Download or read book Magnetic Properties of ND FE B Permanent Magnets Under Thermal Experimentation written by Géraldine Houis and published by . This book was released on 2019 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neodymium-Iron-Boron (Nd-Fe-B) magnets were developed in the 1980s, and since then, they have appeared as a common component in many fields. From the industry to consumers or defense applications, from turbines, computers, cellphones to most audio systems, Nd-Fe-B magnets are present everywhere. But when Nd-Fe-B magnets are applied to the motors of electric vehicles and wind-turbine generators, their temperature rises, therefore Nd-Fe-B-Dy magnets are used. However, while the use of these magnets is common at low temperatures, their properties decrease dramatically with the increase of temperature. In this paper, the Nd-Fe-B-based samples used were prepared by using arc melting, melt spinning, annealing (600-800°C, 10-20min), spark-plasma sintering (700°C, 30-40s), hot deformation, and grain boundary diffusion (Nd70Cu30, Pr-Cu-Al, Nd62Dy20Al18). The objective of this paper is to get a better understanding of the magnetic properties (coercivity, remanence, energy product) of these magnets under different temperatures and with slightly different compositions and processes in order to find a correlation between them.
Download or read book Modern Permanent Magnets written by John J. Croat and published by Woodhead Publishing. This book was released on 2022-01-27 with total page 455 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Download or read book Rare Earth Permanent Magnet Alloys High Temperature Phase Transformation written by Shuming Pan and published by Springer. This book was released on 2014-12-01 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Study of Sintered Magnets of the Nd Fe B Type written by and published by . This book was released on 1989 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the final report of a 3 1/2-year effort to assess the utility and limitations of Nd-Fe-B based sintered magnets for microwave devices such as traveling wave tubes. In these devices, the magnetic properties at elevated temperatures are of importance, as is the flux stability during thermal cycling and long-term exposure. The experimental work described here involved several tasks: 1) the characterization of magnets from industrial R & D laboratories and from early pilot production; 2) development of our own techniques and the capabilities for preparing Nd-Fe-B alloys and sintered magnets from them; 3) modification of the alloy compositions and heat treatments in order to improve the elevated temperature magnetic properties, making the magnets more suitable for applications in the 100 to 200 deg C range at low operating permeance values; and 4) the attempt to better understand the magnetization reversal behavior and the relationship between coercivity and microstructure. Keywords: Permanent magnets; Magnetic stability; Coercivity; Temperature compensation; Traveling wave tubes.
Download or read book Nd Fe Permanent Magnets written by I.V. Mitchell and published by Springer. This book was released on 1985 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rapidly Solidified Neodymium Iron Boron Permanent Magnets written by John J. Croat and published by Woodhead Publishing. This book was released on 2017-10-24 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rapidly Solidified Neodymium-Iron-Boron Permanent Magnets details the basic properties of melt spun NdFeB materials and the entire manufacturing process for rapidly solidified NdFeB permanent magnets. It covers the manufacturing process from the commercial production of the melt spun or rapidly solidified powder, to the production and properties of both isotropic bonded Nd and hot deformed anisotropic NdFeB magnets. In addition, the book discusses the development and history of bonded rare earth transition metal magnets and the discovery of the NdFeB compound, also covering melt spun NdFeB alloys and detailing the magnetization process and spring exchange theory. The book goes over the production of melt spinning development, the operation of a melt spinner, the processing of melt spun powder, commercial grades of NdFeB magnetic powder and gas atomized NdFeB magnetic powders. Lastly, the book touches on the major application and design advantages of bonded Nd Magnets. Features a unique perspective as the author is not only the inventor of NdFeB magnetic powder, but also played a key role in developing many of the technologies covered Provides a comprehensive look at the history, fundamental properties, production processes, design and applications of bonded NdFeB magnets Includes discussion of the rare earth supply challenge, politics, and systems as it impacts bonded NdFeB magnets
Download or read book Permanent Magnetism written by J.M.D Coey and published by Routledge. This book was released on 2019-07-16 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the first books to approach magnetism from a metal physics perspective, Permanent Magnetism presents research ideas that are being translated into commercial reality for ferrite and Nd-Fe-B magnets, and follows the discovery of interstitial, intermetallic materials. Written by well-known authors, the book contains a comprehensive yet concise treatment of the fundamental theory underlying permanent magnetism and illustrates applications with modern, permanent magnetic materials, including ceramics and intermetallic compounds. Each chapter contains worked examples to reinforce applications and the appendices include detailed mathematics and tabular data on material properties.
