Experimental Evaluation of Expanded Pyrolytic Graphite for Use in Space Radiators.

摘要

Expanded pyrolytic graphite was found to be a superior armor-fin material for high performance radiators. Hypervelocity impact tests were performed. An optimum density of 40lb/cu ft was found. The results showed good armor effectiveness and material integrity. Impact tests at 1300F showed little difference from those at room temperature. A final series of tube-armor-fin targets were tested for fin penetration,fin root penetration,and direct impact of a coolant tube. All three objectives were met. By extrapolation to a meteoroid criteria the required armor thickness is only 0.100inches. Plasma spray techniques were developed to apply braze alloys to radiator tube materials preparatory to bonding to the expanded pyrolytic graphite. (Author)