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Stability Characterization of Refractory Materials Under High Velocity Atmospheric Flight Conditions Part 2. Volume 2: Facilities and Techniques Employed for Cold Gas/Hot Wall Tests

Report Number: AFML TR 69-84 Part 2 Volume 2
Author(s): Kaufman, Larry; Nesor, Harvey
Corporate Author: ManLabs Inc.
Laboratory: Air Force Materials Laboratory
Date of Publication: 1969-12
Pages: 66
Contract: AF 33(615)-3859
Project: 7312
Task: 731201
AD Number: AD0864968

The oxidation of refractory borides, graphites, and JT composites, hypereutectic carbide-graphite composites, refractory metals, coated refractory metals, metal oxide composites and iridium coated graphites in air over a wide range of conditions was studied over the spectrum of conditions encountered during reentry or high velocity atmospheric flight as well as those employed in conventional furnace tests. Elucidation of the relationship between hot gas/cold wall (HG/CW) and cold gas/hot wall (CG/HW) surface effects in terms of heat and mass transfer rates at high temperatures is a principal goal. The present report deals with facilities amd techniques employed for performing low velocity CG/HW tests. These techniques include low velocity tests in resistance heated tube furnaces, low-velocity tests of inductively heated samples, and high velocity tests of inductively heated samples. Oxidation exposures performed by these techniques span the temperature range between 1000 and 4200F at flow rates between 0.2 ft/sec and 300 ft/sec. Measurements of the temperature gradients through thin oxide films (10-60 mils thick) indicate that large differences up to 800 F are noted near 3500 F. These results have special significance with regard to interpretation of oxidation measurements and behavior.

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