Accession Number:

AD0258762

Title:

INVESTIGATIONS OF THE DETERIORATION OF 22 REFRACTORY MATERIALS IN A MACH NUMBER 2 JET AT A STAGNATION TEMPERATURE OF 3,800 F

Descriptive Note:

Corporate Author:

NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON D C

Personal Author(s):

• LEWIS,B.W.

Report Date:

1961-06-01

Pagination or Media Count:

1.0

Abstract:

A limited investigation of the deterioration characteristics of 22 refractory materials was conducted by exposing them to a stagnation temperature of 3,800 F in a Mach number 2 ceramicheated jet. The materials tested were 6 materials whose major constituent was SiC, 5 cermets whose major constituent was TiC, 6 materials whose major constituents were metal borides, 4 cermets containing alumina, and 1 silicon nitride model. Tests consisted of obtaining weight change and appearance changes for 12-inch-diameter hemispherical-nose cylindrical models exposed to the air jet for 30 sec at a time for a total of 4 runs or 2 min. exposure. It was concluded that only those materials which changed in weight the least cound be recommended for further extensive application-oriented evaluations. The following materials fell in this category SiC - Si, Cr - 28 alumina cermet, titanium boride - 5 B4C. The remainder of the materials tested had oxidation characteristics which appeared to be too severely limiting of their general applications to flight vehicles. Author

Descriptors:

• *DEGRADATION
• *HIGH TEMPERATURE
• *REENTRY VEHICLES
• BORIDES
• CARBIDES
• CHROMIUM
• HYPERSONIC VEHICLES
• JET FLOW
• METAL COMPOUNDS
• NITRIDES
• OXIDATION
• OXIDES
• ROCKET NOSES
• SILICON COMPOUNDS
• SUPERSONIC FLOW
• SURFACES
• TEST METHODS
• TITANIUM COMPOUNDS

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE