Efeito da adição da mistura caulim/bauxita nas propriedades da argila vermelha

Abstract

The union of two or more materials can yield a product whose properties and characteristics are different from isolated behavior of these materials. In order to evaluate a particular red clay of the Amazon region, this work is based on the characterization of a red ceramic mass with the addition of mixture kaolin/bauxite to develop mullite after firing and check some of their final properties. The main results can cite the following values found for samples evaluated: density values between 2.3 and 1.8 g/cm³ breakdown voltage three-point bending values between 18.919 and 32.580 MPa, elastic modulus values between 35 and 25 GPa. In addition to these values, the behavior in relation to the addition of kaolin / bauxite mixture, in order to improve the mechanical properties of the material presented behavior contrary to the expected. By adding kaolin / bauxite mixture (Samples C, D and E) by weight it was found that both the strength of the 3 point bending, the elastic modulus, and density showed a decrease in their values with increasing amounts of the mixture. Thus, from the preparation of these samples and the study of the influence of the addition of mixing kaolin / bauxite to red pottery clay was observed that with the addition of kaolin mixture kaolin / bauxite no increase in flexural strength values or the elastic modulus and density values. This conclusion contradicted the initial hypothesis of the work and it is suggested, therefore, that further work be undertaken to better understand the behavior exhibited by adding the mixture to clay red ceramic.