Preparation method of high-purity Gd/Tb/Dy/Y rare-earth metal foil

A rare earth metal and metal foil technology, applied in metal rolling and other directions, can solve the problems of inapplicability, achieve the effects of preventing oxidation, good comprehensive performance, and solving easy cracking

Inactive Publication Date: 2020-07-28
HUNAN RARE EARTH METAL MATERIAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Have not yet found relevant reports about the preparation of high-purity Gd / Tb / Dy / Y rare earth metal foils, and existing other metal and alloy foil preparation processes, for example: Chinese application CN108296304A discloses a small diameter La / Ce / The manufacturing method of Pr / Eu rare-earth metal wire, and specifically discloses that rare-earth metal wires with small diameters are obtained by obtaining rare-earth metal rods, swaging into intermediate billets, and drawing wires, which are not suitable for high-purity Gd / Tb / Dy / Y Preparation of Rare Earth Metals

Method used

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Examples

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Effect test

preparation example Construction

[0021] The preparation method of a kind of high-purity Gd / Tb / Dy / Y rare earth metal foil material provided by the present invention can comprise the following steps:

[0022] 1. Melting and casting: using commercially available high-purity Gd / Tb / Dy / Y rare earth metals with a purity of not less than 99.950% as raw materials, using a suspension melting furnace or an intermediate frequency melting furnace, melting and casting in an inert atmosphere, reducing the oxidation of raw materials degree.

[0023] 2. Machining: Use a machining car to remove the skin and cut into (Thickness is adjusted according to the actual situation, no more than 2.5 times the diameter) high-purity Gd / Tb / Dy / Y rare earth metal cylindrical blank. In this step, the oxide layer formed on the surface of the ingot due to the melting and casting process can be removed by turning the skin (the specific degree is not limited, and it can be turned until the ingot leaks metallic luster), thereby ensuring the puri...

Embodiment 1

[0030] Preparation of 0.06mm high-purity rare earth metal Tb foil:

[0031] 1. Melting and casting: using commercially available high-purity rare earth metal Tb with a purity of 99.950% as raw material, using an intermediate frequency melting furnace, melting and casting in an argon atmosphere;

[0032] 2. Machining: Use a machining car to remove the skin and cut into High-purity Tb cylindrical blank;

[0033] 3. Extrusion blanking: Put the billet into the heating furnace for preheating, use argon as the protective atmosphere, the preheating temperature is 650°C, and the preheating time is 1h, and then extrude the billet in the extruder, Obtain a strip blank with a thickness of 3.6mm;

[0034]4. Hot rolling: After cleaning the surface of the billet, carry out 8 passes of hot rolling, adjust the reduction every 4 passes, adjust the reduction rate each time to 13%, and the rolling temperature is 550°C to obtain the thickness 2.72mm metal plate;

[0035] 5. Cold rolling: Aft...

Embodiment 2

[0038] Preparation of 0.1mm high-purity rare earth metal Gd foil:

[0039] 1. Melting and casting: using commercially available high-purity rare earth metal Gd with a purity of 99.980% as raw material, using a suspension melting furnace to melt and cast in an argon atmosphere;

[0040] 2. Machining: Use a machining car to remove the skin and cut into High-purity Gd cylindrical blank;

[0041] 3. Extrusion blanking: put the billet into the heating furnace for preheating, pour in argon as a protective atmosphere, the preheating temperature is 600 ° C, and the preheating time is 2 hours, and then extrude the billet in the extrusion machine , to obtain a strip blank with a thickness of 3.6mm;

[0042] 4. Vacuum annealing: put the cooled billet into a vacuum annealing furnace, and anneal at 600°C for 2 hours in a vacuum state;

[0043] 5. Cold rolling: cold-roll the strip after vacuum annealing for 168 passes, and adjust the reduction every 6 passes, and the reduction rate is 1...

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Abstract

The invention discloses a preparation method of a high-purity Gd/Tb/Dy/Y rare-earth metal foil. According to the method, rare-earth metal with the purity of not lower than 99.95% serves as a raw material, and the rare-earth metal is one of Gd, Tb, Dy and Y; and the raw material is smelted and cast to obtain a cast ingot, and the high-purity rare-earth metal foil is obtained through machining turning for skin removal, extrusion cogging, multi-pass rolling and finishing. The problems that in the prior art, the machining difficulty is large, impurities are introduced due to the fact that hot rolling is prone to oxidation, the cold rolling production period is long, the pass deformation is low, the rejection rate is high, and edge cracking and layering are likely to occur are solved, and the blank of the high-purity Gd/Tb/Dy/Y rare-earth metal foil preparation technology is filled up; the foil with high purity, clean surface, uniform grain size, small thickness deviation and good comprehensive performance can be obtained, and the preparation method is suitable for producing neutron activation detection sheets; and the preparation method has the advantages of simple process, short period, low defective rate and fund saving, and is suitable for industrial large-scale production.

Description

technical field [0001] The invention relates to the technical field of metal materials and processing thereof, in particular to a preparation method of high-purity Gd / Tb / Dy / Y rare earth metal foil. Background technique [0002] High-purity rare earth metals (such as high-purity Gd / Tb / Dy / Y rare earth metals) are mainly used to prepare neutron activation detectors (usually made into foils), and the foils used to prepare detectors must have excellent comprehensive properties, such as High purity, uniform internal structure, and small thickness deviation. [0003] Gd / Tb / Dy / Y (gadolinium / terbium / dysprosium / yttrium) rare earth metals have excellent thermal deformation properties, but they are highly active at high temperatures and easily oxidized, so it is difficult to perform long-term and multi-pass hot rolling on them . In addition, Gd / Tb / Dy / Y rare earth metals have poor cold working performance, low deformation in each pass, long rolling time, and the product is easy to crac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/46B21B1/40B21C37/00
CPCB21B1/40B21B1/466B21C37/00
Inventor 傅臻黄美松邓月华樊玉川王志坚张闻扬贾帅广刘华黄培
Owner HUNAN RARE EARTH METAL MATERIAL RES INST
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