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Proceedings Paper

Light-absorbing, lightweight beryllium baffle materials
Author(s): Brian W. Murray; Dennis R. Floyd; Eric Ulph
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Paper Abstract

Baffle materials have been fabricated by laying down thick, fine grained Be coatings using magnetron sputtering on formable Be ingot sheet material. Six different coating process variations were used. Three different bias voltage settings (-200 V, -50 V and no bias) were applied to either water cooled or thermally isolated substrates. A 20 percent solution of HF acid in ethanol was used to etch the Be coatings in order to increase light absorption. SEM revealed significant variations in surface morphology of the etched coatings. Acid etching increased the number of light traps in the surface, particularly those below one micrometer in feature size, thus increasing light absorption in the visible region. Specular reflectance measurements from 400 nm to 50 microns revealed that thick coatings laid down with a -50 V bias and etched for one minute produced diffuse, light absorbing baffle surfaces with reflectivities of less that 5 percent, out to 40 microns.

Paper Details

Date Published: 1 September 1991
PDF: 8 pages
Proc. SPIE 1485, Reflective and Refractive Optical Materials for Earth and Space Applications, (1 September 1991); doi: 10.1117/12.46526
Show Author Affiliations
Brian W. Murray, Light Metal Technologies, Inc. (United States)
Dennis R. Floyd, Manufacturing Sciences Corp. (United States)
Eric Ulph, OCA Applied Optics, Inc. (United States)


Published in SPIE Proceedings Vol. 1485:
Reflective and Refractive Optical Materials for Earth and Space Applications
Max J. Riedl; Robert R. Hale; Thomas B. Parsonage, Editor(s)

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