感器是一种将运动物理量转换成电信号的传感器,其工作原理涉及物理学、机械学、微电子学科等.随着MEMS芯片尺寸的不断缩小和性能的不断提高,传统的半导体失效分析方法已很难满足MEMS器件失效分析的需求.本研究结合MEMS器件的工作原理和FIB双束系统的特点,通过聚焦FIB双束系统分析MEMS芯片中3种常见的失...     

先进的离子束热处理技术和工业应用

评述了离子束技术的发展和应用,特别针对离子束多功能综合加工技术的发展进行了评论.这种技术已经成为独具特色的热处理技术.该技术属于低消耗、高产出、高效率和无污染的绿色加工技术.评述了这一技术的未来发展方向.     

合成孔径聚焦技术在TOFD检测中的应用

为了准确定位和测量在低合金厚板对接焊缝中的缺陷,对超声衍射时差法的D扫描图像进行了处理。为了提高图像的横向分辨率,准确识别缺陷的位置和尺寸,引入了D扫描图像的合成孔径聚焦算法(SAFT-D)。根据缺陷端部和换能器之间的几何关系,建立了D扫描图像SAFT-D处理的数学模型,实现了D扫描图像的SAFT重建。试验结果表明,SAFT-D算法有效地提高了图像的分辨率,增强了缺陷识别的能力,能够准确地定位和定量工件中的缺陷。     

超声合成孔径聚焦技术在点焊质量检测中的应用

介绍了超声合成孔径聚焦技术(SAFT)的原理,利用该技术对航天钛合金电阻点焊试样进行缺陷检测和焊点熔核尺寸测量,并与射线检测及解剖金相结果进行了对比。结果表明,合成孔径聚焦超声检测技术适用于航天钛合金点焊产品的缺陷检测和熔核尺寸测量,可为点焊质量的综合评定提供可靠依据。     

强流脉冲离子束表面再制造技术原理与应用

采用TEMP–6型强流脉冲离子束（HIPIB）装置开展了HIPIB表面再制造技术的研发。HIPIB装置主体由高压脉冲电源系统和高功率离子二极管系统组成，通过高压短脉冲在二极管中放电产生阳极等离子体并引出ns级强流离子束。HIPIB辐照材料表面，发生显著的熔融、蒸发和剧烈烧蚀，物质喷射的反冲作用在辐照表面形成由表及里的应力波，导致材料表层强烈的热-力学效应。利用HIPIB与材料表面的相互作用，应用于涡轮叶片表面的清洗维修，可有效去除涡轮叶片基体因高温氧化形成的氧化物，伴随表层的重熔将叶片基体表面微观缺陷焊合，获得了光滑、平整的涡轮叶片修复表面。实现了HIPIB辐照在涡轮叶片表面再制造方面的应用。     

强流脉冲离子束表面再制造技术原理与应用

采用TEMP-6型强流脉冲离子束(HIPIB)装置开展了HIPIB表面再制造技术的研发.HIPIB装置主体由高压脉冲电源系统和高功率离子二极管系统组成,通过高压短脉冲在二极管中放电产生阳极等离子体并引出ns级强流离子束.HIPIB辐照材料表面,发生显著的熔融、蒸发和剧烈烧蚀,物质喷射的反冲作用在辐照表面形成由表及里的应力波,导致材料表层强烈的热-力学效应.利用HIPIB与材料表面的相互作用,应用于涡轮叶片表面的清洗维修,可有效去除涡轮叶片基体因高温氧化形成的氧化物,伴随表层的重熔将叶片基体表面微观缺陷焊合,获得了光滑、平整的涡轮叶片修复表面.实现了HIPIB辐照在涡轮叶片表面再制造方面的应用.     

高能束流技术及其在腐蚀与防护中的应用

介绍了激光束、电子束、离子束3种高能束流表面强化技术的原理和方法。简 述了其在腐蚀与防护中的应用,并指出了今后的发展方向。     

用离子束技术改善Ni3Al（0.1B）在H2SO4溶液中的耐蚀性能

用多次扫描循环极化法研究经离子束表面改性的Ni_3Al(0.1B)在H_2SO_4溶液中的腐蚀行为。电化学测试和表面形貌的观察结果表明,离子注入、离子束混合和离子束辅助沉积技术对减缓Ni_3Al(0.1B)在用氧气饱和的1N H_2SO_4溶液中的腐蚀和改善钝化性能很有效果。     

光纤传输系统在超快激光加工中的应用研究

随着对超快激光应用安全、高效和灵活需求不断增强,采用Kagome结构空心光子晶体光纤传导来代替传统镜片结构是一种全新选择.开发了基于超快激光光纤传输的可调耦合系统,并对该系统下与自由空间传输光路下的加工质量进行对比.结果表明,超快激光光纤耦合系统传输效率稳定、焦斑能量分布均匀、像散程度小,可有效解决传统镜片组合下的光路...     

高能束流技术及其在腐蚀与防护中的应用

激光束、电子束、离子束三种高能束流技术对材料表 面改性是通过改变材料表面的成分或结构实现的.文章系统地介绍了激光束、电子束、离子 束三种高能束流表面改性技术的原理、方法及其在腐蚀与防护中的应用,并指出了这三种技 术今后需解决的问题.     

