Binder System Composition on the Rheological and Magnetic Properties of Nd-Fe-B Feedstocks for Metal Injection Molding

Author:

Momeni Vahid1,Luca Sorana2ORCID,Gonzalez-Gutierrez Joamin13ORCID,Cano Santiago1,Sueur Emilie2,Shahroodi Zahra1ORCID,Schuschnigg Stephan1ORCID,Kukla Christian4ORCID,Holzer Clemens1ORCID

Affiliation:

1. Institute of Polymer Processing, Montanuniversitaet Leoben, 8700 Leoben, Austria

2. CEA-Liten, Université Grenoble Alpes, F-38000 Grenoble, France

3. Functional Polymers Research Unit, Luxembourg Institute of Science and Technology (LIST), L-4940 Hautcharage, Luxembourg

4. Industrial Liaison Department, Montanuniversitaet Leoben, 8700 Leoben, Austria

Abstract

The applications of Nd-Fe-B-based magnets are experiencing significant diversification to achieve efficiency and miniaturization in different technologies. Metal injection molding (MIM) provides new opportunities to manufacture Nd-Fe-B magnets with high geometrical complexity efficiently. In this study, the impacts of the binder system composition and powder loading on the rheological behavior, contamination, and magnetic properties of the Nd-Fe-B MIM parts were investigated. A high-pressure capillary rheometer was used to measure the apparent viscosity and pressure drops for feedstocks with different binder formulations and powder contents. Also, oxygen and carbon contamination, density, and magnetic properties were measured for different feedstock formulations and powder loadings. From the rheological, density, and magnetic properties points of view, the binder system consisting of 45 vol.% LLDPE as backbone was selected as the optimum formulation. The findings indicated that the sample with this binder system and 55 vol.% powder content had a high density (6.83 g/cm3), remanence (0.591 T), and coercivity (744.6 kA/m) compared to other binder compositions. By using 58 vol.% powder loading, the values of density (7.54 g/cm3), remanence (0.618 T), and carbon residue (982 ppm) improved, and a suitable rheological behavior was still observed. Thus, a suitable feedstock formulation was developed.

Funder

European Institute of Innovation and Technology

Publisher

MDPI AG

Reference73 articles.

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