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Preparation of foamed glasses from CRT TV glass by means of hydrothermal hot-pressing technique

2007; Elsevier BV; Volume: 28; Issue: 4 Linguagem: Inglês

10.1016/j.jeurceramsoc.2007.09.014

1873-619X

Z. Matamoros-Veloza, J.C. Rendón-Ángeles, Kazumichi Yanagisawa, M.A. Cisneros-Guerrero, M.M Cisneros-Guerrero, Luis E. Aguirre,

Recycling and utilization of industrial and municipal waste in materials production

The feasibility to prepare foamed glass specimens by using waste TV monitor (panel) glass as starting material under hydrothermal hot-pressing (HHP) conditions, followed by a conventional heating of the compact, was investigated. Hydrothermally hot pressed glass compacts were preliminarily prepared at a constant temperature of 200 °C, with a loading pressure of 20 MPa and two different water contents (5 and 10 wt%), for reaction intervals between 0.5 and 2 h, employing a glass particle size <38 μm. After the powder densification stage, firing of the compacted disk glass was conducted over a temperature range of 650–850 °C for 1 h. Microstructural observations conducted by SEM showed the formation of a new glass phase which incorporates water, this phase was formed during the glass densification stage at 200 °C for 2 h, with a water content of 10 wt%. The lowest apparent density achieved on these glass compacts heated at 700 °C for 1 h was 0.36 g/cm3. This value is similar to that of other foamed glasses that have close cell network and low thermal conductivity (0.0021 W/cm/°C).