ADL-4D6: A Silica/Silica Composite for Hardened Antenna Windows.

摘要: Abstract : A silica/silica composite designated 'ADL-4D6' has been developed at GE/RESD for advanced missile shock-resistant antenna window applications. It is based on RESD's 'Omniweave' 4-D reinforcement system using high purity fused silica fibers, densified to 1.6 gm/cc by repeated infiltration with an aqueous suspension of colloidal silica. This paper describes improved fabrication process, from both the performance and cost standpoint, summarizes mechanical, thermal electrical design data. The results flyer plate testing show a spall threshold 7300-8000 taps 1 inch thickness, highest resistance (hardening) any known inorganic dielectric material. Minimum flexure strenghts 5000 psi 1.0% strain failure have achieved. ADL-4D6 can thus be considered 'ductile' ceramic'. (Author)