PNNL

Abstract

This paper describes issues related to using silicon carbide derived from inorganic polymer precursors for joining silicon carbide composites for fusion energy applications. Evolution of gases and shrinkage during processing are identified as critical processes that may control the presence of strength limiting flaws and residual stresses. Precursor composition and structure effect the amount of gaseous species evolved during processing, chemical compatibility with subtrates, and processing environments. Results from the literature and from the authors' investigations are used to illustrate the use of polymer derived material for joining.