Microstructure, texture, and magnetic properties of backward extruded NdFeB ring magnets

Grünberger, W.; Hinz, Dietrich; Schläfer, D.; Schultz, L.

doi:10.1016/0304-8853(95)01118-8

Cited by 22 publications

(7 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The backward extrusion was performed in an inert gas at 800C. The ring magnets have an outer diameter of 30 mm, an inner diameter of 24 mm, and a height of about 30 mm (Griinberger, 1995).…”

Section: Methodsmentioning

confidence: 99%

Analysis of Texture Distribution in NdFeB Hard Magnets by Means of X‐Ray Diffraction in BRAGG‐BRENTANO Geometry

Schläfer¹,

Walker²,

Mattern³

et al. 1996

Texture, Stress, and Microstructure

Self Cite

View full text Add to dashboard Cite

Three different methods are used for the quantitative local texture analysis of fibre textures. Two methods are based upon the evaluation of BRAC-BRENTANO diffraction diagrams. In the first method relative intensity parameters are calculated, whereas in the second Rietveld preferred orientation factors are determined. The third method uses measured pole figures and the series expansion (Bunge).The method is applied to hot backward extruded NdFeB ring magnets. A local texture determination dependent on a sample surface distance is possible. The results are compared with magnetic measurements.

show abstract

Section: Methodsmentioning

confidence: 99%

Analysis of Texture Distribution in NdFeB Hard Magnets by Means of X‐Ray Diffraction in BRAGG‐BRENTANO Geometry

Schläfer¹,

Walker²,

Mattern³

et al. 1996

Texture, Stress, and Microstructure

Self Cite

View full text Add to dashboard Cite

show abstract

“…In the axial direction, remanence ( ) increased monotonically from the top to bottom part of the ring-shaped HD magnet while coercivity ( ) decreased simultaneously [11], [12]. In the radial direction, a ring-shaped HD magnet displayed an approximate linear enhancement of from the outer to inner surface [6], [13]. For the cylindrical HD magnet, Guruswamy et al presented a theoretical investigation on the inhomogeneity of deformation via simulation method using a finite-element-based software called "ANTARES" [14].…”

Section: Introductionmentioning

confidence: 94%

Origins of Radial and Axial Inhomogeneity of Magnetic Performance in Cylindrical Nd-Fe-B Magnet Prepared by Hot Deformation

et al. 2014

View full text Add to dashboard Cite

Cylindrical Nd-Fe-B magnets with different height reductions were prepared by hot deformation method. The inhomogeneity of the magnetic performance along the radial direction was revealed with a closed circuit B-H apparatus while that along the axial direction was shown with a vibrating sample magnetometer. The microstructure examined with scanning electron microscopy suggests that orientation variation and grain coarsening of Nd Fe B platelets cooperate to result in the deterioration of remanence along radial direction from center to edge. X-ray diffractometry was carried out over the end surfaces and axially across the middle cross-section of the cylindrical magnet, showing the important role of texture in determination of remanence along the axial direction. Further investigations on an intermediate hot-deformed magnets reveal the unevenness of deformation degree in the axial direction during hot deformation, which accounts for the axial variation of texture and consequent remanence.

show abstract

“…Radially oriented RM exhibits inhomogeneity of the remanence along the axial direction. [72,77] This inhomogeneity has been ascribed to the texture difference in the axial direction. [78,79] To address this problem, Tang et al [80] developed a pre-deformation technique.…”

Section: Magnetic Performance Improvement Of Backwardextruded Ndfeb Rmmentioning

confidence: 99%

Rare earth permanent magnets prepared by hot deformation process

et al. 2018

View full text Add to dashboard Cite

Hot deformation is one of the primary methods for fabricating anisotropic rare earth permanent magnets. Firstly, rapidly quenched powder flakes with a nanocrystal structure are condensed into fully dense isotropic precursors using the hot-pressing process. The prepared isotropic precursors are then hot-deformed to produce high-anisotropy uniaxial bulk rare earth permanent magnets and a highly textured structure is produced via this process. The resulting magnets possess many advantages such as near-net-shape, outstanding corrosion resistance, and ultrafine-grain structure. The influence of the preparation parameters utilized in the hot-pressing and deformation processes on the magnetic properties and microstructure of the permanent magnets are systemically summarized in this report. As a near-net-shape technique, the hot deformation process has notable advantages with regard to the production of irregular shapes, especially for radially oriented ringshaped magnets with high length-diameter ratios or thin walls. The difficulties associated with the fabrication of crack-free, homogeneous, and non-decentered ring-shaped magnets are substantially resolved through an emphasis on mold design, adjustment of deformation parameters, and application of theoretical simulation. Considering the characteristics of hotdeformed magnets which include grain shape and size, anisotropic distribution of intergranular phases, etc., investigation and improvement of the mechanical and electric properties, in addition to thermal stability, with the objective of improving the application of hot-deformed magnets or ring-shaped magnets, is of practical significance.

show abstract

Microstructure, texture, and magnetic properties of backward extruded NdFeB ring magnets

Cited by 22 publications

References 2 publications

Analysis of Texture Distribution in NdFeB Hard Magnets by Means of X‐Ray Diffraction in BRAGG‐BRENTANO Geometry

Analysis of Texture Distribution in NdFeB Hard Magnets by Means of X‐Ray Diffraction in BRAGG‐BRENTANO Geometry

Origins of Radial and Axial Inhomogeneity of Magnetic Performance in Cylindrical Nd-Fe-B Magnet Prepared by Hot Deformation

Rare earth permanent magnets prepared by hot deformation process

Contact Info

Product

Resources

About