THz波成像技术在材料成型中的应用前景分析

针对传统成像方法在材料成型过程中有电弧干扰情况下图像不稳定的问题,结合焊接电弧光谱的分布特征,分析了THz波成像方法的特点,探讨了THz波成像技术在材料成型过程检测中的优势,提出采用THz波成像技术可以避免电弧干扰获得稳定的焊接熔池图像,并初步探讨了该方法的成像系统方案,以及断层成像技术、等离子探测技术用于材料热加工过程监控的特殊用途及其应用前景。     

Metals science and technology

Metallurgical education has been the controversial topic of many discussions, and Journal of Metals has printed four articles on the subject since January 1963 that included views from the United States and the United Kingdom (January and December 1963, January and February 1964). Now, a Canadian educator discusses the subject from his viewpoint.     

微波烧结技术在超硬材料制品中的应用探讨

介绍了微波烧结技术的原理及特点,简要概括了目前制备特种陶瓷的研究现状,并对微波烧结陶瓷材料、硬质合金(WC-Co)、微波烧结金刚石烧结体等问题进行了分析讨论,初步探讨了微波烧结技术在超硬材料制品中广泛应用的可能性。     

Fractal material science: A new direction in materials science

To optimize the structure and properties of alloys, it is necessary to take into account the effect of the self-organization of a dissipative structure with fractal properties at load. This requires the development of self-organizing technologies for material production. Fractal material science takes into account the relation between the parameters of fractal structures and the dissipative properties of alloys. It also takes into account the base properties of highly nonequilibrium systems and the self-organizing process of the fractal structure in bifurcation points. V.S. Ivanova earned her Dr. Tech.Sc. in technical sciences, materials science, at Moscow Power Institute in 1948. She is currently chief expert at A.A. Baikov Institute of Metallurgy. I.J. Bunin earned his Dr. Tech. Sc. in technical science, materials science, at Moscow Engineer-Physical Institute in 1987. He is currently chief research worker at A.A. Baikov Institute of Metallurgy. V.I. Nosenko earned his Dr. Tech. Sc. in technical sciences, mathematical theory of elasticity, at Metallurgical University in 1968. He is currently president of Vita International Corporation. Dr. Nosenko is also a member of TMS.     

半固态技术在材料连接和复合材料制备中的应用

半固态材料技术在材料成形加工领域得到了广泛的应用.综述了国内外将半固态技术作为材料连接与复合材料制备技术的研究及相关的专利,重点分析了半固态连接技术的优点并与传统工艺进行了比较,展望了这种新技术在材料科学与成形加工工程领域中的应用前景与研究方向.     

PLC在生阳极上料系统中的应用

本文简要介绍了生阳极上料PLC控制系统的工艺流程、破件组成和软件功能，它实现了生阳极上料过程的全自动化，并具有操作简便、维护量小、抗干扰能力强等特点，具有良好的推广应用前景。     

New combinatorial chemistry approach in material science

A new combinatorial approach is proposed. It is based on the preparation of crystallized samples with a progressive composition gradient using the melting or floating zone technique. It may be applied to metallic, high refractory, and glass materials and allows the rapid elucidation phase constitution and the variation of physical properties with composition and microstructure. The approach may be applied to a broad spectrum of materials and samples may be quite smaller. Four examples are presented herein: polyphased Al-Co alloys, a single crystal of yttrium oxide codoped by Er³⁺ and Yb³⁺, and a glass sample containing SiO₂-Al₂O₃-CaO-Na₂O-K₂O. This approach constitutes a good and inexpensive experimental method for exploring industrial materials and for the theorical prediction of materials of interest. We propose in this paper a new combinatorial approach to materials study that is based on the preparation of materials with a continuous composition gradient. Samples are prepared by a melting or floating zone technique. On the same sample, it is possible to describe the phases across a phase diagram and to determine physical properties-microstructure-thermal heating-composition relations for those physical properties that can be measured in situ. Four examples will be given: one concerns the direct reading of phases across a phase diagram, the second shows the possibility of relating the phase diagram in-situ measurements of selected physical properties, the third describes the evolution of a physical property and its dependence on composition in a ternary system, and the last corresponds to an easy extension of this approach to higher-order systems.     

New combinatorial chemistry approach in material science

A new combinatorial approach is proposed. It is based on the preparation of crystallized samples with a progressive composition gradient using the melting or floating zone technique. It may be applied to metallic, high refractory, and glass materials and allows the rapid elucidation phase constitution and the variation of physical properties with composition and microstructure. The approach may be applied to a broad spectrum of materials and samples may be quite smaller. Four examples are presented herein: polyphased Al-Co alloys, a single crystal of yttrium oxide codoped by Er³⁺ and Yb³⁺, and a glass sample containing SiO₂-Al₂O₃-CaO-Na₂O-K₂O. This approach constitutes a good and inexpensive experimental method for exploring industrial materials and for the theorical prediction of materials of interest. We propose in this paper a new combinatorial approach to materials study that is based on the preparation of materials with a continuous composition gradient. Samples are prepared by a melting or floating zone technique. On the same sample, it is possible to describe the phases across a phase diagram and to determine physical properties-microstructure-thermal heating-composition relations for those physical properties that can be measured in situ. Four examples will be given: one concerns the direct reading of phases across a phase diagram, the second shows the possibility of relating the phase diagram in-situ measurements of selected physical properties, the third describes the evolution of a physical property and its dependence on composition in a ternary system, and the last corresponds to an easy extension of this approach to higher-order systems.