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Castle, E. G.
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document
Novel "Flash Spark Plasma Sintering" method for the rapid fabrication of nanostructured and anisotropic rare-earth lean permanent magnetic materials
Abstract
In the field of ceramics processing “Flash Sintering (FS)” has generated considerable interest due to its ability to produce highly dense materials from green compacts in a matter of seconds [1]. It has been demonstrated that FS can be performed in a Spark Plasma Sintering (SPS) furnace [2]. The “Flash Spark Plasma Sintering (FSPS)” configuration can be used to perform ultra-rapid sinter-forging and sinter-annealing; and therefore represents a new route for the production of<br/>nanostructured and textured materials. We present the results of an investigation into the FSPS of Heavy Rare Earth (HRE) free Nd-Fe-B based materials (patent pending). It is shown that fully dense, highly anisotropic, nanostructured magnetic materials can be produced from isotropic powders in processing times as little as 10 seconds. The influence of the FSPS processing parameters on the physical and magnetic properties will be discussed in relation to multiscale microstructural<br/>investigations.