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Low Nb nano amorphous and minicrystal soft magnetic material and preparing method thereof

A technology of nano-amorphous and soft magnetic materials, applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problems of high cost and price, low output, etc., to reduce cost and price, improve cost performance, and broaden the scope of application Effect

Inactive Publication Date: 2009-02-25
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although nanocrystalline soft magnetic materials have good performance, saturation magnetization and magnetic permeability are much higher than ferrite soft magnets, but because the cost and price are much higher than ferrite, the output so far is far lower than that of soft ferrite.

Method used

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  • Low Nb nano amorphous and minicrystal soft magnetic material and preparing method thereof
  • Low Nb nano amorphous and minicrystal soft magnetic material and preparing method thereof
  • Low Nb nano amorphous and minicrystal soft magnetic material and preparing method thereof

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specific Embodiment

[0012] 1. Pure iron, silicon, boron, niobium and aluminum with a purity greater than 99.5% are classified as Fe 73.5 Si 13.5 B 9 Cu 1 Nb 3-x al x , the composition is proportioned, where x=0, 0.5, 1.5, 2.0, 3.0, repeated smelting in the vacuum electric arc furnace for 3-5 times to make the composition uniform, and the vacuum degree of the melting furnace is better than 3×10 -3 Pa.

[0013] 2. After the smelted ingot is cleaned, it is crushed and placed in a vacuum quenching furnace to rapidly quench into amorphous strips. The vacuum degree of the quenching furnace is better than 3×10 -3 Pa. The line speed is greater than 40m / s.

[0014] 3. The prepared amorphous strip is wound into a ring shape and placed in a vacuum furnace for annealing for 0.5-2 hours at a temperature of 600-850°C to transform the amorphous material into a nano-material. After taking out the sample, carry out Magnetic measurement, to study the influence of different aluminum (Al) substitutions of ni...

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Abstract

A nano-amorphous and minicrystal soft magnetic material with low Nb comprises Fe73.5Si13.5B9Cu1Nb3-xAlx, wherein X is larger than or equal to 0.5 and less than or equal to 2.5. The preparation method comprises the following steps: proportioning pure iron with purity larger than 99.5%, silicon, boron, niobium and aluminum according to the composition of Fe73.5Si13.5B9Cu1Nb3-xAlx; smelting three to five times in a vacuum or an electric arc furnace with argon atmosphere so as to homogenize the composition, wherein the vacuum degree is superior to 3*10Pa; pulverizing a well-smelted cast ingot after the surface of the ingot is cleaned, and placing the cast ingot in a rapid quenching furnace and quenching the cast ingot into an amorphous strips, wherein the vacuum degree of the rapid quenching furnace is superior to 3*10Pa, and the linear velocity is larger than 40m / s; and placing the well-prepared amorphous strip in a vacuum furnace for annealing, wherein 0.5-2hours is consumed, and the temperature of 600-850DEG C can enable the amorphous material to be converted into the nanometer material.

Description

1. Technical field [0001] The invention relates to the composition and preparation method of nano-microcrystalline soft magnetic materials, in particular to low-Nb (niobium) nano-amorphous and microcrystalline soft magnetic materials that use Al instead of Nb. 2. Background technology [0002] In 1988, Japanese Y.Yoshizawa et al. reported that the composition was Fe 73.5 Si 13.5 B 9 Cu 1 Nb 3- The nanocrystalline soft magnetic material has excellent soft magnetic properties and is named "Finemet". It has high saturation magnetization and high magnetic permeability, so it will soon become a new type of soft magnetic material product. Subsequently, other grades of nanocrystalline soft magnets have also come out one after another. Among them, the following two types are commonly found in the literature: NANOPERM [Fe90Zr7B3] reported in 1990; HITPERM [(Fe, Co)88M7B4Cu1, M=Zr, reported in 1998] Nb, Hf, Ta]. Although nanocrystalline soft magnetic materials have good performa...

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Application Information

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IPC IPC(8): H01F1/147H01F1/20B22F3/00C22C1/02
Inventor 都有为刘海顺
Owner NANJING UNIV