Mechanical Activation of BaCO3-Al2O3-SiO2
A BaCO3-Al2O3-SiO2 mixture was mechanically activated for 2 and 4 hours. Chemical composition of the mixture corresponded to BaAl2Si2O8. Reaction course was followed in the temperature range 750°–1200°C as a function of activation time. Reaction of celsian formation was followed using thermogravimetry as well as conventional and high-temperature X-ray diffractions. The obtained data show that reaction rate increases with prolonged activation time, under the same conditions of thermal treatment. Formation of hexacelsian was favoured with increasing activation time. Formation of monoclinic celsian was retarded, with longer activation.
KeywordsMechanical Activation Reaction Path Ceramic Matrix Composite Reaction Rate Increase Specific Surface Area Measurement
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- 1.J.E. Planz, H.M üller-Hesse, Ber. Detsch.Keram.Ges., 40 (1963), H 3, 191–200 Untersuchungen über Festkörperreaktionen im System BaO-Al2O3-SiO2 Teil II: Über die Celsianbildung durch Festkörperreaktionen.Google Scholar