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1.
A. A. Babakov 《Metal Science and Heat Treatment》1967,9(10):764-770
Conclusions Highly alloyed steels and alloys are produced in conformity with GOST or technical specifications in thick and thin sheets, beams and channels, bars, hot-rolled and cold-rolled pipe, and rod. Castings are produced in the specialized plant of the Ministry of Chemical and Petroleum Machine Building.The technology of welding stainless steels and alloys is given in [15] and [16].TsNIIChERMET. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 10, pp. 43–50, October, 1967. 相似文献
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A. Yu. Tsivadze G. V. Ionova V. K. Mikhalko 《Protection of Metals and Physical Chemistry of Surfaces》2010,46(2):149-169
The possibility of using unique properties of lanthanides in the nanotechnology is demonstrated. The origination of linear
and nonlinear optical properties of lanthanide compounds with phthalocyanines, porphyrins, naphthalocyanines, and their analogs
in solutions and condensed state and the prospects of obtaining novel materials on their basis are discussed. Based on the
electronic structure and properties of lanthanides and their compounds, namely, optical and magnetic characteristics, electronic
and ionic conductivity, and fluctuating valence, molecular engines are classified. High-speed storage engines or memory storage
engines; photoconversion molecular engines based on Ln(II) and Ln(III); electrochemical molecular engines involving silicate
and phosphate glasses; molecular engines whose operation is based on insulatorsemiconductor, semiconductor-metal, and metal-superconductor
types of conductivity phase transitions; solid electrolyte molecular engines; and miniaturized molecular engines for medical
analysis are distinguished. It is shown that thermodynamically stable nanoparticles of Ln
x
M
y
composition can be formed by d elements of the second halves of the series, i.e., those arranged after M = Mn, Tc, and Re.
Prospects of using lanthanide superconductors in nanotechnology are considered. 相似文献
3.
《稀有金属材料与工程》2006,23(4):23-26
结合近年来现场试验与施工实践,分析研究了中小型镍材(工业纯镍)设备与管道的特点、性能、焊接缺陷与产生原因,以及防止与消除其缺陷、优化制造施焊质量的工艺措施,并总结了若干条注意事项。 相似文献
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金刚石、CBN有序排列及择优取向工具的研发及应用 总被引:1,自引:0,他引:1
有序排列/择优取向超硬材料工具的技术创新,将广泛适用于电镀、树脂、陶瓷、金属结合剂制品工具中,使用超硬材料颗粒在结合剂中均匀排列并择优定向,以最大潜能的发挥超硬材料各个方面固有的特性。并针对不同的加工对象,有选择性的使用超硬材料各自不同的特性,从而使超硬材料工具将以经济、高质与高效的优势替代传统的超硬材料工具并将进入新兴的加工领域,为生产企业带来新的发展机遇。本文将对有序排列与择优取向技术的研究现状及其在不同的金刚石工具中的应用做一阐述。 相似文献
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V. Kulikovsky V. Vorlí?ek M. Stranyánek R. ?tvrtlík A. Kurdyumov 《Surface & coatings technology》2008,202(9):1738-1745
Hydrogen-free amorphous and nanocrystalline films were prepared by magnetron sputtering of the SiC or Si targets. Mechanical properties (hardness, elastic modulus, intrinsic stress) and film structures were investigated in dependence on the substrate bias and temperature. It was found that both hardness and elastic modulus of all amorphous a-SiC films prepared at different substrate temperatures and biases are always lower than those for bulk α-SiC single crystal while the hardness of partially crystalline SiC films is higher and the elastic modulus lower than those for α-SiC one. In contrast, both hardness and elastic modulus of all amorphous Si films are always lower than those for nanocrystalline Si films which show approximately the same value as the Si single crystal. 相似文献
8.
