scholarly journals Preparation and properties of CaO-Al2O3-SiO2 glass-ceramics by sintered frits particle from mining wastes

2014 ◽  
Vol 46 (3) ◽  
pp. 353-363 ◽  
Author(s):  
F. He ◽  
Y. Zheng ◽  
J. Xie
Keyword(s):  
Chemical Resistance ◽  
Glass Ceramics ◽  
Xrd Analysis ◽  
Mining Wastes ◽  
X Ray Diffraction ◽  
X Ray ◽  
Main Crystalline Phase ◽  
Fine Microstructure ◽  
Produce Glass ◽  
Gold Tailings

The paper reports on some experimental results obtained from the production of glass-ceramics containing gold tailings powder (GTP). Frits particle sintered technology was used to prepare glass ceramic products. SiO2, CaO, ZnO, BaO and B2O3 were selected to adjust the composition of the glass. Based on the results of differential thermal analysis (DTA), the nucleation and crystallization temperature of parent glass samples with different schedule were identified, respectively. X-ray diffraction (XRD) analysis of the produced glass-ceramics materials revealed that the main crystalline phase was ?-wollastonite. With the increasing of CaO content, the intensity of crystal diffractive peaks also increases. The formation of ?-wollastonite crystal could be accelerated by the increasing of CaO. The glass-ceramics with fine microstructure showed better physical, mechanical properties and chemical resistance. Overall results indicated that it was a feasible attempt to produce glass-ceramics for building and decorative materials from waste materials. The amount of GTP used in the glass batches was more than 65 wt% of the whole raw.

Investigation of Nucleation and Crystallization Behavior of Li2O-MgO-Al2O3-SiO2-MgF2 Glass-Ceramics System

2014 ◽  
Vol 1044-1045 ◽  
pp. 63-66 ◽  
Author(s):  
Zheng Cao ◽  
Xiu Quan Zhao ◽  
Hong Jiang ◽  
Chang Jiu Li ◽  
Yang Shen ◽  
...  
Keyword(s):  
Glass Ceramics ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Base Glass ◽  
X Ray ◽  
Appropriate Treatment ◽  
Activation Energy Of Crystallization ◽  
Main Crystalline Phase ◽  
Alumino Silicate ◽  
Sem Morphology

The glass-ceramics were produced via heat treatment from bulk base glass at the appropriate treatment temperatures provided by the differential thermal analysis (DTA) measurement. The effect of nucleation on crystallization kinetics has been explored. It is found that nucleation indeed decreased the activation energy of crystallization. X-ray diffraction (XRD) analysis demonstrated that the main crystalline phase was magnesium alumino-silicate (MgAl2Si3O10), Scanning electron microscopy (SEM) morphology showed that the crystals were needle-like in all the samples.

Effects of Different Content of TiO2 on Crystallization Behavior and Properties of Li2O-ZnO-SiO2 Glass-Ceramics

2014 ◽  
Vol 1035 ◽  
pp. 263-267
Author(s):  
Xiu Quan Zhao ◽  
Zheng Cao ◽  
Yu Teng Wu ◽  
Hong Jiang ◽  
Chang Jiu Li ◽  
...  
Keyword(s):  
Crystallization Behavior ◽  
Glass Ceramics ◽  
Ceramic Materials ◽  
Xrd Analysis ◽  
Spherical Particles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Glass Ceramic Materials ◽  
Average Coefficient ◽  
Different Content

Glass-ceramic materials of the Li2O-ZnO-SiO2 system, with various amounts of TiO2 added, have been prepared. The appropriate heat treatment temperatures were selected according to the information provided by the differential thermal analysis (DTA). X-ray diffraction (XRD) analysis demonstrated that in the LZS glass-ceramics system, the main phases are Li2ZnSiO4, cristobalite, tridymite and quartz. The scanning electron microscopy (SEM) revealed that crystals appear as lamellar and spherical particles in the glass-ceramics samples. In addition, the average coefficient of the thermal expansion (CTE) values first decreased, then increased and finally tended to flatten. When the content of TiO2 increased to 6%, the CTE value decreased to 9.15×10-6/K, reached the lowest value. When the content of TiO2 increased to 10%, the CTE value reached highest value 13.90×10-6/K.

Preparation and Microstructure of Bauxite Ceramic Microsphere

2007 ◽  
Vol 336-338 ◽  
pp. 1124-1126
Author(s):  
Xiao Su Cheng ◽  
Ling Ke Zeng ◽  
Xiu Yan Li ◽  
Wen Yan Sheng ◽  
An Ze Shui ◽  
...  
Keyword(s):  
Raw Materials ◽  
Xrd Analysis ◽  
Al2o3 Content ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
Main Crystalline Phase ◽  
Ceramic Microsphere ◽  
Α Al2o3 ◽  
Chinese Bauxite

In this paper, microspheres were prepared by using Chinese bauxite as raw materials through centrifugal spray drying method. The microstructure and composition of ceramic microsphere were investigated by X-ray diffraction, scanning electron microscope and X-ray energy spectrum. The particle size was 10~100#m. The XRD analysis reveals that the main crystalline phase of the ceramic microsphere were α-Al2O3 and mullite (3Al2O3•2SiO2). The Al2O3 content (chemical composition) of the microspheres was little more than 70%, and the molar ratio of Al2O3/SiO2 was near to the molar ratio of alumina and silica of mullite.

