Deposition of MoS 2 -TiN Multilayer Films on 1045 Steel to Improve Common Rail Injection System
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Deposition of MoS2-TiN Multilayer Films on 1045 Steel to Improve Common Rail Injection System L.C. Silva, M.S. Libo´rio, L.L.F. Lima, R.R.M. Sousa, T.H.C. Costa, M. Naeem, D.A.P. Reis, P.A. Radi, and S.M. Alves (Submitted May 18, 2020; in revised form August 24, 2020; Accepted: 19 September 2020) In this study, plasma treatment was performed to increase the surface hardness, followed by the deposition of MoS2-TiN multilayer films by magnetron sputtering to reduce friction and facilitate sliding contact. The tribological test was performed with a tribometer (cylinder-disc type) developed exclusively to simulate the behavior of these components under pressure and movement conditions similar to those present in the common rail injection system (CRIS). The results obtained in this work showed a considerable increase in surface hardness due to the formation of iron nitrides caused by the plasma treatment, which slightly decreased by solid lubrication coating (MoS2). The increase in cycles in the tribological test causes a reduction in surface roughness due to the softness of the MoS2 layers by plastic deformation. The combination of plasma treatment and MoS2-TiN multilayer films contributed to the decrease in mass loss and better performance of the studied components. Keywords
cathodic cage plasma treatment, common rail injection system (CRIS), lubrication coating, thin films, wear
1. Introduction The diesel cycle engines have a high level of energy efficiency in fuel consumption. These engines use an injection system that pressurizes the fuel at high pressure in the combustion chamber (Ref 1, 2). Currently, the common rail injection (CRIS) system is the main fuel injection system found in the world market, considered as a system of high efficiency and excellent applicability in all vehicles (Ref 3, 4). It uses higher and more parameterized injection pressures, generating low pollutant emission index and reaching considerable power and low noise values that meet the needs imposed by the market (Ref 5-7). Such a system has a large number of internal components, forming several sets of tribological pairs, which are increasingly required in terms of pressure, temperature, and lubrication. As a result, it makes the system with many points susceptible to failure (Ref 8). To improve the performance of the mechanical components present in the CRIS, promoting lubricity and, consequently, the durability of the set is required. It is essential to develop studies and new ways for the intense use of components that contribute to the dynamics of the injection system (Ref 9). Thus, in recent years, these needs have moved the engineering area with interest in changing the surfaces of materials, giving them L.C. Silva, T.H.C. Costa, and S.M. Alves, Post-Graduate Program of Mechanical Engineering – UFRN, Natal, Brazil; M.S. Libo´rio and L.L.F. Lima, School of Science and Technology – UFRN, Natal, Brazil; R.R.M. Sousa, Department of Mechanical Engineering – UFPI, Teresina, Brazil; M. Naeem, Department of
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