Temperature dependence of vickers hardness for TeO 2-based and soda-lime silicate glasses

Toshio Watanabe, Yasuhiko Benino, Kozo Ishizaki, Takayuki Komatsu

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The temperature dependence of Vickers hardness (H) of TeO 2-based glasses such as 15Na 2O · 15ZnO · 70TeO 2 as host glasses for rare-earth doped optical amplifier was measured from room temperature to the glass transition region. The following features were found; (1) crack formation under the indenter easily occurs, the Vickers hardness at room temperature being around 3 GPa; (2) the temperature coefficient of the hardness, dH/dT, is around -4.5 × 10 -3 GPa · K -1; (3) the relative change of hardness with temperature is closely related to thermal expansion coefficient, and hardness sharply decreases in the glass transition region. It was demonstrated that TeO 2-based glasses are fragile even from the point of view of mechanical properties. The reason for poor mechanical performance in TeO 2-based glasses is their weak bond strength and open atomic packing structures. The hardness (H=4.8 GPa) of a transparent glass-ceramic (with nano-crystalline particles) of 15K 2O · 15Nb 2O 5 · 70TeO 2 showing second harmonic generation is much larger than that of the precursor glass (H=3.3 GPa), meaning that the improvement in the fragile character of TeO 2-based glasses is due to crystallization. A soda-lime silicate glass of 14Na 2O · 13CaO · 73SiO 2 has a value dH/dT= -6.5 × 10 -3 GPa · K -1, and in contrast to TeO 2-based glasses, its hardness decrease in the glass transition region is gradual, and a value H ≈ 2 GPa is obtained even at the glass transition temperature.

Original languageEnglish
Pages (from-to)1140-1145
Number of pages6
JournalNippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
Volume107
Issue number12
Publication statusPublished - 1999
Externally publishedYes

Fingerprint

Silicates
Vickers hardness
calcium oxides
Lime
silicates
Glass
temperature dependence
glass
Hardness
hardness
Glass transition
Temperature
Light amplifiers
soda lime
Glass ceramics
Harmonic generation
Crystallization
Crack initiation
Rare earths
Thermal expansion

Keywords

  • Fragile
  • Glass-ceramics
  • Hardness
  • Tellurtie glasses
  • Temperature dependence

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Temperature dependence of vickers hardness for TeO 2-based and soda-lime silicate glasses. / Watanabe, Toshio; Benino, Yasuhiko; Ishizaki, Kozo; Komatsu, Takayuki.

In: Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan, Vol. 107, No. 12, 1999, p. 1140-1145.

Research output: Contribution to journalArticle

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abstract = "The temperature dependence of Vickers hardness (H) of TeO 2-based glasses such as 15Na 2O · 15ZnO · 70TeO 2 as host glasses for rare-earth doped optical amplifier was measured from room temperature to the glass transition region. The following features were found; (1) crack formation under the indenter easily occurs, the Vickers hardness at room temperature being around 3 GPa; (2) the temperature coefficient of the hardness, dH/dT, is around -4.5 × 10 -3 GPa · K -1; (3) the relative change of hardness with temperature is closely related to thermal expansion coefficient, and hardness sharply decreases in the glass transition region. It was demonstrated that TeO 2-based glasses are fragile even from the point of view of mechanical properties. The reason for poor mechanical performance in TeO 2-based glasses is their weak bond strength and open atomic packing structures. The hardness (H=4.8 GPa) of a transparent glass-ceramic (with nano-crystalline particles) of 15K 2O · 15Nb 2O 5 · 70TeO 2 showing second harmonic generation is much larger than that of the precursor glass (H=3.3 GPa), meaning that the improvement in the fragile character of TeO 2-based glasses is due to crystallization. A soda-lime silicate glass of 14Na 2O · 13CaO · 73SiO 2 has a value dH/dT= -6.5 × 10 -3 GPa · K -1, and in contrast to TeO 2-based glasses, its hardness decrease in the glass transition region is gradual, and a value H ≈ 2 GPa is obtained even at the glass transition temperature.",
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N2 - The temperature dependence of Vickers hardness (H) of TeO 2-based glasses such as 15Na 2O · 15ZnO · 70TeO 2 as host glasses for rare-earth doped optical amplifier was measured from room temperature to the glass transition region. The following features were found; (1) crack formation under the indenter easily occurs, the Vickers hardness at room temperature being around 3 GPa; (2) the temperature coefficient of the hardness, dH/dT, is around -4.5 × 10 -3 GPa · K -1; (3) the relative change of hardness with temperature is closely related to thermal expansion coefficient, and hardness sharply decreases in the glass transition region. It was demonstrated that TeO 2-based glasses are fragile even from the point of view of mechanical properties. The reason for poor mechanical performance in TeO 2-based glasses is their weak bond strength and open atomic packing structures. The hardness (H=4.8 GPa) of a transparent glass-ceramic (with nano-crystalline particles) of 15K 2O · 15Nb 2O 5 · 70TeO 2 showing second harmonic generation is much larger than that of the precursor glass (H=3.3 GPa), meaning that the improvement in the fragile character of TeO 2-based glasses is due to crystallization. A soda-lime silicate glass of 14Na 2O · 13CaO · 73SiO 2 has a value dH/dT= -6.5 × 10 -3 GPa · K -1, and in contrast to TeO 2-based glasses, its hardness decrease in the glass transition region is gradual, and a value H ≈ 2 GPa is obtained even at the glass transition temperature.

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