Investigation Of Rapidly Quenched Rare Earth Iron Alloys For Permanent Magnets
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| Author | : G. C. Hadjipanayis |
| Publisher | : |
| Total Pages | : 5 |
| Release | : 1985 |
| Genre | : |
| ISBN | : |
Download Investigation of Rapidly Quenched Rare Earth Iron Alloys for Permanent Magnets Book in PDF, Epub and Kindle
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.
| Author | : I.R. Harris |
| Publisher | : Elsevier |
| Total Pages | : 144 |
| Release | : 2014-04-03 |
| Genre | : Science |
| ISBN | : 0080983634 |
Download Rare-Earth Permanent Magnets Book in PDF, Epub and Kindle
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.
| Author | : John J. Croat |
| Publisher | : Woodhead Publishing |
| Total Pages | : 384 |
| Release | : 2017-10-24 |
| Genre | : Technology & Engineering |
| ISBN | : 0081022263 |
Download Rapidly Solidified Neodymium-Iron-Boron Permanent Magnets Book in PDF, Epub and Kindle
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
| Author | : Shuming Pan |
| Publisher | : Springer |
| Total Pages | : 290 |
| Release | : 2014-12-01 |
| Genre | : Science |
| ISBN | : 3642363881 |
Download Rare Earth Permanent-Magnet Alloys’ High Temperature Phase Transformation Book in PDF, Epub and Kindle
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 | : G. C. Hadjipanayis |
| Publisher | : |
| Total Pages | : 16 |
| Release | : 1988 |
| Genre | : |
| ISBN | : |
Download Investigation of As-Cast Iron-Light Rare-Earth-Boron Alloys for Permanent Magnets Book in PDF, Epub and Kindle
The magnetic and structural properties of Fe-R-B magnets were studied in the melt-spun and sintered state. The formation of Fe14R2B phase including its magnetic properties (Curie temperature, magnetic moment and coercivity) and the effects of partial substitutions of iron, rare-earth and metalloid were studied in melt-spun samples. The magnetic properties of as-cast Fe-R-B powders were examined as a function of particle size. The fine powders were sintered into dense magnets and the properties of the magnets were examined over a range of temperatures. The magnetic properties of all samples (melt-spun, powders and sintered magnets) were correlated with the microstructure and magnetic domain structure in an attempt to elucidate the origin of magnetic hardening in these materials. The results of these studies indicate that the high coercivities are due to domain wall pinning at grain boundaries in ribbons and sintered magnets and at the surface of the particles in powders. Keywords: Permanent magnet materials; Iron; Rubidium; Boron; Magnetic hardening; Rare earth alloys. (jes).
| Author | : |
| Publisher | : |
| Total Pages | : 1572 |
| Release | : 1992 |
| Genre | : Aeronautics |
| ISBN | : |
Download Scientific and Technical Aerospace Reports Book in PDF, Epub and Kindle
| Author | : Ruel Anthony Overfelt |
| Publisher | : |
| Total Pages | : 290 |
| Release | : 1984 |
| Genre | : Alloys |
| ISBN | : |
Download Rapidly Solidified Alloys of Iron-rare Earth-boron for Permanent Magnets Book in PDF, Epub and Kindle
| Author | : Franz Lihl |
| Publisher | : |
| Total Pages | : 82 |
| Release | : 1969 |
| Genre | : |
| ISBN | : |
Download Investigations of Transition Metal Rare Earth Alloys Book in PDF, Epub and Kindle
The phase diagrams of the binary systems samarium-cobalt and gadolinium-cobalt have been established. The phases present have been checked by X-ray diffraction and X-ray fluorescence methods. The ternary system yttrium-iron-cobalt has been investigated in three essential concentration regions corresponding to the compositions Y(Fe, Co)2, Y(Fe, Co)5 and Y2(Fe, Co)17. Only in the case of Y2(Fe, Co)17 complete solid solubility has been found, the other series show only limited ranges of solid solubility. By the amalgam process the preparation of RECo5 and RE(Co, Cu)5 alloys has been studied. The results have been compared with alloys, prepared by high frequency melting. Quenched alloys of the composition RE(Co, Cu)5 show complete solid solubility. By static and dynamic magnetic measurements the permanent magnet properties of RECo5 alloys, prepared by high frequency melting and by the amalgam process have been measured. The influence of different milling methods and of different chemical treatments on the magnetic properties have been determined. Alloys, prepared by the amalgam process are superior to other alloys respective of their permanent magnetic properties. (Author).
| Author | : R.W. Cochrane |
| Publisher | : Elsevier |
| Total Pages | : 590 |
| Release | : 1988-01-01 |
| Genre | : Technology & Engineering |
| ISBN | : 0080984827 |
Download Rapidly Quenched Metals 6: Volume 3 Book in PDF, Epub and Kindle
Rapidly Quenched Metals 6: Volume 3
| Author | : I. R. Harris |
| Publisher | : North Holland |
| Total Pages | : 134 |
| Release | : 1989-01-01 |
| Genre | : Science |
| ISBN | : 9780444880086 |
Download Rare-earth Permanent Magnets Book in PDF, Epub and Kindle
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.
