检索结果-内蒙古大学图书馆

Corrosion 2007

作者： Dryepondt, S. Pint, B.A. Zhang, Y. Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge TN 37831-6156 United States Dept. of Mechanical Engineering Tennessee Technological University P.O.Box 5014 Cookeville TN 38505-0001 United States

Thin pack and chemical vapor deposited (CVD) aluminide coatings on commercial ferritic martensitic Fe-9Cr-2W steel are being investigated by creep and corrosion testing at 650C. Mass gain results indicate that these coatings are protective at 650C in humid air. Comparison with bare material shows that the coated region makes no contribution to the creep strength. The consumption of metal due to the exposure in water vapor of uncoated specimens is compensated by the growth of a load-bearing oxide scale. Pre-oxidation of the alloy in humid air also affects the alloy microstructure. © 2007 by NACE International.

关键词： Steel corrosion

来源：评论

学校读者我要写书评

暂无评论

Pressure driven flow into a slit and the onset of clogging

Pressure driven flow into a slit and the onset of clogging

引用

Coating and Graphic Arts Conference 2007, TAPPI

作者： Iyer, Rajan Basciano, Chris Lyons, Tony Bousfield, Douglas W. IMERYS 618 Kaolin Rd. Sandersville GA 31082 United States North Carolina State University Dept. of Mechanical and Aerospace Engineering Raleigh NC 2795 United States Paper Surface Science Program Department of Chemical Engineering University of Maine Orono ME 04469-5737 United States IMERYS University of Maine

ISBN: (纸本)9781604239690

Pressure driven flows of fluid suspensions through narrow geometries are often encountered in various applications in the paper industry. Pre-metering of coating suspensions are gaining increasing attention to overcome the requirement of overapplying materials to a surface and scraping off a majority of it and putting it through recirculation. Curtain coating and spray applications are up and coming technologies for high speed coating. Developments in understanding of particle shape and size and their distributions have brought new products for the market that allow application of ultra-thin layers for maximum efficiencies. These pigments have rheological challenges that need to be overcome with formulation design and application designs. The rheological challenges are being understood better with new developments in coating rheology characterization using instruments that can operate in near-process conditions, such as the capillary and slit-die rheometers. Combining the developments in pigment design, application design and instrumentation designs it is clear that a good understanding of these processes is needed to visualize the processes and the dynamic conditions that occur. Some of the phenomena that are encountered with these premetering devices and the rheometers themselves non-laminar flows and logjam effects of particles in the vicinity of converging geometry. In recent work reported on the application of curtain coating of paper, the coating must flow through fine gaps without clogging before the process is expected to operate free of defects. A good understanding of the mechanisms of clogging is lacking in the literature. In this work experiments with a slit rheometer are compared to finite element model and a lubrication based computer model to relate pressure drop in the slit to viscosity and flow rates. A good agreement is found between the models and the experiments. A particle dynamics model for flow into a slit is developed. Particles are found to

关键词： Coatings

来源：评论

学校读者我要写书评

暂无评论

Void diffusion coefficient in two-phase void drift for several channels of two- and multi-subchannel systems

引用

Multiphase science and Technology 2006年第1期18卷 31-54页

作者： Kawahara, A. Sadatomi, M. Kano, K. Sasaki, Y. Kudo, H. Dept. of Mechanical Engineering and Materials Science Kumamoto University Kurokami 2-39-1 Kumamoto City 860-8555 Japan

To improve a void drift model incorporated in a subchannel analysis code, experimental data have been obtained for vertical air-water two-phase flows in several test channels of two- and multi-subchannel systems. In order to know the effects of the lattice of fuel rods on the void drift, the channels made up of two subchannels i.e., the two-subchannel system surrounded by square lattice rods or triangle tight lattice rods were included in the experiment. In addition, to know the effects of the number of subchannels, as the multi-subchannel system the channel consisted of six subchannels simulating a square lattice BWR fuel rod bundle was included. In each test channel, the data have been collected on the axial redistributions of flow rates of both phases and void fraction in the respective subchannels. In order to study the effects of two-phase flow regimes or void fraction on the void drift, the flow regimes covered were slug, churn and annular flows with various combinations of air and water flow rates. By fitting the above data with Lahey et al.'s void settling model, we have determined a void diffusion coefficient in their model. The void diffusion coefficient data were compared between the respective test channels as well as Tapucu et al.'s data for a square lattice two-subchannel system. It was found that the void diffusion coefficient was much smaller in the tight lattice channel than the square lattice channels, i.e., a channel size effect. Furthermore, the void diffusion coefficient could be well correlated with the turbulent Peclet number using a subchannel geometry factor, regardless of both the gap clearance between subchannels and the number of subchannels. It was also found that the correlation depends on the rod lattice.

