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Volume 1968 (1968)
- Issue 55 Pages 114-
- Issue 54 Pages 80-
- Issue 53 Pages 50-
- Issue 52 Pages 2-
Volume 1968, Issue 53
Displaying 1-5 of 5 articles from this issue
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Shigeji Hagiwara, Toshisada Makiguchi1968 Volume 1968 Issue 53 Pages 50-56
Published: May 31, 1968
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe tests were carried out in order to explain the variation of crystal lattice strain in various graphites by heat-treatment . The flake, spheroidal and temper graphites are prepared from gray, calcium ductile and black heart malleable cast irons by electrolytic extraction. The specimens are heat-treated under argon or vacuum at 1200°C, 1500°C, 1800°C, 2000°C, 2400°C, 2600°C and 3050°C, respectively . The crystal lattice strain in graphites is analyzed from the equation as follow,
β (obs) ·cosθ=η·sinθ+K·λ/D (hkl)
Where β (obs) is the half maximum line breadth, θ the scattering angle, η the parameter of lattice strain (Δd/d), K the shape factor, λ the wavelength and D (hkl) the crystallite size. The relation between β (obs) ·cosθ and sinθ obtained from (00l) lines is comparatively linear. As result, the variation of lattice strain with heat treatment is the largest in temper graphite, slightly smaller in spheroidal graphite and almost nothing in flake graphite.View full abstractDownload PDF (5658K) -
I The Reaction of Oxidation on Graphite Surface in Sulfuric AcidRokuro Fujii, Kanji Matsuo1968 Volume 1968 Issue 53 Pages 57-60
Published: May 31, 1968
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe anodic oxidation of 3000°C annealed pyrolytic graphite electrode was studied by the technique of potential sweep at linearly changing from 0.00V to+1.50V vs PHE, and by measuring the change of (00l) X-ray diffraction patterns, in 10M/l sulfuric acid electrolyte at 25°C.
Experimental results are summerized as follows:
(1) On the anodic potential sweep curves, two oxidation current peaks are observed as a small peak at about+1.2V and major current beyond+1.3V. The for, mer peak corresponds to the adsorption of oxygen on graphite surface and the latter to formation of graphite bisulfate lamellar compound prior to oxygen evolution.
(2) On the cathodic sweep curves, the reduction current that appears as a peak between+1.30V and+1.00V corresponds to the decomposition of lamellar compound.View full abstractDownload PDF (1941K) -
I. Petroleum CokeMichio INAGAKI1968 Volume 1968 Issue 53 Pages 61-66
Published: May 31, 1968
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe relations among X-ray parameters, c0, Lc (002), Lc (004), La (110) and Lc (112), were investigated on a petroleum coke heat-treated in the flow of nitrogen and under reduced pressures of 0.1, 2 and 4Torr. at various temperatures and residence times. The strain along the c-axis, εc, was calculated from the slope of the plot of 1/Lc (00l) vs. l. From these experimental data, the graphitization process of the petroleum coke seemed to be divided into at least two stages. In the first stage, the mean lattice spacing c0, is larger than 6.85Å and the strain εc decreases remarkably with heat treatment. In the second stage, c0 is smaller than 6.85Å, the apparent crystallite size Lc (00l) increases and εc decreases gradually with heat treatment. The modulation of (hk) diffraction band, for example (11) band, begins to appear, i.e. the three-dimensional graphite structure begins to develope, from the beginning of the second stage. These two stages of graphitization process correspond well to those proposed by other authors. The difference in heat treatment has no detectable effect on the relations among X-ray parameters of the coke.View full abstractDownload PDF (730K) -
[in Japanese]1968 Volume 1968 Issue 53 Pages 67-72
Published: May 31, 1968
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (3568K) -
[in Japanese], [in Japanese]1968 Volume 1968 Issue 53 Pages 73-76
Published: May 31, 1968
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (542K)
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