Abstract
(Fe0.7Co0.3-xNix)88Zr7B4Cu1 nanocrystalline alloys were developed with the aim of improving the magnetic properties while keeping high Curie temperature (TC). It was revealed that Ni addition inhibited the precipitation of metastable fcc-(Fe,Co,Ni) phase hence increased thermal stability. Although the saturation magnetic flux density (Bs) showed a slight decrease, uniform nanostructure with small grain size and high volume fraction of crystals was formed with increasing Ni addition. As a result, the (Fe0.7Co0.3-xNix)88Zr7B4Cu1 nanocrystalline alloys exhibited excellent magnetic properties with a high Bs of 1.54-1.79 T, low coercivity (Hc) of 17-20 A/m and low core loss of 9.1-11.1 W/kg at 1 T and 400 Hz. The combination of high TC of 747-972 °C, low core loss as well as low material cost promised this FeCoNiZrBCu alloys broad application prospect at high temperature.
Highlights
The development of magnets for high temperature application requires new soft magnetic materials that possess (1) high magnetic flux density in small excitation magnetic field, (2) low residual magnetic induction (Br), low coercivity (Hc) and core loss (P), (3) high stability of above properties at high temperature for a long time.[1,2,3,4] The traditional magnets have been unable to meet such requirements
Nanocrystalline FeSiBNbCu,[5] FeZrBCu6,7 and FeCoZrBCu8 alloys patented under the trade name of FINEMET, NANOPERM and HITPERM are developed successively
The annealing was carried out by keeping the ribbons in the tubular furnace preheated to annealing temperature (T a) in vacuum atmosphere followed by water quenching cooling
Summary
The development of magnets for high temperature application requires new soft magnetic materials that possess (1) high magnetic flux density in small excitation magnetic field, (2) low residual magnetic induction (Br), low coercivity (Hc) and core loss (P), (3) high stability of above properties at high temperature for a long time.[1,2,3,4] The traditional magnets have been unable to meet such requirements. Nanocrystalline FeSiBNbCu,[5] FeZrBCu6,7 and FeCoZrBCu8 alloys patented under the trade name of FINEMET, NANOPERM and HITPERM are developed successively. FINEMET and NANOPERM alloys have good magnetic properties such as high effective permeability (μe), low Hc and core loss at room temperature. HITPERM alloy exhibits high Bs, high T C and good stability at high temperature. It is important to explore a nanocrystalline alloy with good soft magnetic properties, high T C as well as low material cost. FeCoNiZrBCu alloy is developed with the aim of improving soft magnetic properties. The influence of Ni addition on crystallization behavior, microstructure and soft magnetic properties in FeCoNiZrBCu alloy system were investigated
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