Desenvolvimento de casca cerâmica à base de mulita para fundição por cera perdida

Abstract

The purpose of this work is to optimize the manufacture of small metal parts using the shell systems to be applied by the Foundry Laboratory of the Federal University of Ceará (UFC). Every year the Foundr y Laboratory receives dozens of UFC students who attend the casting discipline, whose practical classroom helps to establish the knowledge acquired in the classroom. Among these practices, the investment casting shell stands out. Although the requests for processes carried out in the laboratory do not have the same complexities as in the industry, it is important to develop a process that can be replicated in the academic space, offering students practical access to the basic fundamentals of this manufactur ing process. This work has as a starting point other studies carried out in the laboratory previously, however, this time it seeks to develop a procedure more similar to what happens in the industry using simple materials that meet the proposed objectives. Therefore, a wax based model tree will be built, as in the industry, for the manufacture of more than one metallic part at a time. For this, refractory mullite will be used as the main material for the construction of the ceramic coating that will cov er t he wax tree forming a kind o f bark. The reversed tree will then be heated to melt the wax. Finally, the space left in the coating will be filled by the metal that will take the shape of the ceramic shell.