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Development of Thin and Lightweight Bulletproof Windows Using Strengthened SLS Glass by Ion Exchange

  • Shim, Gyu-In (Department of Materials Science and Engineering, Yonsei University) ;
  • Kim, Seong-Hwan (Department of Materials Science and Engineering, Yonsei University) ;
  • Ahn, Deok-Lae (Department of Materials Science and Engineering, Yonsei University) ;
  • Park, Jong-Kyoo (The Fourth Research and Development, Agency for Defense Development) ;
  • Choi, Se-Young (Department of Materials Science and Engineering, Yonsei University)
  • Received : 2015.01.19
  • Accepted : 2015.02.24
  • Published : 2015.03.31

Abstract

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.

Keywords

Soda-lime silicate glass;Ion exchange;Bulletproof window;Ballistic limit velocity;Transmittance

Acknowledgement

Supported by : Defense Nano Technology Application Center (DNTAC)

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