Authors: B.I. Kovalsky, A.A. Ryabinin, A.N. Sokolnikov, V.I. Afanasov, P.Yu. Pustovit

Title of the article: Methods for control of thermo-oxidative stability of engine oils

Year: 2020, Issue: 6, Pages: 13-25

Branch of knowledge: 05.02.11 Methods of control and diagnostics in mechanical engineering

Index UDK: 621.892.2

DOI: 10.26730/1999-4125-2020-6-13-25

Abstract: Two methods for determining the indicators of thermo-oxidative stability are presented on the example of a partially synthetic motor oil Lukoil Super 10w – 40 SG / CD. Both methods are aimed at expanding information on the quality of the engine oil under study. The first method provides for the determination of optical density, volatility, coefficient of thermo-oxidative stability, potential life, oxidation onset and evaporation temperatures, temperature transformations and critical temperatures of these processes. The second method increases the amount of heat absorbed by the products of oxidation, evaporation and temperature transformation. In addition, it allows us to determine the latter not only analytically, like the first method, but also graphically due to the linearity of the dependences of the thermo-oxidative stability indicators on the time and temperature of thermostating of the oil under study, presented in logarithmic coordinates.

Key words: optical density volatility coefficient of thermal-oxidative stability oxidation onset temperatures temperature transformations critical temperatures potential life decimal logarithms of thermal energy absorbed by the products of oxidation evaporation and temperature transformations decimal logarithm of thermostating time

Receiving date: 10.12.2020

Publication date: 29.12.2020

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