Where food is produced and processed, machines, equipment and processing systems must meet high requirements. Where surfaces come into contact with food, chemical resistance is one, if not the most important requirement for the material.
Bearing seats and sealing seats on distribution shafts of filling lines are often coated with a ceramic in the form of chromium oxide and then mechanically processed. As a result, the surface receives the required quality and achieves dimensional tolerances of up to a few micromillimetres.
Cutting knives are given a sharp cutting edge by being coated with carbides and become more wear-resistant than uncoated knives due to the thermal coating. In addition, they then have a high fracture toughness.
Welding tools and sonotrodes can be made conductive with a special ceramic. This makes the tool contact surface with the film even more wear-resistant and the service life is significantly increased.
In the food industry, however, not only wear and tear plays an important role. It is also the so-called corrosive attacks of the conveyed media that have an enormous effect on the component surfaces. For example, sealing seats on distribution shafts in filling systems are exposed to a wide variety of media that have a very strong effect on the material. In order to noticeably extend their service life, they are therefore often coated with a ceramic such as chromium oxide or a carbide such as chromium carbide and then polished.