Development of hydrogen technologies of crushing microstructure of ferromagnetic alloys based on R₂Fe₁₄B to improve the properties of permanent magnets

The microstructure of Nd2Fe14B alloy after HDDR treatment: average grain size is 50-100 nm.

Area of applications

Industrial companies, which relate with the production of high energy permanent magnets based on rare-earth metals.

Brief description

New technologies of textured nanocrystalline state formation in rare-earth metal – iron – boron system alloys by means of hydrogen metallurgy processes with the aim of producing permanent magnets with higher magnetic properties.

Expected results

The project is targeted on the development of new approaches to obtaining ferromagnetic powders based on R₂Fe₁₄B compound with anisotropic nanocrystalline structure and producing bonded and sintered permanent magnets from these powders. The results of project expand the knowledge about the features of phase transformations initiated by hydrogen in rare-earth metal – iron – boron system alloys. New data will be the scientific base for development of methods of nanocrystalline anisotropic structure formation in these type ferromagnetic alloys.

Advantages

Fulfillment of the project leads to improvement existing technologies of producing anisotropic rare-earth permanent magnets with higher level of magnetic properties.

Competitors

Magnet Energy Corp., San Jose, CA 95125, USA.

Project development

The formation of nanostructure in ferromagnetic alloys will realize by means of hydrogenation, disproportionation, desorption, recombination (HDDR), mechano-chemical treatment and theirs combination. Grain size will controlled by conditions of phase transformation (temperature, hydrogen pressure, heating rate, interaction duration) and the change of diffusion rate through substitution of neodymium and iron by other elements.

Intellectual property

Positive decision to grant of patent on the application No 201211472 The method of anisotropic fine-grained microstructure formation in powders of Nd-Fe-B system alloys / I. I. Bulyk, A. M. Trostianchyn, P. Ya. Lyutyy, V. V. Burhoveckyy; owner: Karpenko Physico-Mechanical Institute of National Academy of Sciences of Ukraine; submitted 04.10.2012.
Patent No 96810 Ukraine, H 01 F 1/053; H 01 F 1/055; B 82 B 3/00 The method of anisotropic fine structure formation in powders of Sm-Co system alloys by means of hydrogen-vacuum heat treatment / I. I. Bulyk, V. V. Panasyuk, A. M. Trostianchyn; owner: Karpenko Physico-Mechanical Institute of National Academy of Sciences of Ukraine; submitted 11.01.2010; published 12.12.2011, Bulletin No 23.
Patent No 96811 Ukraine, H 01 F 1/053; H 01 F 1/055; B 82 B 3/00 The method of anisotropic fine structure formation in powders of Sm-Co system alloys by means of milling under hydrogen / I. I. Bulyk, V. V. Panasyuk, A. M. Trostianchyn; owner: Karpenko Physico-Mechanical Institute of National Academy of Sciences of Ukraine; submitted 11.01.2010; published 12.12.2011, Bulletin No 23.
Patent No 102899 Ukraine, H 01 F 7/00; H 01 F 7/02, B 22 F 9/00, B 22 F 9/04 The method of hydrogenation, disproportionation, desorption, recombination (HDDR) under low hydrogen pressure for formation of anisotropic fine structure in powders of Sm-Co system alloys and producing powders with this structure / I. I. Bulyk, A. M. Trostianchyn, V. M. Dmytryshyn, P. Ya. Lyutyy; owner: Karpenko Physico-Mechanical Institute of National Academy of Sciences of Ukraine; submitted 14.11.2011; published 27.08.2013, Bulletin No 16.

Contact information

Executor: Karpenko Physico-Mechanical Institute of National Academy of Sciences of Ukraine

Project №36 “Development of hydrogen technologies of crushing microstructure of ferromagnetic alloys based on R₂Fe₁₄B to improve the properties of permanent magnets”

Contact person:

Bulyk Igor І

Tel. +38(032)-229-66-46

Е-mail: bulyk@ipm.lviv.ua