Accession Number : ADA307485

Title :   Thermophysical Properties of Six Charring Ablators from 140 deg to 700 deg K and Two Chars from 800 deg to 3000 deg K.

Descriptive Note : Technical note,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER

Personal Author(s) : Wilson, R. G.

PDF Url : ADA307485

Report Date : OCT 1965

Pagination or Media Count : 176

Abstract : Thermophysical property data of the type necessary for the performance analysis and design of entry heat-shields are presented for several ablation materials over the temperature range from -200 deg to 5000 deg F (144 deg to 3030 deg K). The data include enthalpy, specific heat, thermal conductivity, thermal expansion, density, and tensile and compressive mechanical properties of six ablation materials over the temperature range from -200 deg to 800 deg F (144 deg to 700 deg K). The enthalpy, specific heat, thermal conductivity, and total normal emittance of the chars formed from thermal degradation of two of the materials are also included. The char properties were measured over the temperature range from 1000 deg to 5000 deg F (810 deg to 3030 deg K). The materials studied are a high-density phenolic-nylon, a low-density phenolic-nylon, a filled silicone resin, the filled silicone resin in honeycomb, a carbon-fiber-reinforced phenolic, and a low-density filled epoxy in honeycomb. The first four materials were formulated and fabricated at the NASA Langley Research Center. The last two are commercially produced materials - Narmco 4028 and Avcoat 5026-39-HC G. The chars studied were produced from the high- and low-density phenolic-nylon materials.

Descriptors :   *ABLATIVE MATERIALS, *CHARRING, *THERMOPHYSICAL PROPERTIES, TEMPERATURE, MECHANICAL PROPERTIES, PERFORMANCE TESTS, MATERIALS, POLYMERS, TENSILE PROPERTIES, NYLON, EMITTANCE, THERMAL EXPANSION, THERMAL CONDUCTIVITY, HIGH DENSITY, HEAT SHIELDS, LOW DENSITY, ENTHALPY, THERMAL DEGRADATION, SPECIFIC HEAT, FILLING, SILICONES, COMPRESSIVE PROPERTIES, PHENOLIC PLASTICS.

Subject Categories : Miscellaneous Materials
      Polymer Chemistry
      Plastics
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE