Consolidation of Fe-Co-Nd-Dy-B Glassy Powders by Spark-Plasma Sintering and Magnetic Properties of the Consolidated Alloys

Abstract

glassy powders has been tried by spark-plasma sintering (SPS) at around the glass transition temperature in order to synthesize a hard magnetic bulk material with a nanocomposite structure. The glassy powders were consolidated into bulk forms with relative densities above 97% by the sintering at 788 K and over. The sample sintered for 420 s at 788 K had a nearly full density of 99.1% and still kept a glassy single phase. The increase in the sintering temperature and time caused crystallization and the formation of Fe 3 B phase. These as-sintered samples exhibited soft magnetic characteristics, but the soft magnetism changed to a hard type by annealing to form Nd 2 Fe 14 B, Fe 3 B and -Fe phases. The remanence, coercivity and maximum energy product for the bulk compact sintered for 420 s at 788 K, followed by annealing for 600 s at 913 K were 1.03 T, 277 kA/m and 83.1 kJ/m 3 , respectively.

SiC dispersed Fe-based glassy composite cores produced by spark plasma sintering and their high frequency magnetic properties

“…Furthermore, the SPS process is a type of compression sintering technique which is similar to hot-pressing (HP) sintering process, so that the sintered specimens with the large-size and complicated shape can be easily prepared [12,13]. Using the SPS process, large-size Zr-based [11,14,15], Cu-based [16e18], Ni-based [19e23] and Fe-based [24,25] BMGs and their composites have been fabricated.…”

Spark Plasma Sintering of Soft Magnetic Fe-Si-B-P-Cu Nanocrystalline Alloy in the Form of Magnetic Cores

“…[13][14][15][16][17][18][19] The SPS technique can prevent grain growth during compaction and facilitate formation of bulk material by maintaining the amorphous or nanocrystalline structure. In view of the excellent magnetic properties of Fe-Si-B-P-Cu alloy ribbons and the absence any report on the formation of bulk cores, here we attempted to make bulk magnetic cores of Fe 84:3 Si 4 B 8 P 3 Cu 0:7 by SPS technique.…”

Microstructure and mechanical properties of crystalline particulates dispersed Ni-based metallic glassy composites fabricated by spark plasma sintering

“…Using the SPS process, Zr-based [7,8,19], Cu-based [22,23] and Fe-based [24,25] BMG specimens have been fabricated. Recently, we have also fabricated a Ni-based BMG with a diameter of 20 mm and nearly 100% relative density by spark plasma sintering of gasatomized Ni 52.5 Nb 10 Zr 15 Ti 15 Pt 7.5 glassy alloy powder [26].…”