钽及钽合金因具有优异的化学稳定性、高温力学性能、耐腐蚀性能以及加工成形能力,目前已被应用于航空航天、冶金化工以及核工业等诸多高新技术领域。针对钽及其合金巨大的应用潜力,国内外学者对其进行了深入广泛的研究,取得了丰富的研究成果。本文系统总结了钽合金材料体系类型及其应用领域,并从现有合金制备技术及其优缺点、主要合金体系的力学性能及其影响因素、高温防护涂层的体系及其制备方法等方面进行了系统介绍。最后,针对目前钽及其合金研究中存在的短板,对其未来的研究方向进行了展望。 相似文献
9.
软起动器及其应用设计和调试 总被引:1,自引:0,他引:1
软起动是电机起动一种新概念,跟传统的直接起动、星三角起动,自耦降压起动相比,有很大的优点。本文在介绍软起动的基础上,分析了软起动器在应用没计、现场调试及使用中应注意的问题。 相似文献
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J. Chris Johnston Ph.D. David A. Thompson 《JOM Journal of the Minerals, Metals and Materials Society》1993,45(10):14-19
Scientific visualization is the application of modern techniques in computer graphics to make the results of science and engineering studies more effective. Visualization allows the researcher to take in a large quantity of data at a single glance, developing an understanding of the data and the relationship between factors that would be difficult to obtain with a more conventional presentation. The addition of animation provides even greater power, enabling one to better understand the changes that occur over time. 相似文献
12.
采用电弧离子镀工艺在1Cr18Ni9Ti奥氏体不锈钢表面沉积TiN、AlN薄膜,通过扫描电镜、摩擦磨损试验和高温氧化试验等方法研究了薄膜的微观结构、化学成分与其摩擦性能和抗高温氧化性能之间的关系,同时探讨了薄膜的摩擦磨损机制和高温氧化机制。 相似文献
13.
Plasma alloying and spheroidization process and development 总被引:1,自引:0,他引:1
J. S. O’Dell E. C. Schofield T. N. McKechnie A. Fulmer 《Journal of Materials Engineering and Performance》2004,13(4):461-467
Elemental and blended refractory metal powders were processed using a plasma alloying and spheroidization (PAS) process. The
powders were characterized to determine changes in chemistry and morphology after processing. Five refractory metal powders
were evaluated during this investigation: (1) crystalline W, (2) spray dried Mo, (3) W-25 wt.% Re composite powder, (4) W-2
wt.% Re composite powder, and (5) Mo-40 wt.% Re composite powder. Benefits of the PAS process, such as a two-order of magnitude
reduction in oxygen contamination, production of highly spherical powders for enhanced flow characteristics, and the ability
to produce prealloyed powders were demonstrated.
This paper was presented at the 2nd International Surface Engineering Congress sponsored by ASM International, on September
15–17, 2003, in Indianapolis, Indiana, and appears on pp. 441–47 of the Proceedings. 相似文献
14.
Polishing and buffing: Theory and practice 总被引:1,自引:0,他引:1
There are many other aspects of buffing and polishing than these briefly discussed here. Though this very important contributor to the metal-finishing industry is still a great deal more an art than a science, basic engineering principles can be applied. With the proper melding of buff and compound, applied in a controlled fashion, optimum finish and maximum economy can be achieved. 相似文献
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采用水热合成法制备经精氨酸表面修饰和铕掺杂的羟基磷灰石纳米颗粒(HAP-Eu)。利用透射电镜(TEM)、Zeta电位分析仪、傅立叶红外光谱仪和X射线衍射(XRD)对HAP-Eu的成分、形貌、结构、晶粒粒径和Zeta电位进行表征,并通过成像流式细胞仪研究细胞活性。结果表明:制备的HAP-Eu粒径较均匀,约为100nm,特征峰明显;在pH=7.5时,颗粒的表面净电荷均值约为30.10mV;在人上皮细胞和内皮细胞中无毒性。 相似文献
17.
齿轮类零部件的选材及热加工分析 总被引:1,自引:0,他引:1
分析了齿轮类零部件材料的正确选择及热加工处理工艺(热处理工艺、焊接工艺).采用电子束焊接这类零部件,合理匹配齿轮的选材和热处理工艺,可有效防止在制造和运行时产生的失效,从而保证了零部件的制造质量和安全运行,提高了生产效率. 相似文献
18.
