High-iron content Fe-Si-B-P-Cu-Nb amorphous and nanocrystalline soft magnetic alloy and preparation method

Abstract

The invention discloses a high-iron content Fe-Si-B-P-Cu-Nb series amorphous and nanocrystalline alloy and a preparation method. A chemical composition expression of the alloy is FeaSibBcPdCueNbf, where a, b, c, d, e and f correspondingly represent the atomic percentages of various corresponding components of Fe, Si, B, P, Cu and Nb, and the following conditions: 85.5<=a<=86.5, 1<=b<=2, 8<=c<=9.8,2.6<=d<=4, 0<=e<=1, 0<=f<=0.55, and a+b+c+d+e+f=100 are achieved. The alloy is low in cost, a quenched state nanocrystallization soft magnetic thin band and a quenched state amorphous soft magnetic thin band can be prepared through an existing single-roller rotating quenching technology; due to adding of a little amount of the Cu and Nb elements, the amorphous forming capacity, the toughness andthe saturation magnetization strength of the alloy are improved, and the grain size of nanocrystalline is refined. The saturation magnetization strength of the quenched state nanocrystalline thin bandin the alloy reaches 1.82 T. After crystallization annealing of the amorphous thin band, the saturation magnetization strength of the nanocrystalline thin band reaches 1.84 T. The prepared amorphousand nanocrystalline alloy serves as a motor, a mutual inductor and other devices to be applicable to the fields of electric power industry transformer iron cores, inverter welding machines, new energy, wireless charging, digital, automation and the like.

Description

technical field [0001] The invention belongs to the field of amorphous and nanocrystalline alloys, in particular to a Fe-Si-B-P-Cu-Nb series amorphous and nanocrystalline alloy with high iron content and high saturation magnetization. Background technique [0002] Amorphous alloys refer to alloys in which the arrangement of atoms in the internal structure is characterized by long-range disorder and short-range order. When the cooling rate is large enough, the viscosity of the alloy increases rapidly, the time required for atoms or molecules to reach internal equilibrium is delayed by an order of magnitude, and the crystallization process does not have time to occur, so that the disordered liquid structure is preserved and an amorphous alloy is formed. . In the late 1960s, with the advent of Fe-based amorphous alloys, it was found that it has good ferromagnetism. The silicon steel sheets currently used as transformer cores have the disadvantages of high loss and complicated...

AI Technical Summary

Problems solved by technology

At present, the mainstream of commercial nanocrystalline alloys is still Finemet alloys, and the alloy system is FeCuNbSiB. The magnetic permeability of this alloy has reached more than 100,000, but its saturation magnetization is low (B s =1.25T), which limits its application in power electronic small devices and power transformers

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