Adhesive Composition and Method to Join Non-Oxide Silicon Based Ceramic Parts
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Jul 14, 2014
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Jan 26, 2011
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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.
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