# Fileset

[REPM2025_P2-49_Chernyshev.pdf](https://mdr.nims.go.jp/filesets/f475b4cd-40b9-451a-9d0e-9926539d6651/download)

## Creator

Bogdan Dmitrievich Chernyshev, Igor Viktorovich Shchetinin

## Rights

[Creative Commons BY Attribution 4.0 International](https://creativecommons.org/licenses/by/4.0/)

## Other metadata

[Fabrication of Sm-Co-Fe-Cu-Zr and SrFe12O19 based permanent magnets by PIM-technology and stereolithography methods](https://mdr.nims.go.jp/datasets/060cd59a-9cb5-47b5-bccd-54b3fafcfc52)

## Fulltext

Презентация PowerPointChernyshev B.D., Shchetinin I.V.FABRICATION OF Sm-Co-Fe-Cu-Zr AND SrFe12O19 BASED PERMANENT MAGNETS BY PIM-TECHNOLOGY AND STEREOLITHOGRAPHY METHODSAdditive manufacturing and powder injection molding (PIM) technologies promise much for the production of permanentmagnets. PIM-technology has been successfully used for fabrication of Fe-Cr-Co permanent magnets with clear structureand high magnetic properties in comparison with investment casting technology. And SLM technology applied for buildingof one layer from Nd-Fe-B powder. This work dedicated to study possibility of making ceramic magnets based on cheapstrontium hexaferrite SrFe12O19 and anisotropic Sm-Co-Fe-Cu-Zr magnets by PIM-technology and application of fine ferritepowders for fabrication of photopolymers and their usage for making complex shape samples by SLA methodAbstract:Chernyshev Bogdan — Researcher of Laboratory1Shchetinin Igor — Head of Laboratory2Laboratory Names:Laboratory 1 — Laboratory of Metallurgical ProcessesLaboratory 2 — Laboratory of Multifunctional Magnetic NanomaterialsAuthors :Scheme of permanent magnet production by PIM-technologyBDmChernyshev@rosatom.ruContacts:Scheme of permanent magnet production by SLA-technology1. Feedstock preparation Sm-Co powders with chemicalcomposition (wt. %) 25.1 Sm, 48.8 Co,18.1 Fe, 5.4 Cu, 2.6 Zr and strontiumhexaferrite with average particle sizewas 22 µm were mixed with organicbinder to prepare granulate for PIMmethod2. Green body fabricationGranulate was compacted in aninjection molding machine at thetemperature close to meltingtemperature of organic binder to obtain«green body». Feedstock filled withSrFe12O19 powder were pressed withoutapplication magnetic field while Sm-Copowders were aligned inside «greenbodies» by external magnetic field of 2 T3. Brown body fabricationThey were obtained by solvent debinding: «green bodies» were keptin acetone, heptane and perchloroethylene at differenttemperatures. The largest amount of binder (6.5 wt. %) was removedusing acetone at 40 °CPowderBinderFeedstockTomography of SrFe12O19 «green bodies» with and without defects4. SinteringSintering of «brown bodies» filled withSm-Co-Fe-Cu-Zr and ferrite powderswas performed in vacuum furnace inargon and in muffle furnace in anoxidizing atmosphere respectively.Density of Sm-Co and ferrite magnetswas 8.2 and 4.8 g/cm3 respectivelyAnisotropic and isotropic Sm-Co magnets obtained by PIM-technology3D printing by stereolithography waspossible with a maximum filling ofphotopolymers by 19 wt. % of strontiumhexaferrite powder with average particlesize of 5 µm . Increase of the ferrite powderamount made polarization impossible evenwith powerful UV source. Research will becontinued with usage of finer powderswith particle sizes < 1 µm obtained bythe sol-gel method Autodesk EmberMagnetic properties of isotropic strontium hexaferrite permanentmagnets obtained by PIM-technology were about 70 % oftheoretical values: HCB = 71.1 kA/m, Br = 0.09 T. It occurredbecause of the low density of the samples and the presence ofdefects (cracks and pores). Combination of high density of Sm-Co-Fe-Cu-Zr permanent magnet and heat treatment allowed toachieve magnetic properties close to requirements of technicaldocumentation on anisotropic magnets: HCB = 743.8 kA/m,Br = 0.97 T, (BH)max = 219.5 kJ/m3Magnetic propertiesSrFe12O19 «green bodies» with different geometry obtained by SLA