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 26, Issue 3
Displaying 1-16 of 16 articles from this issue
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  • [title in Japanese]
    Yasuo KOUSAKA
    1989 Volume 26 Issue 3 Pages 145
    Published: March 10, 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.26.145
    JOURNAL FREE ACCESS
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  • Preparation of Fine Particles of Superconducting Oxides by Aerosol Reactor
    Kikuo OKUYAMA, Motoaki ADACHI, Kouji ARAI, Yasuo KOUSAKA, Noboru TOHGE ...
    1989 Volume 26 Issue 3 Pages 146-150
    Published: March 10, 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.26.146
    JOURNAL FREE ACCESS
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    A new process for preparing particles of superconducting oxides is developed by using the aerosol flow reactor in which aqueous solutions of corresponding metal nitrates or acetates are atomized and their droplets are evaporated and thermally decomposed. For Y-Ba-Cu-O system, the particles having orthorhombic YBa2 Cu3 O7-x phase can be formed directly at the decomposition temperatures from 900°C to 1000°C. The particles obtained are spherical and their size can be changed by changing the concentration of the aqueous solutions. The bodies sintered from these particles show the off-set temperature of superconducting transition at 84K. For the Bi-Ca-Sr-Cu-O system, the produced particles of the BiC-a SrCu2Ox composition differ from either 80K or 110K phase, whereas the sintered bodies show the X-ray diffraction of the 80K phase with the on-set temperatures of superconducting transition at 87K and 110K.
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  • The In-situ Measurments of Ultra-Fine Oxide Particles Formed in a Flame
    Korekazu UEYAMA, Keizo TANAKA, Hideyo KAWAZOE, Akira IINO, Yoshikazu M ...
    1989 Volume 26 Issue 3 Pages 151-156
    Published: March 10, 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.26.151
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    Sicl4 and/or GeCl4 were oxidized in an oxygen-hydrogen flame, and in-situ measurements of oxide particles in the flame were performed by using an Ar+ ion laser. The following results were obtained: 1) When only SiCl4 was fed into the system, silica particles were formed just above the top of a burner, and the particles were ascending keeping the mean particle size almost constant at 50-60nm in a narrow path without spreading laterally. 2) When only GeCl4 was fed, germania particles formed just above the burner top were vaporized due to the increase in flame temperature, diffused laterally as gaseous molecules, and condensed again to particles as the flame temperature decreased. 3) In the system when both SiCl4 and GeCl4 were simultaneously fed into the flame, the vaporization of Ge decreased considerably.
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  • Submicron Ceramic Powder Synthesis by a Fluidized Bed of Microcontainer Particles
    Mayumi TSUKADA, Jun NAITO, Takako MASUDA, Masayuki HORIO
    1989 Volume 26 Issue 3 Pages 157-162
    Published: March 10, 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.26.157
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    The concept of a fluidized bed of microcontainer particles is proposed. Although conventional fluidized beds are not good at handling cohesive submicron particles, the use of microcontainer particles enables us to produce and process them in fluidized beds. To examine the proposed concept, the syntheses of nitrogen ceramic powders (Si3N4, TiN and AlN) through carbothermal reduction and nitridation were performed in a thin fixed bed and a fluidized bed at 1300-1550°C. In every case, submicron powders were successfully obtained. For Si3N4 synthesis, the SiO(g) loss from the fixed bed and the degrees of silica reduction and nitridation were determined as functions of time and temperature. Though the deposition of SiO vapor increased the stickiness of the bed, the bed was fluidized with no problems when the gas flow rate was sufficiently high for bubbling. The SiO vapor deposition in the freeboard was found to be controllable by adjusting particle size and the gas flow rate.
