Ablative Plastics Characterization. Part III. Convective-Radiative Reentry Heating.
Technical rept. 1 Jun 67-30 Apr 68,
AVCO GOVERNMENT PRODUCTS GROUP LOWELL MA AVCO SPACE SYSTEMS DIV
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Methods were sought to improve ablative performance under combined convective-radiative reentry heating. Twenty percent by weight of a particulate filler was used with silicaphenolic, carbonphenolic and low-density charring ablative materials for incident-radiation scattering aluminum, and fluorides of magnesium, calcium, and barium or absorption fluorides of potassium and sodium within the boundary layer, or for surface reflection zirconia. Simplified theoretical analyses aided in the choosing of fillers in the designing of experiments, and in the interpretation of results. Analysis topics included absorption effects on heat of ablation, applicable flight regimes for radiation blocking, and boundary-layer scattering by a precipitated metal oxide. The program established the performance of filled reference materials and relative filler effectiveness for selected laboratory environments. Supporting analyses further defined the potential of material-filler combinations for improving ablative performance under combined convective-radiative reentry heating. Author
- Laminates and Composite Materials
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