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Belyaev I.V.,Vladimir State University | Moiseev A.V.,Vladimir State University | Kutepov A.V.,Magneton Research and Production Association | Lomtev L.A.,Magneton Research and Production Association | Kireev A.V.,Vladimir State University
Metal Science and Heat Treatment | Year: 2015

The causes of the action of hafnium additives on the magnetic properties of single-crystal permanent magnets from alloy YuNDKT5AA are studied. The temperature regimes of the isothermal magnetic treatment of single-crystal permanent magnets from alloy YuNDKT5AA with a hafnium additive is corrected. Anew mode of multistage tempering is suggested and an operation of thermal stabilization of permanent magnets is introduced. © 2015, Springer Science+Business Media New York.

Belyaev I.V.,Magneton Research and Production Association | Grigorovich K.V.,RAS Institute of Metallurgy | Kolchugina N.B.,RAS Institute of Metallurgy | Shibaev S.S.,RAS Institute of Metallurgy
Inorganic Materials | Year: 2010

The need for using pure starting components in the production of Alnico and Nd-Fe-B system alloys for permanent magnets of high quality is substantiated. The content of gas-forming impurities and nonmetallic inclusions was shown to affect substantially the formation of perfect structure of Alnico-type magnets; optimum conditions of preliminary treatment of the melt to decrease the content of gas-forming elements in ingots were determined. The negative effect of the contamination of starting materials with respect to gas-forming elements was determined and correlations between the oxygen content in Nd-Fe-B magnets and their properties were analyzed. © 2010 Pleiades Publishing, Ltd.

Belyaev I.V.,Vladimir State University | Kireev A.V.,Vladimir State University | Moiseev A.V.,Magneton Research and Production Association | Kutepov A.V.,Magneton Research and Production Association
Inorganic Materials | Year: 2014

We have studied impurity concentration in components of starting mixtures for smelting the HDeh CyrillicKT5AA hard-magnetic alloy. It has been shown that the concentrations of nitrogen and carbon - regulated impurities in this alloy - in some of the metals that are used as components of starting mixtures exceed the permissible level. We recommend to analyze such metals for nitrogen and carbon before use. Metals with increased carbon concentration should be remelted in vacuum or an argon atmosphere in the presence of solid oxidants. This approach allows expensive high-purity components of starting mixtures to be replaced by less pure metals, with no loss in the quality of the alloy, and ensures a marked reduction (by up to 15%) in the production cost of the alloy. © 2014 Pleiades Publishing, Ltd.

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