The Effect of Spent Bleach Earth on the Properties of Sintered Green Glass Ceramic Composite

The purpose of this study is to investigate the effect of spent bleach earth (SBE) loading on the properties of green glass ceramic (GGC) composite. GGC was prepared using SBE and recycled soda lime silicate (SLS) glass. SLS glass was crushed then sieved to approximately 45µm. These GGC composites were formed with different weight fraction of SBE loading (40, 45 and 55 wt.%) by uniaxial dry pressing and sintered at different sintering temperature (700 °C, 750 °C and 850 °C). The sintering temperatures were selected based on Tg of the glass which is around 416 °C. The GGC specimens were analyzed in terms of its physical properties (density, water absorption and porosity), phase presence (X-Ray diffraction) and sintered microstructure (scanning electron microscopy). X-Ray diffraction pattern indicated that cristobalite, quartz and wallastonite phases were formed during sintering. It was found that the GGC with 45 wt.% of SBE loading sintered at 850 °C produced minimum water absorption which was 4.01% accompanied by density of 2.12 g/cm3 and a porosity of 8.49%. This shows that GGC composite produced with considerable higher amount of waste loading able to obtain acceptable physical durability.

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Effects of high pressure on stability of the nanocrystalline LiAlSi2O6 phase of a glass–ceramic composite: A synchrotron X-ray diffraction study

Physica B Condensed Matter ◽

10.1016/j.physb.2005.05.010 ◽

2005 ◽

Vol 365 (1-4) ◽

pp. 155-162 ◽

Cited By ~ 13

Author(s):

Kristina E. Lipinska-Kalita ◽

Gino Mariotto ◽

Patricia E. Kalita ◽

Yoshimichi Ohki

Keyword(s):

High Pressure ◽

Diffraction Study ◽

Glass Ceramic ◽

Ceramic Composite ◽

X Ray Diffraction ◽

X Ray ◽

Glass Ceramic Composite

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Bone bonding ability of some borate bio-glasses and their corresponding glass-ceramic derivatives

Processing and Application of Ceramics ◽

10.2298/pac1204183m ◽

2012 ◽

Vol 6 (4) ◽

pp. 183-192 ◽

Cited By ~ 15

Author(s):

Fatma Margha ◽

Amr Abdelghany

Keyword(s):

Heat Treatment ◽

Fourier Transform ◽

Glass Ceramic ◽

Glass Composition ◽

Glass Ceramics ◽

Soda Lime ◽

Phosphate Solution ◽

Borate Glasses ◽

X Ray Diffraction ◽

X Ray

Ternary borate glasses from the system Na2O?CaO?B2O3 together with soda-lime-borate samples containing 5 wt.% of MgO, Al2O3, SiO2 or P2O5 were prepared. The obtained glasses were converted to their glass-ceramic derivatives by controlled heat treatment. X-ray diffraction was employed to investigate the separated crys?talline phases in glass-ceramics after heat treatment of the glassy samples. The glasses and corresponding glass-ceramics after immersion in water or diluted phosphate solution for extended times were characterized by the grain method (adopted by several authors and recommended by ASTM) and Fourier-transform infrared spectra to justify the formation of hydroxyapatite as an indication of the bone bonding ability. The influence of glass composition on bioactivity potential was discussed too.

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Zinc containing borate glasses and glass-ceramics: Search for biomedical applications

Processing and Application of Ceramics ◽

10.2298/pac1404185a ◽

2014 ◽

Vol 8 (4) ◽

pp. 185-193 ◽

Cited By ~ 15

Author(s):

Amr Abdelghany ◽

Fatema Elbatal ◽

Hatem Elbatal

Keyword(s):

