2019 Fiscal Year Final Research Report
Physical and structural properties of hard and crack-resistant oxide glasses prepared by a levitation technique
| Project/Area Number |
17H03121
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic industrial materials
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| Research Institution | Hirosaki University |
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Principal Investigator |
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Keywords | 無容器法 / ビッカース硬度 / クラックレジスタンス |
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| Outline of Final Research Achievements |
Densely packed oxide glasses that are out of the conventional glass-forming rule were prepared by a levitation technique. Al2O3-Ta2O5-based and Al2O3-SiO2-based glasses exhibited superior mechanical properties such as large elastic modulus (Young's modulus was greater than 150 GPa). In the ternary system of MgO-SiO2-P2O5, the hardness of the MgO-rich glasses was much higher than those of conventional MgO-poor glasses. Structural analyses suggested that the local structures of these hard glasses were clearly different from those of conventional oxide glasses, and led to densely packed atomic arrangements.
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| Free Research Field |
固体化学
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| Academic Significance and Societal Importance of the Research Achievements |
無容器法を用いることで，従来ガラス化しないと思われていた組成域において，これまでのガラスの常識を超える機械的強度をもつ新たな材料，すなわち「本質的に」硬いガラス，割れないガラス，そして，硬くて割れないガラスを開発することに成功した．多角的な構造解析の結果から，これらのガラスの局所構造が従来のネットワークガラスとは大きく異なること，そしてそのことが充填密度を上げ，硬さと割れにくさの向上に寄与していることを明らかにした．硬くて割れないガラスの組成設計指針の確立に資する，構造と物性の相関に関する情報が得られた．
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