A compaction method to make uniformly dense ceramic bodies of complex shape

A method of uniaxial dry compacting homogeneously dense powdered bodies of complex shape without macroscopic defects has been developed. It is based on the self-alignment of uniform density regions within a green compact by controlling pressing forces to minimize die-wall friction effects. An equation is proposed that defines the density differential throughout the height of a green compact, which depends on geometrical parameters, and requires the controlled movement of die parts. This method decreases density gradients in complex shape bodies. It was applied to manufacture ceramic articles from nanopowder like impellers and plates with longitudinal holes.