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

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

Research output: Contribution to journalArticle

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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

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Glass ceramics
Glass
Vickers hardness
Poisson ratio
Nanoindentation
Brittleness
Harmonic generation
Crystallization
Unloading
Indentation
Interfacial energy
Fracture toughness
Elastic moduli
Particle size
Recovery
Hot Temperature

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Mechanical and elastic properties of transparent nanocrystalline TeO2-based glass-ceramics. / Torres, F.; Benino, Yasuhiko; Komatsu, T.; Lavelle, C.

In: Journal of Materials Science, Vol. 36, No. 20, 15.10.2001, p. 4961-4967.

Research output: Contribution to journalArticle

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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.",
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