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Volume 13 (1966)
- Issue 6 Pages 263-
- Issue 5 Pages 209-
- Issue 4 Pages 157-
- Issue 3 Pages 107-
- Issue 2 Pages 47-
- Issue 1 Pages 1-
Volume 13, Issue 4
Displaying 1-5 of 5 articles from this issue
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[in Japanese]1966 Volume 13 Issue 4 Pages 157-165
Published: August 25, 1966
Released on J-STAGE: May 22, 2009
JOURNAL FREE ACCESSDownload PDF (652K) -
[in Japanese]1966 Volume 13 Issue 4 Pages 166-180
Published: August 25, 1966
Released on J-STAGE: May 22, 2009
JOURNAL FREE ACCESSDownload PDF (797K) -
Keiichiro Shoji, Shintaro Yamada1966 Volume 13 Issue 4 Pages 181-185
Published: August 25, 1966
Released on J-STAGE: December 04, 2009
JOURNAL FREE ACCESSSintered iron-3%nickel specimens prepared from the mixture of reduced iron and carbonyl nickel powders were gas carburized and oil-quenched. The effects of nickel addition were examined. The results obtained are as follows :
1) The increase in sintered density by nickel addition was found to be effective in reducing the penetration of carburizing gas to the interior of the sintered specimens. The carbon decrease in the carburized specimens is remarkable owing to the high density of the specimen obtained by the prolonged sintering.
2) The surface carbon content of carburized specimens tends to decrease as compared with sintered and carburized iron specimens owing to the density increase and the change of the carbon activity in austenite by the nickel addition.
3) The increase in quench-hardening ability by the nickel addition depends on the diffusion of nickel into iron during the sintering. The depth of the hardened case increases in the early stage, and then decreases, with increasing sintering time. This decrease of depth is due to the above mentioned carbon decrease during the prolonged sintering.View full abstractDownload PDF (2763K) -
Shinroku Saito, Shigeyuki Somiya, Koichi Kato1966 Volume 13 Issue 4 Pages 186-191
Published: August 25, 1966
Released on J-STAGE: December 04, 2009
JOURNAL FREE ACCESSEffects of the additives on sintering of Si 3N4 have been studied. As the additives, Al(OH) 3, Al powder, A1PO4, AIN, SiC, Si powder, SiO2, MgO, TiO2, BN, Fe2O3, etc. were used. The powder of Si 3N 4 was mixed with 1, 3 or 5 wt. % of the additive, and then was pressed isostatically at 1000 kg/cm2. Sintering was done in the N 2 atmosphere at 1530°C for 4 hours. The most effective additive was MgO at 5 wt. %, followed by MgO at 3 wt. %, and the third was Al(OH) 3 at 5 wt. %. Moduli of rupture of these bodies were 830 kg/cm2, 664 kg/cm2, and 414 kg/cm2 respectively.View full abstractDownload PDF (324K) -
Soichiro Nobuoka, Kazuaki Ado, Tokuo Ando1966 Volume 13 Issue 4 Pages 192-196
Published: August 25, 1966
Released on J-STAGE: May 22, 2009
JOURNAL FREE ACCESSSome magnetic properties of γ-Fe2O3 powders for magnetic recording have been measured as a function of packing density.
The samples were prepared by the methods in the previous reports, all having different particle size and shape. Histeresis loop, coercive force BHC and induction Bm were measured on these samples by a ballistic method at the coefficient of packing density over the range from 10% to 60%.
The results were as follows : (1) The coercive forceBHC was strongly influenced by the average length to diameter ratio of the particle. (2) The BHC values of single domain particles decreased with increasing packing density and the changes were almost linear. The slope of BHC packing density curves increased with increasing axial ratio. The decrease. of BHC with the compression was supposed to be affected by the interaction among nearby particles and by the crushing of the particles. (3) The induction Bm increased with increasing packing density, and the these relations being almost linear.View full abstractDownload PDF (1558K)
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