E. V. Kasatkin Yu. M. Stryuchkova 《Protection of Metals and Physical Chemistry of Surfaces》2012,48(5):572-584
Methods of scanning tunneling microscopy and its electrochemical variant can be effectively used for research on the nanoproperties of different materials when the experimenter knows clearly the possibilities of the equipment used. In some cases, the information available in the scientific literature does not entirely clearly and properly reflect the nature of the object, thereby confusing researchers. Devices for scanning probe microscopy, particularly scanning tunneling microscopy and electrochemical scanning tunneling microscopy, developed and manufactured by domestic instrument-making firms have a set of useful properties allowing one to perform various studies, including development of effective methods of modifying effects on different surfaces in order to obtain desired nanomaterials. 相似文献
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Si-containing a-C:H and a-C thin films with nitrogen, oxygen and transition metal (Cr and W) additives were deposited on polished single crystalline silicon substrates at room temperature by plasma activated CVD, magnetron-sputtering PVD and also by combined PACVD-PVD techniques.In particular Si-, Si-O- and Si-N-containing a-C:H films (denoted as a-C-Si, a-C-Si-O and a-C-Si-N) were deposited respectively from tetramethylsilane (TMS), hexamethyldisiloxane and hexamethyldisilazane vapourised precursors in He carrier gas by electron cyclotron wave resonance RF plasma. Cr-containing a-C:H films, further denoted as a-C-Si-Cr, were deposited with combined PVD-PACVD by sputtering chromium and carbon targets in argon and introducing TMS vapour. Wcontaining a-C films (denoted as a-C-Si-W) were deposited by PVD with simultaneous sputtering of the constituents in Ar. Detailed characterisation of the composition and chemical state of the elements present in the films were done by X-ray photoelectron spectroscopy (XPS) and X-ray induced Auger electron spectroscopy. Mechanical properties, hardness (H), reduced modulus (E) and scratch behaviour were studied by depth-sensing nanoindentation and scratch tests.In the a-C:H films, the C/Si ratio varied between 1.5 and 3.5 showing a significant deficiency of C as compared to the composition of the precursors. The Cr and W content in the a-C-Si-Cr and a-C-Si-W films varied in a very broad 2-50 at.% range.The chemical state of carbon was primarily of sp2 and partly of sp3 type C-C with XPS chemical shifts for C 1s at 284.3 eV and 285.0 eV, respectively. The Si in the films is bonded predominantly to carbon (Si 2p at 100.8 eV BE) or to nitrogen in N-containing films (Si 2p at 101.3 eV BE). In the a-C-Si-Cr films Cr-C bonding states were determined (Cr 2p3/2 at 574.5 eV and C 1s at 282.8 eV). Si formed predominantly Si-C and also Si-Cr bonds. In the a-C-Si-W, films C-Si and C-W (W 4f7/2 at 32.3 eV) chemical bonds could be identified.It was discovered that the modified Auger parameter for silicon, αSi (derived from the Si 2p electron and Si KLL Auger line energy), sensitively reflects the entire chemical structure of these films, including crosslinking and densification. These spectroscopic data, supported further by the increase of the bulk plasmon loss energy of the C 1s peak, were directly connected with the mechanical properties of these films. The amorphous nature of the films was deduced from the chemical state analysis and was verified also by transmission electron microscopy (TEM) and electron diffraction (ED) studies.Hardness and elastic modulus of the a-C-Si-(O,N) films could be adjusted in a wide range of approx. 5-15 GPa and 40-140 GPa, respectively. Systematic alteration of these values with the composition (C/Si, O/Si and N/Si atomic ratio) and with the chemical structure (αSi?) was established and their interrelations are discussed. Whilst incorporation of Cr does not alter the mechanical properties, the addition of W increases H and E up to 19 GPa and 210 GPa, respectively. 相似文献