Approach of phase transformations and densification in nanostructured and (Bi2O3, ZnO,TiO2) doped silica ceramics

L. Nguyen (1) , Alexandre Maitre (1) , Martine Lejeune (1) , C. Dossou-Yovo (2) , R. Noguera (2) , Renaud Podor (3)

1 Axe 1 : procédés céramiques
2 CERADROP - CERADROP
3 ICSM - UMR 5257 - Institut de Chimie Séparative de Marcoule

The lowtemperaturesinteringofsilicaisstudiedundertheinfluenceofsinteringaidsandnanosizedpowdersusingX-Ray Diffractometry (XRD)andhigh-temperatureenvironmentalscanningelectronmicroscopyanalyses(HT-ESEM).Twoparticularaids were chosentoconductthisstudy,[Bi2O3-ZnO]eutectic and titania.Wereportaloweringofthecrystallizationtemperaturewhenthe former compoundisintroducedinthesilicawhilearaiseisobservedwhenthelatterisused.Moreover,theamorphoussilica crystallization intocristobaliteinhibitsdrasticallythekineticsofdensificationofsilica-basedmaterials.

Mots clés: Sintering; ElectronMicroscopy; Microstructure-final; SiO2

L. Nguyen, Alexandre Maitre, Martine Lejeune, C. Dossou-Yovo, R. Noguera, et al.. Approach of phase transformations and densification in nanostructured and (Bi2O3, ZnO,TiO2) doped silica ceramics. Ceramics International, 2013, 39, pp.6087-6098. ⟨10.1016/j.ceramint.2013.01.026⟩. ⟨hal-00908833⟩