Flowability of a mixture of two powders obtained by co-grinding, mixing and surface treatment

Afia David Kouadri-Henni (1, 2) , N. Azema (3) , A Benhassaine

1 LS2N - équipe RoMas - Robots and Machines for Manufacturing, Society and Services
2 LS2N - Laboratoire des Sciences du Numérique de Nantes
3 Pôle MSGC - Pôle Matériaux et Structures du Génie Civil

Usage properties of powder mixtures like flowability and floodability depend strongly on their granular characteristics: size, shape, surface and spread of particle size. The products used are mixtures elaborated from two micron sized powders, made of synthetic minerals. Their particle size distributions are each initially mono-modal, respectively 5 mm and 70 mm. The mixture elaboration procedure consists in making several successive combined stages of co-grinding, mixing and surface treatment by addition of surfactants. We obtain thus several mixtures M having different rheological behaviours and particle size distributions-ascertained on a electron i beam microscope. The results permitted in understanding the influence of the granular macrostructure and the effect of a surface treatment on a powder's rheological behaviour.

Mots clés: Particle size; Co-grinding; Surface treatment; Floodability; Flowability

Domaines: Matériaux

Afia David Kouadri-Henni, N. Azema, A Benhassaine. Flowability of a mixture of two powders obtained by co-grinding, mixing and surface treatment. Powder Technology, 1999, 103, pp.37 - 43. ⟨10.1016/S0032-5910(99)00012-1⟩. ⟨hal-02561926⟩