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Volume 29, Issue 9
Displaying 1-8 of 8 articles from this issue
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Toshio OSHIMA1992 Volume 29 Issue 9 Pages 661
Published: September 10, 1992
Released on J-STAGE: April 30, 2010
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Mitsukuni MIZUNO, Genji JIMBO1992 Volume 29 Issue 9 Pages 662-668
Published: September 10, 1992
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn the preceding paper, it was reported that the specific pressure fluctuations with several cyclic modes were observed during uniaxial compression of an ultrafine powder bed. It was also reported that this phenomenon was deduced to always be associated with the formation of an unhomogeneous packing state or thin plate-like lamination layer in the bed.
In this paper, several modes of pressure fluctuations generated during uniaxial compression at a constant rate were reported for various combinations of experimental conditions such as particle size, initial height of powder bed, cross-head speed, surface roughness of the cylinder wall and the gap between the piston and the cylinder. The resulting fluctuation patterns were classified into five modes.
The pressure fluctuation was found to be cyclic in nature, and the moving distance of the piston per one cycle was measured. The thickness and its distribution of the lamination layer were observed and measured by a microscope. It was found that the lamination layer thickness is equivalent to the moving distance of the piston per one cycle of pressure fluctuation.View full abstractDownload PDF (915K) -
The Effect of the Feed Rate on Separation EfficiencyKenichi YAMAMOTO, Manabu MAKINO, Masunori SUGIMOTO1992 Volume 29 Issue 9 Pages 669-675
Published: September 10, 1992
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSTo investigate the effect of feed rate F on shape separation efficiency η of the rotating conical disk with a spiral scraper for irregular particles, the shapes of particles separated on the disk were evaluated by an index ρ(tu) of rolling frictional characteristics of a particle closely related to its three-dimensional shape. The results obtained were as follows:
1. The separation efficiency η*m under hindered traveling conditions along the scraper (at larger F) depends on the separation characteristics of individual particles under the unhindered traveling condition (at F≈0), and on the number of particles arranged normal to the spiral scraper.
2. Optimal operating conditions could be derived from the above correlation.View full abstractDownload PDF (947K) -
Yuji MIDO, Hiroshi SUZUKI, Kazunori SAKAMOTO, Keijiro TERASHITA1992 Volume 29 Issue 9 Pages 676-681
Published: September 10, 1992
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSMetal particles have thus far been investigated at high recording densities. We introduced the twin-screw compounding extruder for the purpose of good dispersion of metal particles. First, metal particles and a binder were mixed, and the mixtures were continuously kneaded by the extruder. The kneaded mixtures were diluted and dispersed to make magnetic paint. The kneading state could be estimated by measuring the mixing power during kneading, while the dispersibility was evaluated as a coated media by gloss, density, surface rough-ness, microscopic observation, SEM observation and by using a magnetic hysterisys curve.
As a result, the evaluations of the kneading state and dispersibility were in good agreement. It was clarified that the higher the binder to pigment ratio was, the higher the mixing power was, which indicates good dispersion.
In conclusion, continuous kneading by the extruder was found to be effective in producing well-dispersed metal magnetic paint.View full abstractDownload PDF (3895K) -
Kazuo SUGIYAMA, Hideki TAKAHASHI, Shigeo KONNO, Setsuko TANAKA, Tsuneo ...1992 Volume 29 Issue 9 Pages 682-687
Published: September 10, 1992
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe surface states of aluminum nitride powders prepared by the direct nitriding of aluminum and the reduction-nitriding of alumina respectively, were investigated by means of X-ray photoelectron spectroscopy (XPS), temperature programmed desorption (TPD) and FT-IR spectroscopy. Four kinds of elements, aluminum, nitrogen, oxygen and carbon were observed on the surface of the samples. The surface concentration of oxygen was about 30 times larger than the bulk concentration, and the surface oxygen was involved in the formation of the thin layer of aluminum oxide and hydroxide. A new waterproof technique for aluminum nitride powders could be developed by treating them in a stream of carbon dioxide gas containing saturated steam at room temperature. The structure of the surface-stabilized samples was characterized by TPD and FT-IR measurements, and the surface thin film was composed of an ammonium aluminum carbonate hydroxide.View full abstractDownload PDF (2038K) -
From a View Point of Ultrafine Particle ResearchKeisaku KIMURA1992 Volume 29 Issue 9 Pages 688-694
Published: September 10, 1992
Released on J-STAGE: April 30, 2010
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Kei MIYANAMI1992 Volume 29 Issue 9 Pages 695-700
Published: September 10, 1992
Released on J-STAGE: April 30, 2010
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Toyokazu YOKOYAMA1992 Volume 29 Issue 9 Pages 714-716
Published: September 10, 1992
Released on J-STAGE: April 30, 2010
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