A PROCESS OF FREEZING AN INORGANIC PARTICULATE SLURRY OR SUSPENSION

摘要

A process of freezing an inorganic particulate slurry or suspension containing a freeze sensitive colloidal ceramic sol which comprises supercooling the slurry in a freezing media and then freezing the slurry to cause spontaneous nucleation resulting in the formation of a very large number of ice crystals that are consequently very small thus producing a ceramic structure that is very uniform throughout is disclosed. According to one aspect the invention includes the addition of lithium ions to the freezing media with or without supercooling. Also composite ceramic structures composed of a laminate of at least two different fired ceramic bodies in which at least one ceramic body material has a different coefficient of expansion from at least one other wherein each ceramic body are disclosed.