Document Type : Review Articles
Glass Research Dep
A teacher in The American International School in Egypt - West Campus zaid City
Faculty of Applied Art, Glass Dep. , Dokki P.C. , Helwan University, Cairo, Egypt
Mosaic glass-ceramic was prepared from external glass cullet (waste glasses). The collect external glass cullet include float glass , green, blue and brown glass bottles which undergo milling (<0.063 mm) then shaping by uniaxial pressure and finally sintered at different temperatures. However, the powder of float, brown, green and blue glasses were shaped in the form of mosaic pieces and sintered at 650, 700 and 750 ˚C. The developed phases were low quartz and wollastonite. The microstructure shows submicron and nano size particles spread in glassy matrix. The densities and hardness of the sintered glass-ceramic samples were between 2.22 and 2.45 g/cm3 and 650 kg/mm2 respectively. Also the coefficient of thermal expansion CTE of the sintered sample was 50 x 10-7 ˚C-1 (25-500 ˚C) and is better than the parent bulk glass. The chemical resistance of the sintered glass powder in water and acidic medium were better than in the parent bulk glass. The final products have good properties and can used in decorative and ornamental purposes.