Journal
CERAMICS INTERNATIONAL
Volume 48, Issue 9, Pages 12699-12711Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.01.139
Keywords
Lithium disilicate; Glass-ceramics; Crystallization; Nano hardness; Elastic modulus
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Funding
- Indian Institute of Technology Bombay
- Ministry of Human Resource Development, Govt. of India
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The effect of MgO content on glass structure, crystallization behavior, microstructure, and mechanical properties was investigated. Increased MgO content enhanced the participation of Al2O3 and [SiO4] tetrahedra, reducing non-bridging oxygen and increasing bridging oxygen in glass. The increased bridging oxygen resulted in a polymerized glass structure, suppressing crystallization and improving the properties of glass and glass-ceramics.
The effect of variation of MgO (1.5, 4.5 and 7.5 mol%) content on glass structure, crystallization behavior, microstructure and mechanical properties in a Li2O-K2O-Na2O-CaO-MgO-ZrO2-Al2O3-P2O5-SiO2 glass system has been reported here. Increased amount of MgO enhanced the participation of Al2O3 as a glass network former along with [SiO4] tetrahedra, reducing the amount of non-bridging oxygen (NBO) and increasing bridging oxygen (BO) amount in glass. The increased BO in glass resulted in a polymerized glass structure which suppressed the crystallization and subsequently increased the crystallization temperature, bulk density, nano hardness, elastic modulus in the glasses as well as the corresponding glass-ceramics. MgO addition caused phase separation in higher MgO (7.5 mol%) containing glass system which resulted in larger crystals. The nano hardness (-10 GPa) and elastic modulus (-127 GPa) values were found to be on a much higher side in 7.5 mol% MgO containing glass-ceramics as compared to lower MgO containing glass-ceramics.
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