The final paper based on the measurement of the coefficient of friction of contacts of various tribological surfaces of the composite water-hydraulic cylinder and seals. In the beginning, the general properties of composites and tribological coatings and their use in hydraulics are described. The following describes the process of producing samples of composite water-hydraulics cylinder and numerical simulations on the basis of which we produced the samples. The experimental part represents at first measurement of the roughness and hardness of samples of a composite water-hydraulic cylinder with different tribological surfaces, followed by the results of measuring the coefficient of friction of seals in combination with various tribological surfaces in water.
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