Methods for dealing with them tend to fall into one of two categories -- either make the ceramic in the desired shape , by reaction `` in situ '' , or by `` forming '' powders into the desired shape , and then sintering to form a solid body .
Methods for dealing with them tend to fall into one of two categories -- either make the ceramic in the desired shape , by reaction in situ , or by `` forming '' powders into the desired shape , and then sintering to form a solid body .