Análise de porosidade em alumínio com adição de celulose

Abstract

The use of aluminium alloys are currently indispensable due to its applications to multiple threads. Its microstructure is contituida involves important steps, such as the type and content of alloying elements added, which reflect in its features. The porosity is one of the most common defects caused by the casting process, which is given by the solubility of hydrogen in molten metal, which should be avoided. Thus, the determination of the physical and chemical characteristics of the League is of utmost importance to ensure your quality. This work represents the study related to this defect, in order to characterize the samples through two methods, by the Principle of Arquimédes and sampling area, and correlate them. The green sand casting, molten liquid metal was added levels of cellulose and filled by lost foam molding. With the samples already certain, were examined microscopically and carried out the methods. The results obtained by the method of Arquimédes principle were erroneous due to many encrustações, impurities and carbon in the alloy housing due to evaporation of cellulose. With the results of the second method, which was determined by sampling area, if made consistent, however, the same becomes subjective due to high probability of error and difficulty in the pores and carbon on microstructure. The study made the idea of applicability of relevant residue in aluminium alloys, however, inconclusive results on completion of the work.