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Design and implementation of a non-contact X-Y table with high temperature superconductors

Design and implementation of a non-contact X-Y table with hi...

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2005 IEEE International Conference on Mechatronics, ICM '05

作者： Chen, Hang-Sheng Wang, Chun-Chih Lai, Wen-Chien Tsai, Ming-Hsun Chen, In-Gann Cheng, Ming-Yang Tsai, Mi-Ching Dept. of Mechanical Engineering National Cheng Kung University Tainan Taiwan Dept. of Materials Science and Engineering National Cheng Kung University Tainan Taiwan Dept. of Electrical Engineering National Cheng Kung University Tainan Taiwan

ISBN: (纸本)0780389980

The use of high temperature superconductors (HTS) in the levitation system has received considerable attentions since it was discovered In 1987. One of the unique characters of HTS is its flux trapping capability, which enables a stable lvitation/suspension over a permanent magnet. In this paper, a non-contact X-Y table that uses HTS bulks and its flux traping property is proposed. This X-Y table is composed of a mover with three superconductors and a stator with electromagnets and permanent magnets. Due to the special properties of the superconductor bulks, such as the Melssner effect and the flux pinning effect, there Is no mechanical contact or wear between the mover and the stator during the positioning process. Experimental results demonstrate the feasibility of proposed non-contact X-Y table. © 2005 IEEE.

关键词： High temperature superconductors

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Cutting characteristics in edge moving type of long life precision cutting method 5

Cutting characteristics in edge moving type of long life pre...

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5th International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2005

作者： Yasui, Heiji Hoda, Shingo Dept. of Mechanical Engineering and Materials Science Kumamoto University 2-39-1Kurokami Kumamoto860-8555 Japan

The improvement of the tool life in cutting operations such as turning, planing, milling and so on is always one of the most important subject. The tool life is closely related to the cutting temperature. From the point of view, in the research, the new type of tool shank attaching a small motor for the edge moving type of cutting method which is considered to have the useful effect on repressing the cutting temperature rise is developed. Using the shank, the tool life in the edge moving type of turning method is examined and found to become over forty five times more than the edge fixing type of cutting method.

关键词： Cutting tools

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Polisher life in ultra-high pressure and ultra-high speed polishing of NiP plated aluminum magnetic disk substrate

Polisher life in ultra-high pressure and ultra-high speed po...

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20th Annual Meeting of the American Society for Precision engineering, ASPE 2005

作者： Yasui, Heiji Yamaguchi, Kanta Yamasaki, Yutaka Matsukawa, Seiji Kuribayashi, Shoji Niki, Takuya Dept. of Mechanical Engineering and Materials Science Kumamoto University 2-39-1 Kurokami Kumamoto 860-8555 Japan

ISBN: (纸本)1887706399

The main results obtained are as follows: (1) The removal rate with polishing process changes in the four steps, which are the initial removal rate reducing step, the steady removal rate step, the later removal rate reducing step and the extremely small removal rate step. (2) The polishing pressure and speed, and polishing process have little influence on surface smoothness. (3) The removal rate in ultra-high pressure and speed polishing is over several times larger than the maximum rate in the usual polishing condition. (4) In the condition of ultra-high pressure and speed, the polisher surface is kept freshly black beyondthe removal dept. corresponding to the life time in the usual polishing condition.

关键词： Polishing

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Possibility of ultra-precision cutting of titanium alloy with diamond tool

Possibility of ultra-precision cutting of titanium alloy wit...

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20th Annual Meeting of the American Society for Precision engineering, ASPE 2005

作者： Sakamoto, Shigehiko Shinozaki, Akira Yasui, Heiji Dept. of Mechanical Engineering and Materials Science Kumamoto University 2-39-1 Kurokami Kumamoto 860-8555 Japan

ISBN: (纸本)1887706399

The main conclusions obtained are as follows;(1) Using small dept. of cut, the ultra-precision cutting with diamond tool is available for finishing beta titanium alloy to the surface roughness of below 100 nm (Rz) in feed rate of below 50 micro-meters/rev. (2) Until the cutting length of 6,000 m, the surface roughness of beta titanium alloy at feed rate of 50 micro-meters/rev are below 97 nm (Rz) or 20 nm (Ra). High crystal grain boundary steps observed at large dept. of cut is not observed on the finished surface. (3) In feed rate of 50 micro-meters/rev, the surface roughness of below 200 nm (Rz) is kept until the cutting length of 20,000 m.) The surface roughness of beta titanium alloy obtained experimentally at feed rate of 50 micro-meters/rev is almost the same as the theoretical value.

