This work investigates the particle erosion properties of wear protection layers at high temperatures. The materials tested include tungsten and carbide cermets, nickel alloys, and chromium steel applied by different thermal spraying methods. Among key findings: HVOF-sprayed Cr 3 C 2 -NiCr cermet coatings showed the least amount of wear after particle erosion testing. It was confirmed that erosion resistance depends on elastic-plastic conditions between the particles and coating surface, not layer hardness. The impact of solid particles does not cause abrasion in elastic friction areas and only rarely causes abrasion in regions where plastic plowing occurs. Paper includes a German-language abstract.

This paper examines plasma-sprayed layers obtained from low-cost mixtures of cast iron and NiCrSiB powders. The composite coatings are characterized based on friction and wear testing and are found to have better tribological properties than coatings produced from any single alloy powder. The structure and properties of composite layers with different compositions of iron and nickel are investigated as well. Paper includes a German-language abstract.

Quasicrystalline (QC) alloys constitute a family of materials with low coefficient of friction, high hardness, and high yield strength under compressive stress. This paper examines the characteristics of QC composite coatings deposited by LPPS and HVOF spraying. It compares the coatings based on phase distribution and microstructure. Both compositions studied are extremely wear resistant, but their friction properties require further development. Paper includes a German-language abstract.

In this study, polyamide 11 and polyamide-alumina layers are produced by flame spraying and assessed based on microstructure and corrosion and wear resistance. Among the more notable findings: During the spraying process, there is a loss of crystallinity and polymorphism in the polymer due to high heating and cooling rates. Although some particle degradation occurs in flight, it is does not significantly alter the properties of the polymer. Insufficient substrate temperature impedes the melting of the polymer matrix and embedding of the ceramic filler particles, which has a negative effect on the abrasive wear resistance of the resulting composite layer. Overall, the coatings exhibit good corrosion resistance. During electrochemical testing in a saline solution, there was no electrolyte penetration. Paper includes a German-language abstract.

This study compares the corrosion resistance of a wide range of coatings in a chlorine-containing atmosphere at elevated temperatures. Four HVOF-sprayed NiCr coating samples were produced and tested along with an iron-aluminide HVOF layer, a chromium diffusion layer, and a laser-treated HVOF NiCrMo layer. The investigators found that the structure of HVOF coatings has a major effect on corrosion resistance and that chlorine corrosion primarily attacks the substrate through cracks and interconnected networks of pores and oxides at splat boundaries. They also observed that laser melting increases corrosion resistance by homogenizing the coating structure. Paper includes a German-language abstract.