Caracterização de revestimento duro por aspersão térmica chama a pó utilizando liga Stellite 6 com adição de alumina

Abstract

The coating process is extremely important to industry because it extends the life of components that can be damaged or wear out due to continuous use. Hence, the total costs are reduced, once it is not required to replace parts or to stop the machines for maintenance. This work aims to test and analyze the results for the coating produced by flame powder spray coating process. The addition material is a mixture powder composed by a cobalt based alloy, Stellite 6 and alumina. Four different concentrations of alumina were used to compose the mixture: 1%, 2%, 4% and 8%. The substrate to be coated is the SAE 1020 steel. The tests and analysis presented are: folding test, optical microscopy analysis, microhardness Vickers test and wear analysis by scratch test. The obtained results showed that the addition of alumina in Stellite 6 mixture enhances the coating’s mechanical properties. In relation to the wear resistance of the coating, which is the most important property in this study, the Stellite 6 mixture added with 8% of alumina presented the best results.