Inderscience Publishers

Strengthening of borosilicate glass by controlled crystallisation for lightweight bulletproof materials

0

For development of lightweight bulletproof glass window, TiO
2
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 × 10
10
mm
–3
hr
–1
at 600°C and the maximum crystal growth speed was 1.73 nm/min at 810°C. The maximum 3-point bending strength was 563 MPa when the crystal volume fraction and crystal size were 36.1%, 53.4 nm with number of crystals per unit volume of 4.525 × 10
10
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 736 kg/mm
2
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.

Keywords: crystallisation, borosilicate, nucleating agent, TiO 2, bulletproof

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