| Crystallization of Borosilicate Glass with the Addition of $ZrO_2$ |
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Gyu-In Shim, Young-Hwan Kim, Jae-Min Lim, Se-Young Choi |
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Yonsei University |
| 지르코니아 첨가된 보로실리케이트 유리의 결정화 |
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심규인, 김영환, 임재민, 최세영 |
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연세대학교 |
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| Abstract |
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Borosilicate glass was prepared in the composition of 81% $SiO_2$, 4% $Na_2O$, 2% $Al_2O_3$, 13% $B_2O_3$. The albite phase($NaAlSi_3O_8$) increased with the $ZrO_2$(0~10wt.%) addition. For measurement of glass transition temperature($T_g$), crystallization temperature($T_{c,max}$) measured by differential thermal analysis. The $T_g$ and $T_{c,max}$ were $510{sim}530^{circ}C$ $650{sim}670^{circ}C$, respectively. The crystallized glass was heated at various conditions(temperature, time). After nucleation at $550^{circ}C$ for 2hours prior to crystal growth at $650^{circ}C$ for 4hours, the resulting Vickers hardness, fracture toughness and bending strength were about $736H_v$, $1.0779MPa{cdot}m^{1/2}$, and 493MPa, which were 17%, 45% and 149% higher than parent borosilicate glass, respectively. Crystal size and transmittance of crystallized borosilicate glass were analyzed by FE-SEM, EDX and UV-VIS-NIR spectrophotometer. Transmittance of crystallized borosilicate glass was decreased with increasing $ZrO_2$(wt%) at visible-range. The results prove that light-weight bulletproof can be fabricated by the crystallization of borosilicate glass. |
| Key Words:
Borosilicate Glass, Crystallization, Nucleation, Crystal Growth |
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