Features of Structural Formation in a Cu–Al Powder System

Abstract

Investigations of the process of liquid-phase sintering of powder compositions of the Cu–Al system were carried out. As a result, the dependence of their final porosity indicators on the corresponding initial factors, comprising sintering temperatures and the number of constituent components, was revealed. Based on the obtained experimental data, the dependences of the microstructure of Cu–Al system compositions having a 25% aluminum content on sintering temperature and aluminum concentration are presented. In the course of the research, the dependence of the aluminum solid phase distribution in the Cu–Al system on the sintering temperature was studied at various concentrations. Experimental data on determining the porosity of the Cu–Al system compacts, the amount of the solid phase component in the liquid, as well as the amount of aluminum in the solid phase after sintering, depending on its initial concentration, are presented. The sintering of Cu–Al system compacts is shown to proceed with the participation of the liquid phase. In this case, changes in the dimensions of the sintered briquettes, on which the stability of the resulting powder blanks depends, turns out to be important. The technique and results of dilatometric studies of changes in compact dimensions depending on the sintering temperature and the initial porosity of the workpieces are presented. Additionally, the dependence of the relative change in the sample length and the medium temperature on the aluminum composition concentration was investigated.