巻号一覧
1969 巻 (1969)
- 59 号 p. 272-
- 58 号 p. 224-
- 57 号 p. 186-
- 56 号 p. 149-
1969 巻, 57 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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金山 清次, 奥山 直樹, 竹谷 謙一1969 年 1969 巻 57 号 p. 186-191
発行日: 1969/07/31
公開日: 2010/06/28
ジャーナル フリーThe induction-heated furnace was designed for the preparation of the massive and well-graphitized pyrolytic graphite. The substrate for deposition and the crucible for heat treatment were directly heated by induction heating. In order to attain the required temperature, the frequency of the HF generator was computed to be 250 kHz from the skin depth of the substrate and the crucible and its output power was determined to be 15 kW from the estimation of the thermal losses in the furnace. The pyrolytic graphite deposit of 12 × 170 × 6 mm3 was obtained at the deposition temperature of 2000°C, which was attained with the output power of 9 kW. For heat treatment of the deposit, the output power of 8 kW and 15 kW were needed to maintain the temperature of 3000°C and 3400°C, respectively. The samples after heat treatment exhibit similar physical properties as the single crystal graphite. The details of the structure of the furnace and the practical techniques for deposition and heat treatment are described.抄録全体を表示PDF形式でダウンロード (1121K) -
土肥 禎, 浅野 満, 鈎 三郎1969 年 1969 巻 57 号 p. 192-198
発行日: 1969/07/31
公開日: 2010/06/28
ジャーナル フリーThe inhibiting effects of phosphorus additives on oxidation of pelletized and powdered natural graphite in air were studied. The additives which contained no metal element were found to inhibit oxidation of natural graphite effectively, irrespective of their chemical forms, while the additives which contained metal elements showed a different dependence upon the species of metal element and upon the molar ratio of metal element to phosphorus. It was found that the additions of Li and Na were more effective to inhibit oxidation in air at higher temperature.
The activation energy for oxidation of natural graphite in air was also measured. The measured values were in accordance with the inhibiting actions.
The ignition temperature of natural graphite with additives was described briefly.抄録全体を表示PDF形式でダウンロード (857K) -
高橋 洋一, 佐々 正, 向坊 隆1969 年 1969 巻 57 号 p. 199-203
発行日: 1969/07/31
公開日: 2010/06/28
ジャーナル フリーThe change of layer structure of graphite under bromination was studied by X-ray diffractometry. A specially designed sampleholder system, which enabled to measure the X-ray diffraction pattern of graphite sample on the way of bromination, was utilized for the experiments.
Bromination of graphite was undertaken in the two different ways. They were designated as “rapid”bromination and “step-wise” bromination. In the case of rapid bromination, the graphite sample was brominated rapidly in the atmosphere of saturated vapor pressure of bromine. The X-ray pattern observed showed, at the first stage of the reaction, the coexistence of graphite and 2nd-stage lamellar compound of graphitebromine. No evidence of the formation of higher stage compound was observed.
As for the case of step-wise bromination, the vapor pressure of bromine was increased stepwisely and the bromine absorption of graphite sample proceeded through equilibrium compositions of every step.In this case, the graphite peaks such as (002) and (004) shifted to lower angle and finally came to the position of the 2nd stage lamellar compound. This fact suggests that the higher stage.(such as 4th or 8th stage) lamellar compound would be formed in the course of step-wise bromination.抄録全体を表示PDF形式でダウンロード (625K) -
若槻 雅男1969 年 1969 巻 57 号 p. 204-217
発行日: 1969/07/31
公開日: 2011/03/01
ジャーナル フリーPDF形式でダウンロード (3464K)
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