Journal of High Pressure Institute of Japan
Online ISSN : 1347-9598
Print ISSN : 0387-0154
ISSN-L : 0387-0154
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Volume 30, Issue 2
Displaying 1-7 of 7 articles from this issue
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  • Pressure Application Technology for Sintering of Ceramics
    Katsutoshi KOMEYA
    1992 Volume 30 Issue 2 Pages 60-68
    Published: March 25, 1992
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.30.60
    JOURNAL FREE ACCESS
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    The pressure application in the processing is critically available for the fabrication of fine ceramics such as electroceramics, engineering ceramics, optoceramics and bioceramics. In the sintering process of ceramics, especially non-oxide ceramics, hot-pressing, hipping and gas pressure sintering are the most important technologies. This paper describes the outline of application effects of the pressure on sintering of ceramics, in which the above three kinds of methods are mainly introduced. Since hipping and gas pressure sintering are described in other chapters of this Journal, role of hot-pressing on sintering has been explained in details.
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  • Application of HIP Technology to Ceramics
    Takao FUJIKAWA
    1992 Volume 30 Issue 2 Pages 69-77
    Published: March 25, 1992
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.30.69
    JOURNAL FREE ACCESS
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    Hot Isostatic Pressing (HIP) which has been recognized as an ideal process to achieve the full densification of ceramics in the 1980's is reviewed and its prospects in the 1990's are discussed from the view point of the specific application techniques. The features of this process, namely, simultaneous application of pressure and temperature enable the high pressure sintering of ceramics, the full densification of preliminary sintered ceramics and the diffusion bonding of ceramics. Alumina, Mn-Zn-ferrite, partially stabilized zirconia and silicon nitride are well known materials to which HIP has been applied and nowadays successfully manufactured on a commercial scale.
    Some of the points which have to be considered carefully in the processing of these ceramics are outlined. The atmosphere control in the HIP treatment and the metal foil encapsulation technique are explained as the examples of the promising methods which will become popular in the 1990's.
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  • Gas-Pressure Sintering of Ceramics
    Mamoru MITOMO
    1992 Volume 30 Issue 2 Pages 78-83
    Published: March 25, 1992
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.30.78
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    Gas-pressure sintering has been developed for the fabrication of high-density silicon nitride ceramics.
    One of the effects of high gas pressure is to stabilize materials at high temperatures thermodynamically and to prevent the evaporation of gaseous products from the compacts during sintering. The reason for the requirement of high nitrogen pressure in the sintering of silicon nitride based ceramics is given.
    Anoter effect is to accelerate the densification rate by appling higher gas pressure than that of the equilibrium for closed pores. The advantage of two-step sintering for the optimization of sintering conditions is revealed.
    The application of gas-pressure sintering for the fabrication of oxide ceramics is also shown.
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  • Preparation and Application of Densified Glass
    Hiroshi YAMASHITA, Naoyuki KITAMURA, Makoto KINOSHITA
    1992 Volume 30 Issue 2 Pages 84-92
    Published: March 25, 1992
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.30.84
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    Densification of glass under high pressure and high temperature is shortly reviewed from the points of view of glass structure and densification mechanism. Some of characteristic properties of the densified state are promissing for use in the fields of optics and ultra-sonic waves.
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  • Alteration of Grain-boundary Composition and Color of Silicon Nitride by Capsule-free HIP
    Yasuhiro GOTO, Akihiko TSUGE, Katsutoshi KOMEYA
    1992 Volume 30 Issue 2 Pages 93-97
    Published: March 25, 1992
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.30.93
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    The relation between a change in grain-boundary composition and a change in color for silicon nitride (Si3N4) ceramics, during capsule-free hot isostatic pressing (HIP), were investigated by EPMA color mapping and microanalysis using transmission electron microscopy (TEM) with energy dispersive X-ray spectroscopy (EDS). It was concluded that the color change in the sintered body of Si3N4, during HIP using AlN powder bed, was not attributed to the change in the density or the crystalline phase, but to the change in a composition of Si, Al, and Y in the glassy grain- boundary phase. In the case of HIP in a Si3N4 crucible without any powder bed, the color change was very small.
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  • Thermoelastic Stress Analysis with SPATE 8000
    G. Slater, Hajime INOUE
    1992 Volume 30 Issue 2 Pages 98-105
    Published: March 25, 1992
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.30.98
    JOURNAL FREE ACCESS
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    [in Japanese]
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  • [title in Japanese]
    [in Japanese]
    1992 Volume 30 Issue 2 Pages 106-108
    Published: March 25, 1992
    Released on J-STAGE: August 05, 2010
    DOIhttps://doi.org/10.11181/hpi1972.30.106
    JOURNAL FREE ACCESS
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