Abstract
Aim of the proposed research is the synthesis in air and argon of thermally densified glass-ceramics and foams from glass, based on metallurgical slag and industrial sand.The kinetics of densification is evaluated by hot stage microscopy (HSM) runs at different heating rates. The structures of foamed samples are observed with micro X-Ray computed tomography (μCT). Furthermore, the complex oxidation and reduction processes have been evaluated by electron paramagnetic resonance spectroscopy (EPR).The analysis of the sintering kinetics shows that in argon environment the densification temperature is lower, the activation energy of sintering decreases and the foaming trend is completely inhibited. On the contrary, during a traditional heat-treatment in air, the foaming tendency is intensive. Its rate increases with increasing temperature and samples with about 90 % vol. closed porosity can be obtained.However, if a preliminary oxidation step is performed, glass-ceramic foams can be synthesized also in inert atmosphere.
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