This thesis presents the analysis of mineral oil samples, which includes the measurement of the purity of unused oil, ferrographic microscopy and evaluation of particle morphology. In each measurement, it is explained what the implementation steps were and what results we came to. We found that particles of different shapes and sizes appear in oils, and that the degree of wear depends on these two parameters. If we want to reduce the wear rate and extend the life of hydraulic components, it is important to have information about the shape of the particles, as this has a very large impact on the wear rate.
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