X Ray Diffraction Analysis of Processes in Specific Enamel Blend during Heat Treatment

Abstract

The present work deals with the physicochemical processes occurring in the Na2OSrO-
BaO-B2O3-SiO2 system’s theoretically envisaged enamel blends designed for
coating copper.
X-ray analysis revealed that the processes in enamel blend while heat treatment can be
conditionally presented in several stages. The first stage covers 383-773 (973) K temperatures,
resulting in formation of the first portions of different stoichiometric sodium
borates and the liquid phase. The second stage corresponds to 773 (973) -973 (1073)
K temperature range where Sr and Ba borates and silicates are formed and in case of
increased amount of liquid phase their triple compounds are formed. On the third stage
refractory compounds are dissolved in the liquid phase, at 1173K roentgen-amorphous
product, suitable for enamel production, and at 1373K glass are obtained.