Grading porous ceramics by centrifugal sintering Original Research Article

Graded porous structures in ceramics have conventionally been synthesized by applying centrifugal acceleration during sintering. A gradual change in porosity is caused by enhanced sintering using centrifugal force, which increases linearly along the radius of rotation. A theoretical understanding of the formation of graded structures has been demonstrated based on the kinetic model of liquid-phase sintering, which is considered to be driven by both capillary and centrifugal forces. The observed structure is in accordance with the theoretical approach which predicts linear shrinkage in the radial direction that is proportional to the power of one fifth of the distance from the surface.