Glass-ceramic produced with recycled glass

Resumo

The objective of this work is the production and characterization of glass-ceramic with recycled glass powder
and 4% (w/w) of cerium dioxide. Eleven groups were defined with conformation pressure of 11.6 and 25.8
MPa, and cerium dioxide addition. The sintering temperatures of 650, 675, 700 and 750 °C were used. The
raw material was formed into a mold with a uniaxial pressure. The density was measured by the Archimedes
principle. The water absorption of the groups was also determined, as linear contraction percentage and the
crystalline structure. The flexural strength was obtained by the three-point bending test and the results analyzed
by the Weibull analysis. The specimens presented density ranging from 1.99 to 2.38 g/cm3. Increasing
the temperature provided an increase in the density of the specimens and the flexural strength. At higher sintering
temperature, this behavior was not observed. The highest flexural strength was 63.55 MPa, obtained at
the sintering temperature of 700 ºC, conformed with 25.8 MPa, only glass powder. The increase in the forming
pressure favored crystallization. The addition of cerium dioxide favored for the increase density and the
Weibull modulus, but decrease of the flexural strength.
Keywords: Glass-ceramic, Flexural Test, Weibull Analysis, Wasted Glass recycling and Cerium Dioxide.