Strengthening of borosilicate glass by controlled crystallisation for lightweight bulletproof materials
by Gyu-In Shim; Cheol-Young Kim; Se-Young Choi
International Journal of Nanotechnology (IJNT), Vol. 10, No. 8/9, 2013

Abstract: For development of lightweight bulletproof glass window, TiO₂ added as a nucleating agent to borosilicate glass was crystallised by 2-step heat-treatment. The glass transition temperature (T_g) and crystallisation temperature (T_c) were 595°C, 810°C, respectively. The maximum nucleation rate was 7.3 × 10¹⁰ mm⁻³ hr⁻¹ at 600°C and the maximum crystal growth speed was 1.73nm/min at 810°C. The maximum 3-point bending strength was 563 MPa when the crystal volume fraction and crystal size were 36.1%, 53.4nm with number of crystals per unit volume of 4.525 × 10¹⁰ mm⁻³ at 600°C for 1 hr, 810°C for 30 min. The Vickers' hardness and fracture toughness of same crystal volume fraction were 736kg/mm² and 1.0779 MPa m^1/2 which were about 220%, 17%, 44% higher than borosilicate glass. Thus, the bulletproof materials were replaced by crystallised borosilicate glass, which can be expected to be thinner and lightweight.

Online publication date: Thu, 01-Aug-2013

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