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Matamoros-Veloza Z.,Technological Institute of Saltillo | Rendon-Angeles J.C.,Research Institute for Advanced Studies of the NPI | Rendon-Angeles J.C.,Research Institute for Advanced Studies of the NPI | Yanagisawa K.,Kochi University | And 2 more authors.
Ceramics International | Year: 2015

The influence of aqueous solutions (deionized water or Na2CO3 solutions, 0.1-0.5 M) and other processing parameters such as temperature (150-250 °C) for preparing hydrothermal hot-pressed TV panel waste glass compacts was investigated to produce porous glass specimens. Waste powdered glass (5 g) from old analog Philips television panels (Mexico) with particle sizes of <38 μm was mixed with various amounts of the selected aqueous solution (5-20 wt%). The TV glass panel particles dissolved in all of the mineralizer solution that were employed, and the behavior was controlled by the amount of aqueous solution added to the glass powder densification stage. The reactions of the glass particles with water or Na2CO3 solutions produced a solid glass phase that included water molecules or Na+ and CO3-2 ions, respectively. The hydrothermal hot press (HHP)-treated glass compacts prepared at 200 °C for 2 h at a constant loading pressure of 20 MPa exhibited a marked expansion after heat treatment conducted at 700 °C for 1 h in an air atmosphere. The expansion of the HHP compacted TV panel glass specimens was further increased for the samples prepared with 0.5 M Na2CO3 solution; these foamed glasses exhibited the lowest apparent densities that varied from 0.309 to 0.319 g/cm3. © 2015 Elsevier Ltd and Techna Group S.r.l. Source


Matamoros-Veloza Z.,Technological Institute of Saltillo | Rendon-Angeles J.C.,Research Institute for Advanced Studies of the NPI | Yanagisawa K.,Kochi University | Mejia-Martinez E.E.,Technological Institute of Saltillo | Parga J.R.,Technological Institute of Saltillo
Ceramics International | Year: 2015

The influence of aqueous solutions (deionized water or Na2CO3 solutions, 0.1-0.5M) and other processing parameters such as temperature (150-250°C) for preparing hydrothermal hot-pressed TV panel waste glass compacts was investigated to produce porous glass specimens. Waste powdered glass (5g) from old analog Philips television panels (Mexico) with particle sizes of <38μm was mixed with various amounts of the selected aqueous solution (5-20wt%). The TV glass panel particles dissolved in all of the mineralizer solution that were employed, and the behavior was controlled by the amount of aqueous solution added to the glass powder densification stage. The reactions of the glass particles with water or Na2CO3 solutions produced a solid glass phase that included water molecules or Na+ and CO3-2 ions, respectively. The hydrothermal hot press (HHP)-treated glass compacts prepared at 200°C for 2h at a constant loading pressure of 20MPa exhibited a marked expansion after heat treatment conducted at 700°C for 1h in an air atmosphere. The expansion of the HHP compacted TV panel glass specimens was further increased for the samples prepared with 0.5M Na2CO3 solution; these foamed glasses exhibited the lowest apparent densities that varied from 0.309 to 0.319g/cm3. © 2015 Elsevier Ltd and Techna Group S.r.l. Source


Rendon-Angeles J.C.,Research Institute for Advanced Studies of the NPI | Rendon-Angeles J.C.,Kochi University | Yanagisawa K.,Kochi University | Matamoros-Veloza Z.,Saltillo Institute of Technology | And 3 more authors.
Journal of Alloys and Compounds | Year: 2010

Sr doped lanthanum chromite powders with two different compositions, La0.9Sr0.1CrO3 and La0.8Sr 0.2CrO3, were prepared from precursor lanthanum chromite gels obtained by the coprecipitation method, followed by hydrothermal treatments at temperatures from 400 to 450 °C, for various reaction times varying from 0.5 to 2 h. The reaction products were characterized by XRD, SEM and TEM techniques. The powder was cold isostatically pressed at 200 MPa, and then sintered in air at 1500 °C for several intervals (1-20 h). Relative density measurements were conducted by helium pycnometry and the microstructure was revealed by SEM after thermal etching. The X-ray diffraction patterns of the powders corresponding to La0.9Sr0.1CrO3 and La0.8Sr0.2CrO3 nominal compositions obtained at 400 and 425 °C for 1 h, respectively, were indexed with that of the orthorhombic single LaCrO3 phase. SEM and TEM micrographs showed that the particles had irregular peanut-like morphology, and the average particle size was 300 nm. Furthermore, the maximum relative density of the La 0.8Sr0.2CrO3 sample obtained by the heat treatment in air at 1500 °C for 20 h was 97% of the theoretical density and the average grain size of the sintered pellet was of 5 μm. The electric conductivity and activation energy determined for this pellet were 14477.3 S m-1 and 0.13 eV, respectively. © 2010 Elsevier B.V. All rights reserved. Source

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