| Development of Thin and Lightweight Bulletproof Windows Using Strengthened SLS Glass by Ion Exchange |
| Gyu-In Shim, Seong-Hwan Kim, Deok-Lae Ahn, Jong-Kyoo Park1, Se-Young Choi |
Department of Materials Science and Engineering, Yonsei University
1The Fourth Research and Development, Agency for Defense Development |
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| ABSTRACT |
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Soda-lime silicate (SLS) glass was strengthened by ion exchange for application of thin and lightweight bulletproof windows. The optimal conditions for ion exchanged SLS glass (thickness of 3 and 10 mm) at $480^{circ}C$ were 10 and 17 min, respectively. The Vickers hardness values of the strengthened SLS glass samples with thicknesses of 3 and 10 mm were $5.9{pm}0.22$ and $6.7{pm}0.17GPa$, respectively, which values were about 22% higher than those of parent SLS glass. By laminating a multilayer defense film and polycarbonate sheet with ion exchanged SLS glass, we were able to make a thin and lightweight bulletproof window (24.25 mm, 4.57 kg, $50.06kg/m^2$, $V_{50}$ 901.8 m/s). As a result, the thickness of the bulletproof window was decreased by about 39% from 40 to 24.25 mm. The light transmittance in the visible range satisfied the standard (over 76%) for bulletproof windows. |
| Key words:
Soda-lime silicate glass, Ion exchange, Bulletproof window, Ballistic limit velocity, Transmittance |
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