High temperature oxidation protection for composites

Abstract

A method for coating a composite structure, comprising applying a first slurry onto a surface of the composite structure, wherein the first slurry is a sol gel comprising a metal organic salt, a first carrier fluid, and a ceramic material, and heating the composite structure to a first sol gel temperature sufficient to form a sol gel-derived base layer on the composite structure.

What is claimed is: 
     
         1 . A sol gel for coating a composite structure with an oxidation protection system, comprising:
 a carrier fluid;   a metal organic salt comprising aluminum tri-sec butoxide;   ethanol;   acetic acid;   methanol; and   a ceramic material comprising at least one of a carbide, a boride, or a nitride,   wherein the sol gel is configured to mitigate oxidation of the composite structure.   
     
     
         2 . The sol gel of  claim 1 , wherein the sol gel is substantially free of at least one of phosphate glass or acid aluminum phosphate.