Cryo-mechanical tests of AMES 24E2 IR-black coating

Details Cryo-mechanical tests of AMES 24E2 IR-black coating Cryo-mechanical tests of AMES 24E2 IR-black coating

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1331..241s&link_type=abstract

IN: Stray radiation in optical systems; Proceedings of the Meeting, San Diego, CA, July 12, 13, 1990 (A92-17433 05-74). Bellingh

Other

Adhesion, Antireflection Coatings, Cryogenic Cooling, Infrared Radiation, Strain Rate, Tensile Properties, Aluminum, Deformation, Infrared Telescopes, Liquid Helium, Liquid Nitrogen, Outgassing, Strain Measurement, Vibration Effects

Scientific paper

In addition to the ambient condition tape test, five mechanical tests of the IR-black coating, Ames 24E2, were performed at either liquid helium or liquid nitrogen teperatures. Tensile strain in the coating at liquid nitrogen temperature was measured up to values of 4E-3, both before and after the coating was cycled down to liquid helium temperature. When applied to an aluminum substrate which was then bent in liquid nitrogen, the aluminum substrate always failed (permanently deformed) well before the coating failed. Sinusoidal accelerations up to 45 Gs in liquid nitrogen and 25 Gs in liquid helium did not crack or otherwise visibly damage the coating. Both sinusoidal and random acceleration at about 90 K of a representative baffle vane structure, at frequencies from 10 to 2000 Hz and up to 15 Gs, did not damage the coating, even at the intersection of a baffle with the telescope tube. Thus on a macroscopic level, cryogenic cooling and various levels of acceleration and strain did not affect this coating. However, on a microscopic scale, some loose particles were found associated with several tests. Outgassing data are also given

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