Effect of gravity on dimensional change during sintering—II. Shape distortion

Abstract Phenomena of shape distortion caused by gravity under solid- and liquid-phase sintering are described numerically using the finite-element method based upon a continuum theory of sintering. Finite-element analysis is performed for the solid-phase sintering of a copper powder cylindrical specimen to replicate earlier experiments reported by Lenel et al ( Trans. Am. Inst. Min. Engrs , 1963, 227 , 640). The results of the finite-element calculations are also compared with experimental data on liquid-phase sintering of a W–Ni–Fe powder system using a quantitative criterion of shape distortion. It is demonstrated that shape distortion accumulated during solid-phase sintering should be taken into account when considering gravity-induced configuration—dimensional changes under liquid-phase sintering. The finite-element analysis of shape distortion under liquid-phase sintering reproduces an “elephant foot” shape—a final shape observed in sintering practice.