Mechanical and elastic properties of transparent nanocrystalline TeO2-based glass-ceramics

F. Torres, Y. Benino, T. Komatsu, C. Lavelle

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Mechanical and elastic properties of transparent TeO2-based glass-ceramics (15K2O · 15Nb2O5 · 70TeO2) consisting of nanocrystalline particles (each particle size: 40-50 nm) and showing optical second harmonic generation were evaluated by means of usual Vickers indentation and nanoindentation tests. The precursor glass has Vickers hardness Hv of 2.9 GPa, Young's modulus E of 54.7 GPa, the fracture toughness Kc of 0.25 MPam1/2 and Poisson's ratio of 0.24. The transparent nanocrystalline glass-ceramic heat-treated at 420°C for 1 h has Hv = 3.8 GPa, E = 75.9 GPa and Kc = 0.34 MPam1/2, and the opaque glass-ceramic heat-treated at 475°C for 1 h has Hv = 4.5 GPa, E = 82.9 GPa and Kc = 0.68 MPam1/2, demonstrating that poor mechanical and elastic properties of the precursor TeO2-based glass are improved through sufficient crystallization. The fracture surface energy, brittleness and elastic recoveries (about 44%) after unloading (the maximum load: 30 mN) of transparent nanocrystalline glass-ceramics are almost the same as those of the precursor glass, implying that the interaction among nanocrystalline particles is not so strong.

Original languageEnglish
Pages (from-to)4961-4967
Number of pages7
JournalJournal of Materials Science
Volume36
Issue number20
DOIs
Publication statusPublished - Oct 15 2001
Externally publishedYes

ASJC Scopus subject areas

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

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