金型プレス成形体の密度推定に関する実験的研究

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In order to estimate green density from forming condition and powder properties, uniaxial pressing was studied. Many kinds of high purity alumina powders were used as sample. They have different crystal phases and were made by many production process. As-received powders were pressed after added with a certain amount of water, and powders which were milled, spray dried were also pressed. Sample powders were evaluated by specific surface area, particle size, bulk density, tap density, XRD and TEM observation of the primary particles. The green density was analyzed by the powder properties and the following results were obtained. (1) The experimental equation connecting the green density and the pressing pressure was reconfirmed. Two constants in the experimental equation can be correlated to the tap density, and the estimated green density by the empirical equation agreed well with the experimental one. (2) Powders having round or bulky primary particles are compacted well without powder preparation, but the densification can be hardly improved by the powder preparation, such as milling and spray drying, on the contrary, powders having dendritic primary particles are not densified, but the powder preparation is effective to improvement of densification. (3) The relationship between the green density and the pressing pressure become straight lines which pass through one point on semi-logarithmic graph, if the crystal phase of powder is the same.
社団法人日本セラミックス協会の論文
1992-03-01

金型プレス成形体の密度推定に関する実験的研究

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