Journal of the Society of Materials Engineering for Resources of Japan
Online ISSN : 1884-6610
Print ISSN : 0919-9853
ISSN-L : 0919-9853
Volume 7, Issue 2
Displaying 1-9 of 9 articles from this issue
  • A. AZIS
    1994 Volume 7 Issue 2 Pages 5-16
    Published: December 30, 1994
    Released on J-STAGE: October 28, 2010
    JOURNAL FREE ACCESS
    Change in ZSM-5 molecule structure state that has resulted from a thermalprocess at a temperature between 100°C and 900°C by the mechanism as proposedin the model. This mechanism is due to the transfer of bonding energyfrom β1 to β2 as shown on the model structure.
    This transfer of bonding energy influences the energy gap Φ and thereafter, on the polarization caused by the electric field E, this energy gap is consideredto be a factor which limits the dielectric susceptibility η of each ZSM-5 molecule structure state.
    The dielectric susceptibility value was identified by the relative dielectricconstant εr on measurement of its capacitance. The comparison betweenexperiment and calculation has shown that the relative dielectric constantinfluenced by temperature has the same curve.
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  • Shigekazu SUMITA
    1994 Volume 7 Issue 2 Pages 17-26
    Published: December 30, 1994
    Released on J-STAGE: October 28, 2010
    JOURNAL FREE ACCESS
    Thin film of YBa2Cu3O7-x, (YBCO) superconducting material was synthesizedonto MgO (100) substrate. Transmission electron microscopy combinedwith electron diffraction was used for observing morphology of YBCO and forinvestigating reciprocal lattice. The crystal structure was identified orthorhombicwith lattice constants of ao=3.88Å, bo=3.83Å, and co=11.79Å, supported by X-ray diffraction. The YBCO was unstable against strongelectron beam during TEM observation under low oxygen partial pressure (Po2) of 10-7 to 10-6 Torr.
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  • Shigeo SUGAWARA, Jirô WATANABÉ
    1994 Volume 7 Issue 2 Pages 27-34
    Published: December 30, 1994
    Released on J-STAGE: October 28, 2010
    JOURNAL FREE ACCESS
    The (111) thin films prepared from a bulk crystal of Al (99.99% in purity) were heated isothermally at 873K and cyclically between 873 and 773K with aperiod of 0.90 and 1.80ks in a transmission electron microscope, and the behaviorof dislocations was observed directly. During raising of the specimentemperature many dislocations were annihilated from the films except for thosewhich composed three types of sub-boundaries: that is, a dislocation array, alineage defect and a dislocation bundle. No change was observed in the configurationof those sub-boundaries under the iso-thermal heating. Under the thermalcyclic heating, on the contrary, some dislocations composing the dislocationarray slipped away, as foreign dislocations came near and reacted with the dislocationarray. However, morphology of the lineage defect and the dislocationbundle showed little change even under the thermal cyclic heating.
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  • Masaru OTANI, Tomoyuki UCHIYAMA, Hironori MINOSHIMA, Kunio SHINOHARA, ...
    1994 Volume 7 Issue 2 Pages 35-45
    Published: December 30, 1994
    Released on J-STAGE: October 28, 2010
    JOURNAL FREE ACCESS
    Preparation of powders of different particle shape was examined by dryimpact blending method.
    As a result, toner plastic powder and copper metal powder could be processedto spherical particles by several steps. But it was somewhat difficult toproduce those of inorganic calcium carbonate powder without the fine-particlegeneration.
    According to experimental data with copper powder of ductility, the particlesget more spherical with longer treatment time, higher peripheral speed ofa rotor and more sample charge by Hybridizer. There are some points to beimproved in relation to evaluation of particle shape by axes ratio of anequivalent ellipse of same periphery and projected area.
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  • Midori UEDA, Shiro SHIMADA, Michio INAGAKI
    1994 Volume 7 Issue 2 Pages 46-51
    Published: December 30, 1994
    Released on J-STAGE: October 28, 2010
    JOURNAL FREE ACCESS
    Spinel type ferrites of ZnFe2O4 and NiFe2O4, and also α-Fe2O3 with balloonshape were prepared by coating the ethylene glycol (EG) solution of correspondingmetal chlorides onto carbon balloons with size of 53-75μm and heating upto 950°C in the flow of oxygen. The ZnFe2O4 balloons prepared by a solid-statereaction between the balloons of α-Fe2O3 and ZnO had a characteristic wavylinesurface texture, though those prepared directly from the mixed EG solutionof ZnCl2 and FeCl3 had smooth surfaces. The NiFe2O4 balloons were preparedfrom the mixed solution of NiCl2 and FeCl3.
