REC «Mekhanobr-Tekhnika» (St. Petersburg, Russia):

Cherkasova M. V., Senior Researcher, Candidate of Engineering Sciences, cherkasova_mv@mtspb.com
Samukov A. D., Head of Department, samykov_ad@mtspb.com
Kuksov M. P., Senior Researcher, Candidate of Engineering Sciences, kuksov_mp@ mtspb.com
Arsentyev V. A., Chief Researcher, Doctor of Engineering Sciences, ava@mtspb.com

The paper describes the influence of various intensifiers on the material grinding process. The most well-known method for intensifying chip grinding consists in the use of polymethyl methacrylate (PMMA), a high molecular weight polymer additive. It intensifies crushing of steel chips as compared to grinding in the air or in alcohol and reduces the oxygen content in the metal phase, improving the properties of the resulting powder. However, contamination of the powders with polymer degradation products significantly limits the applications of this method for intensifying chip grinding. Based on the data in various studies, gases may be rated as follows in terms of their effect on the disintegration of metal powders: hydrogen > helium > argon > nitrogen > air. When comparing the intensification of fine grinding of metal powders with the use of PMMA and a gaseous medium, it may be concluded that both methods have a common major drawback, which is the contamination of the finished powders with the products of interaction between the grinding intensifiers and the material being ground. In order to improve the disintegration efficiency of metal powders and minimize the negative effect, a wide range of experimental studies will be required, with the grinding of metal waste not only in gaseous, but also in liquid media, as well as with the use of surfactants. A comprehensive study of the effects of various media and surfactants on the grinding kinetics, both when used individually and in combinations, may help identify the best intensifiers that would eliminate the unnecessary contamination of the grinding products.
The study was carried out under the grant issued by the Russian Science Foundation (project No. 20-79-10125).

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