Processing and Protection of Rare Earth Permanent Magnet Particulate for Bonded Magnet Applications PDF Download
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Author: Peter Kelly Sokolowski
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Peter Kelly Sokolowski
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 115
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Book Description
Rapid solidification of novel mixed rare earth-iron-boron, MRE2Fe14B (MRE = Nd, Y, Dy; currently), magnet alloys via high pressure gas atomization (HPGA) have produced similar properties and structures as closely related alloys produced by melt spinning (MS) at low wheel speeds. Recent additions of titanium carbide and zirconium to the permanent magnet (PM) alloy design in HPGA powder (using He atomization gas) have made it possible to achieve highly refined microstructures with magnetic properties approaching melt spun particulate at cooling rates of 105-106K/s. By producing HPGA powders with the desirable qualities of melt spun ribbon, the need for crushing ribbon was eliminated in bonded magnet fabrication. The spherical geometry of HPGA powders is more ideal for processing of bonded permanent magnets since higher loading fractions can be obtained during compression and injection molding. This increased volume loading of spherical PM powder can be predicted to yield a higher maximum energy product (BH)max for bonded magnets in high performance applications. Passivation of RE-containing powder is warranted for the large-scale manufacturing of bonded magnets in applications with increased temperature and exposure to humidity. Irreversible magnetic losses due to oxidation and corrosion of particulates is a known drawback of RE-Fe-B based alloys during further processing, e.g. injection molding, as well as during use as a bonded magnet. To counteract these effects, a modified gas atomization chamber allowed for a novel approach to in situ passivation of solidified particle surfaces through injection of a reactive gas, nitrogen trifluoride (NF3). The ability to control surface chemistry during atomization processing of fine spherical RE-Fe-B powders produced advantages over current processing methodologies. In particular, the capability to coat particles while 'in flight' may eliminate the need for post atomization treatment, otherwise a necessary step for oxidation and corrosion resistance. Stability of these thin films was attributed to the reduction of each RE's respective oxide during processing; recognizing that fluoride compounds exhibit a slightly higher (negative) free energy driving force for formation. Formation of RE-type fluorides on the surface was evidenced through x-ray photoelectron spectroscopy (XPS). Concurrent research with auger electron spectroscopy has been attempted to accurately quantify the depth of fluoride formation in order to grasp the extent of fluorination reactions with spherical and flake particulate. Gas fusion analysis on coated powders (dia.
Author: John J. Croat
Publisher: Woodhead Publishing
ISBN: 032388640X
Category : Technology & Engineering
Languages : en
Pages : 455
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Book Description
Modern Permanent Magnets provides an update on the status and recent technical developments that have occurred in the various families of permanent magnets produced today. The book gives an overview of the key advances of permanent magnet materials that have occurred in the last twenty years. Sections cover the history of permanent magnets, their fundamental properties, an overview of the important families of permanent magnets, coatings used to protect permanent magnets and the various tests used to confirm specifications are discussed. Finally, the major applications for each family of permanent magnets and the size of the market is provided. The book also includes an Appendix that provides a Glossary of Magnetic Terms to assist the readers in better understanding the technical terms used in other chapters. This book is an ideal resource for materials scientists and engineers working in academia and industry R&D. Provides an in-depth overview of all of the important families of permanent magnets produced today Includes background information on the fundamental properties of permanent magnets, major applications of each family of permanent magnets, and advances in coatings and coating technology Reviews the fundamentals of permanent magnet design
Author: Jose María Alarte
Publisher: jose mª alarte
ISBN: 8499813909
Category : Literary Criticism
Languages : en
Pages : 31
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Book Description
This arrive deals with the materials and processing contribution of CEAM (Concerted European Action on Magnets) to the science and technology of the Nd-Fe-B-type permanent magnets. The history and structure of CEAM is described, followed by some of the highlights of the work on the intrinsic and extrinsic magnetic properties and magnet processing. Possible future directions of materials research and development are considered briefly.
Author: Sam Zhang
Publisher: CRC Press
ISBN: 1498706738
Category : Science
Languages : en
Pages : 748
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Book Description
Advances in Magnetic Materials: Processing, Properties, and Performance discusses recent developments of magnetic materials, including fabrication, characterization and applications in the aerospace, biomedical, and semiconductors industries. With contributions by international professionals who possess broad and varied expertise, this volume encompasses both bulk materials and thin films and coatings for magnetic applications. A timely reference book that describes such things as ferromagnetism, nanomaterials, and Fe, ZnO, and Co-based materials, Advances in Magnetic Materials is an ideal text for students, researchers, and professionals working in materials science. Describes recent developments of magnetic materials, including fabrication, characterization, and applications Addresses a variety of industrial applications, such as aerospace, biomedical, and semiconductors Discusses bulk materials and thin films and coatings Covers ferromagnetism, nanomaterials, Fe, ZnO, and Co-based materials Contains the contributions of international professionals with broad and varied expertise Covers a holistic range of magnetic materials in various aspects of process, properties, and performance
Author: George C. Hadjipanayis
Publisher: Ave Maria Press
ISBN:
Category : Anisotropy
Languages : en
Pages : 1016
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Book Description
This volume includes the contributions to the Seventeenth International Workshop on Rare-earth Magnets and Their Applications (August 18-22, 2002, Newark, Delaware, USA). The objective is to bring together scientists and engineers of industry, government, universities, and research institutes from different backgrounds to review their current understanding of rare earth magnets and their applications, and to exchange ideas and information. The Workshop will concentrate on the practical aspects of fabrication, processing, and application of rare earth magnets, as well as on the fundamental aspects of rare earth transition metal alloys and their magnetic hysteresis behavior.
Author: Shuming Pan
Publisher: Springer
ISBN: 3642363881
Category : Science
Languages : en
Pages : 290
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Book Description
The process of high temperature phase transition of rare earth permanent-magnet alloys is revealed by photographs taken by high voltage TEM. The relationship between the formation of nanocrystal and magnetic properties is discussed in detail, which effects alloys composition and preparation process. The experiment results verified some presumptions, and were valuable for subsequent scientific research and creating new permanent-magnet alloys. The publication is intended for researchers, engineers and managers in the field of material science, metallurgy, and physics. Prof. Shuming Pan is senior engineer of Beijing General Research Institute of Non-ferrous Metal.
Author: George C Hadjipanayis
Publisher:
ISBN:
Category : Anisotropy
Languages : en
Pages : 100
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Author: I. R. Harris
Publisher: North Holland
ISBN: 9780444880086
Category : Science
Languages : en
Pages : 134
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Book Description
These papers provide an interesting collection of contributions on fundamental magnetic behaviour, microstructural studies, processing methods and applications of rare earth, iron-rich, high performance permanent magnets. The remarkably versatile nature of the Nd-Fe-B-type alloys with respect to magnet processing is very evident in these proceedings. Thus there are papers which describe the production of magnets by the die-upset-forging of melt-spun ribbon, by cold-compaction of melt-spun-ribbon with soft metals, by mechanical alloying and by hot working of cast material. Work is also reported on the production of new permanent magnets from melt-spun material based on the alloys Nd 4 Fe 78 B 18 and SmFe 11.5 Ti 1.04 . Both these alloys look promising and the former appears to be close to commercial exploitation.
Author:
Publisher: jose mª alarte
ISBN: 8499813933
Category :
Languages : en
Pages : 38
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