natrysk

Natrysk, or spraying, is a term used in materials engineering to describe a family of coating deposition processes in which a coating material is accelerated in a gas stream and projected onto a substrate to form a coating. The technique can apply metallic, ceramic, polymeric, or composite feedstocks and is used to create protective, functional, or decorative layers.

Common methods include thermal spraying, such as plasma spray, high-velocity oxy-fuel spray, flame spray, and arc spray, where the coating material is heated above or near its melting point before impact. Cold spraying uses solid-state deposition, with particles accelerated to high velocity and bonding through plastic deformation without substantial heating. Feedstock powders or wires are propelled through a nozzle, forming coatings that range from porous to dense. Process parameters like particle velocity and temperature, stand-off distance, and substrate preparation influence adhesion, cohesion, porosity, roughness, and residual stresses.

Materials used in natrysk cover a wide spectrum, including metal-based coatings (e.g., aluminum, nickel, steel alloys), ceramics (e.g., alumina, zirconia), cermets, and polymeric composites. Coatings are selected for wear resistance, corrosion protection, thermal insulation, hardness, or surface functionality.

Applications span aerospace, automotive, energy, tooling, medical implants, and other industries where complex shapes or thick protective layers are needed. The technique has a long history of development and standardization, with quality assessment typically addressing adhesion, porosity, microstructure, and coating thickness, complemented by post-deposition finishing when required.