EVALUATION OF MATERIALS FOR USE IN ELECTRONIC SYSTEMS OF HYPERSONIC SPEED VEHICLES
GENERAL DYNAMICS CORP FORT WORTH TX
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Five combinations of ceramic insulated wires and coatings were exposed to 700 F for 10 hours. The Teflon resin sealed ceramic insulated wire exhibited satisfactory dielectric strengths after aging and after humidity exposure, and was capable of being formed into 2 D bends. Four elastomeric and one ceramic potting compounds were molded into test specimens, and then aged for 10 hours at 700 F. Volume change and evidence of reversion were determined. Although the elastomeric compounds exhibited severe deterioration, one compound, G. E. RTV-60, retained its elastomeric properties. The ceramic compound, Durock 0307 was essentially unaffected by temperature but showed hydroscopic tendencies. Twenty five elastomers were aged for varying periods of time at 700 F. The effect of heat was determined on the R.T. tensile strength, elongation and hardness properties. Although, none of the compounds were suitable for test after 10 hours at 700 F, six had measurable properties after aging 7 hours at 700 F.
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