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  • Takehiko ABE, Matsumi WATANABE, Hiroki TAKAHASHI, Kohji TAKAHASHI
    1994 Volume 7 Issue 2 Pages 52-56
    Published: December 30, 1994
    Released on J-STAGE: October 28, 2010
    JOURNAL FREE ACCESS
    The internal temperature profile of the dielectric materials BaO-TiO2-Nd2O3 system for the ceramics calcination process has been measured using a thermocouple.The profile obtained differs from other dielectric materials basedon barium titanate.
    At a low temperature range (-600°C), the rate at which the temperatureof the test dielectric material rises is low. Conversely, at a high temperaturerange (900-1200°C), the rate increases rapidly.
    In order to clarify the mechanism of these phenomena, the reaction processof this system has been tested using TG, DTA, and X-ray diffraction methods.The results show that these phenomena are related to various transformationsof Nd2O3 with endo-or exothermic reactions.
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  • A Study on Vibration Digging
    Yoshihiro SASAKI, Tetsuro KOIKE, Yoshio TAKAHASHI
    1994 Volume 7 Issue 2 Pages 57-64
    Published: December 30, 1994
    Released on J-STAGE: October 28, 2010
    JOURNAL FREE ACCESS
    Recently, the oil hydraulic control system has been widely applied to themining industry, civil engineering and construction industry. Especially, robotizedmachines have been required to improve labor-saving, safety and productionin mining and construction works.
    The aim of this study is to design the oil hydraulic multi-function cylinderwhich corresponds to the robotized machines. The experiment was made withvariations of the supply pressure, the vibration frequency and the bias voltageunder some levels of constant loads. As a result, the quantitative propertiesaffecting the fundamental properties of oil hydraulic multi-function cylinder, namely, the vibration amplitude, feed speed, the maximum pushing force andthe acceleration were made clear.
    This paper is to investigate the digging effect in case that the oil hydraulicmulti-function cylinder is applied to the experimental system assumed as anactual hydraulic excavator, and the quantitative properties of the vibrationcylinder caused by the multi-function cylinder were compared with those of novibrationcylinder.
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  • Naoki HONDA, Saori OKAMOTO, Takashi CHIBA, Kazuhiro OUCHI
    1994 Volume 7 Issue 2 Pages 65-71
    Published: December 30, 1994
    Released on J-STAGE: October 28, 2010
    JOURNAL FREE ACCESS
    Epitaxial growth limits and the preferred orientations of Co-Cr filmssputter-deposited at a high Ar pressure of 70 Pa were investigated. It wasfound that, although the intrinsic growth of the film has a preferred orientationof (11·0) parallel to the film plane for the present deposition condition, the initial growing layer could have a strong preferred orientation of (00·1) plane due to the hetero-epitaxial growth on the Ti underlayer. The effect ofthe epitaxial growth holds to the thickness of only about 200nm, then replacedby the (11·0) orientation via an intermediate layer with co-growing of both (10·0) and (11·0) planes. The thickness of the initial growing layer with (00·1) orientation is sufficient for the application of the Co-Cr film to a perpendicularrecording medium.
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  • Tomoyoshi SHOJI, Tadashi SASAKI, Kazutaka MAKINO
    1994 Volume 7 Issue 2 Pages 72-77
    Published: December 30, 1994
    Released on J-STAGE: October 28, 2010
    JOURNAL FREE ACCESS
    The powder materials are used in various field of industry as raw or intermediatematerials. And many kinds of powder unit operation handle thesepowder materials, but various phenomena of powder have not yet been elucidatedsufficiently.
    In this paper, inhomogeneity forming on shear plane is noticed and discussedfundamentally and thermophysically by using X-ray radio graph system.As the results, it is found that free energy generated by shearing strain changesinto entropy energy which cause the change of bulk density, and this entropyenergy diffuses from shear plane to outer sides into powder layer.
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