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ZrO 2 ‐Transformation‐Toughened Glass‐Ceramics Prepared by the Sol‐Gel Process from Metal Alkoxides
Author(s) -
NOGAMI M.,
TOMOZAWA M.
Publication year - 1986
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.1151-2916.1986.tb04709.x
Subject(s) - tetragonal crystal system , materials science , crystallite , toughening , fracture toughness , ceramic , monoclinic crystal system , sol gel , composite material , toughness , metal , mineralogy , metallurgy , crystallography , chemistry , crystal structure , nanotechnology
Glasses of composition 3ZrO 2 O · 2SiO 2 were prepared by the sol‐gel process from metal alkoxides. Tetragonal ZrO 2 was precipitated by appropriate heat treatment at 1000° to 1200°C. The fracture toughness of these glass‐ceramics increased with increasing crystallite size of the tetragonal ZrO 2 , reaching ∼5.0 MN/m 3/2 at a size of ∼40 nm. The higher fracture toughness was attributed to tetragonal → monoclinic ZrO 2 transformation toughening.