Crystallization kinetics phenomena assessment in aglass-ceramic material, by non-destructive spectroscopic methods

Type : Article de conférence
Auteur(s) :  D. Moudir, N. Kamel, Y. Mouheb, S. Kamariz, F. Aouchiche, A. Benmounah, A. Djeridi
Année :  2016
Domaine : Sciences des matériaux
Conférence: 7th African Conference on Non Destructive Testing (ACNDT) & the 5th International Conference on NDT and Materials Industry and Alloys (IC-WNDT-MI)
Lieu de la conférence:  Oran, Algeria
Résumé en PDF :  (résumé en pdf)
Fulltext en PDF :  (.pdf)
Mots clés :  glass-ceramic, alluminosilicate glass, FTIR, SEM, XRD

Résumé : 

Non destructive tests are very useful to follow crystallization kinetics phenomena during the synthesis of aluminosilicate glass-ceramic materials. These composite matrices are dedicated for nuclear waste storage. In this study,we assessed the crystallization kinetics dependence, by many non destructive tests, on the structure of an aluminosilicate glass ceramic ceramized by a nucleation crystallization treatment at 790°C during 2 h, and 900°C, for different periods of time ranging from 6 to 12 h. These tests are X-ray diffraction; scanning electron microscopy and Fourier transform Infra-redspectroscopy. For the whole of materials, Archimedes density is between 2530-2578 kg/m3. Both X-ray diffraction and scanning electronmicroscopy analyses reveal two main crystalline phases for the whole of heating treatments, namely spodumen and leucite. These phases grow regularly with the crystallization time. FTIR analysis shows Si-O-Si vibrations (680 cm-1and 457-467 cm), which shift toward lower values indicating Si-O-Me bonds formation (Me = metal), which are abundant for high ceramization times. The metals incorporated in the materials structure are well binded in the structure, conferring it durable properties. These non-destructive spectroscopic techniques allow following crystallization progress in the materials without altering the materials bulk, and are recommended for such studies.