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Frenkel’s theory of liquid-phase sintering was interpreted regarding pores as   the activated component. The data of isothermal sintering shrinkage vs. time   of the cordierite glass by Giess et al. are trained using the model by   Nikolić et al. to obtain the relative density at varied temperatures and   time. Then, the time constants are obtained as 1998.86mins, 388.21mins,   89.79mins and 26.11mins at 800°C, 820°C, 840°C and 860°C, respectively. The   calculated time constants are close to that by the theoretical calculation,   deviation of which arises from the fact that particle size is variable during   the sintering process. The time constant determination is crucial to the   research of the whole sintering process

Interpretation of Frenkel’s theory of sintering considering evolution of activated pores: I. Confirmation of the time constant