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33 巻, 5 号
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森脇 徹1996 年 33 巻 5 号 p. 360-370
発行日: 1996/05/10
公開日: 2010/04/30
ジャーナル フリーThe following problems were sloved by the dynamic analysis of the motion of an aggregate composed of grinding media and powder in planetary mills.
1) For both cases, the direction of revolution coincides with that of the mill pot rotation and not, the value of resultant acceleration on an aggregate is theoretically same, but it differs practically due to the difference in the slip of an aggregate on the pot wall.
2) The mode of aggregate motion (cataracting, cascading, or swing) is determined from the velocity index φ/φc and the friction coefficient for the unidirectional mill driven under a gravitation-free condition.
3) For both cases, gravity can be neglected and not in the acceleration field, the fundamentally same equation of dynamics can explain the behavior of aggregate swing.
4) The pressure exerted on the pot wall by accelerated aggregate, causing friction between the aggregate and wall varies during swing for gravitation-free case and for gravitation-affected one.抄録全体を表示PDF形式でダウンロード (2212K) -
木村 隆俊, 坂口 真士, 中村 雅彦1996 年 33 巻 5 号 p. 371-378
発行日: 1996/05/10
公開日: 2010/04/30
ジャーナル フリーSlip-casting has been widely used in forming both traditional and advanced ceramics. The rheology of the concentrated slurry has a significant influence on the productivity and the quality of ceramics product. Though the rheology of the slurry is closely relative to the agglomeration in the slurry, the structure of the particle agglomeration in the slurry has not been well understood.
The present investigation was undertaken to discuss an agglomerated structure of fine particles in the slurry from the rheological point of view. Furthermore, the influence of the particles agglomerated structure on the properties of as-cast bodies were also considered.
From the experimental results, it was found that the flocs models being proposed here can be applied to explain the microstructure of cast bodies. In addition, the compressive strength of agglomerates and the agglomerated structures of particles were considered to influence the casting process mechanism and the microstructure of the cast bodies.抄録全体を表示PDF形式でダウンロード (918K) -
谷口 貞司, 中村 雅彦, 河野 吉昭1996 年 33 巻 5 号 p. 379-384
発行日: 1996/05/10
公開日: 2010/04/30
ジャーナル フリーRaw powders, such as ordinary portland cement, admixture, fine aggregate, dispersant and thickener for building materials, were treated with a high-velocity pneumatic double-stage impactor. The process of becoming globular has been practically applied to building materials to investigate the effects on the basic physical properties of the treated composite powders due to modification, including pore size distribution, water saturation capacity and apparent porosity, so as improve the frost resistance and the strength of building materials.
The results indicate that the process of becoming globular can improve the frost resistance and the strength of building materials. This is because the structure of building materials is densified by the compacted powders after which the minimum kneading water/cement ratio and the volume and size of the micropores in the building materials are reduced. The grasp of vinylon fibers with cement in the building materials was improved by an optimum roughed surface of vinylon fibers by being impacted with powders and by the effective adhesion among vinylon fibers and treated composite powders.
Thus, the effect of the reinforcement of vinylon fiber can be improved.抄録全体を表示PDF形式でダウンロード (1974K) -
田中 善之助, 岡田 成敏, 木村 吉伸, 内海 良二1996 年 33 巻 5 号 p. 385-388
発行日: 1996/05/10
公開日: 2010/04/30
ジャーナル フリーComminution process have been utilized in various kinds of industry recently. In this process, comminuted products are contaminated by guest iron particles that are produced by abrasion of machine of crusher, mill, etc. Therefore discoloration, deterioration of mechanical properties and degradation of refractories arise from the contamination. Elimination of these particles is expected from the mixture of fine products and iron guest particles.
In this study, the operational condition and efficiency to remove iron particels contained in fine products economically was examined with magnetic separation in dry process. So iron contents are reduced down to 1%.抄録全体を表示PDF形式でダウンロード (387K) -
凝集スラリー中のフロックサイズとレオロジー特性及び表面電位との関連性について村田 茂一, 中村 雅彦, 木村 隆俊1996 年 33 巻 5 号 p. 389-395
発行日: 1996/05/10
公開日: 2010/04/30
ジャーナル フリーThe flocculation of particles in a condensed ceramic powder slurry was investigated as a function of the concentration of cationic polyelectrolyte from rheological and colloid chemical points of view. The results obtained are summarized as follows;
(1) Flocculation occurs in two stages. In the first stage, rapid growth of flocs occurs showing that a consistency index (K) decreases toward the minimum value. Then a zeta potential(ζ) becomes zero. There is a rather moderate growth of flocs in the second stage compared to the first stage indicating increases in (K) and (ζ).
(2) There are two types of behavior in the second stage. One is that the flocs grow showing the increase in (K); the other is that the flocs show the saturation in the value of (K).
(3) The important factors for flocculation control are particle diameter and its corresponding polymer concentration in a given solid loading.
(4) Consistency index (K) is effective as a measure for an evaluation of the change of the interaction force among flocs in flocculated slurries with the polymer.抄録全体を表示PDF形式でダウンロード (809K) -
凝集スラリーのレオロジー測定によるフロック間相互作用について村田 茂一, 中村 雅彦, 木村 隆俊1996 年 33 巻 5 号 p. 396-403
発行日: 1996/05/10
公開日: 2010/04/30
ジャーナル フリーThe interaction among flocs was discussed from the rheological properties of ceramic slurries as a function of the volume fraction of medium involving a polyelectrolyte in two stages of flocs formation. The results are summarized as follows:
In the stage of rapid flocs formation, the dominant factor is the volume fraction of the medium isolated from the slurry. Because the polymer breaks the network structure of particles trapping the medium, the interactions between the flocs and the medium separated by the polymer become lower than those among particles due to network structuring.
In the stage of moderate flocs formation, the dominant factor is the floc. Bacause the polymer makes the interparticle distance in a floc narrow by bridging, the interactions among the flocs become higher than those between the flocs and the medium.
Consequently, the interactions of the flocs and the medium and among the flocs at the two stages converge on the characteristic point of the volume fraction of the medium which may indicate the closest-packed structure of the flocs. The volume fraction of the medium at that point may correspond to the point of water content in a floc.抄録全体を表示PDF形式でダウンロード (996K) -
伊藤 光弘, 小沼 栄一1996 年 33 巻 5 号 p. 404-409
発行日: 1996/05/10
公開日: 2010/04/30
ジャーナル フリーPDF形式でダウンロード (688K) -
青木 圭子, 秋山 鐵夫1996 年 33 巻 5 号 p. 410-413
発行日: 1996/05/10
公開日: 2010/04/30
ジャーナル フリーPDF形式でダウンロード (349K) -
田中 真人1996 年 33 巻 5 号 p. 414-419
発行日: 1996/05/10
公開日: 2010/04/30
ジャーナル フリーPDF形式でダウンロード (692K) -
堀内 貴洋1996 年 33 巻 5 号 p. 434-436
発行日: 1996/05/10
公開日: 2010/04/30
ジャーナル フリーPDF形式でダウンロード (316K)
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