The results of research on the process applying lubricating coatings are presented in this work. For purpose, plastic greases were used, which base oil is perfluoropolyether (PFPE) and thickener poly(tetrafluoroethylene) (PTFE). Due to their consistency, these materials classified into different classes according National Lubricating Grease Institute (NLGI). was carried out using a time-pressur...

In greased contacts, the complex rheology of a grease, depending on thickener, base oil and additives, becomes key point for understanding controlling evolution friction coefficient at extremely low sliding velocities. Such velocity range (from 0 to few mm/s) is main relevance several issues, such as unstable friction-induced vibrations, which can occur well in case lubricated interfaces. this ...

Abstract China has made significant progress in the efficient exploration and development of deep-seated oil gas wells. Reservoir reformation, as core tool high-temperature development, puts forward a strong demand for fracturing fluids. The ultra-high temperature fluid system developed my country is mainly divided into two types: guar gum synthetic polyacrylamide fluid. high resistant composed...

Plastic lubricant with rapeseed oil dispersion medium is considered addition of diphenylamine antioxidant additive. Analysis tribotechnical, chemical and physicо-mechanical characteristics the obtained lubricants content additive from 0.5 to 10.0 wt.% carried out. The effect concentration temperature introduction on functional shown. A comprehensive method proposed for evaluating optimal using ...

We consider a model of continuous sedimentation. Under idealizing assumptions, the settling of the solid particles under the influence of gravity can be described by the initial value problem for a nonlinear hyperbolic partial differential equation with a flux function that depends discontinuously on height. The purpose of this contribution is to present and demonstrate two numerical methods fo...