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Mechanical behavior of tribofilms formed from MoDTC and ZDDP additives in ethanol engines

Grant number: 18/25962-3
Support type:Scholarships abroad - Research Internship - Doctorate
Effective date (Start): July 15, 2019
Effective date (End): July 14, 2020
Field of knowledge:Engineering - Mechanical Engineering
Principal Investigator:Roberto Martins de Souza
Grantee:Roberto Balarini Junior
Supervisor abroad: Anne Neville
Home Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Local de pesquisa : University of Leeds, England  
Associated to the scholarship:17/19147-2 - Mechanical behavior of tribofilms formed from MoDTC and ZDDP additives in ethanol engines, BP.DR

Abstract

Higher efficiency solutions are the main driving force regarding the future of internal combustion engines (ICE). The use of low-viscosity engine oils combined with new additive packages are one of the most promising paths to reduce the friction of internal components, decrease the CO2 emissions and increase the engine durability. On the other hand, some tribological complexities can play a role in the case of ethanol-fuelled engines, since ethanol has a much higher latent heat of evaporation than gasoline, and thus its accumulation in the lube can be significant. The impact of ethanol contamination on some types of additives (e.g.: FM - friction modifiers and AW - anti-wear) is not well-understood. The most common FM additive is the MoDTC, while ZDDP is used as oil an AW additive since the 1970's. The aim of this project is to investigate the influence of ethanol on the mechanical properties of the tribofilms formed from MoDTC and ZDDP oil additives. Hence, MTM tribological tests will be conducted under fresh (no ethanol contamination) and contaminated (with ethanol dilution) oil conditions. The idea is to compare the influence of the ethanol contamination on tribofilm activation, thickness (MTM-SLIM setup) and depletion. Moreover, the mechanical properties will be investigated by Atomic Force Microscopy (AFM), in conjunction with detection techniques (e.g., Raman Spectroscopy and/or XPS) required to identify the tribolayer spatial distribution. This internship proposal is expected to happen between May-2019 and April-2020, at the University of Leeds, where there is a great expertise on tribofilm identification and properties.

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