In this study, ZrN coatings are applied on glass and carbon fiber reinforced epoxy composite materials by magnetron sputteringmethod to gain an improved understanding of the solid particle erosion (SPE) wear resistance. The tests were carried out byselecting two different impact velocities (34, 53 m/s), four different impingement angles (30°, 45°, 60°, 90°) and two differentabrasive (SiO2) particle sizes (approximate 250, 500 m). The thickness of ZrN coating material was 0.15 m. Protectivecoatings produced by using Physical Vapor Deposition (PVD) method can increase the life time of the components. All testspecimens regardless of their various parameter properties exhibit maximum erosion rates at 45 impingement angle and thusexhibiting similar behavior as that observed for semi ductile materials. Optic microscopic views were performed on thesurfaces in order to characterize the erosion mechanism. The erodent particles of the both coating layer and composite matrixwere found of main role in governing the wear progression. The measured erosion rates were sensitively correlated with thematerial removal process in order to explain the changes within the coated interfaces. Moreover, an erosion test facility at roomtemperature and Taguchi’s orthogonal arrays were used for experimentation. The expression derived from the results ofTaguchi experimental design is proposed as a predictive equation for estimation of erosion rate of these composites. It isdemonstrated that the predicted results from this equation are consistent with the experimental observations. Finally, anoptimal parameter combination was determined, which led to minimization of erosion rate (ER).