Abstract
The kinetic mechanism of sintering shrinkage at 900–1240 °C was investigated to optimize the sintering process of triaxial porcelain. The respective reactions partially overlapped in differential thermodilatometric curves, namely Al-Si-spinel formation, mullite nucleation and mullite growth, were separated by mathematical deconvolution analysis. Then the kinetic mechanisms (m) were calculated using nonlinear regression analysis on experimental master plots of the generalized reaction rate (dα/dθ) versus the reacted fraction (α). The sintering shrinkage exhibits strong anisotropy which origins from approximately parallel arrangement of clay plates and is dominated by the mullite growth during densification, leading to anisotropic preexponential factors (A) and activation energies (E). The values of m systematically change with heating rates, in which the mullite growth is induced by the development of the chemical compositions and microstructure of secondary mullite nanotubes. Nevertheless, preexponential factors are independent on the heating rates.
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