Abstract: This paper was devoted to the modeling of pore evolution in sintering ceramics by a two-dimensional phase-field model. A pore among four grains was considered,
and the microstructure was described by a continuous density field and a long-range orientation field(LRO). The evolution of the density was governed by Cahn-Hilliard
equation, while the orientation field by the time-dependent Ginzburg-Landau equation(TDGL). The nonlinear evolution equations were solved by a semi-implicit Fourier-spectral
scheme. The simulation results reflect the microscopic process such as grain contact, sintering neck growth and pore spheroidization. The predicted growth rate of sintering
neck and sintering rate for different ratios of grain boundary to surface mobility are consistent with the existing theoretical analysis.

Key words: sintering of ceramics, evolution of pore microstructure, phase-field model