Accession Number:

AD0832039

Title:

HIGH-STRENGTH, BROADBAND, LIGHTWEIGHT SILICON OXIDE RADOME TECHNIQUES

Descriptive Note:

Summary rept. no. 1, 1 Mar 1967-29 Feb 1968

Corporate Author:

GEORGIA INST OF TECH ATLANTA ENGINEERING EXPERIMENT STATION

Personal Author(s):

• Harris, Joe N.
• Bomar, Jr., Steve H.
• Welsh, Earle A.

Report Date:

1968-04-01

Pagination or Media Count:

79.0

Abstract:

Development of low and high density, high strength, amorphous silica for the construction of A-sandwich radomes is discussed. Techniques are described for forming low density, high strength structures by filament winding, slip-casting of honeycomb structures, and foaming of ultra-high purity amorphous silica. High density structures were slip-cast from a high purity slip formed by consolidation and subsequent ball milling of Cab-O-Sil, a synthetic amorphous silica fluff. The elastic modulus of the low density material was increased to 1.5 times that available from commercial fused silicas. Densities of 98 per cent of theoretical and elastic moduli of 9 x 10 to the 6th power psi, approximately twice that attainable with commercial slip-cast fused silica, were achieved with the high density material. Firing times of 60 hours at 2200F were possible without excessive cristobalite formation in the high purity silica as compared with 3 to 4 hours which was the maximum sintering time for commercial fused silicas without excessive devitrification.

Descriptors:

• *RADOMES
• FIBER METALLURGY
• MECHANICAL PROPERTIES
• MANUFACTURING
• HIGH TEMPERATURE
• TENSILE PROPERTIES
• CRYSTALLIZATION
• IMPURITIES
• DIELECTRIC PROPERTIES
• SILICON COMPOUNDS
• STRUCTURAL COMPONENTS
• THERMAL SHOCK
• FOAM
• SINTERING
• HONEYCOMB CORES
• BALL MILLS
• SLIP CASTING
• THERMAL PROPERTIES
• PARTICLE SIZE

Subject Categories:

• Manufacturing and Industrial Engineering and Control of Production Systems
• Active and Passive Radar Detection and Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE