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A kind of ultrafine grain ta material and preparation method thereof

An ultra-fine-grained and tantalum material technology, applied in the field of ultra-fine-grained Ta material and its preparation, can solve the problems of not being suitable for industrial production of ultra-fine grained high-purity tantalum strips, affecting the performance of Ta materials, and complicated procedures, and achieving dislocation Slip suppression, large deformation, uniform distribution effect

Active Publication Date: 2019-12-03
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The above technologies can obtain ultra-fine grains of metal materials through the theory of deep plastic deformation. However, the equal-diameter angular extrusion, high-pressure rotation, hourglass extrusion method and wrinkle straightening method are generally only suitable for the processing of small-sized materials. And the process is very complicated, not suitable for industrial production of large-scale ultra-fine grain high-purity tantalum strips
Although the stack rolling method is suitable for ultra-fine grain processing of large-scale metal materials, tantalum, as a metal that easily reacts with O, H, and C, is easy to introduce impurities during the stack rolling process and seriously affects Ta. Material properties

Method used

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  • A kind of ultrafine grain ta material and preparation method thereof
  • A kind of ultrafine grain ta material and preparation method thereof
  • A kind of ultrafine grain ta material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0039] The tantalum ingot (purity 99.996%) was vacuumed at 10 -4Under the condition of Pa, carry out electron beam smelting (melting temperature is 1310°C). After ingot casting, the ingot is covered with high-purity iron in an argon chamber; three-dimensional hot forging is carried out to open the billet, the total deformation of the billet is 75%, and the billet temperature 1200°C. Remove the high-purity iron sheath on the surface of the tantalum ingot after billeting, and cool the forged billet under liquid nitrogen. After cooling completely, carry out ultra-low temperature rolling (the temperature of low-temperature cold rolling is -80~-100°C), Pass deformation 50%. The ultra-low temperature cold-rolled 50% tantalum plate is heated to 1100 ° C, and the direction perpendicular to the ultra-low temperature cold rolling rolling direction is hot-rolled here (the temperature of the hot rolling is 1100-1120 ° C), and the rolling deformation is 50%. Repeat step A, step B to 7 ti...

Embodiment 2

[0041] The tantalum ingot (purity 99.997%) was vacuumed at 10 -4 Under the condition of Pa, carry out electron beam smelting (melting temperature is 1305 ℃), after ingot casting, the ingot is sheathed with high-purity iron in an argon chamber; three-dimensional hot forging is carried out to open the billet, the total deformation of the billet is 70%, and the billet temperature 1100°C. Remove the high-purity iron sheath on the surface of the billeted tantalum ingot, cool the forged billet under liquid nitrogen, and then carry out ultra-low temperature rolling (the temperature of low-temperature cold rolling is -100~-136°C), Pass deformation 50%. The ultra-low temperature cold-rolled 50% tantalum plate is heated to 1100 ° C, and the direction perpendicular to the ultra-low temperature cold rolling rolling direction is hot-rolled here (the temperature of the hot rolling is 1100-1120 ° C), and the rolling deformation is 50%. Repeat steps A and B6 times in turn to obtain the micr...

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Abstract

The invention relates to an ultrafine grained Ta material and a preparation method thereof. Grain size of the ultrafine grained Ta material is smaller than or equal to 3 mu m; ultimate strength of thematerial is higher than or equal to 410 MPa, and yield strength is higher than or equal to 300 MPa. The preparation method of the material comprises the following steps: electron beam melting is performed on a Ta source, after ingot casting, an ingot is sheathed in a protective atmosphere; 3D hot-forging cogging is performed, total deformation of cogging is 65%-75%, and cogging temperature is 1150-1250 DEG C; after cogging, a sheath is removed, and low-temperature and high-temperature cross alternate rolling is performed; the ultrafine grained Ta material is obtained. The process is simple, and the prepared Ta ribbon has uniform and quite fine grains and is endowed with favorable strength, plasticity and toughness. The designed and prepared ultrafine grained Ta ribbon is applied to the high-technology fields of electronics, metallurgy, steel, chemical industry, hard alloys, atomic energy, superconducting technology, automotive electronics, aerospace, medical health and scientific research.

Description

technical field [0001] The invention relates to an ultrafine-crystalline Ta material and a preparation method thereof, belonging to the technical field of design and preparation of special materials. Background technique [0002] The density of tantalum is 16.68g / cm 3 , with a melting point of 2980°C. It has a series of excellent properties such as high melting point, low vapor pressure, good cold working performance, high chemical stability, strong resistance to liquid metal corrosion, and large dielectric constant of the surface oxide film. It is used in electronics, metallurgy, steel, and chemical industry. , Carbide, atomic energy, superconducting technology, automotive electronics, aerospace, medical and health and scientific research and other high-tech fields have important applications. [0003] With the continuous development of the new generation of information technology and industrial technology, in order to meet the needs of deep processing, the grain size and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18C22C1/02C22C27/02
CPCC22C1/02C22C27/02C22F1/18
Inventor 李周蒋任翔肖柱彭智龚深张立强邱文婷
Owner CENT SOUTH UNIV
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