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    Breaking News

    Fraunhofer Institute, Sirris Investigate Technical Coatings for Additive Manufacturing

    Report lacquering and polishing as most efficient technique for surface optimization.

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    12.03.18
    In a joint project, researchers from the Belgian NPO Sirris and the Fraunhofer Institute for Applied Polymer Research IAP have investigated technical coatings for additive manufacturing with promising results.
     
    AM describes the construction of an object layer by layer using a 3D-model. The technologies vary but 3D printing is probably the best known. However, selective laser sintering, stereolithography or material jetting play important roles in the AM market. 
     
    While the first AM technologies were developed for rapid prototyping, today, AM is taking the leap into industrial production. It is one of the important future technologies that will influence the manufacturing market and beyond. 
     
    The industry can profit from AM with its production-on-demand capabilities, its and flexible adaptability and the possibility to produce small quantities. However, the surface of the fabricated components is usually very rough and porous. 


     
    To meet this challenge, two partners investigated technical coatings for additive manufacturing in a joint project. Sirris is an organization focused on finding solutions for technological challenges, usually in projects with universities, research centers, companies, associations and other institutions. Researchers at the Fraunhofer IAP, among other areas of expertise, have many years of experience in technical coatings. 


     
    “Today, with the transition from rapid prototyping to industrial production, the demands on AM-manufactured components are growing. Being able to warrant consistent material quality is essential for industry producers. In addition, demands on the surface quality are growing,” said Dr. Andreas Holländer, expert in surface technology at the Fraunhofer IAP.



     
    Technical Coatings enable smooth and sealed surfaces with specific functions


    With technical coatings, the Sirris and Fraunhofer researchers were able to significantly improve AM-produced parts regarding surface roughness and porosity. It turned out that the combination of lacquering and polishing is the most efficient technique for surface optimization in AM. In addition, components can be functionalized further by using special lacquers or surface treatments. In the current project, the scientists metallized the smoothed components. The metal coating is a visible example for the functionalization process. Improved scratch resistance, antimicrobial properties and many more features are applicable.
     
    

Sirris provided different components made with SLS, SLA, MJ, and FDM (fused deposition modeling = 3D printing). All methods pose different challenges to surface treatment.
     
    

"With years of expertise in surface treatment, we are able to meet a wide range of requirements. We analyzed each part in the first step to determine the specific properties. Afterwards we were able to activate, paint, and polish and, in this case, metallize the respective surface with the appropriate method," said Holländer, who leads the research group at the Fraunhofer IAP.


     
    "If we only polish our finished components, it takes a long time, and especially with fine, detailed features, we change their shape. It comes to abrasion, which we want to avoid. With the Fraunhofer IAP we have developed possibilities to overcome the current problems, especially the porous and rough surface, in additive manufacturing," added Patrick Coesmans of Sirris Flanders.
     
    


Is combining AM with established technologies the future?
    Conventional production methods often reach their limits with complex components. The more complex a component, the more difficult and expensive it becomes in conventional production. AM opens up possibilities to produce complex components faster and more cost-efficiently. With AM, a component that would conventionally consist of many individual parts and would have to be assembled can be created in one step.


     
    "It is important," Dr. Holländer said, "that every part of the component’s surface has the required quality. In complicated parts, some surfaces are difficult to reach. With the appropriate surface treatment technology, which in future will even be integrated into the AM machines, we are able to functionalize even complex components completely."


     
    Finishing the project both partners conclude that AM in combination with established technologies provides even better capabilities and more possible applications than AM alone.


    Complex AM-fabricated parts dry after their metallization. © Fraunhofer IAP 
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