Servizio Comunitario di Informazione in materia di Ricerca e Sviluppo - CORDIS

Drying strategy for homogeneous and graded powder compacts processed in non-aqueous media

K.U.Leuven developed a drying technique to avoid the formation of drying cracks in complex shaped components with a non-uniform wall-thickness, colloidally processed from aqueous or non-aqueous media. In this technique, the solvent is pressed out of the green wet body under isostatic pressure. For this purpose, the wet component is packed in a plastic bag and cold isostatically pressed. To absorb the solvent, absorbing paper is inserted in the plastic bag around the component. Under the influence of a small isostatic pressure of about 5 MPa, the excess solvent contained in the component is accumulated by the absorbing material reducing the residual amount of solvent in the component below the critical level. The isostatic pressure prevents crack formation in the deposit during drying, allows a rapid solvent removal and increases the green strength.

Reported by

K.U.Leuven - Department of Metallurgy and Materials Engineering
Kasteelpark Arenberg 44
3001 Leuven
Belgium
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