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The Phase Evolution at High-Temperature Treatment of the Oxide-Fluoride Ceramic Flux

Author Affiliations

  • 1 Chemical Department, Kyiv National Taras Shevchenko University, 01601 Kyiv, UKRAINE
  • 2 The E.O. Paton Electric Welding Institute of NAS of Ukraine, 03680 Kyiv, UKRAINE

Res.J.chem.sci., Volume 4, Issue (4), Pages 71-77, April,18 (2014)

Abstract

The products of high temperature treatment of the oxide-fluoride ceramic flux of the composition MgO (30.0 mass. %) – Al2O3 (25.0 mass. %) – SiO2 (20.0 mass. %) – CaF2 (25.0 mass. %), which was obtained using liquid glass as a binder, were examined by means of X-ray powder diffraction (XRPD). The slag obtained by the ceramic flux remelting at 1773 K according to XRPD data contains MgAl2, CaF2 and Mg2SiO4 phases. High temperature X-ray diffraction data (HTXRD), collected at heating regime, show that the initial components exist in the ceramic flux at temperatures (T) 1473 K. The partial melting of the ceramic flux is accompanied with formation of crystalline MgAl2O4 phase. Detail examination of the slag samples by means of scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) microanalysis confirms results of the XRPD and HTXRD studies.

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