"Composite materials." . . "Panels." . . "Reentry vehicles." . . "Unmanned Spacecraft." . . "Emissivity." . . "Nickel alloys." . . "Tungsten alloys." . . "Cobalt alloys." . . . . "Heat resistant metals." . . "Measurement." . . "Heat shields." . . "Structural Engineering and Building Technology." . . "Thermal conductivity." . . . . . . . . . . . . . . . . . "Heat transfer in structural honeycomb composites at high temperatures"@en . . . . . . . . "The use of superalloy and refractory alloy honeycomb composites for heat shield and structural components in re-entry vehicle applications is outlined followed by a detailed comparison between experimentally measured and analytically predicted thermal conductance values on superalloy honeycomb composites. The experimental thermal conductance determinations on L-605 cobalt alloy panels of variable geometry were made in high vacuum and air environments using a high temperature absolute thermal conductivity apparatus. Measurements were made over the range from 500 to 2000 F maintaining the temperature drop across the specimens below 200 F. Average precision of the results was plus or minus 7% while the accuracy was established to be plus or minus 10% based on initial calibration. The thermal conductances in air environment were between 60 and 100% above comparable values for the panels tested under vacuum conditions. Analysis of the results indicated that gaseous conduction and convection accounted for only a small fraction of the difference, the main effect being a large increase in the radiative contribution produced by increased emittance of the alloy through surface oxidation."@en . . . "Chromium alloys." . . "High temperature." . . "Sandwich panels." . . "Honeycomb cores." . . "Ceramic materials." . . "Heat transfer." . . "AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OH." . . "Heat resistant alloys." . .