Compression of polymer bound alumina agglomerates at the micro deformation scale

In this paper, the mechanical properties of alumina particle based agglomerates, prepared in a tumble mixer by using a poly (vinyl alcohol) (PVA) binder (ca. 5% by volume) in conjunction with water solvent, are described at a micro deformation level. Uniaxial compressive deformation profiles of these alumina agglomerates, typically 180–200 μm in diameter, are reported and their diverse behaviour during compression have been observed, which vary from a clear brittle rupture to progressive ductile deformation. However, certain common patterns of the agglomerate reaction force response, as a function of the compressive displacement, are identified, such as the similarities in the reloading response after each discrete fracture event. The Hertz Theory and a slope and peak force analysis are applied to establish the common patterns and trends, and generalize the intrinsic deformation characteristics of these agglomerates.