Plastic/Brittle Behavior of Consolidated Bodies: Role of Particle Pair Potential
Technical rept. for 31 Aug 2004-31 Jul 2006
CALIFORNIA UNIV REGENTS SANTA BARBARA OFFICE OF RESEARCH
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Colloidal powder processing can improve the reliability and strength of ceramics by reducing the size of strength degrading heterogeneities through filtering the powder prior to consolidation. Removing heterogeneities greater than a given size is equivalent to a proof test, namely, truncating the strength distribution. Although significant property improvements can be made with the colloidal approach, new forming methods-consistent with the removal of flaws, are still under development. This development requires knowledge relating the mechanical properties of saturated powder compacts to the forces between particles, similar to relating properties of crystalline materials to interatomic forces. The background to this program resides with the discovery that short-range repulsive potentials can be developed that, when combined with the pervasive attractive van der Waals potential, produce an interparticle pair potential characterized by a potential well. This development has lead to new shape forming methods that are discussed at the end of this review.
- Ceramics, Refractories and Glass
- Properties of Metals and Alloys