Effect of CaO/SiO2 Ratio and TiO2 on Glass-Ceramics Made from Steel Slag and Fly Ash

2012 ◽  
Vol 217-219 ◽  
pp. 119-123 ◽  
Author(s):  
Bao Wei Li ◽  
Hua Chen ◽  
Ming Zhao ◽  
Xue Feng Zhang ◽  
Yong Sheng Du ◽  
...  
Keyword(s):  
Fly Ash ◽  
Bending Strength ◽  
Steel Slag ◽  
Glass Ceramics ◽  
Nucleating Agent ◽  
Spherical Particles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Main Crystalline Phase ◽  
Average Size

Glass ceramics of the CaO-MgO-Al2O3-SiO2 system were fabricated by adopting the melting-casting procedure. Steel slag and fly ash were used as the major starting materials. The influence of CaO/SiO2 Ratio variations on the microstructure and mechanical properties were investigated using X-ray diffraction, scanning electron microscopy and property measurements. Augite is identified as the main crystalline phase of the as studied glass ceramics. The average size of augite grains in form of spherical particles is found within the range of 100-250nm. The bending strength of the glass-ceramics could reach as high as 170.74MPa. Increasing CaO/SiO2 show a beneficial influence on the crystallization of glass ceramics, and its effectiveness is inferior compared with that of increasing addition of nucleating agent, TiO2.

scholarly journals Study of the effect of Ca/Mg alkali-oxides ratio on the structure of a glass-ceramic based on an aluminosilicated glass containing 2wt.% of zirconolite crystalline phase

2014 ◽  
Vol 46 (3) ◽  
pp. 377-383
Author(s):  
R. Souag ◽  
N. Kamel ◽  
Y. Mouheb ◽  
M. Hammadi ◽  
Z. Kamel ◽  
...  
Keyword(s):  
Glass Ceramic ◽  
Glass Ceramics ◽  
Xrd Analysis ◽  
Aluminosilicate Glass ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electron Microscopy Analysis ◽  
Microscopy Analysis ◽  
Alkali Oxides ◽  
Scanning Electron

New nuclear glass-ceramics are extensively studied for the radioactive waste confinement, due to the double confinement conferred by the glass-ceramics. In this study, a glass-ceramic constituted by an aluminosilicate glass in the system: SiO2-Al2O3-CaO-MgOZrO2-TiO2, containing 2wt.% of Ca0.83Ce0.17ZrTi1.66Al0.34O7 zirconolite, has been synthesized by the discontinuous method. Cerium, an actinide surrogate is introduced both in the glass and ceramic phases. The synthesis is performed by a double melting at 1350?C, followed by a nucleation at 564?C, during 2 h, and a crystal growth at 1010?C during 3 h. Then effect of Ca/Mg ratio on the distribution of the crystalline network in the material was studied for Ca / Mg ratios ranging from 0.4 to 5.5. For the whole of the materials, Archimedes density is about 2.80 g/cm3. X-ray diffraction (XRD) analysis shows that the increase of Ca/Mg ratio leads to the increase of aluminosilicated crystalline phases with high Ca contents; the materials molar volumes remaining constant. The zirconolite phase is not affected by these additive aluminosilicated phases. The scanning electron microscopy analysis (SEM) coupled with energy dispersive X-ray (EDX) analysis confirmed these results; and shows the uniformity of distribution of the ceramics in the bulk of the materials.

The Effect of Fluorine on the Viscosity and Crystallization of Lithium Aluminosilicate Glasses

2012 ◽  
Vol 509 ◽  
pp. 346-352
Author(s):  
Wei Hong Zheng ◽  
Yang Dai ◽  
Mo Zhou Lin ◽  
Kun Yang ◽  
Hao Wu
Keyword(s):  
Melting Temperature ◽  
Glass Ceramics ◽  
Fluorine Content ◽  
X Ray Diffraction ◽  
Lithium Aluminosilicate ◽  
X Ray ◽  
Melting Temperatures ◽  
Aluminosilicate Glasses ◽  
Main Crystalline Phase ◽  
Rotation Viscometer

Lithium aluminosilicate glasses have high viscosities, resulting in high melting temperatures and processing temperatures. In this study, F was added to the LAS glasses to reduce the melting temperature and viscosity for float process. The effects of fluorine content on the viscosity and crystallization of the parent glasses were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), differential thermal analysis (DTA) and rotation viscometer. It was found that the addition of F was useful in reducing the melting temperature and viscosity. The main crystalline phase of resulting glass-ceramics was β-spodumene. The activation energy (E) of LAS glasses was decreased from 460.3 KJ/mol to 417.7 KJ/mol with the addition of 2.63 wt% F, which accelerated the crystallization and enhanced the crystallinity of specimens.

