Accession Number : ADA309498

Title :   Investigation of Resin Systems for Improved Ablative Materials.

Descriptive Note : Final rept. 2 Jul 66-12 Apr 68,

Corporate Author : TRW SYSTEMS GROUP REDONDO BEACH CA

Personal Author(s) : Burns, E. A. ; Lubowitz, H. R. ; Jones, J. F.

PDF Url : ADA309498

Report Date : 01 OCT 1968

Pagination or Media Count : 164

Abstract : This final report describes the work performed to advance the state of the art of resin matrices required for improved ablative materials for use with high energy fluorine containing liquid propellant systems. This experimental program was a continuation of a previously reported effort (NASA CR-54471) and consisted of a systematic materials development effort of resin synthesis and property determination of new and previously identified resin systems, optimization of composite processing parameters and fabrication and use testing of candidate ablative composites. Two new high char forming polymer systems were synthesized, fabricated and evaluated in composite form for ablative use effectiveness. These aromatic/heterocyclic polymer systems were designed to be processed readily with the evolution of minimum quantity of volatile matter during cure. As a consequence, low void, high strength composites were prepared which exhibited ablative performance (combination of dimensional stability, weight retention and resistance to thermal shock) superior to commercially available ablative materials when tested in a FLOX/methane torch combustion environment. Tested composites were prepared using Refrasil, graphite and carbon cloth and titanium diboride fibrous reinforcements.

Descriptors :   *THERMOPLASTIC RESINS, *ABLATIVE MATERIALS, ABLATION, OPTIMIZATION, PARAMETERS, FIBER REINFORCED COMPOSITES, SYNTHESIS(CHEMISTRY), THERMAL STABILITY, GRAPHITE, CARBON FIBERS, HIGH STRENGTH, FLUORINE, VOLATILITY, LIQUID PROPELLANTS, TITANIUM BORIDE, THERMAL SHOCK, HETEROCYCLIC COMPOUNDS.

Subject Categories : Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE