Per: FLANELSON MACIEL MONTEIRO (INSTITUTO FED EDUCACAO, CIENCIA E TECN RIO GRANDE NORTE), Anna Beatriz Almeida Leandro da Costa (IFRN), Bruna Pereira do Nascimento Souza (IFRN)
Abstract:
The clay is a material of sedimentary origin of fine granulometry, around 0.002mm, found with ease in the terrestrial sphere. The variations occurring in the clays are due to its intemporal process, including the aspects that determine the concentration of each chemical element present in its composition. The coloring of the products manufactured with these materials is the result of these variations. However, among the different types of clays, those with a lower amount of ferrous oxides have a coloration between beige and yellowish at the end of the production process. This clay is known as white burn because of the color shades acquired after the sintering process and although it may have similar applicability to red, it is not commonly found by industry, which makes its value significantly higher. The State of Rio Grande do Norte has deposits of this material in its territory, for example, the municipalities of Nova Cruz, Macaíba, São Gonçalo do Amarante, Brejinho, Goianinha and Boa Saúde, where samples of the material were collected studied in this work. Therefore, the purpose of this study is to analyze the technological properties of ceramic masses, made with a clay from the city of Boa Saúde-RN, for application in the ceramic tile industry. The experimental procedure was started with the sampling and the beneficiation of the material, which was comminuted and sieved in an ABNT 200 mesh sieve. At the end of the process, all raw materials used had a final particle size of 0.074mm. The compacting process of the specimens was done in a hydraulic press with a pressure of 21 MPa. The samples were then sintered in a muffle furnace, without protective atmosphere, at temperatures of 1000 ° C and 1100 ° C, with a heating rate of 10 ° C / min and a 60 minute isotherm plateau. In total, a total of forty (40) specimens were prepared, and twenty (20) samples were sintered per temperature. The technological properties of the samples were measured using the following tests: water absorption (AA%), linear retraction (RL%), fire loss (PF%), apparent porosity (PA%) and apparent specific mass ). Finally, after analyzing the results, it was observed that the studied material can be destined for the ceramics sector porous coatings, especially for the presented results of AA% and PA%.
