The effects of Fe2O3 and Co3O4 on microstructure and properties of foam glass from soda lime waste glasses

ABSTRACT Alumina-Glass compositions were prepared to evaluate the effect of glass as sintering aids. The composites showed densification below 1100°C. The highest density values (~95%) were obtained for compositions based respectively on borosilicate (G2 and G3) and soda lime glasses (G4), all [A1] [A2] containing Na in the precursor powder. Samples G1 (K-based) and G5 (no K or Na in the precursor glass powder) presented irregular morphology with the presence of intergranular porosity. The composition G2, G3, and G4 presented uniform morphology corresponding to higher densification.

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Comparison of Foam Glass-Ceramics with Different Composition Derived from Ark Clamshell (ACS) and Soda Lime Silica (SLS) Glass Bottles Sintered at Various Temperatures

Materials ◽

10.3390/ma14030570 ◽

2021 ◽

Vol 14 (3) ◽

pp. 570

Author(s):

Noor Aizat Noor Hisham ◽

Mohd Hafiz Mohd Zaid ◽

Sidek Hj Ab Aziz ◽

Farah Diana Muhammad

Keyword(s):

Bulk Density ◽

Mechanical Performance ◽

Low Cost ◽

Foam Glass ◽

Glass Ceramics ◽

Physical And Mechanical Properties ◽

Total Porosity ◽

Soda Lime ◽

Maximum Expansion ◽

Foam Glass Ceramics

Soda lime silica (SLS) waste as the source of silica (SiO2) and ark clamshell (ACS) as the foaming agent has been utilized to fabricate the low-cost and lightweight foam glass-ceramics. A series of 1 and 6 wt% foam glass-ceramics were successfully prepared by the conventional solid-state sintering method at various sintering temperatures for 60 min. The bulk density of the samples has achieved minimum density (1.014 g/cm3) with maximum expansion (62.31%) at 6 wt% of the ACS content sintered at 800 °C for 60 min. The bulk density increases while the linear shrinkage and total porosity decrease with the progression of ACS contents and sintering temperature, where the results correspond with the FESEM micrograph. The result of XRD and FTIR transmittance spectra have shown that the formation of wollastonite crystal has occurred starting at 6 wt% of the ACS content sintered at 800 °C for 30 min. The highest mechanical performance (3.90 MPa) with an average total porosity (8.04%) is observed for the sample containing 1 wt% of ACS. It can be concluded that the composition of foam glass-ceramics (1 and 6 wt%) and sintering temperatures give significant results to the structural, physical, and mechanical properties of the fabricated foam glass-ceramics.

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Effect of sintering temperatures and foaming agent content to the physical and structural properties of wollastonite based foam glass-ceramics

Science of Sintering ◽

10.2298/sos2003269j ◽

2020 ◽

Vol 52 (3) ◽

pp. 269-281

Author(s):

Suhail Jaafar ◽

Mohd Zaid ◽

Khamirul Matori ◽

Mohd Ghazali ◽

Mohd Shofri ◽

...

Keyword(s):

Water Absorption ◽

Structural Properties ◽

Glass Ceramic ◽

Powder Processing ◽

Sintering Temperature ◽

Linear Expansion ◽

Foam Glass ◽

Soda Lime ◽

Glass Waste ◽

Foaming Agent

This study aims to fabricate low-cost foam glass-ceramic using soda-lime-silica (SLS) glass waste and clamshells (CS) as foaming agent in content between 1 and 12 wt.% by conventional powder processing method. The samples were undergoing sintering process between 700 and 1000?C with holding time of 30 minutes and characterized according to the physical and structural properties. Samples containing 3 wt.% CS treated at 800?C show the greatest size of porosity. As the sintering temperature increased, the samples tend to become less dense. However, for the samples sintered at 900 and 1000?C, the trend of the density changes because of the excess CO2 gases generated during the heat treatment process promotes an increase in internal pressure, which results in the rupture of the pore walls. For linear expansion, for samples with a sintering temperature of 800?C and higher, the increment of the temperature will lead to the decrement of linear expansion (%). As the sintering temperature increases from 700 to 800?C, the water absorption (%) increases. However, the percentage of water absorption decreases with the further increment of sintering temperature. The XRD characterization showed the formation of wollastonite phase (CaSiO3) and further revealed the formation of greater peaks of CaSiO3 at the higher sintering temperatures. The results of compressive mechanical strength between 0.15 and 1.50 MPa indicate that the obtained glass-ceramic foams have potential for building material applications.

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