01/04/2014 · • Phase diagram shows: Mullite (or porcelainite: ), Alumina, and Crystobalite as candidate refractories. Adapted from Fig., Callister 7e. (Fig. is adapted from Klug and Doremus, "Alumina Silica Phase Diagram in the Mullite Region", J. American Ceramic Society 70(10), p. 758, 1987.) Figure shows a simplified ...