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Volume 5 (1958)
- Issue 3 Pages 147-
- Issue 2 Pages 80-
- Issue 1 Pages 1-
Volume 5, Issue 1
Displaying 1-6 of 6 articles from this issue
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[in Japanese]1958 Volume 5 Issue 1 Pages 1
Published: August 20, 1958
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSDownload PDF (77K) -
(Studies on Pressing of TiC-Co System Cermet, No.1)C. Kawashima, S. Saito, M. Kato1958 Volume 5 Issue 1 Pages 18-25
Published: August 20, 1958
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSHydrostatic pressing method is radically different from ordinary mechanical ones, having high pressure resisting chamber in which green compact setin rubber die or rubber envelope can be pressed by Pascalian hydraulic force. This report is related to study green strength of TiC-Co system cermet powder compacted by hydrostatic pressing device, specially constructed to be able to endure until under hydraulic pressure of 10, 000kg/cm2, and here concerns especially with transverse strength of green compact, previously pressed slightly in metal or plastic die and finally compacted strongly in rubber envelope.
As a factorial design, L81 340 type orthogonal design was used, adopting 5 factors as following…… A: Co powder content (0, 20, 40%), B: paraffin percentage (1, 2, 3%), C: time effect between the intervals of addition of paraffin and preliminary pressing (2, 24, 48hr.), D : preliminary pressing force (100, 200, 300kg/cm2) and F: hydrostatic pressing pressure (1, 2, 3ton/cm2). In addition, as auxiliary experiments, two designs of more increased levels among A, B and F were tested to get more precise imformation. Transverse strength as characteristic value was measured by the specially ordered testing apparatus having very high sensive mechanism to small amount of load and reveals that the main effects of A, B, C and F are significant, and interactions AXB, AXF are also significant. Each linear and cubic effect of A, B and F are significant, while each quadric effect is non-significant except A.View full abstractDownload PDF (3450K) -
E. Hayashi, K. Watanabe, K. Fujii1958 Volume 5 Issue 1 Pages 26-36
Published: August 20, 1958
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSUsing electrolytic and reduced iron powders which have been generally used in the powder metallurgy industry in Japan, studies were carried out on physical or mechanical properties of green and sintered compacts which were made by single pressing or repressing methods under the various conditions of pressing and sintering. Special attention was given to be sure that the samples had almost the same particle distribution.
Microscopic examination of structures of sintered compacts were also performed and found that extremely small pores included in sintered compacts of reduced powders, made by a single pressing method, decreased remarkably in number through the use of a reprssing operation.
Further experiments were made on carburization of sintered iron in a gas atmosphere which was produced by converting a town gas through charcoals. One of the findings was that depth of the carburized case of the sintered iron was influenced by the compacting pressure, carburizing temperature and time, and the most effective factor of the three was the compacting pressure.View full abstractDownload PDF (5680K) -
Kachi Sukeji1958 Volume 5 Issue 1 Pages 37-40
Published: August 20, 1958
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSParticles size and other chemical properties of thorium and its oxide were investigated. Metallic thorium powders were prepared by the electrolysis of KTHF5 dissolved in 50% NaCl-KCl mixture. The crystal size of the powders decreased with the increasing current density. And the maximum distribution was found in the region of 40μ100μ in the distribution curve.
Various properties of the powders are summarized as follows ;
(1) Each particle is a single crystal and its growth direction is[111]of the face centred cubic.
(2) The powders have a high plasticity and good compressibility (better than copper).
(3) Briquett pressed under the press. of 3t/cm2 were easily sintered at 1200°during 2hr.
(4) As the method of production of the powders, the hydride process is considered to be most profitable, because decontamination of the salt from the minor crystal is rather difficult.
To study the various properties of thorium oxide, temperature dependency of emanation values were measured in the process of the calcination of the oxalate and other compounds.
Dehydration process and the particle size distribution were clearly seen from these experiments. It is also concluded that the Hahn's emanation method is a good experimental tool for the studies of powder metallurgy, ceramics and surface phenomenae of other substances.View full abstractDownload PDF (4451K) -
[in Japanese]1958 Volume 5 Issue 1 Pages 41-45
Published: August 20, 1958
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSDownload PDF (356K) -
[in Japanese]1958 Volume 5 Issue 1 Pages 46-51
Published: August 20, 1958
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSDownload PDF (422K)
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