Abstract
The authors developed a new powder forming technique, called as “Cyclic Cold Isostatic Pressing (C-CIP)”, by superimposing cyclic pressure wave onto a static hydraulic pressure. Using this method, we performed dry powder forming on two kinds of alumina powders which have different compaction characteristics, and measured the bulk density and the hardness of the green compacts. The green density increased remarkably as the number of repeating times of pressure increased. The rate of increasing density against the repeating times became larger as the maximum pressure became higher. The micro- Vickers hardness for slightly calcined body, which is closely connected with the green compacts, increased remarkably as the repeating times increased. Employing our new method, we can make the CIP pressure remarkably low in comparison with the ordinary CIP.