关键词： Two phase flow

来源：评论

学校读者我要写书评

暂无评论

Effect of N on microstructure and mechanical properties of as-cast Ti-6Al alloy

引用

Journal of Harbin Institute of Technology(New Series) 2006年第1期13卷 65-69页

作者：王宏伟米国发朱兆军曾松岩 School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001China Dept. of Mechanical Engineering Henan Polytechnic University Jiaozuo 454150China

In-situ titanium matrix composites with N content of 0. 045-0. 27 wt% have been produced by a easting method. The microstructure and mechanical properties of as-cast materials have been observed and tested. The results show that when N content in Ti-6Al alloy is between 0. 045 wt% and 0. 27 wt%, the reinforcement is a compound of Ti, Al and N, and volume fraction of reinforcements increases with an increase of N content. The hardness, compressive strength and elastic modulus are all higher than that of the matrix alloy. With the increase of N content, the compressive strength, the hardness and the elastic modulus increase. Fracture surface analysis has also shown that the matrix alloy fractures in a ductile model and the composites fracture in a cleavage brittle model with characteristics of dimple and cleavage surface.

关键词： Ti-6Al alloy Nitride as-cast microstructure mechanical properties

来源：评论

学校读者我要写书评

暂无评论

Fabrication and tribological properties of hard coatings with embedded solid lubricant phases

Fabrication and tribological properties of hard coatings wit...

引用

STLE/ASME International Joint Tribology Conference, IJTC 2006

作者： Krzanowski, James E. Zimmerman, John H. Mechanical Engineering Dept. Materials Science Program University of New Hampshire Durham NH 03824 United States

ISBN: (纸本)0791837890

The fabrication of nanocomposite coatings consisting of a hard matrix and solid lubricant islands holds promise developing highly wear resistant coatings with low friction coefficients. We have conducted research on methods for creating hard coating layers with a pattern of holes that can act as reservoirs for solid lubricant phases. The requirements for this method include low cost and the ability to create holes with nearly 1:1 aspect ratios. We first investigated methods to disperse polymer or ceramic microspheres on the substrate, followed by deposition of hard coatings (typically 1-3 microns thick) and then removal of the microspheres. This method resulted in a random distribution of 3 micron holes in the coating, and also permitted deposition of the hard coatings at elevated temperatures. The second part of this study investigated the behavior of a solid lubricant (molybdenum disulphide) when deposited on the surface in thin-film form and a powder (graphite) in liquid suspension form. The effectiveness of the patterned hole structure will be discussed in terms of the ability to reduce friction and wear. Copyright © 2006 by ASME.

