română MIHAI EFTIMIE, IOANA ŢACU
Abstract
Our experiments on the recovery of the glass waste resulted from cathode ray tubes - CRT were focused to designing compositions of glass-ceramic from glass waste with possible applications in composite materials. The recipes were calculated using as much waste as possible, using various nucleating agents and varying percentages, showing in this study the influence of ZrO2. The report of CRT glass used for the neck:funnel:panel components were 5:30:65%, identical to the ones in CRT. We determined the following physical and mechanical properties: density, porosity, absorption, thermal expansion, hydrolytic stability. In order to characterize in terms of compositional and microstructural, the analyses were carried out by X-ray diffraction and scanning electron microscopy measurements, showing the influence of the nucleating agent and thermal treatment temperature on the properties of the glass ceramics.
Keywords
glass-ceramics, cathode ray tubes, waste, composites
IRINA FIERĂSCU, RADU CLAUDIU FIERĂSCU, RODICA MARIANA ION, CONSTANTIN RADOVICI
Abstract
Most of the artefacts of cultural and / or historical value are exposed to fungal attack often causing irreversible damage. The need for new methods of antifungal protection led to the development of a recipe based on hydroxyapatite and barium hydroxide, with promising results. We synthesized and analytical characterized (trough energy dispersive X-ray fluorescence, X-ray diffraction and Fourier transform infrared spectroscopy) several materials based on hydroxyapatite. The efficiency of the synthesized materials was evaluated by diluted inoculums on the culture media technique and a modified Kirby-Bauer method, using simulated artefacts, previously reported to replicate the real artefacts.
Keywords
artefacts, biodeterioration, hydroxyapatite, X-ray methods
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Year
2014
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Issue
44 (3)
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Pages
292-297
LUMINIŢA DANIELA URSU, ILEANA CRISTINA VASILIU, IONUŢ FERARU, LUCICA BOROICA, BOGDAN ALEXANDRU SAVA
Abstract
Present paper presents a study of the colorful glasses in the SiO2-Na2O-B2O3-K2O-ZnO system, to which there were added the borosilicate glass waste and copper oxide or nickel oxide from the sludge obtained from the electrochemical deposition industry. The use of borosilicate waste glass (that comes up with important components such as B2O3, CaO, Al2O3), leads to saving of raw materials and energy while being sustainable at the same time. Structural studies of the obtained vitreous materials were made, using FTIR and Raman spectroscopy. FTIR absorption maxima and Raman shifts were identified and discussed according to literature data.
Keywords
decorative glass, borosilicate cullet, copper containing sludge, nickel wastes, ftir, raman spectroscopy