Download or read book Hard Magnetic Alloys written by and published by Springer. This book was released on 1992-12-16 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 19 of Group III (Crystal and Solid State Physics) deals with the magnetic properties of metals, alloys and metallic compounds. The amount of information available in this field is so substantial that several subvolumes are needed to cover it all. Subvolumes III/19a through III/19f treat the intrinsic magnetic properties, i.e. those magnetic properties which depend only on the chemical composition and the crystal structure. So far, subvolumes III/19a, III/19b, III/19c, III/19d1, III/19d2, III/19e1, III/19e2 and III/19f1 have appeared. Data on the properties that depend on the preparation of the samples measured, as for instance, thin films, amorphous alloys or the magnetic alloys used in technical applications, are being compiled in the subvolume of III/19g (Thin Films) and III/19h which covers the magnetic properties of liquid quenched alloys containing transition elements. This subvolume III/19i2 deals with the magnetic properties of hard magnetic alloys for permanent magnets. The large fields of both the well-known magnets based on 3d elements and the currently widely investigated alloys based on rare earth elements are covered. The relation between the permanent magnet properties and the various preparation techniques of the alloys has obtained special attention.
Download or read book Handbook of Advanced Magnetic Materials written by Yi Liu and published by Springer Science & Business Media. This book was released on 2005-11-23 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook of Advanced Magnetic Materials will provide a comprehensive review of recent progress in magnetic materials research. Coverage includes nanostructural effects, characterization and simulation, fabrication and processing, and properties and applications of advanced magnetic materials.The reference consists of four volumes:Volume 1 is devoted to nanostructured magnetic materials, emphasizing size effects.Volume 2 reviews both experimental methods and simulation techniques for the characterization of magnetic materials.Volume 3 outlines recent developments in processing of advanced magnetic materials. Magnetic properties cover a wide spectrum of soft magnetic materials, hard magnetic materials, recording materials, sensor materials and others.Volume 4 introduces various magnetic materials and their applications with a detailed description of the processing, properties and applications.
Download or read book The Microstructure and Magnetic Properties of NdFeB Based Permanent Magnets written by Robert James Pollard and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Micromagnetism and the Microstructure of Ferromagnetic Solids written by Helmut Kronmüller and published by Cambridge University Press. This book was released on 2003-08-28 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main theme of this book is micromagnetism and microstructure as well as the analysis of the relations between characteristic properties of the hysteresis loop and microstructure. Also presented is an analysis of the role of microstructure in the fundamental magnetic properties (for example, magnetorestriction or critical behaviour) of crystalline and amorphous alloys. The authors apply the theory of micromagnetism to all aspects of advanced magnetic materials including domain patterns and magnetization processes under the influence of defect structures. Coverage includes modern developments in computational micromagnetism and its application to spin structures of small particles and platelets. It will be of interest to researchers and graduate students in condensed matter, physics, electrical engineering and materials science, as well as to industrial researchers working in the electrotechnical and recording industry.
Download or read book Bonded Magnets written by G.C. Hadjipanayis and published by Springer. This book was released on 2003-12-31 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bonded magnets are the fastest growing sector in the entire market for magnetic materials. Their great advantages lie in the cost effective net-shape manufacturing process allowing the achievement of complex geometries and their isotropic magnetic properties. Energy products have more than quadrupled in recent years, too. The contributors to this volume present the current and future status of bonded magnets, including total world production and distribution, the markets involved, and the status of current and future applications. Current novel processing techniques are described and new developments reported, including powder production techniques, jet casting/melt spinning, atomization and DDDR processes. The different types of bonded magnets reviewed include isotropic and anisotropic neodymium-iron-boron, nanocomposites, Sm-Fe interstitial nitrides, Sm-Co and ferrites.
