Influência da secagem de massa de revestimento cerâmico em indústria e laboratório.

Abstract

Knowing that is the atomization process in which water contained in a suspension is removed by evaporation in a controlled manner, for ceramic materials, the main function of the atomization process is dry and at the same time the granular powder. The objective of this study was to compare post resulting from the atomization methods in industry and in the laboratory, in addition to the dry powder prepared in an oven by analyzing the technological properties of the specimens due to these materials in order to determine the influence of different types of processing in final properties of the ceramic materials. To develop this work were obtained two types of materials. The atomized powder of a ceramic tile industry, and proceeding slip of the same powder, which was atomized in the laboratory and also prepared by drying in an oven. All samples were characterized with fluorescence test X-ray, X-ray diffraction, thermal analysis, particle size analysis and microscopic analysis. After obtaining the post, the technological properties of the shaped bodies by pressing tests were measured and compared. The results indicate that the resulting powders have different characteristics when compared primarily the morphology and particle size distribution when processed in different ways, with the best results powders atomized in the laboratory, which showed higher sphericity, smaller sizes and a narrow distribution of beads. Regarding the technological properties of burning was not possible in 1250 °C, to obtain the results of linear shrinkage and flexural strength due to pyroplastic deformation in 1250 °C. According to NBR 13818¹ (1997) for ceramic tiles, samples conformed to 1100 ºC ranked in porous coating, to 1150 °C in semi stoneware and 1200 °C and 1250 °C for porcelain ceramic type finish. The optimum firing temperature was reached to 1200 °C.Only the samples conformed to 1200 ºC reached the values set as standard for ceramic coating. Struck up a good firing temperature to 1200 °C. Despite the differences in morphology of post processed in the laboratory and in the industry, the ceramic coating processing in the laboratory can be compared to the industry in processing because it was found that the technological properties of the specimens resulting from different processed powders, obtained similar characteristics, with improving only in linear shrinkage.