Abstract
The influence of alumina content (0‐15 wt% Al2O3) on the indentation strength, fracture toughness (KIc), and crystal structure of fluorcanasite (Al2O3‐CaO‐F‐K2O‐Na2O‐SiO2) glass‐ceramics was analyzed. Increasing the Al2O3 content from 0 wt% (CAN0) to 8 wt% (CAN8) caused the mean indentation strength and KIc values to decrease from 213 ± 14 MPa and 2.7 ± 0.1 MPa·m1/2, respectively, for the CAN0 glass‐ceramic to 78 ± 16 MPa and 1.3 ± 0.2 MPa·m1/2, respectively, for the CAN8 glass‐ceramic. Increased Al2O3 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 Al2O3 to fluorcanasite glass caused a transformation from canasite to leucite.
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