巻号一覧
11 巻 (1964)
- 6 号 p. 281-
- 5 号 p. 223-
- 4 号 p. 175-
- 3 号 p. 125-
- 2 号 p. 57-
- 1 号 p. 3-
11 巻, 3 号
選択された号の論文の3件中1～3を表示しています
- |<
- <
- 1
- >
- >|
-
西島 寅次1964 年 11 巻 3 号 p. 125-134
発行日: 1964/06/25
公開日: 2009/05/22
ジャーナル フリーIn TOSHIBA, Uranium oxide has been handled as reactor fuel since 1958. This paper mainly deals with the fabrication process of the pellets and the yield for the applied specifications. The characteristics of the TOSHIBA PROCESS are as follows;
1. The rolling process is employed for a physical treatment of powder.
By this treatment, coagulated porous particles are divided into elementary fine particles while they are partially densified into dense particles, and then become suitable for pressing once organic additives being added. This treatment is rather effective and healthy than ball milling or others.
2. A mixed organic additives with organic solution is applied.
The additives was chosen from the following stand points:
(i) Highly lubricative ability among particles or between powder and die. (ii) Easy dewaxing property (iii) Precise evaluation of the change of the weight between before and after dewaxing in powder state.
3. The feeding mechanisms of powder from a hopper to a feeding shoe and from the shoe to the die holes were improved in the automatic pressing.
This method may control the precision of the green density within ±1.27% of the theoretical value even when a lot of pellets are treated.
4. The size with high precision may be obtained after sintering as the result mentioned above.
5. Unrecoverable loss is small even after the size of the pellet is ground so that the tolerance in diameter becomes ±0.02mm.
When the specification of the pellets was assumed to be φ=9.90±0.02mm h=15.00±0.15 and p=94.5±1% T. D., the yield was 91.10% and unrecoverable loss was 1.16%. When the specification was allowed to be φ=10.00±0.15 h=15.00±0.2 and p=94.5±2% T. D., the yield was raised to 97.15% and unrecoverable loss was decreased to 0.42%.抄録全体を表示PDF形式でダウンロード (4997K) -
渡辺 孝章, 山本 一雄, 川戸 克1964 年 11 巻 3 号 p. 135-147
発行日: 1964/06/25
公開日: 2009/05/22
ジャーナル フリーHighly dense spherical particles of oxides, carbides and metals with high melting point above 2, 000°C were . obtained by means of plasma fusion technique.
Each fine raw powder was kneaded and extruded into thin rods. Extruded rods were then sintered to over 70% theoretical density in a suitable atmosphere. Sintered rods were fused and atomized in direct current argon plasma flame. Being collected in a water-jacket cooled chamber filled with argon, these fused particles were separated from small fractions of irregular particles.
Major part of these studies consisted of the experiments related to the effects of such variables as feeding method of sintered rod, collecting method of fused particles and operating conditions of plasma-jet generator on the particle size distribution, the density and the yeild of the spherical particles.
As the results of these studies, the technique has been developed, in which nearly spherical, highly dense and pure particles (0.1-2mm in diameter, above 95% theoretical density) could be fabricated continuously from fine raw powder of a few microns. Besides, from X-ray diffraction analyses and metallographic observation, it was known that the particles had supercooled structures and that they could be normarized to structures similar to sintered bodies by annealing at adequate temperature.抄録全体を表示PDF形式でダウンロード (10300K) -
渡辺 〓尚1964 年 11 巻 3 号 p. 148-156
発行日: 1964/06/25
公開日: 2009/05/22
ジャーナル フリーThis report mainly discusses on characteristics of the iron-copper bearings by studying on several following problems; a) Effects of velocity and pressure of friction on the bearing performance. b) Effects of copper-content of the compacts on the bearing performance. c) A comparison on the bearing performance between the iron-copper bearings and a sintered porous bronze bearing.
The results obtained are as follows ; 1) It should be of advantages to use the iron-copper bearings for more heavy duty applications, because the matrix-metal of these bearings has a high toughness considerably against metal-flow on the shaft-sliding surface of bearing. 2) As compared with maximum permissible PV value between the iron-copper bearings and the bronze bearing, the formers are about 1.6-2.0 times higher than the latter having about 1000 kg/cm2. m/min. 3) And the best results are obtained when the iron-copper bearing has a copper-content of about 25wt%o.抄録全体を表示PDF形式でダウンロード (8484K)
- |<
- <
- 1
- >
- >|