巻号一覧
7 巻 (1960)
- 6 号 p. 255-
- 5 号 p. 197-
- 4 号 p. 149-
- 3 号 p. 99-
- 2 号 p. 35-
- 1 号 p. 1-
7 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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岩本 多実1960 年 7 巻 5 号 p. 197-200
発行日: 1960/10/25
公開日: 2009/12/04
ジャーナル フリーFor the analysis of particle size distribution of UO2, ZrOa and other substances, a y-ray counting method was applied to estimate the accumulative percentage of the particles at the bottom of sedimentation column. The sample materials were irradiated in J.R.R.-1 reactor and labelled with the radioactive isotopes formed by (n γ) reaction. The particle size distributions of UO2 and ZrO2 in the range of 0.05μ to 60μ were determined. The principles and the advantageous points of this method and the applications are also described.抄録全体を表示PDF形式でダウンロード (226K) -
山森 末男, 森田 義男, 岩村 武志, 政木 淑人1960 年 7 巻 5 号 p. 201-210
発行日: 1960/10/25
公開日: 2009/05/22
ジャーナル フリーThe erosion manner of Ag, Ag-W (6500) and Ag-CdO (100') contacts under large current (D. C.) was examined mainly from the view point of the micro-structural changes of their contact surface layers. In the first place the result of a single making operation of large current on each virgin contact surface shows more spreaded arc-foot and shallower erosion-depth in the case of Ag-matrix containing W or CdO than in the case of pure Ag-contact. Then as to the structural changes due to the repeated operations, it is found that in the case of Ag-W contact the composition of the surface layer is converted into the mixture of W and W-oxide by the dissipation of Ag, while in the case of Ag-CdO contact into Ag-rich by the dissipation of CdO.
In view of the fact that the micro-structure has an important function in contact operation, the Ag-CdO contacts of uniform composition (10% CdO) but of different micro-structures were compared. From these experiments it is found that properly minute distribution of CdO tends to leave the contact at but slight rate of erosion, but expra-ordinarily minute distribution increases the dissipation amount of CdO.
The operating condition in this experiment included in addition to the normal swi-tching on-off test, other loading systems such as exclusively to make and exclusively to break the circuit.抄録全体を表示PDF形式でダウンロード (7231K) -
藤井 康次1960 年 7 巻 5 号 p. 211-226
発行日: 1960/10/25
公開日: 2009/05/22
ジャーナル フリーCopper powders with or without nickel powders were mechanicaly mixed with various kinds of oxides, carbides or tungsten powders, followed by compacting, sintering and hot working processes. The oxides and tungsten particles agglomerated during the sintering process, while the carbides particles did not, This agglomeration was thought to be due to the growth of metal particles and the interfacial energy between the dispersed particles and the metal matrix.
The measurement of the room temperature strength of the hot rolled composite alloys showed that the strength of the alloys with the dispersed phases adhering strongly to the matrix increased considerably with an increase in the amount of the dispersed phases and exceeded that of the alloys with the dispersed phases adhering weakly to the matrix. The strength of the alloys with the dispersed phases adhering weakly to the matrix increased slightly with the amount of the dispersed phases. The titanium carbide adheres weakly to the copper and strongly to the Cu-Ni alloy. Therefore, the titanium carbide was recongnized as an effective additional for the strength of the Cu-Ni alloy but not so for pure copper.
High temperature strength tests were carried out up to 600°C. The strength of the composite alloy at a high temperature also increased by the dispersed phase adhering strongly to the matrix, but even the strength of the alloy with the most effective additional decreased with the rise of the temperature.抄録全体を表示PDF形式でダウンロード (17089K) -
Yasumasa Goto, Toshio Kitamura, Toshio Takada, Sukeji Kachi1960 年 7 巻 5 号 p. 227-231
発行日: 1960/10/25
公開日: 2009/05/22
ジャーナル フリーThe phase diagram of the system La2O3-Fe2O3 was determined by X-ray diffraction, melting point measurements and microscopic observations. Since the dissociation of Fe2O3 into Fe2O4+1/2O2 was observed above 1400°Cin air, specimen materials were treated at 1 atmospheric pressure of oxygen in the case of heating above 1400°C.
The dissociation pressure of Fe2O3 attains to 1 atm. at 1490°C, so even the use of 1 atmospheric pressure of oxygen is insufficient to prevent the thermal reduction of Fe2O3 above this temperature, especially in the case of heating the specimens to melting points. But the measurements were carried out with the expectation that the melting points would not differ seriously even if the oxygen defects are introduced by the dissociation.
LaFeO3 is the only intermediate compound found in this system, which melt incongruently at 1850°C. The eutectic reaction, LaFeO3+Fe2O3 ?? liquid, was also observed at 1490°C, 83.3 mol% Fe2O3. The mutual solid solubilities between compounds in this system (i.e. La2O3, LaFeO3 and Fe2O3) were not observed.
Ferromagnetic compound, which is producible by heating at 1400°-1420°C in air accom-panied with the dissociation of a part of Fe2O3, is not confirmed in our present experiments performed at 1 atmospheric pressure of oxygen.抄録全体を表示PDF形式でダウンロード (2779K)
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