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Viscous Sintering and Mechanical Properties of 3Y‐TZP‐Reinforced LAS Glass‐Ceramic Composites
Author(s) -
Choi Se Y.,
Ahn Joon M.
Publication year - 1997
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.1151-2916.1997.tb03223.x
Subject(s) - materials science , tetragonal crystal system , monoclinic crystal system , composite material , aluminosilicate , sintering , microstructure , fracture toughness , phase (matter) , crystallization , ceramic , toughness , crystal structure , crystallography , chemical engineering , chemistry , biochemistry , organic chemistry , engineering , catalysis
The densification of lithium aluminosilicate glass‐ceramic composites strongly depended on dispersed 3‐mol%‐Y 2 O 3 ‐tetragonal‐ZrO 2 ‐polycrystal (3Y‐TZP) content, rather than the crystallization of a parent glass phase. Because of the reaction between 3Y‐TZP and the glass phase, tetragonal‐ZrO 2 transformed to monoclinic‐ZrO 2 with twinned structure because of the dissolution of Y 2 O 3 , and ZrSiO 4 formed. Composites containing >50 wt% 3Y‐TZP were characterized by fully densified microstructures and decreased tetragonal‐to‐monoclinic transformation. Fracture toughness increased by almost a factor of 3, which was attributed mainly to stress‐induced phase transformation of tetragonal‐ZrO 2 particles.