High Durability Missile Domes.

Authors: R. Gentilman; E. Maguire; J. Pappis; RAYTHEON CO WALTHAM MASS RESEARCH DIV

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 m/sec. Highly transparent flat plate samples of polycrystalline magnesium aluminum oxide (spinel) were fabricated by the fusion casting technique. The best samples have a 2:1 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 MN/sq m produced up to right angle bends, suggesting the feasibility of forging flat plates of spinel into hemispherical dome shapes. (Author)

Description:

Interim technical rept. 1 Apr 76-30 Sep 77

Pages:

Report Date:

DEC 1977

Contract Number:

N0001476C0635

Report Number:

A794840

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