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

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%.

In-Vitro Bioactivity Characterization of Sodium-Potassium Mica and Fluorapatite Containing Glass Ceramics

2007 ◽  
Vol 330-332 ◽  
pp. 185-188
Author(s):  
Gultekin Goller ◽  
Can Cekli ◽  
Ipek Akin ◽  
Erdem Demirkesen
Keyword(s):  
Glass Ceramics ◽  
Xrd Analysis ◽  
In Vitro Bioactivity ◽  
X Ray Diffraction ◽  
Sodium Potassium ◽  
X Ray ◽  
Ftir Technique ◽  
Molecular Bonding

The aim of this study is to find out the crystallization behaviour and in-vitro bioactivity character of machinable glass ceramics having different ratios of Na/K mica and apatite phases, to ascertain the best machinable composition. In order to investigate the bioactivity behavior of the samples the simulated body fluid (SBF) was prepared. Samples were removed from the solution after 1 hour, 1 day, 1, 2, 3 and 4 weeks. FEG-SEM was used to characterize the morphology of precipitation HCA layer on the surface depending on time. Molecular bonding characterization of HCA layers were carried out by using Fourier Transform Infrared Spectroscopy (FTIR) technique. The thin film X-ray diffraction (TF-XRD) analysis was used to characterize the variation of chemical composition on precipitated layer by time. Optimum results were obtained by the composition, containing 70wt% Na/K mica and 30wt% fluorapatite which had an average mica size of 3-4 microns.

Effects of Glass Components Ratio on Structure and Properties of Baiyunebo Tailing Glass-Ceramics

2013 ◽  
Vol 743-744 ◽  
pp. 720-724
Author(s):  
Yong Sheng Du ◽  
Bao Wei Li ◽  
Xue Feng Zhang
Keyword(s):  
Glass Ceramic ◽  
Raw Materials ◽  
Glass Melting ◽  
Glass Ceramics ◽  
Structure And Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mechanical Measurements ◽  
Main Crystalline Phase ◽  
Annealing Heat Treatment

Glass-ceramic in the CaO-MgO-Al2O3-SiO2 quaternary system was prepared using Baiyunebo tailing and fly ash as main raw materials by the method of melting. The processes of producing glass-ceramic included mixture, melting, molding, annealing, heat treatment, etc. The processing schedule for glass melting temperature, nucleation and crystallization temperature were chosen as 1450°C, 720°C and 850°C. The influences of glass components ratio on the structure were investigated by X-ray diffraction (XRD). It can be found that the main crystalline phase of augite, anorthite, magnesioferrite or magnetite mainly depended on glass components ratio. The results of mechanical measurements indicated that the bending strengths, density and chemical durability of glass-ceramics were concerned with the main crystal phase. The glass ceramics with augite phase had higher performance compared with others.

scholarly journals Corrosion mechanism and bioactivity of borate glasses analogue to Hench’s bioglass

2012 ◽  
Vol 6 (3) ◽  
pp. 141-149 ◽  
Author(s):  
Mona Ouis ◽  
Amr Abdelghany ◽  
Hatem Elbatal
Keyword(s):  
Ftir Spectroscopy ◽  
Glass Ceramics ◽  
Xrd Analysis ◽  
Corrosion Mechanism ◽  
Phosphate Solution ◽  
Borate Glasses ◽  
Scaffold Material ◽  
X Ray Diffraction ◽  
X Ray ◽  
New Class

Bioactive borate glasses (from the system Na2O-CaO-B2O3-P2O5) and corresponding glass-ceramics as a new class of scaffold material were prepared by full replacement of SiO2 with B2O3 in Hench patented bioactive glass. The prepared samples were investigated by differential thermal analysis (DTA), Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD) analysis. The DTA data were used to find out the proper heat treatment temperatures for preparation of the appropriate glass-ceramics with high crystallinity. The prepared crystalline glass-ceramics derivatives were examined by XRD to identify the crystalline phases that were precipitated during controlled thermal treatment. The FTIR spectroscopy was used to justify the formation of hydroxyapatite as an indication of the bioactivity potential or activity of the studied ternary borate glasses or corresponding glass-ceramics after immersion in aqueous phosphate solution. The corrosion results are interpreted on the basis of suggested recent views on the corrosion mechanism of such modified borate glasses in relation to their composition and constitution.

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