Sinterização, caracterização e propriedades de compósitos vidro-minerais para uso como revestimentos
Abstract
Engineered stones, commonly known in Brazil as quartz surfaces, are
materials used as large tiles for application in architecture and interior
decoration. These materials consist of about 90% by weight of mineral particles
of various shapes (usually quartz, but mica and feldspar are also used)
dispersed in a polymer resin matrix. Despite its aesthetic appeal, the use of a
polymer matrix leads to low wear resistance, low chemical resistance and great
possibility of degradation of the polymer by UV rays and permanent marks by
contact with hot objects. Thus, this project objective was the development and
optimization of compositions and conditions of thermal treatment,
characterization and viability of engineered stones with glass instead of a
polymer matrix. Glass-mineral composites containing up to 70% weight of
albite, alumina, petalilte and quartz (the rest being recycled window glass) were
studied, with special attention in obtaining samples with low porosity. The
composites were also characterized in relation to some properties, such as
flexural strength, hardness, Kc, water absorption, resistance to thermal shock
and resistance to chemical attack. With the exception of Quartz / Glass
composites, it was possible to obtain materials of low porosity and diverse
competitive properties in relation to other products already available. A
composition containing glass and alumina had a flexural strength of 115 MPa
and a hardness of 9 GPa; The composite of petalite and glass exhibited greater
resistance to thermal shock; The albite and glass composite exhibited better
resistance to chemical attack practically unchanged even when in contact with
solutions of NaOH 10% (v / v), acetic acid 10% (v / v) and citric acid 3 g / L.
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