Abstract

CABRERA, A.B.  and  MENDOZA, M.E.. Lamellar ceramics of Ca₂SiO₄ prepared by mechanical activation of powders. Rev. mex. fis. [online]. 2006, vol.52, n.4, pp.346-351. ISSN 0035-001X.

Stoichiometric mixtures of calcium carbonate and silicon oxide have been mechanically activated by milling during several hours (29 and 50) previous to the solid state reaction, in order to obtain dicalcium silicate, Ca₂SiO₄. X-ray powder diffraction and differential thermal analysis studies show that the mechanical processing of the powders induces changes in the orientational uniformity of crystallites and the diminution of the decomposition temperature of the calcium carbonate. Microlamellar particles of β-Ca₂SiO₄ were obtained when the solid state reaction was achieved at 1450°C, whereas β-Ca₂SiO₄ and α'_L-Ca₂SiO₄ phases were obtained when the reaction took place at 1000°C. By means of the powder processing described in this work, we can prepare phase β-Ca₂SiO₄ without any chemical stabilizer and with an unusual lamellar morphology.

Keywords : Dicalcium silicate; mechanical activation; lamellar morphology.

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