Estudo experimental do deslizamento lubrificado de metais em contato cilindro-plano

Abstract

In this study was evaluated the tribological performance of biodegradable ricin oil compared to the commercial oil SAE 40 through the test lubricated wear of metals existing in the market, such as aluminum 6261, bronze TM-23 and AISI 1045 steel quenched and tempered. All tests were performed in a tribometer sliding wear designed to explore the wear of the metallic sample. The normal load applied in this work was 9N and 20N, the relative velocity and sliding distance were respectively 0.83 m/s and 6 Km, both determined after initial exploratory experiments. The heating system due the sliding friction was monitored using thermocouples type K, located to 3±0,5 mm from the contact. Additional monitoring was performed through of sensors that measure the sound pressure level (NPS) and the global speed of vibration (VGV) to the system. Metallic materials were previously characterized through measures of roughness, hardness, metallographic analysis and DRX. Density measurements, viscosity, flash point and acidity were performed to characterize the oil lubricants. The wear mechanisms on metal surfaces were analyzed by optic (OM) and scanning electron microscopy (SEM). The results of heating at 3 mm from the contact show better results for the ricin oil.