The Effect of the Substrate on the Microstructure and Tribological Properties of Cold Sprayed (CrC-25(Ni20Cr))-(Ni-graphite) Cermet Coatings.

In this work, the effect of the substrate, Al 7075 alloy and 1H18NT9 stainless steel, on the microstructure and tribological properties of cold sprayed (CrC-25(Ni20Cr))-(Ni-graphite) coatings was investigated. Both coatings were dense and did not reveal any discontinuities at the interfaces. They had similar CrC and graphite contents.

Optimization of Mechanical Properties of CrC-Ni20Cr/Graphite Cold Sprayed Coatings.

This study analyzed the mechanical properties of cold-sprayed CrC-25(Ni20Cr) blended with Ni-graphite as a solid lubricant deposited on 7075 aluminum alloy substrate. To optimize the coating properties, different sets of parameters (graphite content in feedstock, process gas composition, spraying distance, and traverse gun speed) were tested in the frame of the Taguchi experiment. The cold-sprayed coatings were evaluated for their chromium carbide and graphite content, hardness, and coefficient of friction.