Stresses occurring during joining of ceramics using preceramic polymers

This paper reviews the current literature and describes issues related to u sing preceramic polymer precursors for joining ceramics for high-temperatur e applications. In particular, the effects of precursor yield, temperature, and heating rate on the maximum stress due to shrinkage associated with co nversion of preceramic precursors to covalently bonded network structures a re discussed. Conditions where the joint material viscosity and the shrinka ge rates are high must be avoided. Fillers and prepyrolysis of the precurso r can be used to decrease the stresses that occur during processing of join ts.