MECHANICAL-PROPERTIES OF SURFACE COMPOSIT E-PARTICLES COATED WITH FINER PARTICLES

The effect of the coated composite surface of particles on the mechani cal properties of the powder bed was investigated. Polyethylene-silica surface composite powder was prepared at several coating ratios with Hybridizer. Various tests on mechanical properties of the powder bed w ere carried out with the prepared powder, and the following results we re obtained: The ultimate tensile strength depends only on the conhesi ve force between particles, and the contact probability model of compo site particles led to good agreement between the experimental and calc ulated values. The coefficient of internal friction and cohesive shear strength were influenced due to the interlocking effect of the surfac e roughness of composite particles. The effects of coating particles b ecame small with dynamic properties like angle of repose. It is possib le to control the mechanical properties in a stepwise fashion by chang ing the coating ratio of the particles.