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Registration Number

0215U000332, 0114U000831 , R & D reports

Title

Development of hydrogen technologies of microstructure refining of R2Fe14B-based alloys for improvement of permanent magnets properties

Head

Bulyk Ihor Ivanovych, Доктор технічних наук

Registration Date

18-02-2015

Organization

Karpenko Physico-Mechanical Institute of the National Academy of Science of Ukraine

Description

The object of the project is low temperature sintering of powders of ferromagnetic Nd2Fe14B based alloys by means of hydrogen induced phase transformations. The aim is testing of the idea of the hydrogen using as a technological environment for the development of at low temperature sintering method of fine microstructures Nd2Fe14B based alloys powders. The Nd16Fe73.9Zr2.1B8 and Nd11.8Fe81.1Zr1.2B5.9 alloys were studied. Conditions, composition and crystallographic parameters of the phases, microstructure of powders and sintered pellets, at low temperatures were investigated by means of differential thermal, X-ray phase, electron microscopy, and elemental analyzes. It was experimentally confirmed the possibility of hydrogen-vacuum treatment for low-temperature sintering of anisotropic Nd2Fe14B based alloys powders with fine microstructure. The process consists of two stages: sintering in hydrogen and in a vacuum. In the first stage alloy disproportionates partially and recombine at the second stage. It was found that after sintering alloy has microstructure with grain size of 100-320 nm.

Product Description

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Борух Ігор Володимирович
Бурховецький Валерій Вікторович
Тростянчин Андрій Миколайович