Characterisation of flowability of cohesive powders by testing small quantities of weak compacts--颗粒学报PARTICUOLOGY

Wang, C., Hassanpour, A., & Ghadiri, M. (2008). Characterisation of flowability of cohesive powders by testing small quantities of weak compacts. Particuology, 6(4), 282–285. https://doi.org/10.1016/j.partic.2008.05.004

Characterisation of flowability of cohesive powders by testing small quantities of weak compacts

Chuan Wang, Ali Hassanpour^*, Mojtaba Ghadiri

Institute of Particle Science and Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom

10.1016/j.partic.2008.05.004

Volume 6, Issue 4, August 2008, Pages 282-285

Received 2 January 2008, Accepted 14 May 2008, Available online 10 July 2008.

E-mail: A.Hassanpour@leeds.ac.uk

Highlights

Abstract

Characterisation of flowability of small quantities of cohesive powders is of great industrial interest, particularly for the pharmaceutical sectors, where a limited amount of material is available or the material is not easily accessible. In this paper, ball indentation on a powder bed is evaluated for flow characterisation of small quantities of cohesive powders at low levels of consolidation pressures. In parallel, the bulk powder is subjected to the common test method of unconfined direct compression. Analogous to indentation hardness testing, for which the indentation pressure is related to the flow stress, a constraint factor (C) is defined relating the unconfined yield stress and indentation pressure. The constraint factors for the test powders have been evaluated, enabling an easy method to characterize the flow behaviour of cohesive powders.

Graphical abstract

Keywords

Flowability; Cohesive powder; Indentation on powder bed; Constraint factor

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