Glass Ceramic ◽

Corrosion Behaviour ◽

Glass Ceramics ◽

Soda Lime ◽

Dissolution Mechanism ◽

Borate Glasses ◽

X Ray Diffraction ◽

X Ray ◽

Before And After ◽

Diffraction Patterns

Ternary soda lime borate glass and samples with ZnO replacing CaO up to 10mol%were prepared and studied for their bone bonding ability. Fourier transform infrared (FTIR) absorption spectra of the prepared glasses before and after immersion in simulated body fluid (SBF), for one or two weeks, showed the appearance of calcium phosphate (hydroxyapatite (HA)) which is an indication of bone bonding ability. X-ray diffraction patterns were measured for the glasses and indicated the presence of small peaks related to hydroxyapatite in the samples immersed in SBF. The glasses were heat treated with controlled two-step regime to convert them to their corresponding glass-ceramic derivatives. FTIR and X-ray diffraction measurements of the glass-ceramic samples (before and after immersion in SBF) confirmed the appearance of HA which is influenced by ZnO content. The overall data are explained on the basis of current views about the corrosion behaviour of borate glasses including hydrolysis and direct dissolution mechanism.

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Investigation of CeTi2O6- and CaZrTi2O7-containing glass–ceramic composite materials

Canadian Journal of Chemistry ◽

10.1139/cjc-2016-0633 ◽

2017 ◽

Vol 95 (11) ◽

pp. 1110-1121 ◽

Cited By ~ 8

Author(s):

Elham Paknahad ◽

Andrew P. Grosvenor

Keyword(s):

Composite Materials ◽

Glass Ceramic ◽

Local Structure ◽

Glass Matrix ◽

Ceramic Composite ◽

Ceramic Composites ◽

X Ray ◽

Synthesis Conditions ◽

Ceramic Composite Materials ◽

Glass Ceramic Composite

Glass–ceramic composite materials are being investigated for numerous applications (i.e., textile, energy storage, nuclear waste immobilization applications, etc.) due to the chemical durability and flexibility of these materials. Borosilicate and Fe–Al–borosilicate glass–ceramic composites containing brannerite (CeTi2O6) or zirconolite (CaZrTi2O7) crystallites were synthesized at different annealing temperatures. The objective of this study was to understand the interaction of brannerite or zirconolite-type crystallites within the glass matrix and to investigate how the local structure of these composite materials changed with changing synthesis conditions. Powder X-ray diffraction (XRD) and Backscattered electron (BSE) microprobe images have been used to study how the ceramic crystallites dispersed in the glass matrix. X-ray absorption near edge spectroscopy (XANES) spectra were also collected from all glass–ceramic composite materials. Examination of Ti K-, Ce L3-, Zr K-, Si L2,3-, Fe K-, and Al L2,3-edge XANES spectra from the glass–ceramic composites have shown that the annealing temperature, glass composition, and the loading of the ceramic crystallites in the glass matrix can affect the local environment of the glass–ceramic composite materials. A comparison of the glass–ceramic composites containing brannerite or zirconolite crystallites has shown that similar changes in the long range and local structure of these composite materials occur when the synthesis conditions to form these materials or the composition are changed.

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Synthesis and Characterization of Porous ZrO2-Y2O3-TiO2 Ceramics Prepared by Coprecipitation

Materials Science Forum ◽

10.4028/www.scientific.net/msf.727-728.1387 ◽

2012 ◽

Vol 727-728 ◽

pp. 1387-1392 ◽

Cited By ~ 1

Author(s):

Luan M. Medeiros ◽

Fernando S. Silva ◽

Juliana Marchi ◽

Walter Kenji Yoshito ◽

Dolores Ribeiro Ricci Lazar ◽

...

Keyword(s):

Ceramic Composite ◽

High Strength ◽

Ceramic Composites ◽

Rice Starch ◽

X Ray Diffraction ◽

Zirconia Ceramics ◽

Pore Former ◽

X Ray ◽

Cold Pressed

Zirconium dioxide (zirconia) ceramics are known by its high strength and toughness and titanium dioxide (titania) ceramics has outstanding surface properties. The ceramic composite formed between the two oxides are expected to have advantages of both ceramics, especially when its surface area is increased by pores. In this work, ceramic composites of ZrO2-Y2O3-TiO2were synthesized by coprecipitation and rice starch was added as pore former in 10, 20 and 30 wt%. Powders were cold pressed as cylindrical pellets and sintered at 1500 °C for 01 hour and ceramics were characterized by techniques as Archimedes method for density measurements, X-ray diffraction and scanning electron microscopy. Results showed that pores are inhomogeneously distributed through ceramic bodies.

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