Platinum Metals Rev., 1977, 21, (1), 24
Platinum for High-Temperature Insulation
The properties of platinum have been utilised for a novel application, the thermal insulation of high-temperature systems, in work done by Andrew J. Parker of Hittman Associates Inc. for Goddard Space Flight Centre, Maryland, U.S.A. and outlined in NASA Tech. Briefs, 1976, 1, (1), 74.
In the application, for which platinum was chosen because its high emissivity is stable at temperatures up to over 900°C in both air and vacuum, as well as being resistant to oxidation, forty layers of platinum foil 0.00025 inch thick are arranged as shown in the accompanying figure to form a laminated insulation. By such careful grouping it is possible to produce a linear temperature gradient through the thickness of the insulation.
While cost considerations are likely to restrict the use of platinum for this purpose it is probable that there are situations in the advanced technology industries where its use would be technically and economically viable.