Sintering of polycrystalline materials occurs by

The PD153035 hydrochloride from kaolinite to mullite can be described by a sequence of three reactions as reported elsewhere [29] and [30]. The first reaction observed is connected to the dehydroxylation of kaolinite taking place from 450 to 650 °C [31]. At higher temperature, between 850 and 1000 °C, there is a second reaction usually associated to the cubic spinel phase formation [32]. From Fig.