巻号一覧
8 巻 (1961)
- 6 号 p. 247-
- 5 号 p. 183-
- 4 号 p. 137-
- 3 号 p. 101-
- 2 号 p. 43-
- 1 号 p. 1-
8 巻, 5 号
選択された号の論文の3件中1～3を表示しています
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深津 保1961 年 8 巻 5 号 p. 183-194
発行日: 1961/10/25
公開日: 2009/05/22
ジャーナル フリーIn order to clarify the sturctures and the properties of binder phase in cemented tungsten carbide alloy with cobalt, physical properties such as lattice constant, Curie temperature and magnetization of γ-Co solid solution containing up to 15% WC by weight have been studied. Based on these results, the change of the binder phase in WC-5.5% Co composition during the sintering has been first observed. Then, the effect of the various cooling rate from melt on the kinds of alloy phases, and also the structue of γ-Co phase of the Co rich-WC alloys have been investigatd by the method of microscope, X-ray diffraction and thermomagnetic techniques. The results obtained were as follows. By slow cooling, ry or (γ+WC) phases, and by rapid cooling (γ+η) phases appeared on the samples of 5-35% WC-Co alloys. But (γ+η) phases were unstable, and so by annealing, (γ+η) phase changed to stable (γ+WC) phase. These results mentioned above could be described consistently by the double phase diagram containg unstable η phase shown in Fig.8. The process of decomposition of η phase and the simultaneous change of γ phase were also invetigated.抄録全体を表示PDF形式でダウンロード (7671K) -
明石 雅夫1961 年 8 巻 5 号 p. 195-209
発行日: 1961/10/25
公開日: 2009/05/22
ジャーナル フリーAs described in Part I, the resistivity of ferrites is greatly increased by simultaneous addition of CaO and SiO2. In order to clarify the effect of impurities, various investigations have been carried out. The high resistivity thus obtained decreases with frequency. This suggests that the ferrites have an inhomogeneous dielectric structure consisting of poor-conducting layers separating relatively goodconducting grains. It was confirmed by autoradiograph and other techniques that the impurities were almost localized near the grain boundaries to form poor-conducting layers. The substance of grain boundary is considered as mixed oxide of the ferrite and the impurities, represented by (Ca1-xSixOγ)i-y(Ferrite)y. In fact, it was found that at certain composition of this series, the resistivity was extremely high and varied with firing conditions in the same mann eras the ferrite containing the impurities. It was concluded that the grain-boundary had profound effect on the resistivity of ferrite.抄録全体を表示PDF形式でダウンロード (2041K) -
林 悦雄1961 年 8 巻 5 号 p. 210-219
発行日: 1961/10/25
公開日: 2009/05/22
ジャーナル フリーPDF形式でダウンロード (2646K)
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