Spring 2017

Microstructure and Mechanism of Coercivity Enhancement of Sintered Nd-Fe-B Magnet By Grain Boundary Diffusion
Rare earth element (REE) based Nd-Fe-B magnets have been widely used because of their excellent magnetic properties. The applications of Nd-Fe-B rare earth permanent magnets include hybrid electric vehicles (HEVs), power generators for wind turbines, high performance industrial motors, hard disk drives (HDD) for computers, travelling wave tubes for satellite communications, headphones and speakers, washing machines and other consumer electronic devices.

Recent Developments and Trends in Nd-Fe-B Magnets
Nd-Fe-B magnets have a wide variety of applications in aerospace, medical, semiconductor, telecommunications, power generation, oil & gas exploration and automotive industries.  There have been many new developments in recent years including high energy Nd-Fe-B grades, heavy rare earth free high intrinsic coecivity Nd-Fe-B grades, radially oriented anisotropic rings and improved manufacturing processes.

Eddy Current Detection of Mechanical Faults in Permanent Magnets and in Magnet Blanks Prior to Magnetization
Modern applications in automotive, energy and consumer industries apply permanent magnets in various forms. In order to achieve an optimal performance in their application, the characteristics of permanent magnets and magnet blanks prior to magnetization must be carefully controlled. Beside the accurate measurement of all three components of the magnetic field, as well as inhomogeneity measurement of the magnetic fields around permanent magnets, it is increasingly important to detect in the QA process the mechanical faults in magnets and magnet blanks, such as cracks and material inhomogeneity.

Is There an Optimum Price-Performance Metric for Permanent Magnet Materials?
Attend any magnetics conference or seminar and I can guarantee a slide will appear in someone’s presentation showing something along the lines of the year of introduction of a permanent magnet material versus the corresponding (BH)max.

Permanent Magnet Mistakes, Part Six
The sixth group of mistakes on my list are:
13. Assuming that large magnetized parts are easy and safe to handle
14. Failing to consider natural product variations in both magnetic properties and dimensions
15. Assuming that the attractive and repulsive forces are  equivalent and can be precisely calculated

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