关键词： Surface roughness

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Influence of adhesion to cutting edge on surface roughness in ultra-precision cutting of stainless steels with coated-cemented-carbide tool

Influence of adhesion to cutting edge on surface roughness i...

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20th Annual Meeting of the American Society for Precision engineering, ASPE 2005

作者： Yasui, Heiji Sakamoto, Shigehiko Hayashi, Hirofumi Shingai, Takafumi Dept. of Mechanical Engineering and Materials Science Kumamoto University 2-39-1 Kurokami Kumamoto 860-8555 Japan

ISBN: (纸本)1887706399

The influence of adhesion to cutting edge on surface roughness in ultra-precision cutting of stainless steels is examined from the point of cutting fluids. The main conclusions obtained are as follows: 1) Compared with water-immiscible type and soluble type "B" of cutting fluid, soluble type "A " of cutting fluid is considerably useful for repressing the adhesion of stainless steel to cutting edge, reducing the tool wear and, as the results, improving the surface roughness. 2) Using the soluble type "A" of cutting fluid, the surface roughness attains about 40nm (Rz) in three dimensional measurement or about 20nm (Rz) in two dimensional measurement. 3) Using soluble type, "A" of cutting fluid, the surface roughness is kept below 40nm (Rz) or 100nm (Rz) until the cutting length of about 1,200m or 3,000m, respectively. 4) Using soluble type "A" of cutting fluid, the face-turned SUS304 surface becomes the similarly smooth surface as the SUS316. (figure presented).

关键词： Adhesion

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Development of gearless polishing machine for high removal rate and ultra-smoothness double side surface polishing 5

Development of gearless polishing machine for high removal r...

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5th International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2005

作者： Yasui, Heiji Yamaguchi, Kanta Kuribayashi, Shouji Dept. of Mechanical Engineering and Materials Science Kumamoto University 2-39-1Kurokami Kumamoto860-8555 Japan

High efficient and ultra-smoothness double side surface polishing method based on the new concept is devised. To examine the polishing effect by using the polishing method, the new type of gearless polishing machine is developed. The machine is available for the experiment up to polishing pressure of 60kPa and polishing speed of 18m/s in the specification of the design. The mechanism ofgearless polishing machine is based on rotating the workpiece by the friction force of reverse directions to each other, which are caused from the contact between workpiece and upper or lower polishing plate. From some examinations on polishing of magnetic disk substrate, the method is ascertained useful for ultrasmoothness polishing with high removal rate.

关键词： Polishing machines

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Understanding damage accumulation upon AA7075-T651 used in airframes from a microstructural point of view

Understanding damage accumulation upon AA7075-T651 used in a...

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materials science and Technology 2005 Conference

作者： Birbilis, N. Cavanaugh, M.K. Buchheit, R.G. Harlow, D.G. Wei, R.P. Dept. of Materials Science and Engineering Ohio State University Columbus OH 43210 United States Dept. of Mechanical Engineering and Mechanics Lehigh University Bethlehem PA 18015 United States

ISBN: (纸本)0873396456

Corrosion and corrosion fatigue of aircraft components remains a critical issue for the service readiness of aging aircraft. The favorable mechanical properties of AA7075-T651 arise as a result of a heterogeneous microstructure that compromises the corrosion resistance of the alloy, ultimately resulting in localized corrosion. Understanding the factors that govern extent, rate and morphology of damage accumulation is essential in developing models to predict corrosion and corrosion fatigue resistance. The electrochemical properties of AA7075-T651 have recently been investigated on a phase-by-phase basis. As a result, quantitative microstructural characterization of AA7075-T651 takes on a critical importance in the understanding of corrosion damage accumulation, based on localized chemistry (and hence electrochemistry) of the alloy. This work presents results of a study using analytical microscopy (SEM, TEM, STEM, EDXS, EBKP) to reveal what phases, intermetallics and particles constitute AA7075-T651;allowing characterization and discrimination on a chemical basis. Knowledge of the type of localized chemistry that exists may be coupled with electrochemical results and used to typify damage accumulation processes on the nano and microscale.

关键词： Corrosion fatigue

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Frictional and electrical properties of multiwalled carbon nanotubes

Frictional and electrical properties of multiwalled carbon n...

