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1 September 1991 Light-absorbing, lightweight beryllium baffle materials
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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.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Brian W. Murray, Dennis R. Floyd, and Eric Ulph Sr. "Light-absorbing, lightweight beryllium baffle materials", Proc. SPIE 1485, Reflective and Refractive Optical Materials for Earth and Space Applications, (1 September 1991);


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