Utilização do planejamento fatorial na otimização do processamento de cerâmicas magnéticas : determinação dos parâmetros de sinterização

Abstract

Several researchers from various areas of science have developed materials seeking a relatively low compared to other materials already available on the market, with important properties and consequently a vast field of application. Among these materials, which has excellent magnetic properties, which is a kind of advanced ceramic which has excellent magnetic properties. Based on this, this study aimed to evaluate the microstructural and magnetic characteristics of Co0.5Cu0.5Fe2O4 ferrites sintered in a conventional furnace using a classic two-level (2k) factorial planning tool, with the need to optimize the processing of ceramic materials magnetic. For this, the sintering parameters, temperature (900 °C, 1150 °C and 1400 °C), heating rate (5°C / min, 10 °C / min and 15 °C / min) and time (1h, 2h and 3h), in which he exposed them to certain definitions, through the data from the planning matrix, obtained from the 2k factorial planning, added to the central point, in order to optimize the effects of the variables in the processing of magnetic ceramics. The were characterized by XRD, SEM, EDS, physical measurements and magnetic measurements and the results, saturation magnetization, apparent density and apparent porosity, were compensated based on the variation analysis and also by the response surface methodology (MSR). From the observed results, it appears that the conditions of synthesis and sintering, in general, favor the obtainment of the ferrite phase with a uniform microstructure. From the frontal data by the response surface methodology, for the saturation magnetization, apparent density and apparent porosity, the temperature factor effect was more significant when compared to the heating time and rate. This analysis was perceived in a more objective way when a planning factorial statistical tool was used, which emphasizes the importance of this tool in ceramic processing, in the sense of cost and process time savings, which for the industrial sector is essential.