Alternativa contra desgaste em buchas de proteção de eixo de bomba de água utilizando o processo de aspersão térmica a arco

Abstract

The shaft protection bushing is a component of a water pump to serve as a defense against wear, corrosion and erosion of the shaft. Under the operating conditions in which they are exposed, they suffer wear and oxidation, which can cause defects that compromise their operation, such as excessive leakage in the shaft seal, loss of efficiency and noise. In order to analyze the efficiency of the thermal arc sprinkler process (Arc Spray - AS) as an alternative to protect against wear, it is proposed to make a study of the comparison of sprinkled coatings in substitution to the currently used process. Therefore, the materials of the coatings sprinkled in the form of wire to be tested in substitution to the tempered and tempered AISI 420 steel currently used in the shaft protection bushing, will be UTP AF LEDURIT 68 and 60T, which were selected because they are coatings resistant to the problems faced by the bushing. In the literature review, research and consultations were carried out on thermal spraying and its variables, such as: equipment, materials, analysis of sprayed coatings and wear mechanisms. For the study, the sprinkled coatings were evaluated by means of metallographic examinations (micrograph), mechanical tests (microhardness) performed at UFSC and pin-on-disk wear test. After the analysis of the results obtained, the best alternative among the tests carried out was the 60T chrome steel coating wire.