Effects of (B2O3, P2O5) Additives on Microstructural Development and Phase‐Transformation Kinetics of Stoichiometric Cordierite Glasses

The microstructural development and phase‐transformation kinetics of stoichiometric cordierite glasses containing B 2 O 3 and/or P 2 O 5 additives were highly affected by the microstructural characteristics of the μ‐cordierite and the type of additives. The addition of B 2 O 3 tended to cause the formation of μ‐spherulitic dendrites with thin dendritic arms, which promoted the formation of α‐cordierite, either from crystallization of the residual glass or from transformation of μ‐cordierite. P 2 O 5 had the opposite effect: Increasing the temperature increased the growth rate of α‐cordierite more than that of μ‐cordierite.