Feasibility Study for Feedstock Recycling on PIM Nd-Fe-B Permanent Magnets

Leonardo Ulian Lopes; Pablo Vinicius de Souza Lia Fook; Andres Owczarzak; Nil Uenal; Thomas Hartwig; Paulo Antônio Pereira Wendhausen

doi:10.4028/www.scientific.net/MSF.802.574

Paper Titles

Frequency Characterization of Ferrite Beads in the Microwave Range for Nonlinear Applications
p.552

Relation between Initial Magnetization Curve and Grain Size of Nanocrystalline NdFeB Magnets
p.558

Coercivity Mechanism in Hard and Soft Sintered Magnetic Materials
p.563

Magnetic Domains Observation from Bitter Patterns of NdFeB Alloy
p.569

Feasibility Study for Feedstock Recycling on PIM Nd-Fe-B Permanent Magnets
p.574

A Simple Device for Measuring Losses in Soft Magnetic Materials
p.579

NdFeB Type Magnets Produced by Spark Plasma Sintering
p.585

Thermal Analysis Investigation of NdFeB Bonded Magnets
p.590

Upper Limit for the Coercive Force in NdFeB and PrFeB Magnets
p.596

HomeMaterials Science ForumMaterials Science Forum Vol. 802Feasibility Study for Feedstock Recycling on PIM...

Feasibility Study for Feedstock Recycling on PIM Nd-Fe-B Permanent Magnets

Abstract:

Powder injection molding (PIM) is a well-known process for the production of geometrically complex shaped parts at a high production rate. The possibility of recycling the raw material (feedstock) is economically necessary for industrial applications, especially when processing very expensive materials, such as rare-earth alloys. In this study, Nd-Fe-B magnets were fabricated by powder injection molding, in which the injection residues (gates, sprue and surplus green samples) were reprocessed, up to 6 times. Subsequently, samples underwent binder extraction by chemical and thermal procedures, being finally sintered under high vacuum. Physical characterizations were carried out and the magnetic properties were measured via B-H trace analysis in each batch to study the influence of the recycled feedstock on the magnetic properties of produced samples. It was concluded that the properties are significantly affected after the second reprocessing lot, mainly due to the contamination of the feedstock by organic elements by-products of the binder decomposition.

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Periodical:

Materials Science Forum (Volume 802)

Pages:

574-578

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.802.574

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Online since:

December 2014

Authors:

Leonardo Ulian Lopes*, Pablo Vinicius de Souza Lia Fook, Andres Owczarzak, Nil Uenal, Thomas Hartwig, Paulo Antônio Pereira Wendhausen

Keywords:

Feedstock Recycling, Magnetic Materials, Metal Injection Molding, NdFeB

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