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Process Technology of Rare Earth Alloys

Process Technology of Rare Earth Alloys
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Process Technology of Rare Earth Alloys - 1

Fine Grinding and Classifying Process Technology for Rare Earth Alloys CHEMICAL INDUSTRY a Business Field of NETZSCH Grinding & Dispersing

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Process Technology of Rare Earth Alloys - 2

Solutions for Processing Rare Earth Alloys Fine Grinding and Classifying with a narrow p Magnetic materials are used in numerous applications as functional materials, e.g. in the ﬁeld of communication technology, in regulation and control processes, in drives, in measuring technology etc. Neodymium-iron-boron-magnets (Nd-Fe-B) are so-called rare earth magnets, which are characterized by their high energy density. This makes them particularly interesting for application areas in which strong magnetic ﬁelds but small volumes and low weights are required. For instance, in sensor technology the...

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Process Technology of Rare Earth Alloys - 3

particle size distribution In the manufacturing process the material powder is ground before being pressed and sintered. Its grinding is an essential step as the particle size is of signiﬁcant importance for the quality and properties of the magnets which are subsequently manufactured from the powder. Ideally the particle size distribution should be narrow and contain an extremely low ultra-ﬁne fraction (< 2 µm) and only a small amount of coarse particles (> 8 µm). Using jet mills and classiﬁers made by NETZSCH you can reliably process sensitive Nd-Fe-B-compounds or other alloys under inert...

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Process Technology of Rare Earth Alloys - 4

Dry Fine Grinding CGS Fluidized Bed Jet Mill Innovative gas jet mill suitable for grinding even the hardest products down to a size of d97 2 µm to 120 µm (depending on density) with a steep particle size distribution. The product is accelerated in a free gas jet and size reduction is carried out by the impact of particle against particle. Grinding is entirely autogeneous and no contamination of your product occurs. The integrated dynamic air classiﬁer can be inﬁnitely adjusted to your desired ﬁneness, which guarantees reproducible product quality. A ﬂap at the bottom of the grinding chamber...

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Process Technology of Rare Earth Alloys - 5

Classifying – Dedusting of ﬁne Powder CFS/HD-S High-efficiency Fine Classifier The CFS/HD-S High-efficiency Gas Classiﬁer, equipped with the patented CONVOR® classiﬁer wheel, is suitable for an extremely ﬁne classiﬁcation (d97 1 µm to 120 µm) with a closely deﬁned sharpness of cut providing you with a high and consistent product quality. Removing of ﬁne dust (< 1 µm) to further optimize product properties. Effective separation results can easily be achieved with just one classiﬁer wheel. The specially designed housing means a signiﬁcant improvement in throughput. Accessibility and cleaning...

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Process Technology of Rare Earth Alloys - 6

Results The ideal particle size before pressing and sintering of rare earth magnets ranges between 2 µm and 8 µm. Particles of these sizes can be well orientated by conventional magnetic ﬁelds and contribute to obtaining a high residual magnetism of the magnets which are made from them. The measurements of the particle size distribution of the Nd-Fe-B powder made on NETZSCH mills and classiﬁers, and the magnetic properties of the sintered magnets subsequently manufactured from it, deliver convincing results. After classifying, the ﬁnes fraction < 1.65 µm was around 0.75 %. At 2.4, the...

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Process Technology of Rare Earth Alloys - 7

Particle size distribution of Nd-Fe-B powder after grinding and classifying in comparison to conventionally produced product. 20 Volume Density (%) Conventionally produced product Product after grinding on the CONJET® and classifying on the CFS/HD-S Demagnetization curve of a Nd-Fe-B magnet manufactured from a classiﬁed ﬁne powder NETZSCH offers you comprehensive service Grinding- and classifying tests under inert conditions with your original material are possible in our test lab. With a cooperation partner magnet samples can be prepared from the material samples obtained in grinding...

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Process Technology of Rare Earth Alloys - 8

NETZSCH-Feinmahltechnik GmbH Selb, Germany NETZSCH Lohnmahltechnik GmbH Bobingen, Germany NETZSCH Premier Technologies, LLC. Exton PA, USA NETZSCH Industria e Comercio de Equipamentos de Moagem Ltda. Pomerode, Brazil NETZSCH Technologies India Private Ltd. Chennai, India NETZSCH Trockenmahltechnik GmbH Hanau, Germany NETZSCH Espana, S.A.U. Terrassa/Barcelona, Spain NETZSCH Mastermix Ltd. Lichfield, Great Britain NETZSCH (Shanghai) Machinery and Instruments Co., Ltd. Shanghai, China NETZSCH FRERES S.A.R.L. Arpajon, France NETZSCH Vakumix GmbH Weyhe-Dreye, Germany AO NETZSCH Tula Tula,...

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