chemicallytechFine Chemical TechnologiesТонкие химические технологии2410-65932686-7575MIREA – Russian Technological University (RTU MIREA).10.32362/2410-6593-2025-20-3-264-275QSOBYJchemicallytech-2263Research ArticleCHEMISTRY AND TECHNOLOGY OF INORGANIC MATERIALSХИМИЯ И ТЕХНОЛОГИЯ НЕОРГАНИЧЕСКИХ МАТЕРИАЛОВFormation of the microstructure and properties of strontium hexaferrite magnets using powder injection moldingФормирование структуры и свойств магнитов на основе гексаферрита стронция, полученных с помощью технологии Powder Injection Moldinghttps://orcid.org/0000-0003-4129-3420ЧернышевБ. Д.ChernyshevB. D.

Богдан Дмитриевич Чернышев, аспирант, научный сотрудник

кафедра физического материаловедения; лаборатория металлургических процессов

111524; ; ул. Электродная, д. 2, стр. 1; 119049; Ленинский пр-т, д. 4, стр. 1; Москва

Scopus Author ID 57219974902

Bogdan D. Chernyshev, Postgraduate Student, Research Scientist

Department of Physical Materials Science; Laboratory of Metallurgical Processes, Giredmet

111524; 2-1, Electrodnaya ul.; 119049; 4-1, Leninskii pr.; Moscow

Scopus Author ID 57219974902

BDmChernyshev@rosatom.ruhttps://orcid.org/0000-0002-0281-2497ЩетининИ. В.SchetininI. V.

Игорь Викторович Щетинин, к. т. н., доцент

кафедра физического материаловедения

119049; Ленинский пр-т, д. 4, стр. 1; Москва

Scopus Author ID 36053563600, ResearcherID A-2270-2012

Igor V. Schetinin

119049; 4-1, Leninskii pr.; Moscow

Scopus Author ID 36053563600, ResearcherID A-2270-2012

ingvvar@gmail.comГосударственный научно-исследовательский и проектный институт редкометаллической промышленности «Гиредмет» имени Н.П. Сажина; Национальный исследовательский технологический университет «МИСИС» (НИТУ МИСИС)РоссияState Research and Design Institute of Rare Metal Industry “Giredmet”; National University of Science and Technology MISISRussian FederationНациональный исследовательский технологический университет «МИСИС» (НИТУ МИСИС)РоссияNational University of Science and Technology MISISRussian Federation202516072025203264275Copyright © Chernyshev B.D., Schetinin I.V., 20252025Чернышев Б.Д., Щетинин И.В.Chernyshev B.D., Schetinin I.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.finechem-mirea.ru/jour/article/view/2263   Objectives

   Objectives. The study set out to investigate the possibility of production strontium hexaferrite permanent magnets using powder injection molding (PIM) technology, which involves casting granules highly filled with ceramic powder. After obtaining the initial granulate based on organic binders and strontium hexaferrite powder, the material was cast in an injection molding machine to create the first intermediate (green) parts, followed by removal of the primary binder to obtain brown parts and final sintering.

   Methods

   Methods. Strontium hexaferrite powder was obtained by the ceramic method. The material underwent grinding in a planetary ball mill to obtain a powder having an average particle size of 13.4 μm, which is considered optimal for the applied PIM technology. Granulate materials, consisting of the obtained strontium hexaferrite powder combined with primary paraffin and secondary polyamide binders, were prepared by manual mixing of the components and used for creation of green parts in injection molding machine. Brown parts obtained following removal of binder from the obtained green parts were characterized by their higher brittleness and open pore structure. Permanent magnets with dimensions of 10 × 10 × 5 mm were obtained following sintering of brown parts in an oxidizing atmosphere.

   Results

   Results. The more than 70% higher strength of the magnetic properties of the obtained strontium hexaferrite samples compared to isotropic barium hexaferrite-based magnets manufactured in accordance with GOST 24063-80 is due to the presence of pores after sintering.

   Conclusions

   Conclusions. The possibility of using the ceramic method for producing strontium hexaferrite powder for use in granulate manufacturing was demonstrated. This raw material can then be used to obtain strontium hexaferrite permanent magnets via PIM technology having 80 % density.

   Цели

   Цели. Изучить возможность получения постоянных магнитов на основе гексаферрита стронция с помощью технологии Powder Injection Molding (PIM), заключающейся в литье гранулятов, высоконаполненных керамическим порошком. Данный процесс состоит из операций получения гранулята (исходного сырья на основе органического связующего и порошка гексаферрита стронция), литья гранулята в термопластавтомате для создания первых промежуточных («зеленых») деталей, последующего удаления связки из них, получения «коричневых» деталей и финального спекания.

   Методы

   Методы. Порошок гексаферрита стронция получен керамическим методом. Материал прошел стадию помола в планетарной шаровой мельнице до получения порошка со средним размером частиц 13.4 мкм, который считается оптимальным размером для PIM-технологии. На основе полученного порошка гексаферрита стронция, первичного связующего — парафина – и вторичного — полиамида – методом ручного смешивания компонентов подготовлен гранулят для создания «зеленых» деталей. Полученные детали подвергли операции удаления связующего — дебиндингу, в результате которого изготовили «коричневые» заготовки, отличающиеся более высокой хрупкостью и наличием структуры открытых пор. Постоянные магниты с размерами 10 × 10 × 5 мм получены методом спекания «коричневых» деталей в окислительной атмосфере.

   Результаты

   Результаты. Уровень магнитных параметров образцов на основе гексаферрита стронция составил более 70 % от значений, характерных для промышленных изотропных магнитов на основе гексаферрита бария в соответствии ГОСТ 24063-80, что обусловлено наличием пор в спеченных изделиях.

   Выводы

   Выводы. Установлена возможность применения керамического метода для производства порошка гексаферрита стронция, который может быть использован при изготовлении гранулята. Использование данного сырья позволяет изготавливать магниты методом PIM-технологии с плотностью не менее 80 %.

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The authors declare that there are no conflicts of interest present.