Accession Number : AD0768225

Title :   Advanced Hardened Antenna Window Materials Study. III.

Descriptive Note : Final rept. 19 May 72-19 Apr 73,

Corporate Author : GENERAL ELECTRIC CO PHILADELPHIA PA RE-ENTRY AND ENVIRONMENTAL SYSTEMS DIV

Personal Author(s) : Brazel,James P.

Report Date : JUL 1973

Pagination or Media Count : 253

Abstract : The development and characterization of the ADL-10 composite hardened antenna window (fused silica Omniweave) reinforcement/SR-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, RF/dielectrics, 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)

Descriptors :   (*COMPOSITE MATERIALS, HARDENING), (*GUIDED MISSILE WINDOWS, *GUIDED MISSILE ANTENNAS), REENTRY VEHICLES, HEAT SHIELDS, QUARTZ, SILICON DIOXIDE, SILANES, BORON COMPOUNDS, NITRIDES, SILICONE PLASTICS, PYROLYSIS, RADIO TRANSMISSION, MECHANICAL PROPERTIES, ANTENNA COMPONENTS, DEPOSITION, CERAMIC FIBERS

Subject Categories : Electrical and Electronic Equipment
      Laminates and Composite Materials
      Guided Missile Reentry Vehicles

Distribution Statement : APPROVED FOR PUBLIC RELEASE