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US 4,786,548 AGranted
Low loss radar window for reentry vehicle
AssigneeThe United States of America as represented by the Secretary of the Air Force
InventorThomas M. Place, Jr.
Life of this patent
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Abstract
A radar window for a reentry vehicle where the window is made of a composite material of boron nitride, silica, and boron nitride yarn. Silica in the range of 2 to 18 percent is the preferred range in the composite material and the boron nitride matrix ranges from 5 to 15 percent.
Claims5
A composite material for use in a radar window of a reentry vehicle, said vehicle being exposed to temperatures in excess of 2200.degree. C. upon reentry, said composite material comprising:
- a yarn of boron nitride, said yarn woven in a selective pattern to form a preform;
- boron nitride, said boron nitride impregnated throughout said preform to form a matrix composite;
- and
- silica, said silica being impregnated throughout said matrix composite, said silica being about 2 to about 20 weight percent of said composite material;
- whereby said composite material is substantially recession matched to a surrounding surface of tape-wrapped carbon phenolic materials.
2 more elements
Dependencies are inferred from the claim text.