关键词： Coatings

来源：评论

学校读者我要写书评

暂无评论

Abstracts for the 6th Congress of Asian Sleep Research Society

引用

Sleep and Biological Rhythms 2009年第4期7卷 A1-A49页

作者： Seog Ju Kim In Kyoon Lyoo Yu-Jin Lee Do-Un Jeong Hirohiko Kanai Masanori Ookubo Atsushi Yoshimura Masako Okawa Noto Yamada Takeshi Munezawa Yoshitaka Kaneita Yoneatsu Osaki Hideyuki Kanda Tadahiro Ohtsu Masumi Minowa Kenji Suzuki Susumu Hijuchi Hiroyuki Suzuki Takashi Ohida Takashi Abe Yoko Komada Shoichi Asaoka Yuichi Inoue Jin-Seong Lee Sang-Yong Cho Deependra Kumar Hruda N. Mallick Velayudhan M. Kumar Mahesh K. Kaushik Akihiro Karashima Noiihiro Katayama Mitsuyuki Nakao Ravindra P. Nagendra Sathiamma Sulekha Sathyaprabha T. Narasappa Pradhan Nityanadan Bindu M. Kutty M. Nirmala P. N. Ravindra Basavaraj Ramappa Tubaki T. N. Sathyaprabha D. Sudhakar G. S. Lavekar C. R. Chandrashekar Kazuyoshi Kitaoka Mika Shimizu Sachiko Chikahisa Kazuo Yoshizaki Hiroyoshi Sei Jong-Won Kim Misa Takegami Shin Yamazaki Yasuaki Hayashino Rei Ono Koji Otani Miho Sekiguchi Shinichi Konno Shunichi Fukuhara Antonia J. Jakobson Paul Fitzgerald Russell Conduit Xin Shirley Li Siu Ping Joyce Lam Wai Man Mandy Yu Yun Kwok Wing Kazue Okamoto-Mizuno Koh Mizuno Mituaki Yamamoto Shuichiro Shirakawa Hirokazu Doi Mikako Kato Kazuyuki Shinohara Masako Tamaki Shiori Matsuda Katsuo Yamazaki Tadao Hori Keiko Ogawa Kazumi Takahashi Kunio Kitahama Katuo Yamazaki Yoshimasa Koyama Kohei Shioda Yugo Ueda Yukiko Nakamura Clara Inoue Kazushige Goto Sunao Uchida Yuko Morita Yoshiko Honda Tohru Kodama Mari Hagihara Toru Nakajima Masato Saito Yoshihiko Koga Shinichiro Tanaka Hiroshi Yamadera Madoka Takahara Sachiko Suwa Minoru Onozuka Sadao Sato Fumiharu Togo Taiki Komatsu Takeshi Mitani Jongbae Choi Bin Zhang Taeko Sasai Hiromi Mitsubayashi Mitsuhiro Ohtsu Isao Hasegawa Tatsuya Ishii Akira Komori Asami Suzuki Yue Nakahara Mitsuyasu Hiroki Mariko Nakauma Nobuo Someya Tomomasa Ochiai Shouhei Komori Rayleigh Ping-Ying Chiang Zai-Ting Yeh Seong T. Kim Seung H. Yoon Jeong S. Kwon Jong H. Choi Hyung J. Ahn Youngsoo Kim Bolortuya Yunren Lichao Chen Radhika Basheer Robert W. Mccarley Robert E. Strecker Makoto Honda Tetsuaki Arai Miyuki Fukazawa Yutaka Honda Kuniaki T Department of Psychiatry Gachon University of Medicine and Science Incheon Republic of Korea Department of Psychiatry Seoul National University Seoul Republic of Korea Department of Neuropsychiatry and Center for Sleep and Chronobiology Seoul National University Hospital Seoul Republic of Korea Department of Neuropsychiatry Seoul National University Hospital Seoul Republic of Korea Seoul National University Hospital Seoul Republic of Korea Department of Psychiatry Shiga University of Medical Science Otsu Japan Division of Public Health Department of Social Medicine Nihon University School of Medicine Tokyo Japan Department of Public Health Nihon University School of Medicine Tokyo Japan Division of Environmental and Preventive Medicine Department of Social Medicine Faculty of Medicine Tottori University Yonago Japan Department of Hygiene and Preventive Medicine Fukushima Medical University Fukushima Japan Department of Public Health Showa University School of Medicine Tokyo Japan Faculty of Humanities Seitoku University Matsudo Japan Section on Behavioral Science Division of Clinical Research National Hospital Organization Kurihama Alcoholism Center Yokosuka Japan Department of Otolaryngology Second Hospital Fujita Health University Nagoya Japan National Hospital Organization Kurihama Alcoholism Center Kanagawa Japan Metropolitan Police Department Criminal Investigation Laboratory Tokyo Japan Japan Somnology Center Neuropsychiatrie Research Institute Tokyo Japan Department of Somnology Tokyo Medical University Tokyo Japan Japan Somnology Center Neuropsychiatric Research Institute Tokyo Japan Department of Somnology Tokyo Medical and Dental University Tokyo Japan Center for Sleep and Chronobiology Department of Psychiatry and Behavioral Science Seoul National University College of Medicine Seoul Republic of Korea Department of Psychiatry and Behavioral Science Center for Sleep and Chronobiology Seoul Republic of Korea Department of Physiology Al

来源：评论

学校读者我要写书评

暂无评论

In-situ study of the effect of electromigration on strain evolution and mechanical property change in lead-free solder joints

In-situ study of the effect of electromigration on strain ev...

引用

IEEE 56th Electronic Components and Technology Conference

作者： Ren, Fei Xu, Luhua Zhang, Xi Nah, Jae-Woong Pang, John H. L. Tu, K.N. Dept. of Materials Science and Engineering UCLA Los Angeles CA 90095 Dept. of Mechanical and Aerospace Engineering NTU Singapore Singapore

ISBN: (纸本)1424401526

We report a localized mechanical property study by using the nano-indentation continuous stiffness measurement (CSM) technology on Pb-free solder joints with and without electromigration. The tensile test structure of a solder ball connected by two Cu wires of 300um diameters was prepared and tested. At 100°C, the applied current density was from 0 A/cm2 to 5×103 A/cm2 and the time from 3 to 144 hrs. An array of 500 nm indentations was created by the nano-indenter from the cathode area, across the bulk of the solder, to the anode area. The change of Young's modulus and the hardness at the cathode and the anode was calculated from the CSM. The results show that, the Young's modulus and the hardness of the anode were higher than the original values. And it increases with increasing electromigration time or higher current density. On the other hand, the Young's modulus and hardness at the cathode were lower than the original values and they decrease with increasing electromigration time or higher current density. Therefore, there is a change of mechanical properties at the cathode and the anode of the lead-free solder joints due to electromigration. Furthermore, an in-situ Micro-DISC technology, digital image speckle correlation technology, was used to study the strain evolution at the lead-free solder joints during electromigration. It is found that, during electromigration, with the atoms moving from the cathode to the anode, a tensile strain was created at the cathode region;while a compressive strain was observed at the anode region. And the strain difference between the cathode and anode kept increasing with the time of electromigration. The localized mechanical property change in the lead-free solder joints due to electromigration will be discussed. © 2006 IEEE.

