caa a22 4500 606244883 CHVBK 20210128101332.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s12567-015-0073-5 doi (NATIONALLICENCE)springer-10.1007/s12567-015-0073-5 Demonstration and challenges for joining technology based on direct bonding usable for construction of (large) structures in space [Elektronische Daten] [Hartmut Fischer, Edwin Gelinck, Christopher Semprimoschnig, Marc van Munster, John van der Heijden] A direct bonding process relying on van der Waals forces offers an ideal combination of easiness to assemble and material compatibility. Such a bonding procedure, also denoted as optical bonding, is already known and used frequently in different applications. However, there are strict requirements to achieve optical bonding: (1) a high level of cleanliness of the surfaces and (2) low roughness (RMS roughness <2nm and preferably <0.5nm). The first condition will be possible to realize in space, since the vacuum prevents the absorption of a thin water layer present on all surfaces under atmospheric conditions and forces a desorption of all residual water. Also, particle contamination will be minimized, due to the absence of strong capillary forces which attract particles if present and the absence of particles in space, providing a suitable and without residue removable protection prior to bonding. The second condition is now state of the art of silicon carbide (SiC) polishing and can hence be realized. While meeting the requirements, theoretically very large adhesion forces can be realized in vacuum. Surfaces have been polished according to the requirements. The forces measured on these surfaces are nearly as high as theoretically predicted and demonstrate the proof of principle of direct bonding of SiC under ambient conditions and in vacuum. However, the realization of the required flatness over large contact areas is still a challenge. Furthermore, since the surfaces display a really low roughness, extremely clean handling and bonding conditions need to be realized to avoid the spontaneous adhesion of small particles which would as such prevent direct bonding of larger areas. CEAS, 2015 Silicon carbide nationallicence Direct bonding nationallicence Adhesion nationallicence Construction in space nationallicence Fischer Hartmut TNO Technical Sciences, De Rondom 1, 5612 AP, Eindhoven, The Netherlands aut Gelinck Edwin TNO Technical Sciences, De Rondom 1, 5612 AP, Eindhoven, The Netherlands aut Semprimoschnig Christopher Materials Space Evaluation and Radiation Effects Section, ESA-ESTEC, Keplerlaan 1, PO BOX 299, 2200 AG, Noordwijk, The Netherlands aut van Munster Marc Xycarb Ceramics B.V., Zuiddijk 4, 5705 CS, Helmond, The Netherlands aut van der Heijden John Xycarb Ceramics B.V., Zuiddijk 4, 5705 CS, Helmond, The Netherlands aut CEAS Space Journal Springer Vienna 7/1(2015-03-01), 3-10 1868-2502 7:1<3 2015 7 12567 https://doi.org/10.1007/s12567-015-0073-5 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s12567-015-0073-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fischer Hartmut TNO Technical Sciences, De Rondom 1, 5612 AP, Eindhoven, The Netherlands aut NATIONALLICENCE 700 1- Gelinck Edwin TNO Technical Sciences, De Rondom 1, 5612 AP, Eindhoven, The Netherlands aut NATIONALLICENCE 700 1- Semprimoschnig Christopher Materials Space Evaluation and Radiation Effects Section, ESA-ESTEC, Keplerlaan 1, PO BOX 299, 2200 AG, Noordwijk, The Netherlands aut NATIONALLICENCE 700 1- van Munster Marc Xycarb Ceramics B.V., Zuiddijk 4, 5705 CS, Helmond, The Netherlands aut NATIONALLICENCE 700 1- van der Heijden John Xycarb Ceramics B.V., Zuiddijk 4, 5705 CS, Helmond, The Netherlands aut NATIONALLICENCE 773 0- CEAS Space Journal Springer Vienna 7/1(2015-03-01), 3-10 1868-2502 7:1<3 2015 7 12567