The Effect of Zirconium Oxide on Properties and Crystallization of Soda-Lime Silicate Glass

In this study, the properties and crystallization of re-melted soda-lime silicate glass cullet added with Al2O3, CaCO3 and ZrO2 were investigated in order to study the potential usage as a parent glass for glass-ceramics. Al2O3, CaCO3 and ZrO2 were added into the 71SiO2-10Na2O-6K2O-5CaO-4MgO-2SrO-ZrO2-Al2O3 glass cullet to increase the crystallization of the glass. The glass batches (%wt) of (65-x) Cullet:13Al2O3:22CaCO3:xZrO2 (x = 0, 1, 2, 4, 6 and 8) were melted at 1500°C for 3 hours. The crystallization was investigated by Differential Scanning Colorimetry technique (DSC) and it was found that the glasses with 6 and 8 %wt of ZrO2 crystallized rapidly. It means that ZrO2 acted as the nucleating agent in this glass system. The major crystallines determined by X-ray diffraction technique (XRD) were silica (SiO2), wollastonite (CaSiO3) potassium silicate (K6Si3O9) and zirconium oxide (ZrO2). The thermal expansion of glasses determined by dilatometric method indicated the characteristic of glass-ceramics and the effect of ZrO2 on the thermal properties of glass. In conclusion, modifying the composition of soda-lime silicate cullet with Al2O3 CaCO3 and ZrO2 had potential to produce glass-ceramics.

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Investigation of the Properties of Soda-Lime Silicate Glass Doped with TiO2

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.979.128 ◽

2014 ◽

Vol 979 ◽

pp. 128-131 ◽

Cited By ~ 2

Author(s):

E. Meechoowas ◽

Usanee Pantulap ◽

T. Jitwatcharakomal

Keyword(s):

Silicate Glass ◽

Glass Structure ◽

Glass Ceramics ◽

Soda Lime ◽

Color Measurement ◽

Glass Cullet ◽

Calculated Activation Energy ◽

Lower Thermal Expansion ◽

Soda Lime Silicate Glass ◽

Calculated Activation

In this study, the properties of re-melted soda-lime silicate glass cullet doped with TiO2 were investigated in order to study the potentials to use as parent glass for glass-ceramics. TiO2 of 0.5, 1 and 3 mol% was doped into the 71SiO2-10Na2O-6K2O-5CaO-4MgO-2SrO-TiO2-Al2O3 glass cullet and melted at 1500°C for 3 hours, and then annealed at 550 °C. The optical and physical properties were examined. It was found that the refractive index and density of glasses were raised with increasing of TiO2 concentration. The optical properties measured by UV-Vis spectrophotometer showed that the UV edge in the absorption spectra was shifted to a higher wavelength, and the transmission at 583 nm was decreased. The CIE L*a*b* color measurement showed that the glasses were slightly colorless but the appearance of yellow increased with higher TiO2 concentration. Lower thermal expansion coefficient and higher glass transition temperature as well as the dilatometric softening point were observed as the concentration of TiO2 was increasing. Finally, the calculated activation energy was 476, 493, 506 and 637 kJ/mol with 0, 0.5, 1 and 3 mol% doped TiO2, respectively. At doped TiO2 of 3 mol%, the properties of glass were changed rapidly due to the substitution of [Ti4+] in local [Si4+] resulting in increasing the bond strength in glass structure.

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Feasibility of Producing Glass-Ceramics from a Mixture of Glass Cullet-Eggshell and Perlite

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.766.139 ◽

2018 ◽

Vol 766 ◽

pp. 139-144

Author(s):

Patiphan Nakkam ◽

Napat Chantaramee

Keyword(s):

Weight Loss ◽

Chemical Resistance ◽

Sodium Hydroxide Solution ◽

Glass Ceramics ◽

Soda Lime ◽

Nucleating Agent ◽

Chemical Compositions ◽

Glass Cullet ◽

X Ray Diffraction ◽

X Ray

Feasibility of producing glass-ceramics from cullet, eggshell and perlite was investigated. In this study, a nucleating agent was synthesized from calcined eggshell and expanded perlite prior to blend with soda-lime waste glass, and then sintered at temperatures ranging from 850 to 1050°C at a heating rate of 10°C/min for 30 - 180 minutes. The crystallization behavior of glass-ceramics was investigated by means of X-ray diffraction analysis and surface morphology, and the chemical compositions were evaluated by scanning electron microscopy and energy dispersive X-ray spectroscopy. Results showed that crystalline phase embedded in the glass phase were needle-like crystal of wollastonite, cristobalite and quartz. According to the chemical resistance test, the obtained glass-ceramics showed acceptable corrosion resistance particularly in acidic environment. The weight loss for glass-ceramics immersed in 1wt% of sodium hydroxide solution was 0.28 - 0.50 wt%, while weight loss due to 1vol% of sulfuric acid solution was 0.04 - 0.16 wt%.

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