Accession Number:

ADA393848

Title:

Experimental Investigation of Insulating Refractory-Metal Heat-Shield Panels

Descriptive Note:

Technical Note.

Corporate Author:

NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CENTER

Personal Author(s):

• Wichorek, Gregory R.
• Stein, Bland A.

Report Date:

1964-12-01

Pagination or Media Count:

59.0

Abstract:

The results of an experimental study to determine the capabilities and limitations of a thermal protection system utilizing thin-gage, refractory-metal shields are presented. Cyclic radiant-heating tests to 2,4OO F l,589 K were performed on a heat-shield panel with molybdenum-alloy shields coated with a silicide-base coating, and a radiographic technique was used to detect oxidation damage and brittle cracking of the coated shields. A heat-shield panel with columbium-alloy shields was subjected to supersonic flow conditions at a Mach number of 3 and dynamic pressure of l,5OO lbft2 71.8 kNm2. The results of preliminary tests on a prototype panel with nickel-alloy shields subjected to radiant-heating and wind-tunnel conditions are also reported. Evaluation tests on the molybdenum-alloy shield material were made at temperatures ranging from room temperature to 2,9000 F 1,8660 K. Oxidation results and metallurgical studies covering diffusion phenomena for coated molybdenum-alloy coupons and small riveted configurations under continuous and cyclic conditions at temperatures to 2,9000 F are also given.

Descriptors:

• *HEAT SHIELDS
• *HEAT RESISTANT MATERIALS
• *METALLURGY
• *REFRACTORY METAL ALLOYS
• TEMPERATURE
• DAMAGE
• PANELS
• CRACKS
• PROTOTYPES
• CYCLES
• ROOM TEMPERATURE
• COATINGS
• BRITTLENESS
• OXIDATION
• CONFIGURATIONS
• RIVETS
• PROTECTION
• SHIELDING
• NICKEL ALLOYS
• DIFFUSION
• RANGE(EXTREMES)
• SUPERSONIC FLOW
• RADIOGRAPHY
• DYNAMIC PRESSURE
• WIND TUNNELS

Subject Categories:

• Metallurgy and Metallography
• Protective Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE