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A cerium-gallium-based amorphous alloy prepared from low-purity raw material cerium

A technology of amorphous alloys and raw materials, applied in the field of cerium-gallium-based amorphous alloys, to achieve the effects of promoting wide application, low glass transition temperature, and reducing preparation costs

Active Publication Date: 2016-08-24
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Similar results also widely exist in iron-based amorphous alloys, such as S.J.Poon et al. using high-purity Fe (>99.9wt.%) and other high-purity elements to prepare Fe 48 Mo 14 Cr 15 Y 2 C 15 B 6 The critical diameter of amorphous alloys has reached 9mm, but Z.P.Lu and others can only prepare amorphous alloys with a critical diameter of 6mm using raw materials of industrial purity.
So far, it has not been reported to use one or more low-purity raw materials to replace high-purity raw materials to prepare amorphous alloys with higher glass-forming ability without adding other elements or changing the preparation conditions.

Method used

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  • A cerium-gallium-based amorphous alloy prepared from low-purity raw material cerium
  • A cerium-gallium-based amorphous alloy prepared from low-purity raw material cerium
  • A cerium-gallium-based amorphous alloy prepared from low-purity raw material cerium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1: prepare Ce with the cerium that purity is 93.94wt.% 70 Ga 8 Cu 22 Amorphous alloy

[0042] Using Ce with a purity of 93.94wt.% and Ga and Cu with a purity of 99.9wt.% or more, according to the chemical formula Ce 70 Ga 8 Cu 22 The atomic percentage of the alloy is prepared, and the alloy is melted in the vacuum arc melting suction casting furnace in the argon atmosphere adsorbed by titanium. The number of melting times is not less than 4 times to make the alloy composition uniform. After cooling, a master alloy ingot is obtained. Put the obtained master alloy ingot on the argon-protected water-cooled copper mold for melting, and then use the suction casting device in the electric arc furnace to use the pressure difference to suction-cast the remelted master alloy melt into a diameter of 1.5mm and 2mm cylindrical copper mold, get Ce 70 Ga 8 Cu 22 Alloy bars.

[0043] figure 2 Ce prepared for Example 1 70 Ga 8 Cu 22 The XRD pattern of the allo...

Embodiment 2

[0047] Embodiment 2: be 96.15wt.% cerium to prepare Ce with purity 70 Ga 8 Cu 22 Amorphous alloy

[0048] Using Ce with a purity of 96.15wt.% and Ga and Cu with a purity of 99.9wt.% or more, according to the chemical formula Ce 70 Ga 8 Cu 22 According to the preparation method in Example 1, a cylindrical alloy rod with a diameter of 20 mm was prepared. The physical picture of the alloy is shown in figure 1 (Left), it can be seen from the figure that the surface of the prepared alloy rod has a bright metallic luster.

[0049] The XRD curve of the alloy is as follows Figure 5 As shown, there are only diffuse steamed bread peaks on the curve in the figure, and there is no obvious sharp crystallization peak, indicating that the alloy is a completely amorphous alloy. It should be noted that 20mm is currently the largest cerium-based amorphous alloy. Unfortunately, due to laboratory mold limitations, this patent failed to prepare larger samples. Figure 6 , Figure 7 It ...

Embodiment 3-11

[0052] Embodiment 3-11: prepare Ce with the cerium that purity is 97.52-99.43wt.% 70 Ga 8 Cu 22 Amorphous alloy

[0053] With a purity of 97.52-99.43wt.% C e and Ga and Cu with a purity of more than 99.9 wt.%, according to the chemical formula Ce 70 Ga 8 Cu 22 According to the preparation method in Example 1, a cylindrical alloy rod with a critical dimension of 1-20 mm was prepared. The diameter that embodiment 5 makes is the real object of the alloy bar of 10mm see figure 1 (right). Figure 8 It is the XRD figure of embodiment 3-11. Figure 9 , Figure 10 It is the DSC test result of embodiment 3-11. Table 5 counts the thermodynamic parameters and critical dimensions of each sample prepared in Examples 3-11, and the serial number and purity of each raw material cerium are also listed in Table 5. It can be seen from the table that Ce is prepared from cerium with a purity of 97.52-99.43wt.%. 70 Ga 8 Cu 22 The critical dimension of amorphous alloy is 20mm at most a...

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Abstract

A cerium-gallium-based amorphous alloy prepared from low-purity raw material cerium. Its composition is Ce a Ga b m c , where a, b, and c are atomic fractions, 65≦a≦75, 5≦b≦15, 10≦c≦30, and a+b+c=100, where M is selected from Cu, Co, Ni A sort of. When the purity of the raw material cerium is in the range of 90-99.7wt.%, the glass-forming ability of the alloy is more excellent than that prepared by using the high-purity raw material cerium. Not only has the cerium-based amorphous alloy with the largest size of 20mm been prepared, but also a complete amorphous alloy with a critical size of 1‑20mm can be prepared. The invention greatly reduces the preparation cost of the cerium-based amorphous alloy, not only prepares the cerium-gallium-based amorphous alloy with better glass forming ability, but also maintains the low glass transition temperature of the amorphous alloy prepared from high-purity raw material cerium, good advantages such as thermal stability. The invention not only helps to promote the wide application of the cerium-based amorphous alloy, but also provides a new idea for studying the glass-forming ability of other alloy systems.

Description

1. Technical field [0001] The invention relates to the field of amorphous alloys, in particular to a cerium-gallium-based amorphous material with excellent amorphous forming ability, lower glass transition temperature and higher thermal stability prepared by using low-purity raw material cerium instead of high-purity raw material cerium alloy. 2. Background technology [0002] Amorphous alloys, since the discovery of amorphous alloys in the 1960s, have attracted great attention in many fields for their excellent mechanical properties, physical properties, chemical properties, magnetic properties and good biocompatibility. , is considered to have broad application potential. In recent years, golf heads, gears, mobile phone casings, watch dials and other products made of amorphous alloys have come out, and their performance in all aspects has been greatly improved compared with traditional alloy products. [0003] However, there are still many problems in the large-scale app...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C45/00
Inventor 张博周友
Owner HEFEI UNIV OF TECH