ABSTRACT
This chapter discusses the thermal analysis curves and phase transformation studies by X-raydiffractometry of various earlier activities have been thoroughly reviewed and it has been shown that the raw materials used and the choice of their synthesis generate three kinds of precursors: monophasic, monophasic of the other kind, and colloidal or diphasic. Ceramists and mineralogists have shown a lot of interest in using the thermal analysis method to study the phase transformation of mullite gels. The mixing scale in the mullite sol-gel precursors might control the phase transformation sequence, temperature of mullite formation, and properties of the sintered mullite. The relative ratio of mullite to spinel phase formed in the polymeric gel was found to be different from that in the nitrate-derived gel. The concise results above show that both thermal evolution and phase transition are strongly influenced by various chemical processing methods.
