Abstract
In this work, the effect of the substrate, Al 7075 alloy and 1H18NT9 stainless steel, on the microstructure and tribological properties of cold sprayed (Cr3C2-25(Ni20Cr))-(Ni-graphite) coatings was investigated. Both coatings were dense and did not reveal any discontinuities at the interfaces. They had similar Cr3C2 and graphite contents. Their microstructures showed a variety of grain sizes of the matrix phase between the inner part of the splat, showing large ones, and their boundaries, where elongated and nanostructured grains were formed during the deposition process. The coating deposited on the steel substrate revealed a slightly higher hardness and lower abrasive wear with the Al2O3 loose abrasive particles. The force required to destroy the durability of the coating–steel substrate system in the three-point bending test was higher than those of the other ones. The cermet deposit cold sprayed on steel and examined at 25 °C under 10 N revealed the best wear resistance and the lowest friction coefficient.
Highlights
Composite coatings are commonly used to protect working elements, mainly in the printing, automotive and aviation industries, where wear occurs in the processes of in‐tense friction at high temperatures
Cold sprayed deposits are produced by strong plastic deformation of the metal particles at a temperature below the melting point of the feedstock material
The Diamalloy 3004 powder consisted of irregular Cr3C2 ceramic particles and a spherical‐like Ni20Cr matrix powder (Figure 2a,b)
Summary
Composite coatings are commonly used to protect working elements, mainly in the printing, automotive and aviation industries, where wear occurs in the processes of in‐tense friction at high temperatures. Ing popular [5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20] This type of coating has been deposited on various substrates, usually on low‐carbon steel [5,6,7,8], corrosion‐resistant steel, and aluminium alloys [21], depending on the application of the working element. Compared to other deposition techniques, cold spraying ensures more advantages of the obtained coatings, for example, no phase trans‐. Cold sprayed deposits are produced by strong plastic deformation of the metal particles at a temperature below the melting point of the feedstock material.
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