Abstract
The reduction of radiant energy transfer through silica by the introduction of aluminum, copper, nickel, and silver powders has been demonstrated by Hunter, Kropschot, Schrodt, and Fulk [1], These authors have reported apparent thermal conductivities, k, as low as 2.0μw/cm-°K for mixtures of fume silica and aluminum powders. This value is about one-tenth of the thermal conductivity of Santocel® A silica aerogel between room and liquid nitrogen temperatures. Mixtures of Santocel A and copper powders with k’s as low as 3.4 μw/cm-oK have been reported by Riede and Wang [2], Details such as particle sizes were not given. Black. Fowle. and Glaser [3] have described carbon-silica mixtures with k’s as low as 4.7 μw/cm-oK. The direct determination of infrared transmittance has been demonstrated by Stoy [4] as a possible screening method for insulating powders and opacifying agents.
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