Lightweight, Oxidation-Resistant CwSixOyBz Ceramics

Lightweight, monolithic ceramics that retain their shapes and strengths and resist oxidation at temperatures up to 1,200 °C have been invented. These ceramics are made of carbon, silicon, oxygen, and boron. These ceramics are made by (1) using a sol-gel process to infiltrate noncarbon ingredients into lightweight, porous carbon preforms; then (2) pyrolizing the infiltrated preforms.