Mechanical properties of transparent glass-ceramics for ballistic armours

Reference Presenter Authors
(Institution)
Abstract
11-020 Débora Cristina Niero Fabris Fabris, D.C.(Federal University of São Carlos (UFSCar)); Villas Boas, M.d.(Federal University of São Carlos (UFSCar)); Zanotto, E.D.(Federal University of São Carlos (UFSCar)); Transparent ceramic armours have been increasingly used in security glass windows, helmet visors and vehicles. Traditional materials for civilian applications are laminated borosilicate and soda-lime-silica glasses. In military equipment, that requires higher performance, sapphire, aluminum oxynitride (ALON) and polycrystalline magnesium aluminate transparent ceramics have been successfully applied. Transparent glass-ceramics can replace these materials in certain applications for a number of reasons. Glass-ceramics have much better performance than borosilicate and soda-lime glasses and are much easier to produce, especially large parts, than transparent ceramics. Lithium disilicate (LS2), lithium aluminium silicate (LAS), and magnesium aluminium silicate (MAS) glass-ceramics have shown satisfactory performance in ballistic tests. In this work, transparent glass-ceramics of LS2, LAS and MAS were developed and their mechanical and optical properties were characterized. Glasses were melted (1520-1630 °C) and cast into 1.5 x 5.5 cm moulds. Glasses were cut in the dimensions required for each test, and thermal treatments for crystal nucleation and growth were conducted. Some properties of the resulting glass-ceramics were characterized by Vickers hardness, elastic modulus and fracture toughness. The lithium disilicate composition shows adequate optical transparency, with optical transmission between 70-87% in the visible spectrum. Mechanical properties have demonstrated that these materials are adequate for ballistic armours.
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