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Partial Stabilization of Tetragonal Zirconia in Oxynitride Glass‐Ceramics
Author(s) -
Höche Thomas,
Deckwerth Martin,
Rüssel Christian
Publication year - 1998
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.1151-2916.1998.tb02584.x
Subject(s) - cubic zirconia , tetragonal crystal system , materials science , nucleation , crystallization , microstructure , ceramic , nitrogen , phase (matter) , chemical engineering , composite material , mineralogy , chemistry , organic chemistry , engineering
Nitrogen (via a polymeric AlN precursor) and ZrO 2 are introduced into a MgO‐CaO‐Al 2 O 3 ‐SiO 2 ‐glass. Subsequent crystallization of the glass results in a fine‐grained oxynitride glass‐ceramic. The microstructure of the latter is found to be entirely different for nitrogen concentrations of 4.85 and 9.94 mol%. Not only do the phase contents differ, but also tetragonal zirconia is more effectively stabilized at higher nitrogen concentrations. Partial stabilization of tetragonal zirconia is not due to nitrogen incorporation but is based on an indirect effect: the spherical morphology of tetragonal zirconia precipitated at higher nitrogen contents suppresses the nucleation of the martensitic transformation. The beneficial effects of the introduction of nitrogen and the simultaneous incorporation of zirconia into a glass‐ceramic result in overall improved mechanical properties.