Sri International

United States of America As Represented by the Administrator of Nasa

Osaka Gas Company Limited

Michael I Gusman

Sylvia M Johnson

Angel Sanjurjo

Yigal Dov Blum

David J Rowcliffe

John W Lawson

Robert Lamoreaux

Thomas H Squire

Hajime Nakano

Gopala Krishnan

Gilbert Tong

A thermal protection system (TPS) comprising a mixture of silicon carbide and SiOthat has been converted from Si that is present in a collection of diatom frustules and at least one diatom has quasi-periodic pore-to-pore separation distance d(p-p) in a selected range. Where a heat shield comprising the converted SiC/SiOfrustules receives radiation, associated with atmospheric (re)entry, a portion of this radiation is reflected so that radiation loading of the heat shield is reduced.

Biologically inspired radiation reflector

A method is provided for preparing ceramic precursors from hydridosiloxane starting materials and then pyrolyzing these precursors to give rise to silicious ceramic materials. Si--H bonds present in the hydridosiloxane starting materials are catalytically activated, and the activated hydrogen atoms may then be replaced with nonhydrogen substituents. These preceramic materials are pyrolyzed in a selected atmosphere to give the desired ceramic product. Ceramic products which may be prepared by this technique include silica, silicon oxynitride, silicon carbide, metal silicates, and mullite.

Hydridosiloxanes as precursors to ceramic products

The present invention relates to an improved process to produce an essentially carbon-free nitrate of an alkali metal, alkaline earth metal, transition metal, lanthanide metal, actinide metal, metal, or mixtures thereof, which process comprises:

Carbonate-free inorganic nitrates or oxides and process thereof

The present invention pertains to a method of preparing particles of superconducting ceramic powders, which method comprises:

Cryochemical method of preparing ultrafine particles of high-purity

Production of carbide shapes of silicon, titanium or vanadium by reaction of carbon with the metal in liquid phase such being carried out by heating a mixture of particles of carbon and particles of the metal rapidly to the melting point of the metal, thereby minimizing solid state reaction, and holding at a temperature and for a time sufficient to cause reaction. The metal and carbon particles are about 0.05 to 10 mm in diameter. An organic binder is used which volatilizes or dissociates upon heating.

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Palo Alto, CA, United States of America

Michael I Gusman