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Preparation method of ultrathin Ta-W alloy foil

A kind of alloy foil, ultra-thin technology, applied in the direction of metal rolling, metal rolling, metal processing equipment, etc., can solve the problems that high-power high-performance microwave tubes cannot be applied, the surface quality of alloys deteriorates, and the processing performance at room temperature decreases. Achieve high room temperature strength and high temperature strength, good surface quality, and high-precision surface quality

Active Publication Date: 2013-05-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is because after adding W to Ta, the plasticity of the alloy becomes worse, and the room temperature processability decreases.
And when the thickness of the alloy foil is processed to less than 10 μm, the surface quality of the alloy becomes poor and it is easy to wrinkle
This kind of foil with poor surface quality has poor emission performance and cannot be applied to high-power and high-performance microwave tubes and traveling wave tubes.

Method used

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  • Preparation method of ultrathin Ta-W alloy foil
  • Preparation method of ultrathin Ta-W alloy foil
  • Preparation method of ultrathin Ta-W alloy foil

Examples

Experimental program
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Embodiment 1

[0037] An ultra-thin Ta-W alloy foil prepared in this embodiment has an alloy composition of: W: 5.0 wt%, and the balance is Ta.

[0038] According to the alloy composition, Ta powder with a purity of ≥99.99% and an average particle size of 5-10 μm and W powder with a purity of ≥99.99% and an average particle size of -4 Pa, the temperature is 600°C and the alloy powder is isostatically pressed, the forming pressure is 180Mpa, the holding time is 10min, and then the absolute vacuum degree is -3 The primary sintering is carried out in the environment of Pa, the sintering temperature is 2300°C, and the sintering time is 2h; after the primary sintered billet is subjected to cold rolling with a deformation of 50%, the absolute vacuum degree is -3 The secondary sintering is carried out in the environment of Pa, the sintering temperature is 2300 ℃, and the sintering time is 1h; then the secondary sintered billet is subjected to cold rolling with a deformation of 50%, and the absolute va...

Embodiment 2

[0046] A Ta-W alloy foil material for electric vacuum prepared in this embodiment, the alloy composition is: W: 6.0wt%, and the balance is Ta.

[0047] Using Ta powder with a purity ≥ 99.99% and an average particle size of 5-10 μm and W powder with a purity ≥ 99.99% and an average particle size -4 Pa, the temperature is 620°C and the alloy powder is isostatically pressed, the forming pressure is 190Mpa, the holding time is 12min, and then the absolute vacuum degree is -3 The primary sintering is carried out in an environment of Pa, the sintering temperature is 2400°C, and the sintering time is 3h; after the primary sintered billet is subjected to cold rolling with a deformation of 55%, the absolute vacuum degree is -3 The secondary sintering is carried out in the environment of Pa, the sintering temperature is 2400 ℃, and the sintering time is 0.75h; then the secondary sintered billet is subjected to cold rolling with a deformation of 55%, and the absolute vacuum degree is -3 Thr...

Embodiment 3

[0055] A Ta-W alloy foil material for electric vacuum prepared in this example, the alloy composition is: W: 7.5wt%, and the balance is Ta.

[0056] Using Ta powder with a purity ≥ 99.99% and an average particle size of 5-10 μm and W powder with a purity ≥ 99.99% and an average particle size -4 Pa, the temperature is 650°C, and then the alloy powder is isostatically pressed, the forming pressure is 200Mpa, the holding time is 15min, and then the absolute vacuum degree is -3 The primary sintering is carried out in the environment of Pa, the sintering temperature is 2500°C, and the sintering time is 4h; after the primary sintered billet is subjected to cold rolling with a deformation of 60%, the absolute vacuum degree is -3 The secondary sintering is carried out in the environment of Pa, the sintering temperature is 2500 ℃, and the sintering time is 1h; then the secondary sintered billet is subjected to cold rolling with a deformation of 60%, and the absolute vacuum degree is -3 Th...

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Abstract

The invention provides a preparation method of ultrathin Ta-W alloy foil, and belongs to the technical field of Ta-W alloy machining. The preparation method includes the steps that cyclic operation of alloy billet prepared through a powder metallurgy method, cold rolling cogging, and cold rolling and vacuum annealing, 3-5 micrometer foil annealing, and the like. The thickness of the prepared foil can reach 3-5 micrometers. The preparation method is simple in process, the prepared foil is high in precision, and compared with pure Ta foil and other Ta-W alloy foil, the ultrathin Ta-W alloy foil has the advantages of being high in strength, good in surface quality, and the like. The prepared Ta-(5.0-7.5 wt%)W alloy foil with the thickness of 3-5 micrometers is suitable for high-power microwave tubes, traveling wave tubes, and other vacuum devices of electronic components, aerospace, and other industries. The preparation method has great significance on achieving high-power high-performance microwave tube localization, improving microwave tube using performance, prolonging service life, and the like.

Description

technical field [0001] The invention relates to a preparation method of an ultra-thin Ta-W alloy foil, belonging to the technical field of Ta-W alloy processing. Background technique [0002] With the rapid development of weapon equipment and electronic device technology, high-power and high-efficiency microwave tubes play a very critical role in navigation systems, electronic anti-jamming systems and other equipment, and are also key devices in weapon equipment. [0003] Tantalum alloy ultra-thin foil is a necessary material for the cathode carrier or cathode support parts of high-power and high-efficiency microwave tubes. In foreign countries, advanced countries have developed ultra-thin tantalum alloy foils of various specifications, and are widely used in scientific research and production in industries such as electronics, aerospace, and national defense. For example, the high-power traveling wave tube PT-6049 in the AR-51 system project developed and produced by the U...

Claims

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Application Information

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IPC IPC(8): B21B1/40B21B15/00
Inventor 汪明朴陈畅王珊谭望贾延琳李周夏福中张真
Owner CENT SOUTH UNIV
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