Process Approaches for Producing Complex Composite Modifiers by Rolling Powder Mixtures.
I. Powder Modidying Mixtures.
Composition, Structure, and Properties.

Abstract

This series of articles are devoted to the development of process approachesfor producing complex composite modifiersto manufacture agricultural products from superhard cast irons with sphere-like graphite. Strip and fragment complex composite modifiers can be obtained by rolling of powder mixtures. The first article justifies the choice of modifiersand characterizes the starting powders they consist of. Weight and volume correlations between brittle and plastic components for different composition of modifying mixtures are calculated. It is established, that all powder compositionsbelong to the critical systems that have approximately 50% of both brittle and plastic components. Such systems require special process approaches to produce top-quality products. Processing characteristics of the powders impacting the quality of the rolling stripsare determined. These are:bulk density of the starting powders and their mixtures, friction index (Hausner Ratio), and angle of shear and its tangent.