The Mechanical and Tribological Properties of Cold-Sprayed Cermet Coatings—Al Alloy Substrate Systems

Abstract The article describes the influence of a solid lubricant such as graphite on coating-substrate adhesion, susceptibility to cracking during three-point bending tests and tribological properties cermet systems. Two types deposits Cr 3 C 2 -25(Ni20Cr) (Cr -25(Ni20Cr))-5(Ni25C), cold-sprayed Al 7075 alloy substrate, were analyzed. coatings showed homogeneous microstructure with evenly distributed ceramic particles in Ni20Cr matrix. -25(Ni20Cr))-5(Ni25C) also contained placed both between metallic near crushed particles. force required for crack that appeared system test under constant velocity was significantly higher case deposit than without lubricant. cracks observed perpendicular interface. embedded coating structure prevented formation nuclei cyclic load at room temperature reduced size 200 °C. Both revealed same adhesion. addition not only did deteriorate adhesion thus their quality but improved other properties, flexural strength wear resistance. Coatings containing lower index examined elevated temperatures. This recommends use industry working heavy conditions. presented results mechanical effectively fill gap regarding coatings.