Journal of the Society of Powder Technology, Japan
Online ISSN : 1883-7239
Print ISSN : 0386-6157
ISSN-L : 0386-6157
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Volume 42, Issue 2
Displaying 1-8 of 8 articles from this issue
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  • Study on Manipulation and Welding Method of Fine Particles Using Microprobe
    Takeshi Konno, Mikihiko Kobayashi, Mitsuru Egashira, Norio Shinya
    2005 Volume 42 Issue 2 Pages 98-104
    Published: February 10, 2005
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.42.98
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    A new particle manipulator composed of a tungsten probe, a worktable with a stage system and two optical microscopes is fabricated. The apparatus is featured by an equipment of power source, which applies voltage between the probe and a substrate on the worktable. Using gold particles of 40-80μm, the performance of the apparatus is examined. The experiments show that manipulation and welding can be carried out as follows. The probe is positioned for the tip to touch an objective particle on the substrate. The particle is adhered at the tip of the probe and is picked up when 20-50V is applied between the probe and the substrate. The particle is carried to a predetermined point on the substrate and the particle on probe is put in contact with the substrate surafce. By applying 4kV or more, electric sparks generated between the probe and the substrate, and the particle is welded to the substrate. The apparatus has an advantage that both manipulation and welding can be carried out using the same tool saving operation time and improving the accuracy of products.
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  • Effects of Gas Flow Rate on Particulate Contamination in a PECVD Reactor
    Yutaka Hayashi, Manabu Shimada, Kikuo Okuyama, Nobuki Kashihara, Heru ...
    2005 Volume 42 Issue 2 Pages 105-109
    Published: February 10, 2005
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.42.105
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    The effects of gas flow rate on the contamination by dust particles in an RF plasma reactor were studied experimentally. A mixture of tetraethylorthosilicate vapor, oxygen and nitrogen were fed into the reactor to fabricate SiO2 thin film. Dust particles generated in the plasma were visualized by a laser light scattering technique. Particle size was measured by a laser particle counter, and particle deposition for the film was observed by a scanning electron microscope. The dust particles were found to be trapped in a certain region in the reactor. The amount and size of the trapped particles decreased with increasing gas flow rate. The particle contamination on the film surface also decreased with increasing gas flow rate. At a high flow rate, however, dust particles embedded into the film were observed. In addition, high gas flow rate degraded the film uniformity. It is considered from the above results that a proper selection of gas flow rate is important to decrease particulate contamination as much as possible.
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  • Size Classification of Solder Balls by Twin Roller System
    Shuji Matsusaka, Kenji Muranishi, Hiroaki Masuda
    2005 Volume 42 Issue 2 Pages 110-115
    Published: February 10, 2005
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.42.110
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    The performance of twin roller system developed for size classification of spherical particles has been studied experimentally. The particles used are solder balls of several hundreds micrometers in diameter. The experimental apparatus consists of a hopper, a feeder, a twin roller unit, and a series of containers. The two rollers are arranged at a certain inclination with a small opening angle. The particles that are fed from the feeder move along the gap between the rollers, and fall down at a point where the width of the gap exceeds the diameter of the particles; then they are collected into the containers. The velocity of particles moving on the rollers is the important parameter to determine the total number of particles classified per unit time. The experimental results show that the particle velocity is proportional both to the angular velocity of the rollers and to the tangent of the inclination angle. The accuracy of the size classification is within +/-0.1%.
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  • Numerical Simulation of Constitution Relationship between Stress and Strain of Particulate Matters
    Shinichi Yuu, Toshihiko Umekage
    2005 Volume 42 Issue 2 Pages 116-124
    Published: February 10, 2005
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.42.116
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    The relations between normal stress and normal strain and that between shear stress and shear strain, which are the constitution relationships, have been obtained in a simple and general particulate field by the numerical simulation using Distinct Element Method. We calculate the dynamics of particulate matters using the continuum model based on these relations. Furthermore, the numerically calculated constitutive relations are formulated in order to use them for the continuum model simulation. The constitution relationships presented in this work confirm the following:
    (1) Stresses are functions of strains and packing ratios.
    (2) The constitution relationship of particulate matters has a hysteresis because of the change in the internal state of the particulate matters.
    (3) Particulate matters are deformed more easily by the shear stress than the normal stress.
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  • Electrostatic Discharge from a Fine Particle in Normal Air
    Yoji Nakajima
    2005 Volume 42 Issue 2 Pages 125-133
    Published: February 10, 2005
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.42.125
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  • Estimation of Mechanochemical Reaction Rate and Optimum Design of Planetary Ball Mill by Discrete Element Method
    Hiroshi Mio
    2005 Volume 42 Issue 2 Pages 134-139
    Published: February 10, 2005
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.42.134
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    The relationships between the extraction rate of Y by a mechnochemical treatment and the specific impact energy of balls calculated from computer simulation were studied and the optimum design of planetary ball mill was proposed by DEM. It was found that the extraction rate is proportional to the specific normal impact energy under all of the milling conditions studied, and the linear relation was successfully used for the prediction of extraction rate using a large-scale planetary ball mill. Therefore, the mechanochemical reaction rate can be estimated by the specific normal impact energy of the balls calculated by the computer simulation.
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  • [title in Japanese]
    2005 Volume 42 Issue 2 Pages 146-147
    Published: February 10, 2005
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.42.146
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  • [title in Japanese]
    Takashi Ogi
    2005 Volume 42 Issue 2 Pages 148-149
    Published: February 10, 2005
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.42.148
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