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  • Electrostatic Separation of CVD Ultrafine Particles at High Temperature
    Hideo YAMAMOTO
    1989 Volume 26 Issue 3 Pages 163-168
    Published: March 10, 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.26.163
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    The feasibility of electrostatic precipitation at high temperature was demonstrated for the separation of the ultra-fine particles synthesized by thermally activated CVD ( Chemical Vapor deposition) from the reaction gas stream. Silicon nitride particles were prepared from a SiCl4/NH3 system at 1200°C. This process produces the NH4Cl by-product which is a solid particle at normal temperature. Using the high temperature electrostatic precipitation method, it is expected that the Si3N4 product can be collected without the by-product (NH4Cl) from reaction gas because the sublimation temperature of NH4Cl is about 340°C. The new electrode system for corona discharge was developed because stable corona discharge was not obtained in the reaction gas atmosphere at high temperatures. The X-ray diffraction shows that the particles collected on the electrode at 500°C contains no NH4Cl particle.
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  • Electrostatic Formation of a Ceramic Membrane with Fine Pores
    Hideo YAMAMOTO, Tsuyoshi NOMURA, Sen-ichi MASUDA
    1989 Volume 26 Issue 3 Pages 169-173
    Published: March 10, 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.26.169
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    A new method for forming a cermamic membrane was devised. Ultrafine particles synthesized by thermally activated CVD (Chemical Vapor Deposition) were deposited on the surface of a porous ceramic supporter by electrostatic force and sintered in an inert gas atmosphere. The ceramic membrane made by this method is available for ultrafiltration because it has very fine pores of about 0.04 micro-meter in diameter but a large porosity.
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  • Synthesis of Composite Fine Particles in the Gas Phase
    Shigehisa ENDOH, Kazuhisa OKUDA, Jiro KOGA, Shiro MATSUMOTO, Kazuo TAK ...
    1989 Volume 26 Issue 3 Pages 174-178
    Published: March 10, 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.26.174
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    The objecting was to synthesize fine particles composed with ultra-fine particles by coagulation in the gas phase. The ultra-fine particles of TiO2 were genarated by the thermal decomposition of titanium tetraisopropoxide vapor. At the temperature of decomposition above 600°C, the TiO2 particles were anatase, and the size of those were less than 100nm. The ultra-fine particles were mixed and composed of Polystyrene latex particles having a diameter of 1000nm dried after atomization. The polystyrene latex particles were coated by the aggregate of ultra-fine particles. The process of the composition was discussed by using an electrostatic coagulation model.
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  • Fine Particles Prepared by Radio-frequency Thermal Plasma System and Handling
    Akihiro GOTOH, Humikazu IKASAKI, Mitsutaka KAWAMURA, Kenji SAKANAKA, T ...
    1989 Volume 26 Issue 3 Pages 179-182
    Published: March 10, 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.26.179
    JOURNAL FREE ACCESS
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  • Preparation of Monodispersed Fine Particles by Hydrolysis of Metal Alkoxides
    Nobuyasu MIZUTANI
    1989 Volume 26 Issue 3 Pages 183-188
    Published: March 10, 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.26.183
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  • Formation of Fine-Grained Crystalline Particles in Amorphous Phase
    Tadashi KOKUBO
    1989 Volume 26 Issue 3 Pages 189-194
    Published: March 10, 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.26.189
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  • Models for Gas Phase Nucleation
    Kikuo OKUYAMA
    1989 Volume 26 Issue 3 Pages 195-202
    Published: March 10, 1989
    Released on J-STAGE: July 01, 2010
    DOIhttps://doi.org/10.4164/sptj.26.195
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1989 Volume 26 Issue 3 Pages 203-204
    Published: March 10, 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.26.203
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1989 Volume 26 Issue 3 Pages 204
    Published: March 10, 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.26.204
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
    1989 Volume 26 Issue 3 Pages 205
    Published: March 10, 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.26.205
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1989 Volume 26 Issue 3 Pages 206-207
    Published: March 10, 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.26.206
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1989 Volume 26 Issue 3 Pages 208-215
    Published: March 10, 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.26.208
    JOURNAL FREE ACCESS
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