Development of Ceramic Coatings

Fraunhofer-Center HTL develops ceramic coatings for use at high temperatures. Based on the customer request, a concept for the development is drawn up and agreed on with the customer. At this occasion, questions about the requirements of the coating, coating technology, substrate material, operating conditions etc. are clarified. The use of material and thermodynamics databases have proven to be effective in the development of a solution approach.

The focus of Fraunhofer-Center HTL lies in the formulation of liquid coating paints and resin systems filled with powder, which can be applied using simple and commercially viable application methods such as dipping, spraying or brushing. The application methods offer many degrees of freedom for the application of a coating. Thus, even components with complex geometries or inner surfaces of components can be coated. Compared to gas-phase and thermal injection processes, wet-chemical processes also frequently offer the advantage of better adjustable microstructures in the coating systems.

Coating of the inner surface of a turbine blade
Coating of the inner surface of a turbine blade

A wide range of standard material systems can be offered for coating, including Al2O3, Al2O3-SiO2, SiO2, rare earth (di)silicates, yttrium aluminium garnet, ZrO2, zirconium titanates, TiO2, SiC, BN or SiBNC.

The coatings are adjusted depending on the customer’s favoured application technique with respect to their processing properties. Depending on the application method and the formulation of the coating, layer thicknesses of about 50 nm to more than 100 µm are possible. Primarily, metallic and ceramic components are coated. After the application of the coating, the layers normally need to be baked. For this, furnaces with different atmospheres (air, inert, vacuum, reducing) and sizes are available. Alternative baking processes such as laser sintering are also possible (Publication: Production of Oxide Ceramic Coatings). During the development of the baking process, it is important not to damage the substrate material. This is done in close coordination with the customer. If the baking process is not required by the customer or impossible for certain reasons, alternative approaches for consolidation of the coatings can be used.


Customized Solutions

The ceramic coatings are used as corrosion and wear protection, for surface sealing (Publication: High-temperature Stable Gas-Tight Sealings), as heating layers or as non-adhesive coatings for metal melts. For characterization of the layers, numerous testing methods are available, also according to DIN EN certified standards. Often further tests are required for the application, in addition to the standardized tests. Therefore, in coordination with the customer, test methods are used, which are of relevance for the layer development or the use of the layer. On behalf of the customer, we coat components or test pieces and test them under application-oriented conditions if required.  

Our Services:

  • Development and characterization of lacquers for oxide and non-oxide ceramic coatings
  • Development of ceramic coatings for high-temperature applications and corrosion protection
  • Sampling of customers with coating lacquers and coated testing components
  • Coating of components on behalf of customers
  • Application-oriented characterization of coatings
  • Coatings as corrosion protection, wear protection, surface sealing, heating layer, non-adhesive coating

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Lacquers and Coatings