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Volume 9 (1962)
- Issue 6 Pages 217-
- Issue 5 Pages 163-
- Issue 4 Pages 131-
- Issue 3 Pages 93-
- Issue 2 Pages 55-
- Issue 1 Pages 1-
Volume 9, Issue 5
Displaying 1-4 of 4 articles from this issue
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Teruhiko Yao, Yukio Anekôji1962 Volume 9 Issue 5 Pages 163-168
Published: October 25, 1962
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSThe influence of particle size distribution, specific surface area, mixing ratio of fine and coarse powder, and compacting pressure on the rate of sintering of tungsten metal powder was studied.
It was found that the rate of sintering δi-δo/δt-δo (δo: green density, δi: sintered density, δt: true density) is proportional to the specific surface area and is effected by particle size distribution of powder having the same average particle size, but not effected by packing density. The effect of compacting pressure upon the rate of sintering was not found and the densification rate decreased with increasing compacting-pressure.View full abstractDownload PDF (1903K) -
Sumio Ichiba1962 Volume 9 Issue 5 Pages 169-176
Published: October 25, 1962
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSIn order to study the solid reaction between zinc oxide and ferric oxide over a wide temperature range the fission gas emanation method was applied. It was found that the reaction occurs in two processes, the first which occurs at temperature below about 900°C is due to the structure sensitive properties of ferric oxide and the second is attributed to the lattice loosening of the zinc oxide. The reaction process could be investigated more sensitively by the fission gas emanation method than by the radon emanation method.View full abstractDownload PDF (320K) -
On the Sintering Process of W-Ni Alloys and their PropertiesHisasuke Takeuchi, Takeshi Miyazaki, Katsuo Abe1962 Volume 9 Issue 5 Pages 177-183
Published: October 25, 1962
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSThe physical and mechanical properties of W-Ni alloys of 0.1-2.0% Ni prepared by the nickel activated sintering were studied to obtain an alloy having electrical conductivity and thermal expansion coefficient nearly close to that of pure tungsten. Several interesting results were obtained as follows.
(1) The sintering of these alloys appreciably proceeds at temperature ranging from 1000°C to 1300°C.
The density of alloys sintered at 1200°C is 18.5 to 18.8g/cm3 (density ratio 97% up).
(2) Value of electrical conductivity of an alloy sintered at about 1200°C (about IACS 28%) is maximum and it decreases as sintering temperature increases.
(3) The W-Ni alloy containing 2% Ni sintered at 1000°C has the higher hardness (Hv 550) than the swaged tungsten.
These results were obtained by the measurements of magnetic properties and microhard-ness, and the X-ray diffraction method.View full abstractDownload PDF (5653K) -
Yasuyuki Kimura1962 Volume 9 Issue 5 Pages 184-189
Published: October 25, 1962
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSUltrasonic wave propagation velocity in ferrite which had been hardly researched was measured. With 5MC ultrasonic wave, velocities of longitudinal and transvers waves were measured by the rotating method in which the angle of total reflection of incident beam upon the sample was measured. From experimental values the elastic constant of ferrite was calculated.
The results are summarized as follow:
(1) Elastic constant of ferrites increases with increasing fired temperature. This consists with its shrinkage in firing at higher temperature than 1100°C.
(2) The elastic constant of Ni-Zn ferrite increases steeply between 1100°C and 1200°C in firing. This trend corresponds to that of firing temperature vs. apparent density data and firing temperature vs. micro Vickers hardness data.
(3) The elastic constant of ferrite does not change remarkably above and below the Curie temperature.
(4) Changing the condition of producing ferrite, the elastic constants of ferrites varies by 10-20%.
(5) It seems that additions for improving magnetic characters of ferrite bring the increase of the elastic constant by 10%.
(6) Through the ferrites fired at high temperature runs the sound wave with its velocity more than 7000m/sec generally.View full abstractDownload PDF (379K)
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