Accession Number : AD0476882


Title :   ABLATIVE PLASTIC CHARACTERIZATION IN SIMULATED MOTOR EXHAUST


Descriptive Note : Annual summary rept. no. 1, 15 Jun 1964-30 Jun 1965


Corporate Author : PHILCO NEWPORT BEACH CA AERONUTRONIC DIV


Personal Author(s) : Mayo, C S ; Ostrow, S L ; Marcus, R E


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/476882.pdf


Report Date : Jul 1965


Pagination or Media Count : 307


Abstract : New chemical compositions and physical constructions of ablative material were exposed in a small scale, hig2 temperature Aeronutronic solid propellant rocket motor simulator and a liquid propellant (nitrogen tetroxide - 50 percent hydrazine and 50 percent unsymmetrical dimethylhydrazine) combustion gas environment to determine the potential usefulness of these materials for hyperenvironmental conditions associated with current and future solid dand liquid propellant motors. Material erosion and thermal insulation characteristics of the research nozzles were evaluated by comparisons of chamber pressure versus time data, erosion and resin degradation rates, and visual photographic data. Research nozzle specimens were exposed in two (2) groups to the exhaust environment of a simulated solid propellant having a flame temperature of 5800 F and being highly aluminized. Test Series 1 contained thirth (30) nozzle specimens and Test Series 2 contained twenty-four (24) specimens. Test results and preliminary specimen evaluation indicated that the Aeronutronic solid propellant simulator exhaust environment provided the specified exhaust environment with the required repeatable test screening characteristics to enable valid material evaluations. A total of seventy (70) nozzles were exposed to the exhaust environment of the liquid rocket motor (NTO/ 50-50). Several new ablative plastic composites were found to have ablative performance characteristics superior to the state-of-the-art carbon-phenolic and silica-phenolic composites.


Descriptors :   *ROCKET NOZZLES , *COMPOSITE MATERIALS , HYDRAZINES , GRAPHITE , CARBON , COATINGS , EROSION , PRESSURE , TABLES(DATA) , FLAMES , TEXTILES , PLASTICS , LIQUID ROCKET PROPELLANTS , METHYL HYDRAZINES , PYROLYTIC GRAPHITE , SOLID ROCKET PROPELLANTS , THERMAL INSULATION , PHENOLIC PLASTICS , NITROGEN COMPOUNDS , EXHAUST GASES , TETROXIDES , ABLATION , TEMPERATURE


Subject Categories : Laminates and Composite Materials
      Rocket Engines
      Rocket Propellants


Distribution Statement : APPROVED FOR PUBLIC RELEASE