A STUDY OF MECHANISM OF GLAZE FORMATION IN THE PROCESS OF BURNING GLAZED BRICK ON THE BASIS OF BEIDELLITE CLAY AND MINERAL COTTON WASTE PRODUCTS

Problem statement. It is essential to establish the values of temperature coefficient of linear expansionof glaze and ceramic material containing beidellite clay and waste products of mineral cotton,and to examine the mechanism of glaze formation in the course of burning by means of infraredspectroscopy and electronic microscopy.Results. The formation of glaze of type ЩЛСО involves glass phase separation which precedescrystallization process.Conclusions. The study of thermoprocessed monoliths shows that liquation structure considerablydecreases at temperatures of 700 оС and 950 оС. Temperature interval of liquation is a function ofglaze thermal treatment conditions. It is shown that crazing resistance of glazed products is determinedby correlation of average temperature coefficients of linear expansion of mass and glaze,therefore, to obtain heat-resistant glazed ceramic brick with temperature coefficient of linear expansion6.53 · 10-4 оС, it is necessary to use glaze of type ЩЛСО with temperature coefficient oflinear expansion 6.45 · 10-4 оС.