Influence of TiO 2 content on the crystallization and microstructure of machinable glass-ceramics

Glasses based on the SiO 2 –Al 2 O 3 –MgO–K 2 O–B 2 O 3 –MgF 2  system added with TiO 2 were synthesized and characterized by differential scanning calorimetry (DSC), X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) techniques. The...

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Bibliographic Details
Published inJournal of Asian Ceramic Societies Vol. 4; no. 1; pp. 55 - 60
Main Authors Mukherjee, Debasis Pradip, Das, Sudip Kumar
Format Journal Article
LanguageEnglish
Published 01.03.2016
Subjects
Glass ceramics
Glass Technology
Glasteknologi
Hardness
Machinability
Microstructure-final
TiO2
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Summary:Glasses based on the SiO 2 –Al 2 O 3 –MgO–K 2 O–B 2 O 3 –MgF 2  system added with TiO 2 were synthesized and characterized by differential scanning calorimetry (DSC), X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) techniques. The results showed that by increasing the TiO 2 content, glass transition temperature ( T g ), both the crystallization peak temperature ( T p I and  T p II ) and activation energy ( E ) increased. The interconnected large blocky card-like crystals were identified as fluorophlogopite as a major crystalline phase for all three glass-ceramic specimens by (XRD) and subsequently confirmed by SEM. The Vickers hardness ( H v ) value for glass-ceramic specimens decreases with progressively increasing TiO 2  content (1–10 wt%) and Titania containing MGT-3 glass-ceramic specimen with interconnected large blocky card-like fluorophlogopite mica crystals possess lower  H v  (4.26 GPa) as well as good machinability ( m  = 0.12) useable for machinable applications. The study shows that Titania promoted initial crystallization of glass and can be used as an effective nucleting agent.
ISSN:2187-0764
2187-0764
DOI:10.1016/j.jascer.2015.11.004