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Preparation method of intensified tantalum and tantalum alloy material

A tantalum alloy and preparation process technology, which is applied in the field of preparation of strengthened tantalum and tantalum alloy materials, can solve the problems of limited application range of tantalum alloy, strength increase material consumption, etc.

Inactive Publication Date: 2007-07-11
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is no more suitable method to further improve the strength of tantalum and tantalum alloys.
The low strength makes people have to increase the amount of materials, which limits the application range of tantalum alloys.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Use tantalum alloy sintered rods with the composition of Ta-9.2W-0.5Hf, melt them into alloy ingots by electron beam vacuum melting, carry out hydrogenation-crushing-dehydrogenation treatment, and obtain powders of 100 mesh to 300 mesh after sieving. The surface-hardened tantalum alloy powder particles were obtained by performing multiple low-oxygen partial pressure and oxygen-increasing treatments at 800°C, and the total oxygen content of the powder was increased from 0.02% to 0.15% of the ingot. The powder is formed by cold isostatic pressing, and the relative density of the green compact is 65%. Then put the cold isostatic pressed compact into a tantalum sheath, heat isostatic pressing after sealing and welding, the hot isostatic pressing pressure is 200MPa, the temperature is 1300°C, keep for 4 hours, and a block material with a relative density of 98.8% is obtained. The mechanical properties of the material at room temperature are: tensile strength 1303MPa, yield s...

Embodiment 2

[0023]Use the Ta-9.2W-0.5Hf tantalum alloy sintered strip with the same composition as in Example 1, melt it into an alloy ingot by electron beam vacuum melting, carry out hydrogenation-crushing-dehydrogenation treatment, and obtain a powder of 100 mesh to 300 mesh after sieving , at 300°C to 800°C for several times of low oxygen partial pressure oxygenation treatment to obtain surface-hardened tantalum alloy powder particles, the total oxygen content of the powder increased from 0.02% to 0.15% of the ingot. The powder is formed by cold isostatic pressing, and the relative density of the green compact is 65%. Then put the cold isostatic pressed compact into a tantalum sheath, heat isostatic pressing after sealing and welding, the hot isostatic pressing pressure is 200MPa, the temperature is 1300°C, keep for 4 hours, and a block material with a relative density of 98.8% is obtained. The hot isostatic pressing material was vacuum annealed at 2200° C. for 4 hours, and the relativ...

Embodiment 3

[0025] Use the Ta-9.2W-0.5Hf tantalum alloy sintered strip with the same composition as in Example 1, melt it into an alloy ingot by electron beam vacuum melting, carry out hydrogenation-crushing-dehydrogenation treatment, and obtain a powder of 100 mesh to 300 mesh after sieving , at 300°C to 800°C for several times of low oxygen partial pressure oxygenation treatment to obtain surface-hardened tantalum alloy powder particles, the total oxygen content of the powder increased from 0.02% to 0.15% of the ingot. The powder is formed by cold isostatic pressing, and the relative density of the green compact is 65%. Then put the cold isostatic pressed compact into a tantalum sheath, heat isostatic pressing after sealing and welding, the hot isostatic pressing pressure is 200MPa, the temperature is 1500°C, and it is kept for 4 hours to obtain a block material with a relative density of 99.5%. The mechanical properties of the material at room temperature are: tensile strength 1220MPa,...

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Abstract

The invention discloses a making method of high strong tantalum and tantalum alloy as reinforced microscopic tissue structure, which is characterized by the following: increasing oxygen on the surface; forming hard closed thin case structure on the surface with oxygen solid or low-valent tantalum oxide; proceeding heat isostatic pressing solidifying; obtaining dense block material; disposing in the vacuum; adjusting dynamic property of material without growing under 2200 deg. c.

Description

technical field [0001] A method for preparing strengthened tantalum and tantalum alloy materials relates to a preparation method for high-strength tantalum and tantalum alloy materials, especially a method for strengthening the microstructure of tantalum and tantalum alloy materials. Background technique [0002] There are many ways to strengthen metals, such as solid solution strengthening, precipitation strengthening, dispersion strengthening, work hardening, fine grain strengthening and particle strengthening, fiber strengthening, whisker strengthening and layered strengthening. In addition to fine-grain strengthening, the mechanism of several other strengthening methods mainly uses solute atoms and the second phase (precipitated phase, dispersed phase, added particles, fibers, whiskers, etc.) isolated in the matrix to prevent dislocations. movement to increase the deformation resistance of the metal. Fine-grain strengthening uses the property that the grain boundary str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C23C8/10B22F1/00B22F3/14B22F9/08
Inventor 张小明张廷杰刘建章胡忠武李晴宇杨雄毛郭让民白宏让丁旭
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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