Accession Number:

ADA048497

Title:

High Durability Missile Domes.

Descriptive Note:

Interim technical rept. 1 Apr 76-30 Sep 77,

Corporate Author:

RAYTHEON CO WALTHAM MASS RESEARCH DIV

Personal Author(s):

• Gentilman,R.
• Maguire,E.
• Pappis,J.

Report Date:

1977-12-01

Pagination or Media Count:

46.0

Abstract:

Magnesium oxide optical surfaces were protected from degradation due to moisture by any of several sputtered coatings. The coatings are of optical quality and were unaffected by rainfield tests at 256 msec. Highly transparent flat plate samples of polycrystalline magnesium aluminum oxide spinel were fabricated by the fusion casting technique. The best samples have a 21 Al2O3 composition and measure more than 50 mm across and 3 mm thick. Beams of polycrystalline and single crystal alumina-rich spinel were deformed in three-point loading at approximately equal to 1750 C. Applied stresses between 20 and 70 MNsq m produced up to right angle bends, suggesting the feasibility of forging flat plates of spinel into hemispherical dome shapes. Author

Descriptors:

• *AIR TO AIR MISSILES
• *INFRARED DOMES
• *GUIDED MISSILE DOMES
• COST ANALYSIS
• FABRICATION
• VAPOR DEPOSITION
• FORGING
• PROTECTIVE COATINGS
• CASTING
• HEMISPHERES
• AERODYNAMIC HEATING
• FUSION(MELTING)
• THERMAL STRESSES
• RAIN EROSION
• POLYCRYSTALLINE
• CAPTIVE FLIGHT
• SPINEL
• MAGNESIUM OXIDES
• TRANSPARENT PANELS

Subject Categories:

• Air- and Space-Launched Guided Missiles
• Infrared Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE