TY - JOUR
T1 - Mechanical and elastic properties of transparent nanocrystalline TeO2-based glass-ceramics
AU - Torres, F.
AU - Benino, Y.
AU - Komatsu, T.
AU - Lavelle, C.
N1 - Funding Information:
This work was supported from the Grants of KAWASAKI STEEL 21st Century Foundation, the Ookura Kazuchika Memorial Foundation, and the Grant-in-Aid for Scientific Research from the Ministry of Education, Science, Sports and Culture, Japan. The authors thank Dr. Hidetoshi Saito, Nagaoka University of Technology, for the use of nanoindentation equipments.
PY - 2001/10/15
Y1 - 2001/10/15
N2 - 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.
AB - 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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U2 - 10.1023/A:1011808926424
DO - 10.1023/A:1011808926424
M3 - Article
AN - SCOPUS:0035888487
SN - 0022-2461
VL - 36
SP - 4961
EP - 4967
JO - Journal of Materials Science
JF - Journal of Materials Science
IS - 20
ER -