Open Access Paper
20 November 2017 Si3N4 ceramic application for large telescope development results
Christophe Devilliers, Thierry Lasic, David Boban, Laurence Cornillon, Dima Tanzilli, Sonia Aitzaid, Karl Berroth
Author Affiliations +
Proceedings Volume 10564, International Conference on Space Optics — ICSO 2012; 1056412 (2017) https://doi.org/10.1117/12.2309145
Event: International Conference on Space Optics 2012, 2012, Ajaccio, Corsica, France
Abstract
Thales-Alenia-Space has identified the ceramic Si3N4 as an interesting material for the manufacturing of stiff , stable and lightweight truss structure for future large telescopes. Si3N4 ceramic made by FCT has been selected for its own intrinsic properties (high specific Young modulus, low CTE, very high intrinsic strength for a ceramics) and its cost effective beams manufacturing capabilities.

In order to qualify beam and beams end fittings for future large and thermo-elastical stable truss structure for space telescope, full development and tests activities have been performed. Manufacturing process has been optimized in order to obtain a very high reliable strength.

Full scale beams with thin wall have been manufactured and tested in bending and in tension. Full scale beam assembly with integrated junctions have been manufactured and tested up to ultimate loads and have been space qualified.

Beams end fittings made also in Si3N4 and its direct bolting capabilities have been also space qualified by tests.

Beside this qualification for current space telescope, developments are continuing thank to CNES R&T to develop high loaded brazed junction between Si3N4 parts, enhanced thermal conductivity and mechanical strength through Si3N4 formulation and manufacturing process tuning.
© (2017) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Christophe Devilliers, Thierry Lasic, David Boban, Laurence Cornillon, Dima Tanzilli, Sonia Aitzaid, and Karl Berroth "Si3N4 ceramic application for large telescope development results", Proc. SPIE 10564, International Conference on Space Optics — ICSO 2012, 1056412 (20 November 2017); https://doi.org/10.1117/12.2309145
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