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2005 World Tribology Congress III

作者： Dickrell, P.L. Pal, S.K. Ajayan, P.M. Raravikar, N.R. Schadler, L.S. Sawyer, W.G. Dept. of Mechanical and Aerospace Engineering University of Florida Gainesville FL 32611 United States Dept. of Materials. Science and Engineering Rensselaer Polytechnic Institute Troy NY 12180 United States

ISBN: (纸本)0791842029

This presentation examines the tribological properties and contact resistance of oriented capped carbon multiwalled nanotube (MWNT) films. Highly anisotropic tribological behavior of MWNT films oriented in mutually orthogonal directions is observed. The average values of coefficient of friction varied from high values (μ=0.795) for vertically aligned nanotubes grown on rigid substrates to low values (μ=0.090) for the same nanotubes dispersed flat on the same substrates. The results were insensitive to humidity, which is in contrast to graphite materials. The multiwalled nanotube layers also had a monotonic decrease in friction coefficient with increased surface temperature in both orientations, having a 32% drop in friction coefficient over a 73°C temperature rise. Preliminary results from contact resistance measurements of nanotube films grown through a porous alumina are investigated as a function of applied static load. Copyright © 2005 by ASME.

关键词： Carbon nanotubes

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Vertically aligned carbon nanotubes field emission devices fabricated by furnace thermal CVD at atmospheric pressure

Vertically aligned carbon nanotubes field emission devices f...

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Technical Digest of the 18th International Vacuum Nanoelectronics Conference, IVNC 2005

作者： Wei, S. Kang, W.P. Davidson, J.L. Hofmeister, W.H. Choi, B.K. Huang, J.H. Interdisciplinary Program in Materials Science Vanderbilt University Nashville TN 37235 United States Dept. of Electrical Engineering and Computer Science Vanderbilt University Nashville TN 37235 United States Dept. of Materials Science and Engineering National Tsing Hua University Hsinchu 300 Taiwan

ISBN: (纸本)0780383974

The field emission behavior of carbon nanotubes (CNTs) in terms of their potential applications in vacuum microelectronics has been studied extensively in recent years. CNTs have extraordinary strength, impressive thermal and chemical stabilities and excellent electronic properties beneficial for making field emission cathodes. A vertically aligned CNT cathode is a beneficial geometrical structure for achieving high performance vacuum micro- and nano-electronic devices such as field emission diodes, triodes and flat panel displays. Although the vertical alignment of CNTs has been achieved in many ways[1-3], less experimentation has been conducted at ambient pressure using a simple tube furnace which would be a most promising method to mass produce CNTs by catalytic chemical vapor deposition (CVD). In this work, Ni catalytic film was deposited on SiO2 substrates and CNTs synthesis was performed in a quartz tube furnace. NH3 was applied with acetylene (C2H2) to produce vertically aligned CNTs. The catalyst deposition parameters and C2H2/NH3 flow rates are critical to the size and density of Ni catalytic particles, which strongly affect the morphology of as-grown CNTs. The temperature and pressure at which CNTs were grown were at 750°C and 1 atm., respectively. During the experiments, a mixture of Ar (80 vol.%) and H2 (20 vol.%) was introduced into the furnace at room temperature, the furnace was then heated to 750°C at the rate of 15°C/min. When the temperature was stabilized, NH3 was introduced as a processing reagent, followed by C 2H2, the carbon source. The effects of NH3 on the size and density of Ni particles were investigated, and the mechanism of CNT alignment was analyzed. Specifically, ammonia breaks larger catalyst particles into smaller ones, thereby increasing the particle density. The size of catalyst particles is critical, because CNTs cannot grow if the diameter of catalyst particles is far beyond the diffusion length of carbon atoms[4]. Moreover, NH3

关键词： Carbon nanotubes

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Environmentally benign materials for electronics: A review of current developments and emerging technologies

Environmentally benign materials for electronics: A review o...

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2005 10th International Symposium on Advanced Packaging materials: Processes, Properties and Interfaces

作者： Lincoln, John D. Ogunseitan, Oladele A. Saphores, Jean-Daniel M. Schoenung, Julie M. Nixon, Hilary Shapiro, Andrew A. Dept. of Chemical Engineering and Materials Science University of California Irvine Program in Industrial Ecology Dept. of Environmental Health Science and Policy UCI Dept. of Planning Policy and Design UCI Dept. of Materials Science University of California Davis Jet Propulsion Laboratory California Institute of Technology Pasadena

ISBN: (纸本)0780390857

materials used in handheld consumer electronic devices (CEDs), such as cell phones or personal digital assistants, create environmental risks both during procurement and disposal. The increasing global demand for CEDs and recent legislative pressure motivate our review of alternative materials that could make CEDs more environmentally friendly. Hazardous materials considered include brominated flame retardants, lead-based solders, hexavalent chromium, and copper. We survey recent research in the development of environmentally benign replacement materials, provide a brief assessment of the potential environmental, industrial, and economic consequences of their substitution, and assess progress in their industrial application. Identifying appropriate environmentally benign replacement materials provides a starting point for developing environmentally friendly CED prototypes. © 2005 IEEE.

关键词： Consumer electronics

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