Advanced Hardened Antenna Window Materials Study. III.
Final rept. 19 May 72-19 Apr 73,
GENERAL ELECTRIC CO PHILADELPHIA PA RE-ENTRY AND ENVIRONMENTAL SYSTEMS DIV
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The development and characterization of the ADL-10 composite hardened antenna window fused silica Omniweave reinforcementSR-350 methyl silicone resin matrix was completed. A variety of methods for densification of silica Omniweaves to inorganic RF transmitting composites was studied and compared. These included multiple impregnations and pyrolyses with SR-350 the Markite process, pyrolysis of a silane resin, densification with Ludox colloidal silica sols, chemical vapor deposition of silica and boron nitride, and a series of glass-bonded boron nitride matrices. Two of these approaches yielded promising composites ADL-4D6, from the colloidal silica matrix in both a 4-D and 5-D reinforcement design and BNQ, the glass-bonded boron nitride matrix composite with 4-D Omniweave. The report contains data on flexure and tensile strengths and elastic properties, flyer plate shock impact testing by both aluminum and mylar flyers, RFdielectrics, ultrasonic and radiographic NDT, thermal conductivity and ablation testing. An analytic section compares the structural properties of 3-D, 4-D and 5-D composites of silica-silica and silica-silicone. Modified author abstract
- Electrical and Electronic Equipment
- Laminates and Composite Materials
- Guided Missile Reentry Vehicles