Abstract: The present invention comprises an adhesive composition and a method of using the composition to join non-oxide, silicon-based ceramic parts. The composition is a non-aqueous paste comprising high levels of non-oxide powders, silicon carbide or silicon nitride powder blended with a mixture of polymeric precursors to silicon carbide and zirconium boride. The resulting blend of the present invention is capable of decomposing on heating (in an inert or reducing atmosphere) into Si-based ceramic phases. The powder is fully suspended and dispersed in the polymer such that pockets of dry powder are not present. Although the polymer penetrates between particles and wets the surfaces to be joined, it does not prevent some contact between particles and the surface. Because the paste contains only low levels of volatile solvents and it converts into Si-based ceramics upon pyrolysis, it provides strong chemical bonding to Si-based ceramics.

Abstract: There are disclosed inventions relating to tubular hybrid metal/ceramic composites and the methods of making them wherein the ceramic chosen has a lower thermal expansion than that of the metal.

Abstract: There are disclosed inventions relating to tubular hybrid metal/ceramic composites and the methods of making them wherein the ceramic chosen has a lower thermal expansion than that of the metal.

Abstract: A method of making a ceramic composite wherein a polymeric ceramic precursor or fiber reinforcement infiltrated with a polymeric ceramic precursor is associated with at least one metallic element to form a preceramic composite and the said composite is pyrolyzed by high frequency microwave radiation, preferably in the form of a beam, until the polymeric ceramic precursor is converted into a ceramic having the at least one metallic element integrally formed as part of said ceramic. The products obtained by such method comprising ceramic metal composites formed by pyrolyzing a preceramic composite to high frequency microwave radiation until the polymeric ceramic precursor is converted into a ceramic having at least one metallic element integrally formed as a part of said component.