The Boeing Company

Hi-z Technology, Inc.

Velimir Jovanovic

Jim L Wong

John Claude Bass

Saeid Ghamaty

An ablative composition and methods of forming ablative structures are provided that improve char during ablation, prevent combustion during ablation, and which reduce moisture absorption of low temperature ablative (LTA) materials. The ablative composition comprises an intumescent material such as ammonium polyphosphate (APP) that is disposed within an LTA material at the outer surface of the ablative composition. The intumescent material may also be added in increasing amounts throughout the LTA material such that a gradient of intumescent material is formed near the outer surface of the ablative composition for the required amount of thermal protection. Both the LTA material and the intumescent material are applied to a substrate, or an aerospace vehicle structure, preferably in layers using methods such as spray forming or hand troweling.

Intumescent ablative composition

A quantum well thermoelectric module providing very high conversion of heat energy in to electrical energy. In prefered embodiments the module provides electric power for monitoring, measuring or detecting any of a variety of things (such as temperature, smoke, other pollution, flow, fluid level and vibration) and a transmitter for transmitting information measured or detected. In a preferred embodiment wireless monitor systems are utilized to monitor conditions at various locations aboard a ship and to wirelessly transmit information about those conditions to a central location. Preferably, a finned unit is provided to efficiently transfer heat from a module surface to the environment. A preferred quantum well choice is p type BC/BC and n-type Si/SiGe legs. Another preferred choice is n-doped Si/SiGe for the n-legs and p-doped Si/SiGe for the p-legs. At higher temperatures the preferred quantum well legs are alternating layers of silicon and silicon carbide for the n-legs and for the p-legs alternating layers of different stoichiometric forms of B-C.

Growing community of inventors

San Diego, CA, United States of America

Velimir Jovanovic