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Название Investigation of dependence of density of hard magnetic material intermediates based on alloy Pr15Fe77,8В7,2 on pressing force with wet compacting method
DOI 10.17580/tsm.2017.03.12
Автор Tarasov V. P., Kutepov A. V., Kutepov D. A., Khokhlova O. V.
Информация об авторе

National University of Science and Technology MISiS, Moscow, Russia:

V. P. Tarasov, Professor, Head of a Chair of Non-Ferrous Metals and Gold
A. V. Kutepov, Leading Engineer of a Center of Industrial Technologies Engineering
D. A. Kutepov, Engineer of a Center of Industrial Technologies Engineering
O. V. Khokhlova, Engineer of a Chair of Non-Ferrous Metals and Gold, e-mail: hohlova.oksana.v@gmail.com


Magnetic materials largely determine the development of energy-efficient technologies, environmentally friendly modes of transport, household appliances and medical equipment, and electronic instrument. More highenergy permanent magnets are the ones based on rare earth metals (REM). Currently, hard magnetic materials (HMM) based on alloy Pr15Fe77.8В7.2 are the most promising for production of permanent magnets for cryogenic systems and components of spacecraft operating at very low temperatures (down to minus 180 oC). All rare-earth magnetic materials are obtained by powder metallurgy techniques, one of which operation is compacting (pressing) of fine HMM powders in a texture magnetic field. Currently, the most common method of compacting is a dry compaction. Thus receiving and compacting the HMM powders must be carried out in protective inert atmosphere (nitrogen or argon), since these powders are readily oxidized in air, resulting in a drop in their magnetic characteristics. An alternative is wet compaction where HMM powders are obtained and their compacting is carried out in an inert liquids, providing the better protection of HMM powders from environmental effect. This paper studied the density dependence of the HMM intermediates based on alloy Pr15Fe77.8В7.2 by pressing force when wet compacting method in specific range of pressures from 15 to 200 MPa. Wet compaction in the range of unit pressures of 15 to 75 MPa with high accuracy is described by the equation ρ = 0.0594 ln (P/Pcr) + 1, and in the range of 75 to 200 MPa — by the equation lg P = 9.151 lgρ + 3.825. Changing the volume content of HMM powder in the slurry of isopropyl alcohol from 5 to 50%, regression of the calculated density does not exceed 1%, and the critical pressure of compression is in the range from 6287 to 6683 MPa.
This work was carried out within the agreement between the National University of Science and Technology MISiS and Scientific and Production Company “MAGNETON” (Moscow, Russia) No. 1/2015 on 28.07.2015, realized with the financial support; governmental order of the Russian Federation No. 218 on 09.04.2010.

Ключевые слова Rare-earth metals, magnetic materials, permanent magnets, wet compaction, equation pressing, density, praseodymium, powder metallurgy
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