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首页> 外文期刊>日本セラミックス協会学術論文誌 >Slip Casting of Alumina Powder Mixtures with Bimodal Size Distribution –Influence of Particle Size Difference between Fine and Coarse Powders on Packing and Consolidation Process-
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Slip Casting of Alumina Powder Mixtures with Bimodal Size Distribution –Influence of Particle Size Difference between Fine and Coarse Powders on Packing and Consolidation Process-

机译：具有双峰尺寸分布的氧化铝粉末混合物的滑模铸造–细粉和粗粉之间的粒径差异对包装和固结过程的影响-

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摘要

Slips prepared from bimodal size distributedalumina powder mixtures, which consisted of 30 percent finepowder and 70 percent coarse powder, were cast. The twoaverage particle sizes of the bimodal distribution were varied.When the difference between the average particle sizes wassmall, green compacts had a low packing density and uniformpacking structure. In this case, the fine and coarse particles weredeposited by filtration of gypsum mold, due to the high viscosityof the slips, an insufficient dispersion of the fine particles andthe small size of the coarse particles. On the other hand, whenthe difference between the average particle size was large, greencompacts had a high packing density and nonuniform packingstructure. In this latter case, the coarse particles were firstdeposited by sedimentation to form the skeletal structure; then,the fine particles percolated through the voids of the skeletalstructure by filtration and were deposited in the voids. Onapproaching the bottom part of the green compacts, the skeletalstructure showed increased density. Since the water absorptionrate was slow, the fine particles did not fill the voids sufficiently.As a result, the maximum packing density of 84 percent wasobtained in the bottom part of the green compact. The packingdensity decreased with increasing distance from the bottom part of the specimen.
机译：铸造由双峰型分布的氧化铝粉末混合物制成的粉浆，该混合物由30％的细粉和70％的粗粉组成。双峰分布的两个平均粒径是变化的。当平均粒径之间的差异较小时，生坯具有较低的堆积密度和均匀的堆积结构。在这种情况下，由于泥浆的高粘度，细颗粒的分散不充分和粗颗粒的尺寸小，因此通过石膏模具的过滤来沉积细颗粒和粗颗粒。另一方面，当平均粒径之间的差异较大时，生坯具有高堆积密度和不均匀堆积结构。在后一种情况下，首先通过沉淀沉积粗颗粒以形成骨骼结构。然后，细颗粒通过过滤渗透穿过骨骼结构的空隙，并沉积在空隙中。在接近生坯的底部时，骨骼结构显示出增加的密度。由于吸水速度慢，细小颗粒无法充分填充空隙，结果在生坯的底部获得了84％的最大堆积密度。堆积密度随着与样品底部的距离增加而降低。

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