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  4. Nanoindentation hardness of submicrometer alumina ceramics
 
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2001
Journal Article
Title

Nanoindentation hardness of submicrometer alumina ceramics

Abstract
Nanoindentations at loads of 20-200 mN were performed on submicrometer sintered alumina ceramics of different residual porosity. The indentation size effect of the hardness can be obtained without variation of the max. load directly from loading curves, if the Young's modulus of the material is known and if the shape of the penetration curve is analyzed carefully. Similar influences of testing load (indentation size effect), grain size and porosity are obsd. as known from conventional measurements. At small testing loads of 25-50 mN, the Vickers hardness of dense submicron corundum ceramics increases to 25-30 GPa depending on the microstructure.
Author(s)
Krell, A.
Schädlich, S.
Journal
Materials Science and Engineering, A. Structural materials, properties, microstructure and processing  
DOI
10.1016/S0921-5093(00)01818-9
Language
English
Fraunhofer-Institut für Keramische Technologien und Systeme IKTS  
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
Keyword(s)
  • alumina ceramics

  • hardness

  • indentation

  • porosity

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