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Investigation of Rapidly Quenched Rare Earth Iron Alloys for Permanent Magnets

1985
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Release : 1985
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Book Synopsis Investigation of Rapidly Quenched Rare Earth Iron Alloys for Permanent Magnets by : G. C. Hadjipanayis

Download or read book Investigation of Rapidly Quenched Rare Earth Iron Alloys for Permanent Magnets written by G. C. Hadjipanayis. This book was released on 1985. Available in PDF, EPUB and Kindle. Book excerpt: In early in 1985 the potential of FeNd (Pr) B (SI) alloys for permanent magnet development was demonstrated. The progress under consideration was initiated in April 1983, to study the properties of these materials in more details and in particular to understand the origin of magnetic hardening by correlating the magnetic properties with the microstructure determined by transmission electron microscopy. The magnetic properties of melt-spun Fe-R-B alloys have been examined in the whole rare-earth series. The tetragonal Fe14R2B phase occurs in all alloys studied except in Eu and Yb containing alloys. The Curie temperature of this phase increases from about 170C in Fe14CeB to 375 for Fe14Gd2B and then decreases for the heavier rare-earths and is only 320 C in Fe14Ho2B. In heavy rare-earths, a second phase with a higher Curie temperature approx.(470 C) has also been observed. The nature of this phase is not yet known. The magnetic hysteresis properties of melt-spun Fe-light rare-earth-boron alloys were examined and maximum coercivities were found to scale with the anisotropy fields.

Rare-Earth Permanent Magnets

2014-04-03 Science
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Release : 2014-04-03
Genre : Science
Kind : eBook
Book Rating : 634/5 ( reviews)

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Book Synopsis Rare-Earth Permanent Magnets by : I.R. Harris

Download or read book Rare-Earth Permanent Magnets written by I.R. Harris. This book was released on 2014-04-03. Available in PDF, EPUB and Kindle. Book excerpt: 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 Nd4Fe78B18 and SmFe11.5Ti1.04. Both these alloys look promising and the former appears to be close to commercial exploitation.

Rare Earth Permanent-Magnet Alloys’ High Temperature Phase Transformation

2014-12-01 Science
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Release : 2014-12-01
Genre : Science
Kind : eBook
Book Rating : 881/5 ( reviews)

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Book Synopsis Rare Earth Permanent-Magnet Alloys’ High Temperature Phase Transformation by : Shuming Pan

Download or read book Rare Earth Permanent-Magnet Alloys’ High Temperature Phase Transformation written by Shuming Pan. This book was released on 2014-12-01. 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.

Rapidly Solidified Neodymium-Iron-Boron Permanent Magnets

2017-10-24 Technology & Engineering
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Release : 2017-10-24
Genre : Technology & Engineering
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Book Rating : 263/5 ( reviews)

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Book Synopsis Rapidly Solidified Neodymium-Iron-Boron Permanent Magnets by : John J. Croat

Download or read book Rapidly Solidified Neodymium-Iron-Boron Permanent Magnets written by John J. Croat. This book was released on 2017-10-24. 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

Investigation of Crystalline Iron-Platinum Nickel and Amorphous Rare Earth-Iron Alloys for Permanent Magnets

1983
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Release : 1983
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Book Synopsis Investigation of Crystalline Iron-Platinum Nickel and Amorphous Rare Earth-Iron Alloys for Permanent Magnets by : G. C. Hadjipanayis

Download or read book Investigation of Crystalline Iron-Platinum Nickel and Amorphous Rare Earth-Iron Alloys for Permanent Magnets written by G. C. Hadjipanayis. This book was released on 1983. Available in PDF, EPUB and Kindle. Book excerpt: Samarium-cobalt magnets have large-energy products but their cost is relatively high because of the use of expensive Sm and Co. A recent trend has been observed in industry to encourage conservation of cobalt and to find possible substitutes for this strategic material. The purpose of this program was to develop a permanent magnet without the use of cobalt which could be substituted for the AlNiCo commercial magnets. A number of magnetic materials were identified with properties that could be exploited in permanent magnet development. Contents: Experimental Techniques; Praseodymium-Iron-Gallium Alloys; Ternary Rare-Earth System; Praseodymium(Misch-Metal)-Terbium-Iron-Cobalt-Glass Former; Praseodymium-Iron(cobalt)-Glass Former; Iron-Platinum Based Alloys; Appendix: 'Characterization Studies of Rare Earth-Iron Magnetic Materials.

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