Nano Enhanced 4000 °F CMC for Multiple Use Applications

NASA future applications require non- incremental advances in high temperature materials.nbsp; Specifically, advanced future propulsion systems require significant improvement in the upper temperature operating limit of composite materials.nbsp;Carbon-carbon (C-C) composites exhibit unique properties on increasing strength with temperature but suffer from oxidation at temperatures above 550 C.nbsp; Over the years significant efforts in the oxidation protection ofnbsp;C-C compositesnbsp; included internal inhibition, external coatings and sealants.nbsp;The reliability of such oxidation protection system is greatly limited by the intrinsic risk of coating spallation.nbsp; On the other hand the internal inhibition by itself is incapable of providing sufficient substrate protection at high temperatures without the external coatings.nbsp;Phase I results provided initial paradigm shift into the feasibility of internal oxidation protection system for 3500 F to 4200 F applications.This Phase II builds on very encouraging and insightful Phase I results and provides for a comprehensive, unique molecular level inhibition of the fiber, intrabundle matrix and interbundle matrix.nbsp; System chemistry will be optimized to offer NASA a plethora of opportunities in such demanding applications as extension nozzles and combustors offering max temp operation up to 4,200 F with the material system chemistry and molecular inhibition design enabling the composite based parts to experience very large temperature gradients and providing effective oxidation protection of the substrate.nbsp;nbsp;In short, the uniqueness of this molecular inhibition system, based on Allcomprsquo;s provisional patent, eliminates the need for external coatings and sealants. By the elimination of the external coatings the huge coating spallation reliability problem will be solved offering a paradigm shift applicable not only to NASA propulsion applications but the plethora of other NASA applications, military, and commercial applications.