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Additive manufacturing of an AlSi40 mirror coated with electroless nickel for cryogenic space applications
Kampf Telescope Optics GmbH, Alois-Gilg-Weg 7, 81373 Munich, Germany.
Kampf Telescope Optics GmbH, Alois-Gilg-Weg 7, 81373 Munich, Germany.
Kampf Telescope Optics GmbH, Alois-Gilg-Weg 7, 81373 Munich, Germany.
Fraunhofer Institute for Material and Beam Technology, Winterbergstraße 28, Dresden, Germany; Technische Universität Dresden, Helmholtzstr. 7, 01069 Dresden, Germany.
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2018 (English)In: International Conference on Space Optics—ICSO 2018: Chania, Greece 9–12 October 2018 / [ed] Zoran Sodnik; Nikos Karafolas; Bruno Cugny, SPIE - International Society for Optical Engineering, 2018, article id 1118015Conference paper, Published paper (Refereed)
Abstract [en]

Advanced Manufacturing (AM) has the potential to improve existing technologies and applications in terms of performance, light-weighting and costs. In the context of the SME4ALM initiative, launched by DLR and ESA, the company Kampf Telescope Optics GmbH (KTO) in cooperation with the Fraunhofer Institute for Material and Beam Technology (IWS) have assessed the feasibility of AM to build a high-performance optical mirror for space applications. 

For the assessment of the AM potentials, a mirror design concept for cryogenic instruments for observations in the IR and NIR range was baselined. In a second step, Nickel-Phosphorus (NiP) was selected as optical coating. The combination of coating and mirror material is a primary design driver for optical performance. Both materials must have a very similar CTE as well as be compliant to modern optical manufacturing (diamond turning, polishing). As a promising candidate for NiP coating the AlSi40 was selected for the mirror structure. 

The potential advantages of AM for optical mirrors in terms of mechanical performance, cost, and manufacturing time were exploited. The achievement of those objectives was / will be demonstrated by:

1. verifying AM material properties and manufacturability of AM mirrors by material sample tests and subcomponent tests

2. designing AM mirror demonstrator by structural, thermal, and optical performance analysis

3. applying and elaborating AM specific design methods (topology optimization, sandwich structures with internal microstructures, monolithic design, etc.)

4. manufacturing, assembling, and testing AM mirror demonstrator to verify manufacturability and optical performance

5. comparing optical and mechanical performance of the AM mirror demonstrator to a conventional mirror by numerical analysis to exploit potential advantages of AM

Place, publisher, year, edition, pages
SPIE - International Society for Optical Engineering, 2018. article id 1118015
Series
Proceedings of SPIE, E-ISSN 0277-786X ; 11180
Keywords [en]
Additive Manufacturing, AlSi40, optical mirror, cryogenic application, AM specific design
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-86252DOI: 10.1117/12.2535960ISI: 000512543800038Scopus ID: 2-s2.0-85072664650OAI: oai:DiVA.org:ltu-86252DiVA, id: diva2:1577208
Conference
12th International Conference on Space Optics (ICSO 2018), Chania, Greece, October 9-12, 2018
Note

ISBN för värdpublikation: 9781510630772;

Finansiär: ESA GSTP;  Fraunhofer Institute for Material and Beam Technology (IWS) in Dresden

Available from: 2021-07-02 Created: 2021-07-02 Last updated: 2021-07-02Bibliographically approved

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Brueckner, Frank

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