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Effect of Alumina on the Strength, Fracture Toughness, and Crystal Structure of Fluorcanasite Glass‐Ceramics
Author(s) -
Zhang NaiZheng,
Anusavice Kenneth J.
Publication year - 1999
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.1151-2916.1999.tb02111.x
Subject(s) - materials science , fracture toughness , composite material , ceramic , indentation , crystal (programming language) , flexural strength , leucite , toughness , mineralogy , chemistry , computer science , programming language
The influence of alumina content (0‐15 wt% Al 2 O 3 ) on the indentation strength, fracture toughness ( K I c ), and crystal structure of fluorcanasite (Al 2 O 3 ‐CaO‐F‐K 2 O‐Na 2 O‐SiO 2 ) glass‐ceramics was analyzed. Increasing the Al 2 O 3 content from 0 wt% (CAN0) to 8 wt% (CAN8) caused the mean indentation strength and K I c values to decrease from 213 ± 14 MPa and 2.7 ± 0.1 MPa·m 1/2 , respectively, for the CAN0 glass‐ceramic to 78 ± 16 MPa and 1.3 ± 0.2 MPa·m 1/2 , respectively, for the CAN8 glass‐ceramic. Increased Al 2 O 3 concentrations (0‐15 wt%) significantly affected the crystal size, crystal shape, aspect ratio, and crystal aggregation characteristics of the fluorcanasite glass‐ceramics. The addition of greaterthan equal to8 wt% of Al 2 O 3 to fluorcanasite glass caused a transformation from canasite to leucite.