Abstract
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.
Highlights
The production of glass powder or amorphous materials is expensive because it requires high temperatures to reach the melting point of the industrial mineral blend [1] or sophisticated techniques for the synthesis of amorphous material
The flexural strength was obtained by the three-point bending test and the results analyzed by the Weibull analysis
All are very inert and stable compounds. With this analysis we can observe that the glass powder used in this project has a similar composition to the raw material used for the glass ceramics production [6], that are of higher cost [14,15]
Summary
The production of glass powder or amorphous materials is expensive because it requires high temperatures to reach the melting point of the industrial mineral blend [1] or sophisticated techniques for the synthesis of amorphous material. Numerous studies show the importance of glass-ceramic They are smooth materials, have higher flexural strength than glass and, in relation to ceramic materials, have better mechanical properties due to lower residual pore contents, which can provide the machinability of the glass ceramics. They may have low electrical conductivity and thermal dilation close to zero [6,10]. Cerium oxide is an example, it is a nucleating agent used to improve sintering, strength and thermal stability of the glass-ceramics [11]
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