Abstract
Two series of mixes lying in the field of celsian BaO·Al 2O 3·2SiO 2 in the ternary system BaOAl 2O 3SiO 2 were investigated. These compositions were obtained using 35 to 60% barite together with either clay and feldspar or clay, feldspar and quartz. The amount of unreacted BaSO 4 was determined by chemical means. The effect of barite addition on physical properties, reversible linear thermal expansion and modulus of rupture of the produced bodies was verified. Results showed that 35 to 40% barite was consumed in the reaction with other constituents forming celsian BaO·Al 2O 3·2SiO 2 and sanbornite BaO·2SiO 2. Higher additions of barite left unreacted BaSO 4 as a constituent of the fired product. Unreacted barite increased the bulk density, 2.2–2.9 g/cm 3, raised the linear thermal expansion coefficient, 4.2–8.5 10 −6/°C, between 20–1000°C and lowered the modulus of rupture, 450-180 kg/cm 2.
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