The effect of additives on the crystallization and sintering of 2MgO-2Al2O3-5SiO2 glass-ceramics

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Abstract

Crystallization and sintering behaviour of three cordierite (2MgO-2Al2O3-5SiO2) glasses containing different amount of additives were investigated and compared by using differential thermal analysis (DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), and the Archimedes method. The stoichiometric 2MgO-2Al2O3-5SiO2 (MAS) glass and the 2MgO-2Al2O3-5SiO2 glass containing 3 wt% of B2O3 and 3 wt% of P2O5 (MASBP) showed two exotherms (one for μ-cordierite formation from a glass and the other for α-cordierite formation from the μ-cordierite phase), whereas the 2MgO-2Al2O3-5SiO2 glass containing 2 wt % of B2O3, 2 wt% of P2O5, and 2 wt % of TiO2 (MASBPT) showed only a single exotherm representing α-cordierite formation. By using Kissinger, Augis-Bennett, Ozawa, and modified Kissinger methods, the activation energy values for α-cordierite formation in the MASBP and MASBPT glasses were determined as 310 ± 6 and 326 ± 13 kJ mol-1, respectively, whereas that in the MAS glass was determined as 868 ± 5 kJ mol-1. The MASBPT glass showed the lowest peak temperature value for α-cordierite formation (980°C) amongst the three glasses. Both the MASBP and MASBPT glasses showed excellent sintering behaviour (> 99.7% of theoretical density).

Original languageEnglish
Pages (from-to)5421-5427
Number of pages7
JournalJournal of Materials Science
Volume31
Issue number20
DOIs
Publication statusPublished - 1996
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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