Functional coatings

Application of thin films enables controlled enhancement in material properties. Depending on the application, the coatings fulfil special functions: in the case of tribologically stressed components, they reduce mechanical abrasion or, in the case of metals, the tendency to corrosion. They serve to improve the adhesion of material composites, have a decorative character, make it easier to keep clean or can give the surface of plastics increased scratch protection. As a structurally conformal, low-porosity and transparent barrier layer, they prevent the permeation of gases (e.g. in PET bottles) or protect sensitive goods from the diffusion of solvents from the wall of plastic containers. In semiconductor technology and optics, coatings take on functions as dielectrics, EMC shielding or anti-reflective layers. A particular interest lies in photocatalytic and ceramic surfaces:

Photocatalytic surfaces are characterized by a layer of a transition metal oxide, usually TiO2, which is activated by irradiation. Thus, in combination with a naturally present thin film of water, for example, OH radicals are produced, which then interact with cells, microorganisms, fats and other liquids. Such surfaces are particularly advantageous for implants. TiO2 is approved as a material for medical implants, so that there are no major hurdles to overcome with regard to the approval of such a refined implant as a medical product.

Ceramic surfaces are often used in technical as well as biomedical applications. Compared to conventional processes, the already established method of plasma spraying allows the creation and development of unique coatings with complex property portfolio. The uniqueness of the process lies in the almost arbitrary combination possibilities and mixtures of powders (metals, glasses, ceramics, polymers, etc.) and the high material deposition rate or layer thickness. In the biomedical field, coatings with TiO2, CaCO3, Cu, Ag, ZnO and their mixtures are the core competence of the INP. The system used at INP is an industrial system with a very common plasma source. This has the advantage that coatings and coating systems developed with it can be directly used by the customer or ordered from established contract coaters without process scaling.