Temperature Dependence of Vickers Hardness for TeO2-Based and Soda-Lime Silicate Glasses.
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- WATANABE Toshio
- Nagaoka University of Technology
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- BENINO Yasuhiko
- Nagaoka University of Technology
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- ISHIZAKI Kozo
- Nagaoka University of Technology
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- KOMATSU Takayuki
- Nagaoka University of Technology
Bibliographic Information
- Other Title
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- テルライト系及びソーダ石灰ケイ酸塩ガラスのビッカース硬度の温度依存性
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Abstract
The temperature dependence of Vickers hardness (H) of TeO2-Based glasses such as 15Na2O⋅15ZnO⋅70TeO2 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 3GPa; (2) the temperature coefficient of the hardness, dH/dT, is around -4.5×10-3GPa·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 TeO2-Based glasses are fragile even from the point of view of mechanical properties. The reason for poor mechanical performance in TeO2-Based glasses is their weak bond strength and open atomic packing structures. The hardness (H=4.8GPa) of a transparent glass-ceramic (with nanocrystalline particles) of 15K2O⋅15Nb2O5⋅70TeO2 showing second harmonic generation is much larger than that of the precursor glass (H=3.3GPa), meaning that the improvement in the fragile character of TeO2-Based glasses is due to crystallization. A soda-lime silicate glass of 14Na2O⋅13CaO⋅73SiO2 has a value dH/dT=-6.5×10-3GPa·K-1, and in contrast to TeO2-Based glasses, its hardness decrease in the glass transition region is gradual, and a value H≈2GPa is obtained even at the glass transition temperature.
Journal
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- Journal of the Ceramic Society of Japan
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Journal of the Ceramic Society of Japan 107 (1252), 1140-1145, 1999
The Ceramic Society of Japan
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Details 詳細情報について
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- CRID
- 1390001205249572608
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- NII Article ID
- 110002289707
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- NII Book ID
- AN10040326
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- ISSN
- 18821022
- 09145400
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- NDL BIB ID
- 4929624
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed