Abstract
The PURPOSE of the paper is determination of the influence regularities of mechanochemical activation parameters on the particle size and properties of hot-deformed powder materials (HDPM) that are based on activated chip powder D16 with the addition of ferrotitanium. METHODS. Combined mechanochemical activation of chip D16 and ferrotitanium was carried out in the saturated aqueous solution of boric acid (SASBA) in a planetary ball mill SAND-1 at different processing times and grinding rates. The particle size distribution of charge followed by its processing in a hand mixer was studied and the agglomeration parameter was determined. The resulting charge was divided into fractions; one part was mixed with aluminum powder; subjected to cold moulding followed by short-term heating and forming. Hardness, ultimate shear strength and ultimate bending strength of hot-deformed powder materials were also determined. RESULTS AND THEIR DISCUSSION. 3D spline models of the activated chip powder (ACP) yield dependence on grinding time and rate have been constructed. Introduction of 30% saturated aqueous solution of boric acid of the charge weight into the grinding media provides better grinding estimated by the amount of yield of the activated chip powder. Using Rosin-Rammler equation the correspondence to the normal distribution law has been revealed for the particles of this charge. The integral curves of particle size distribution after the mechanochemical activation and manual processing have been constructed. CONCLUSIONS. The optimal parameters of mechanochemical activation are determined. They provide a higher yield of the activated chip powder. The resulting charge is characterized by a minimum average particle sizes and the increased value of the agglomeration parameter. The obtained materials have increased values of the ultimate shear strength (249 MPa), hardness (102 HRE) under the bending strength of σ b = 179 MPa. An improved technology is proposed for the production of hot-deformed powder materials based on mechanochemically activated chip powder with the addition of ferrotitanium.
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