Effect of ZnO/K2O ratio on the crystallization sequence and microstructure of lithium disilicate glass-ceramics
作者： Dami Kim , Hyeong-Jun Kim , Sang-Im Yoo
DOI: 10.1016/J.JEURCERAMSOC.2019.05.032
关键词:
摘要: Abstract The effect of ZnO/K2O (Z/K) ratio on the crystallization sequence and microstructure lithium disilicate (Li2Si2O5: LS2) glass-ceramics was carefully investigated for SiO2-Li2O-K2O-ZnO-P2O5 system. Z/K ratios precursor glasses were varied from 0 to 3.5 while nucleating agent P2O5 glass modifiers ZnO plus K2O fixed have 1.5 4.5 mol% relative LS2, respectively. For samples prepared by two-stage heat treatments 500 °C 1 h 800 °C 2 h in air, LS2 nucleation rate increased with increasing due variation type II (Li2SiO3: LS) I (LS + LS2) addition an amorphous phase separation base glass. Consequently, ratio, crystalline within matrix continuously changed larger acicular ones smaller equiaxed ones.
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