Aplicação do revestimento de wc depositado por aspersão térmica pelo método hvof para diminuir a abrasão do grão de arroz em máquinas agrícolas

Abstract

With the mechanization of agriculture, the need became the continuous improvement of agricultural machinery and implements. Thus, some problems are incessantly faced, such as the wear of mechanical components caused by contact with the grains for example. Due to the need to obtain a surface that increases the useful life of parts and components of machines and that possesses mechanical properties that are resistant to the abrasive wear, due to the contact with the rice grain with husk, a surface was covered by thermal spray Using the high velocity oxygen fuel deposition method with tungsten carbide powder on the components prepared and post-treatment with CO2 laser, in order to obtain a better adhesion of the coating and the substrate. This coating, because of its high hardness, is highly resistant to abrasion, adhesion and erosion. It has a dense structure, with very low porosity and a very high adhesion to the substrate. The coated samples were characterized by Scanning Electron Microscopy (SEM) to evaluate the coating morphology, optical emission spectrometry to evaluate the chemical elements present in the substrate, microhardness analysis, wear test and roughness test. The tests and analyzes showed that the WC coated samples showed better performance in microhardness, wear and roughness tests compared to samples irradiated with the laser beam.