Accession Number : AD0286066

Title :   EVALUATION OF HYPERSONIC PROBE MATERIALS IN A WATER-STABILIZED ELECTRIC ARC AT TEMPERATURES TO 3200 C (5795 F) FOR 60 SECONDS

Corporate Author : ARMY RESEARCH OFFICE WASHINGTON D C

Personal Author(s) : MOLELLA,D.J.

Report Date : DEC 1962

Pagination or Media Count : 1

Abstract : Mach 8.5 pressure probes were tested to evaluate their behavior during re-entry trajectory heating conditions. A water-stabilized electric arc was used to simulate re-entry heat input of 450 BTU/sq ft-sec to be reached in 25 second . Duration of test was 60 seconds. O UT OF !< COATINGS TESTED ON Mo, a sprayed coating of 90W+10ZrO2 exhibited the least damage. Other coatings, AlCr-Si, MoSi2, gradated ZrO2 and ZrB2 protected the Mo against atastrophic oxidation. Out of 3 coatings tested on graphite, a vapor-deposited, SiC coating on graphite showed the least damage. American Lava Corp coating and a 90W+10ZrO2, sprayed coating eroded but still protected the graphite against oxidation. Among 8 uncoated materials tested, W and SiC exhibited the least damage. Graphite eroded moderately, however, Mo oxidized catastrophically. (Author)

Descriptors :   *COATINGS, *ELECTRIC ARCS, *HYPERSONIC CHARACTERISTICS, *REFRACTORY MATERIALS, ALLOYS, ALUMINUM ALLOYS, BORIDES, CARBIDES, CHROMIUM ALLOYS, GRAPHITE, HEAT, HIGH TEMPERATURE, MOLYBDENUM, OXIDATION, OXIDES, SILICIDES, SILICON ALLOYS, SURFACE TEMPERATURE, THERMODYNAMICS, TUNGSTEN ALLOYS, WATER, ZIRCONIUM ALLOYS, ZIRCONIUM COMPOUNDS

Distribution Statement : APPROVED FOR PUBLIC RELEASE