ABSTRACT
On the basis of various methods of synthesis of precursors, and their phase transformation studies, maximum possible routes of mullitization processes are needed to ascertain. The phase transformation of this gel on the due course of heating consisting of such phases was given in final Eqs. Only difference lies in nature and quantity of different phases developed at 980 C and on their individual phase transformation or solid state reaction among them. It exhibited two small DTA exotherms, one at 985 C, other at 1250 C those are related to transformation of it to mullite in two steps i.e., it crystallized to mullite via spinel as an intermediate phase. Phase transformation sequence up to mullitization constitutes one aspect of research. The tentative phase evolution of SP precursor route of transformation to mullite type phase is as follows. Source of silica alumina components, techniques of precursor synthesis, kinds of gel/precursor produced, routes of mullite formation favored.
