| abstract |
(57) [Summary]nMethods are provided for preparing ceramic precursors from hydridosiloxane starting materials and then pyrolyzing these precursors to produce siliceous ceramic materials. The Si-H bonds present in the hydride siloxane starting material are catalytically activated, and the activated hydrogen atoms can then be replaced with non-hydrogen substituents. These preceramic materials are pyrolyzed in the selected atmosphere to provide the desired ceramic product. Ceramic products that can be prepared in this manner include silica, silicon oxynitride, silicon carbide, metal silicates, and mullite. |