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Annealing and strengthening technological method for rolled pure tantalum foil

A tantalum foil and annealing technology, which is applied in the annealing field of rolled tantalum foil, can solve the problems that cannot further meet the performance requirements of tantalum foil, general mechanical properties, etc., and achieve the effect of improving mechanical properties, tensile strength and plastic deformation

Active Publication Date: 2020-07-24
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Tantalum foil is generally obtained by metal foil materials prepared by multiple rolling + intermediate annealing processes, but the mechanical properties of existing tantalum foils after the intermediate annealing process are average, which cannot further meet the production requirements for the performance of tantalum foil products

Method used

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  • Annealing and strengthening technological method for rolled pure tantalum foil
  • Annealing and strengthening technological method for rolled pure tantalum foil
  • Annealing and strengthening technological method for rolled pure tantalum foil

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The tantalum foil with a thickness of 100 μm and a rolling deformation of 50% in this embodiment has the following mechanical properties: the yield strength is 520 MPa, and the elongation after fracture is 1.1%.

[0037] A method for annealing rolled pure tantalum foil provided in this embodiment, the annealing process is as follows:

[0038] Surface treatment: tantalum foil with a rolling deformation of 50% needs to be pickled before annealing. The pickling solution is a mixed solution of 25% to 30% nitric acid, 5% to 10% hydrofluoric acid and water. Pickling time is 30s ~ 60s, then rinse with water first, then with alcohol, and finally dry in an oven to remove impurities and oil on the surface of the foil.

[0039] Vacuum packaging: Since metal tantalum is easily oxidized by reacting with oxygen at high temperature, it is necessary to carry out vacuum packaging treatment on tantalum foil before annealing treatment, and the vacuum used for packaging is 1×10 -3 Pa.

...

Embodiment 2

[0045] In this example, a tantalum foil with a thickness of 100 μm and a rolling deformation of 60% is rolled, and its mechanical properties are: the yield strength is 600 MPa, and the elongation after fracture is 1.0%.

[0046] In this example, the surface treatment and vacuum packaging of the tantalum foil with a cold rolling deformation of 60% are carried out as in Example 1, and then the tantalum foil after surface treatment and vacuum packaging is annealed in a box furnace, and the annealing temperature is 700°C. Heat preservation time 1h, then air-cool to room temperature.

[0047] Such as Figure 4 as shown, Figure 4 It is the metallographic diagram of embodiment two tantalum foil; From Figure 4 It can be seen that the grains of the tantalum foil are still a typical rolling structure, and the grains show no sign of recrystallization, and still maintain the shape elongated along the rolling direction, which shows that the tantalum foil is kept at 700°C for 1h under t...

Embodiment 3

[0051] In this example, a tantalum foil with a thickness of 100 μm and a rolling deformation of 60% is rolled, and its mechanical properties are: the yield strength is 600 MPa, and the elongation after fracture is 1.0%.

[0052] In this example, the surface treatment and vacuum packaging of the tantalum foil with a cold rolling deformation of 60% are carried out as in Example 1, and then the tantalum foil after surface treatment and vacuum packaging is annealed in a box furnace, and the annealing temperature is 750°C. Heat preservation time 1h, then air-cool to room temperature.

[0053] Such as Figure 7 as shown, Figure 7 It is the metallographic diagram of embodiment three tantalum foil; From Figure 7 It can be seen that the grains of tantalum foil are still a typical rolling structure, and the grains do not show signs of recrystallization, and still maintain the shape of elongation along the rolling direction, which shows that the tantalum foil is kept at 750°C for 1h....

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Abstract

The invention discloses an annealing and strengthening technological method for a rolled pure tantalum foil. The method comprises: surface treatment; vacuum packaging; and vacuum annealing treatment of rolled pure tantalum foil, wherein the rolling deformation of the rolled pure tantalum foil is not less than 50%, an annealing temperature is 700 DEG C-850 DEG C, holding time is 1 h-1.5 h, and aircooling is performed after the heat preservation is completed. The annealing method of rolled tantalum foil disclosed by the present invention can significantly improve the tensile strength of rolledpure tantalum foil and the plastic deformation, indicating that mechanical properties of the rolled tantalum foil can be improved through an annealing process of the present invention.

Description

technical field [0001] The invention relates to the technical field of heat treatment technology of metal materials, in particular to an annealing method of rolled tantalum foil. Background technique [0002] Metal tantalum has the characteristics of high melting point, high density, corrosion resistance, and good ductility, and is widely used in the fields of electronics industry and alloy industry. With the development of science and technology and the evolution of the concept of miniaturization, the application of miniaturized products is becoming more and more extensive. . Tantalum foil can be used as a solid electrolytic capacitor with large capacity, small size and stable performance. It is used in radars, missiles, supersonic aircraft and electronic computers, and can also be used as materials for electronic emission tubes and high-power electronic tube parts. The preparation of miniaturized products urgently requires a large number of metal foils with small sizes (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/46C22F1/02C22F1/18C23G1/10
CPCC21D9/46C22F1/18C22F1/02C23G1/106
Inventor 王珊司登辉陈畅王磊杨圣尧曹振新张真
Owner HEFEI UNIV OF TECH
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