Feedstock Processing with Small Additives of Polymer Binder by Solid-Phase Technology

In this paper we consider the possibility of obtaining compact blanks and products from a granular metal-polymer composite based on chromium-molybdenum steel with small additives of a polymer binder by solid-phase pressing. The mixture compaction and its compressibility are considered as non-stationary deformation processes that depends on the changing over time rheological behavior of the material. The kinetics of pressing a granular mixture into compact blanks in a special mold by loading at a constant deformation rate has been studied. Rheological curves of stress–strain dependences are obtained, the time of the onset of progressive stress increase is determined. Optimal parameters of the blanks compacting from the green mixture have been found. Thus, it makes possible to obtain products with minimal porosity, and the physical and mechanical parameters of compacts, such as porosity, compressive strength and microhardness, have been studied.