巻号一覧
9 巻 (1962)
- 6 号 p. 217-
- 5 号 p. 163-
- 4 号 p. 131-
- 3 号 p. 93-
- 2 号 p. 55-
- 1 号 p. 1-
9 巻, 5 号
選択された号の論文の4件中1～4を表示しています
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八百 輝彦, 姉小路 幸男1962 年 9 巻 5 号 p. 163-168
発行日: 1962/10/25
公開日: 2009/05/22
ジャーナル フリーThe 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.抄録全体を表示PDF形式でダウンロード (1903K) -
Sumio Ichiba1962 年 9 巻 5 号 p. 169-176
発行日: 1962/10/25
公開日: 2009/05/22
ジャーナル フリーIn 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.抄録全体を表示PDF形式でダウンロード (320K) -
W-Ni合金の焼結過程とその性質について竹内 久祐, 宮崎 健, 阿部 勝夫1962 年 9 巻 5 号 p. 177-183
発行日: 1962/10/25
公開日: 2009/05/22
ジャーナル フリーThe 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.抄録全体を表示PDF形式でダウンロード (5653K) -
木村 康之1962 年 9 巻 5 号 p. 184-189
発行日: 1962/10/25
公開日: 2009/05/22
ジャーナル フリーUltrasonic 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.抄録全体を表示PDF形式でダウンロード (379K)
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