Landolt-Börnstein - Group III Condensed Matter

7.2.3.4 Melt-quenched magnets

Abstract

This chapter discusses alloy preparation, melt-spinning, and compaction processes used in the manufacture of melt-quenched magnets. The alloys are prepared by induction melting in an argon gas atmosphere. The alloy ingots are transferred to a melt spinner, where they are remelted by induction heating and injected onto a rapidly spinning wheel through an orifice by the pressure of an injection gas (Ar). The optimum rate is considered to be the quenching rate that produces fine crystals of R2Fe14B in the quenched melt-spun materials whose diameter ranges between 20 nm and 80 nm. The compaction of the fragments of the melt-spun ribbons is performed in three different ways (type I, type II and type III). Maximum energy product versus wheel velocity ν s, of the spinner and dependence of the demagnetization curves on the substrate velocity ν of Nd-Fe-B, dependence of the coercivity MHc on the substrate velocity νs of Nd-(Fe-B) are shown. Temperature dependence of coercivity and remanent magnetic flux density of hot-pressed and die-upset magnets of Nd-Fe-B, intrinsic coercive force MHc versus temperature T of Nd-Fe-B, dependence of the coercivity, saturation magnetic moment and maximum energy product on the composition of Pr-Fe-B-Si, and dependence of the coercivity, saturation magnetic moment and maximum energy product on composition of Pr-Fe-Co-(B-Si) are also figured out.

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Title
7.2.3.4 Melt-quenched magnets
Book Title
Magnetic Alloys for Technical Applications. Hard Magnetic Alloys
In
7.2.3 Nd{2}Fe{14}B-type magnet alloys
Book DOI
10.1007/b41058
Chapter DOI
10.1007/10028076_45
Part of
Landolt-Börnstein - Group III Condensed Matter
Volume
19I2
Editors
  • H. P. J. Wijn
  • Authors
  • H. P. J. Wijn
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