Paper Title:
Fracture Toughness of Si3N4 Based Ceramics with Rare-Earth Oxide Sintering Additives
  Abstract

Fracture toughness of hot-pressed silicon nitride and Si3N4+SiC nanocomposites prepared with different rare-earth oxides (La2O3, Sm2O3, Y2O3, Yb2O3, Lu2O3) sintering additives have been investigated by Chevron Notched Beam, Indentation Strength and Indentation Fracture techniques. The fracture toughness values of composites were lower due to the finer microstructures and the lack of toughening mechanisms. In the Si3N4 with higher aspect ratio (Lu or Yb additives) crack deflection occurred more frequently compared to the Si3N4 doped with La or Y, which was responsible for the higher fracture toughness.

  Info
Periodical
Edited by
J. Dusza, R. Danzer, R. Morrell and G.D. Quinn
Pages
377-381
DOI
10.4028/www.scientific.net/KEM.409.377
Citation
P. Tatarko, Š. Lojanová, J. Dusza, P. Šajgalík, "Fracture Toughness of Si3N4 Based Ceramics with Rare-Earth Oxide Sintering Additives", Key Engineering Materials, Vol. 409, pp. 377-381, 2009
Online since
March 2009
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$32.00
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