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Mechanical properties of dry-pressed powder compacts: Case study on alumina nanoparticles

: Kounga Njiwa, A.B.; Aulbach, E.; Rödel, J.; Neubrand, A.


Journal of the American Ceramic Society 89 (2006), No.8, pp.2641-2644
ISSN: 0002-7820
Journal Article
Fraunhofer IWM ()
Bruchzähigkeit; E-Modul; Aluminiumoxid; Nanopartikel; Grünkörper

Youngs modulus and fracture toughness of dry-pressed powder compacts of nanocrystalline alumina powders have been determined for different relative densities and average grain size. The powder with a grain size of 40 nm yielded a maximum Youngs modulus of 15 GPa and a peak fracture toughness of 0.12 MPa .m1/2. These high values are rationalized using a model based on contact flattening between particle spheres, which allows a discussion of the influence of grain size and particle packing on the mechanical properties of green bodies.