巻号一覧
1964 巻 (1964)
- 40 号 p. 2-
- 39 号 p. 3-
- 38 号 p. 3-
- 37 号 p. 2-
1964 巻, 40 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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稲垣 道夫, 野田 稲吉1964 年 1964 巻 40 号 p. 2-8
発行日: 1964/12/30
公開日: 2010/06/28
ジャーナル フリーThe relations between mechanical properties and texture were discussed for six electrographitized carbons, whi ch had the known mixing ratios of coarse grain (3-0.5mm. in size), medium grain (less than 0.5mm.) and fine powder of a petroleum coke. Tensile strength was measured at various temperatures between room temperature and 2500°C. Young's modulus and bending strength were measured at room temperature. Themal expansion coefficient was calculated from the expansion between 20° and 100°C, apparent porosity from benzen immersion density and bulk density, and anisotropy factor from the orientation function of graphite crystallite.
Electrographitized carbon was stronger under reduced pressure of 2×10-3 m mHg than in air by approximately 12%. Tensile strength measured various temperatures had a close relation to the grain size distribution. Both Young's modulus and thermal expansion coefficient could be also related to the grain size distribution using a similar formula. Tensile strength increased with increase in ambient temperature up to 2500°C. At 1100°, 1500°, 2000° and 2500°C, the ratios of high temperature strength to room temperature strength were approximately the same for all samples and the average values of the ratio were 1.19, 1.29, 1.50 and 1.76, respectively. The apparent linear relation between logarithm of strength and apparent porosity was found. The similar relation between logarithm of strength and anisotropy factor was also found.抄録全体を表示PDF形式でダウンロード (976K) -
上野 敦行, 岡 俊平1964 年 1964 巻 40 号 p. 9-18
発行日: 1964/12/30
公開日: 2011/03/01
ジャーナル フリーIn Japan, monthly, several handreds tons of carbon black are produced in the synthetic gas (H2+CO) furnaces of the Texaco process. However, commercial uses of such carbon has not yet been developed. In this paper, the authors studied the fundametal physico-chemical properties of such byproduct carbon black and tried to find out the way of profitable utilization, especially as the some material for the dry battery industry.
The following 10 properties were studied, and compared with those of the acetylene black, which is generally used as the dry battery some material, and sometimes with those of the natural graphite and the activated charcoal: (1) electric resistances under the pressures of 10-200 kg/cm2, (2) true density, (3) apparent density, (4) moisture absorption, (5) hydrochloric acid adosorption, (6) oil adsorption, (7) iodine adsorption, (8) ash content and composotion, (9) particle size and surface area by electron micrography and adsorption properties, (10) stereoscopic observations of the chain structure by electron micrograph.
As the results, it was found out that, the electric resistance of such byproduct carbon black was somewhat lower than that of the acetylene black, and the chain structures of both carbon were comparable, so the rise of such byproduct carbon in the dry battery industry was supposed to be hopeful, its higher ash content, about 4-9 times that of the acetylene black, suggested some draw back.抄録全体を表示PDF形式でダウンロード (8022K) -
長沖 通, 富永 洋一郎1964 年 1964 巻 40 号 p. 19-24
発行日: 1964/12/30
公開日: 2010/06/28
ジャーナル フリーOxdation of pyrolytic graphite (PG) was studied as a function of temperature of oxidation and deposition. The oxidation was performed in atmospheric air in the range of 650-950°C. Oxidation rates and activation energies were determined for the basal planes and the edge planes of the PG. PG used in this experiment were deposited at 1700-2300°C and annealed at 3200°C. Each sample cut into four pieces having different edge or basal surface area ratio. These pieces were oxidized simultaneously in an electric furnace. Oxidation rates on edge and basal planes were determined separately by extrapolating the linear line obtained by plotting of edge or basal surface area ratios vs. oxidation rates of samples. PG annealed at 3200°C was oxidized faster at the edge than the basal plane by a factor of about 10. For PG without being annealed, however, oxidation proceeded preferentially on the edge plane at low temperature, but at high temperature the basal plane oxidized faster than the edge plane. After oxidation, some circular pits occured on the basal plane of PG without being annealed. Oxidation rate of PG annealed as well as without being annealed depends on temperature of deposition.抄録全体を表示PDF形式でダウンロード (2844K)
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