Study of Sintering of Gradual Porous Structures Obtained by Gravitational Sedimentation

Abstract

In our studies, we used spherical nickel powder. When powders with similar shapes but different sizes are sintered under the same conditions, the sintering time required to get the same degree of sintering varies. Due to the small particles, the sintering time needed for the formation of the sintering necks is short. The top layer of sedimented samples is over-sintered while the bottom of the sample is in the initial stage of sintering. This phenomenon was studied by sintering of nickel powder with different particle size ranges. The analysis of the sintered layers has been done using scanning electron microscopy. The influence of the sintering regime on the formation of the sintering necks was investigated.