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Cobalt-based bulk amorphous alloy and preparation method thereof

A technology of amorphous alloys and large blocks, which is applied in the field of cobalt-based bulk amorphous alloy materials and its preparation, can solve the problem of small diameter of the largest block of cobalt-based amorphous, achieve excellent soft magnetic properties, and overcome complex processing techniques , The effect of strong amorphous forming ability

Active Publication Date: 2011-08-10
NINGBO INNOVATION CENT FOR APPLIED MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the largest bulk diameter of cobalt-based amorphous is relatively small at present, how to obtain larger-sized cobalt-based bulk amorphous alloys without significantly affecting the soft magnetic properties has become a hot issue

Method used

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  • Cobalt-based bulk amorphous alloy and preparation method thereof
  • Cobalt-based bulk amorphous alloy and preparation method thereof
  • Cobalt-based bulk amorphous alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 prepares Co 46 Fe 20 B 22 Si 6 Nb 6 large piece of metallic glass

[0029] After the Co, Fe, B, Si, and Nb components with a purity of not less than 99 wt% (weight percent) are prepared in a molar ratio of 46:20:22:6:6, they are mixed in an electric arc furnace with an argon atmosphere And smelt 3-4 times, get Co after cooling 46 Fe 20 B 22 Si 6 Nb 6 Master alloy ingot; then use the vacuum copper mold casting method to melt the ingot again, and press the master alloy melt into the copper mold to obtain the composition of Co 46 Fe 20 B 22 Si 6 Nb 6 , a bulk amorphous alloy with a diameter of 4 mm.

[0030] From such as figure 1 The shown X-ray diffraction (XRD) can prove that Co 46 Fe 20 B 22 Si 6 Nb 6 The alloy is a completely amorphous alloy. figure 2 is the physical photo of the prepared amorphous rod, where Co 46 Fe 20 B 22 Si 6 Nb 6 The bulk amorphous rod has a diameter of 4 mm. image 3 with Figure 4 for Co 46 Fe 20 B 2...

Embodiment 2-14

[0031] Example 2-14. Cobalt-based bulk amorphous alloys prepared in various proportions

[0032] Cobalt-based bulk amorphous alloys with various ratios were prepared according to the method of Example 1, and their compositions and thermophysical parameters are listed in Table 1.

[0033] Note: 1) The symbols in the table have the following meanings:

[0034] D——sample diameter under the experimental conditions; Tg ——Glass transition temperature; ΔT——Width of supercooled liquid phase region; T l - liquidus temperature; T rg ——reduced glass temperature (T rg =T g / T l );H c ——coercive force; μ e ——effective magnetic permeability; M s - Saturation magnetization.

[0035] Table 1. Composition, thermophysical and magnetic performance parameters of the cobalt-based bulk amorphous alloy of various proportionings of the present invention

[0036] Example

[0037] The cobalt-based bulk amorphous alloy provided by the invention has strong amorphous forming ability and...

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Abstract

The invention relates to a cobalt-based bulk amorphous alloy and a preparation method thereof. The alloy comprises the following components by atomic percentage: 33 to 55 percent of Co, 13 to 34 percent of Fe, 18 to 26 percent of B, 2 to 7 percent of Si, and 3 to 8 percent of Nb. Cobalt-based bulk metallic glass is proportioned according to the atomic mol ratio as required by the components, thenthe glass is forged for a plurality of times in a vacuum arc furnace, and the bulk amorphous alloy is prepared by casting in a vacuum copper mold. The bulk amorphous alloy has strong amorphous forming ability and excellent soft magnetic property, the size of the prepared amorphous material is not less than 3 millimeters at each dimensionality, the maximum size can reach 5 millimeters, the coercive force is between 1.17 and 2.35 A / m, and the maximum effective magnetic conductivity can reach 36,000 (1KHz 1A / m). The cobalt-based bulk amorphous alloy can be applied to magnetic devices in the fields of information, communication and the like.

Description

technical field [0001] The invention relates to the field of amorphous alloys, in particular to a cobalt-based bulk amorphous alloy material and a preparation method thereof. Background technique [0002] In 1960, Duwez et al. prepared AuSi-based amorphous strips for the first time by using a molten metal quenching method (W.Klement, R.H.Wilens, and Duwez, Nature., 181 (1960) 869-870). During the preparation of amorphous alloys, because of the need for very high cooling rates (10 5 K / s or more) so that it can only be a low-dimensional material in size, and amorphous alloys are mostly thin strips, filaments and fine powders. This affects the practical application of amorphous alloys. [0003] In recent years, through the improvement of preparation technology and optimization of alloy composition, people have broken through the limitation of high cooling rate, and found a variety of alloy compositions with strong amorphous forming ability. In 1974, PbCuSi-based alloys were ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C45/00C22C45/04
Inventor 沈宝龙满其奎孙怀君董亚强
Owner NINGBO INNOVATION CENT FOR APPLIED MAGNETICS CO LTD
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