Volume changes accompanying the sintering of materials of the copper-tin-ferrochromium system

Conclusions

In the sintering of Cu-Sn-FC composites their volume shrinkage depends on the compact porosity: It grows with increasing starting porosity. Cu-Sn-FC composite materials of the compositions investigated, unlike materials of the Cu-Sn system, exhibit no compact growth during sintering. In low-porosity composites the ferrochromium inclusions, which undergo no deformation, prevent the formation of isolated drops of tin, thereby eliminating factors giving rise to specimen growth during sintering. In high-porosity Cu-Sn-FC composite compacts the solid ferrochromium inclusions, which are not wetted by liquid tin, do not dissolve in it, and do not react with dopper, prevent a regrouping of particles during sintering, thereby arresting shrinkage. With increasing concentration of FC inclusions their influence on the shrinkage of the composite materials grows.