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Different mixed organic-inorganic gels as precursors for the synthesis of titanium carbide and oxycarbides have been prepared in aqueous and organic solutions starting either from rutile or titanium alkoxide. The sol-gel processes have been controlled by complexing additives such as H 2 O 2 , acetic acid or ethyl aceto-acetate. Upon pyrolysis up to ~600 o C, composites of finely...
Binary organic—inorganic gels, in which a carbonaceous gel obtained from a coal tar pitch and a zirconia gel are combined, were prepared as precursors for carbothermal reduction with and without simultaneous nitridation to form Zr(C,O,N) solid solutions. Zirconium(IV) propoxide as the starting material for zirconia was hydrolyzed in the presence of acetylacetone in order to avoid undesirable precipitation...
Binary hybrid gels consisting of a carbonaceous hydrogel and a silica gel were prepared as preceramic materials. The pyrolytic conversion into carbon-containing glasses under inert conditions were followed by TG analysis, FTIR spectroscopy and nitrogen adsorption. On pyrolysis up to 700 o C, the functional groups of the carbonaceous gel constituent were destroyed and the porosity of the...
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