Ablative Materials for High Heat Loads. Part II. Heterocyclic Resins, Layered Composites, Elastomers, and Filament Wound Composites.

摘要

Ablative plastic composite materials were investigated and developed for long time heating environments. The desirable materials performance goals were low surface ablation, insulative ability, and low weight without asymmetrical ablation, char instability, spallation or other thermomechanical effects. The candidate materials consisted of carbon, quartz, and silica cloth reinforced polyimide resin; loom woven, low density quartz (LDQ) INSULATIVE LAYERS USING POLYIMIDE RESIN; CARBON-QUARTZ BIFILAMENT TAPE REINFORCED PHENOLIC RESIN; FILLED ABLATIVE SILICONE ELASTOMERS; AND A MULTIPLE INTERLOCK, FILAMENT WOUND CARBON FILAMENT REINFORCED PHENOLIC RESIN CYLINDER. Candidate materials and reference carbon and silica cloth reinforced phenolic resinous composites were evaluated. Polyimide resin composites were generally comparable to the reference materials. LDQ proved an effective light weight insulator when used between a heat shield and aluminum structure. Outstanding carbon-quartz bifilament tape performance was obtained, but the results could not be adequately reproduced. There were no attractive performance features for the two remaining concepts. An analytical study was made of materials response and to confirm experimental results. Good agreement was generally found between analytical and experimental results for carbon cloth reinforced phenolic resin and other composites. (Author, modified-PL)