Dynamic simulation of sintering neck growth with coupling multiple
physical field
TAN Shulin1,2,ZHANG Xiaomin1,2,ZHAO Zhipeng1,2,WU Zhouzhi1,2
1College of Aerospace Engineering,Chongqing University,Chongqing 400044,China;
2Chongqing Key Laboratory of Heterogeneous Material Mechanics,Chongqing 400044,China
Abstract A fully coupled thermo-mechano-diffusional phase field model was presented to investigate the relationship
between the driving force and the neck growth during solid sintering. It could be seen from the morphological
evolution that the neck radius will increases gradually and the neck curvature decreases with the interface migration
in the sintering process. Moreover,with the decreasing of total surface area of the system,and the pores become
circular and reduce gradually. The simulation results show that the strain gradient coupling term play a domain
role in the fully-coupled condition,and the effect of the temperature gradient coupling term is negligible. Finally,
dynamic equations can be obtained by contrastive analysis among the change of neck growth rates and driving
forces of neck growth. It indicateds that the neck growth rate is the product of the neck growth driving forces to
the power of k0 and the physical parameters CM which relates to the diffusion mobility. And the neck growth driving
forces is only related to the shape of neck,and has nothing to do with sintering speed and sintering process.