关键词： Electromigration

来源：评论

学校读者我要写书评

暂无评论

Investigation on high dept. of cut of ultra-smoothness grinding of a glass by means of newly developed grinding method 6

Investigation on high depth of cut of ultra-smoothness grind...

引用

6th International Conference European Society for Precision engineering and Nanotechnology, EUSPEN 2006

作者： Yasui, H. Yamamoto, Y. Miyamoto, K. Furuya, S. Dept. of Mechanical Engineering and Materials Science Kumamoto University Japan Graduate School of Kumamoto University Japan

ISBN: (纸本)0955308208

Glass is one of the most important materials for the ultra-precision component. The high productive ultra-smoothness grinding technique of glass has been strongly required. From the point of this view, in the research, high dept. of cut of grinding of a glass by means of the newly developed ultra-smoothness grinding method is examined. The dept. of cut ranges from 5 μm to 1 mm. In the ultra-smoothness grinding method, it is found possible to finish the glass to near the ultra-smoothness surface at the dept. of cut of 30 μm using metal bonded diamond wheel of coarse grain size of #140. The surface roughness of glass formed at the dept. of cut of 30 μm attains about 50 nm(Rz) or 5 nm(Ra).

关键词： Glass

来源：评论

学校读者我要写书评

暂无评论

Tribological Properties of Sputter-Deposited MoS 2 Films Containing Titanium

引用

MRS Online Proceedings Library 2006年第1期890卷 1-6页

作者： E. Krzanowski James Dyumani Nunna Mechanical Engineering Dept. and Materials Science Program University of New Hampshire Durham USA

The tribological properties of sputter-deposited MoS2 and MoS2-Ti films were investigated in this study. The deposited films were characterized using microprobe analysis for composition and x-ray diffraction (XRD) for structure. The frictional properties of the films were examined using a pin-on-disk (POD) with counterfaces of 440C steel, aluminum, tungsten carbide and alumina. The tests were run under low (25%), medium (50%) and high (70%) humidity levels. MoS2 films without Ti were first examined under cyclic humidity conditions between 25 and 50% R/H. The results showed that for steel, WC and alumina counterfaces, the effect of the higher humidity was to increase the friction, but lower friction could be recovered when the humidity was reduced back to 25%. For films containing Ti, the best results were obtained at a concentration of 20 at. % Ti. These films performed well for steel and WC counterfaces, but poorly against aluminum. The effect of deposition temperature (up to 450oC) was examined for MoS2 and MoS2-5% Ti films. Higher temperatures yielded more crystalline films, but the addition of Ti partially countered this effect. The POD test showed that at medium humidity levels the friction decreased with temperature, but increased slightly when tested under low humidity. In all cases, the 5% Ti-containing films had a fiction coefficient of about 0.1 below that for films without Ti.

关键词： lubricant sputtering x-ray diffraction (XRD)

来源：评论

学校读者我要写书评

暂无评论

Influence of processing parameters on microstructure of pulsed laser deposited Au thin films

Influence of processing parameters on microstructure of puls...

引用

2006 MRS Fall Meeting

作者： Kulovits, Andreas Leonard, John Wiezorek, Jorg Dept. of Mechanical Engineering and Materials Science University of Pittsburgh 848 Benedum Hall Pittsburgh PA 15261 United States

ISBN: (纸本)9781604234282

It has long been recognized that thin film polycrystalline microstructures are determined by the thermodynamics and kinetics associated with physical vapor deposition, but it is quite process dependent and not easily quantified. We have examined the microstructure in polycrystalline Au films obtained by pulse laser deposition (PLD) under various conditions and interpret the results in terms of three fundamental parameters common to all physical vapor deposition: Flux kinetic energy, substrate temperature, and deposition rate. With this model, it is predicted that nanocrystalline films are formed in the limits of low temperature, flux, and high deposition rate. The deposited films are analyzed with X-ray diffraction and SEM to determine texture and grain morphology, which are found to fit well within in the process maps. © 2007 materials Research Society.

关键词： Thin films

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：