The interaction between support-glaze and support-engobe were studied separately regarding the central curvature of ceramic tiles. Were formulated two glazes samples and four engobes samples, these were applied on a particular type of ceramic support with classification in the group B-IIb, by Norma ABNT NBR 13.818/1997 - ISO 13006. Some characteristics were measured as "Thermal expansion coefficient" and "Shrinkage difference between support-engobe". A method was suggested d for evaluation of interaction between support-engobes and support-glazes. The results showed that, for interaction support-glazes the superposition of dilatometric curves method is well implemented; for interaction support-engobe, a statistical test was conducted with factorial design 2², indicating that the variable "Shrinkage difference between support-engobe" is the variable significant to describe the central curvature of ceramic tiles.
curvature; engobe; glaze; ceramic tiles