Download or read book Metal Ceramic and Polymeric Composites for Various Uses written by John Cuppoletti and published by BoD – Books on Demand. This book was released on 2011-07-20 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composite materials, often shortened to composites, are engineered or naturally occurring materials made from two or more constituent materials with significantly different physical or chemical properties which remain separate and distinct at the macroscopic or microscopic scale within the finished structure. The aim of this book is to provide comprehensive reference and text on composite materials and structures. This book will cover aspects of design, production, manufacturing, exploitation and maintenance of composite materials. The scope of the book covers scientific, technological and practical concepts concerning research, development and realization of composites.
Download or read book Properties and Testing of Magnetic Materials written by Thomas Spooner and published by . This book was released on 1927 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 21 1 written by David J. Sellmyer and published by 清华大学出版社有限公司. This book was released on 2005 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: 本书共分四卷,第一卷集中论述一个具体的研究领域。每一章首先对该章的基本概念和重要观念进行阐述,然后从实验和理论方面进行详细的说明,最后介绍该领域的发展前景以及新的思想。
Download or read book Anisotropy and Microstructure of High Coercivity Rare Earth Iron Permanent Magnets List of Papers Published written by TECHNISCHE UNIV VIENNA (Austria) INST OF APPLIED AND TECHNICAL PHYSICS. and published by . This book was released on 1989 with total page 211 pages. Available in PDF, EPUB and Kindle. Book excerpt: Partial Contents: Temperature Dependence of Anisotropy Fields and Initial Susceptibility in R2Fe14B Compounds; Magnetic and Anisotropy Studies of Nd-Fe-B Based Permanent Magnets; The Hard Magnetic Properties of Sintered Nd-Fe-B Permanent Magnets; Magnetic Phase Transitions and Magnetic Anisotropy in Nd2Fe(14-x)Co(x)B Compounds; Investigation of the Hysteresis Loop and the Magnetic Anisotropy of Nd-Fe-B Based Permanent Magnets; Does a Co Substitution Really Improve the Temperature Dependence of Nd-Fe-B Based Permanent Magnets; Magnetic Anisotropy in the System La2Fe(14-x)Co(x)B and its Relation to the System Nd2Fe(14-x)Co(x)B; The Effect of Substitution of Al on the Magnetic Properties of Nd15Fe78B7 Permanent Magnets; Electron Microscope Study of Precipitation in a Niobium Containing (Nd, Dy)-Fe-B Sintered Magnet; Microstructural Evidence for the Magnetic Surface Hardening of Dy203-Doped N15Fe77B8 Magnets; Magnetic Anisotropy in Pr2 (Fe(1-x)COx)14B Compounds; Anisotropy and Hysteresis Studies of Highly Substituted Nd-Fe-B Based Permanent Magnets; Electron Microscopy of Nd-Fe-B Based Magnets; and The Influence of Dopants on Microstructure and Coercivity of Nd-Fe-B Sintered Magnets. (jhd).
Download or read book Radiation induced Changes in Magnetic Properties of Nd Fe B Permanent Magnets written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The high remanence and intrinsic coercivity of Nd-Fe-B magnets make them desirable for use in the accelerators. Use in the radiation environment of an accelerator requires that the sensitivity of these magnets to radiation be determined and the mechanisms responsible be understood. We present results comparing the relative radiation sensitivity of a number of commercially available Nd-Fe-B magnets. Small samples of these magnets were irradiated at the Omega West Reactor in a neutron flux of 2 x 1013 n/cm2s at a temperature of 350°K (77°C). At various time intervals during the irradiation, samples were removed from the reactor and the open-circuit remanence measured. We also measured the second quadrant demagnetization curve of samples before and after neutron irradiation to monitor changes in remanence and intrinsic coercivity. Our results show that the sensitivity to radiation varies widely among magnets from different vendors. In general, these samples showed a decrease in the remanence and an increase in the intrinsic coercivity. We present results showing that the rate of remanence decay decreases monotonically with increasing length-to-diameter (L/D) ratio for samples of the same material. Thus, it is important to compare decay rates corrected to some constant L/D ratio. 7 refs., 3 figs., 2 tabs.
