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Mechanical Properties of Dry‐Pressed Powder Compacts: Case Study on Alumina Nanoparticles
Author(s) -
Kounga Njiwa A. B.,
Aulbach E.,
Rödel J.,
Neubrand A.
Publication year - 2006
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2006.01088.x
Subject(s) - materials science , nanocrystalline material , fracture toughness , grain size , composite material , particle size , nanoparticle , modulus , sintering , particle (ecology) , metallurgy , nanotechnology , chemical engineering , oceanography , geology , engineering
Young's 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 Young's modulus of 15 GPa and a peak fracture toughness of 0.12 MPa·m 1/2 . 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.