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Method for preparing high-purity NiTi alloy wire

An alloy wire and high-purity technology, which is applied in the field of preparation of high-purity NiTi alloy wire, can solve problems such as inability to meet market demand, and achieve the effect of ensuring precision

Active Publication Date: 2020-08-28
中科锐金山东钛业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the O element content range in domestic NiTi alloys is controlled at 0.03wt.% to 0.04wt.%, which cannot meet market demand, resulting in related products that can only be imported from abroad

Method used

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  • Method for preparing high-purity NiTi alloy wire
  • Method for preparing high-purity NiTi alloy wire
  • Method for preparing high-purity NiTi alloy wire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In this embodiment, the chemical composition of the NiTi alloy wire is: Ni 55.8wt%, the sum of oxygen and nitrogen content is 147ppm, and the balance is Ti.

[0042] The preparation method of this NiTi alloy wire material is as follows:

[0043] Step 1. Select high-purity electrolytic titanium and electrolytic nickel as raw materials. The purity of both Ti and Ni is 99.9wt%. The total content of oxygen and nitrogen in electrolytic titanium is 96ppm, and the oxygen content in electrolytic nickel is 22ppm. According to the set composition Prepare alloy raw materials, adopt vacuum induction melting and secondary vacuum consumable smelting, and obtain consumable ingots with a diameter of Φ300mm and a weight of 300kg.

[0044] Step 2. Select an air hammer or fast forging machine for billet forging. The forging temperature is 1150°C, heat for 2 hours, and the furnace charging temperature is not higher than 800°C. Blank forging to Φ170mm.

[0045] Step 3: Select a fast forgin...

Embodiment 2

[0055] In this embodiment, the chemical composition of the NiTi alloy wire is: Ni 56.3wt%, the sum of oxygen and nitrogen content is 163ppm, and the balance is Ti.

[0056] The preparation method of this NiTi alloy wire material is as follows:

[0057] Step 1. Select high-purity electrolytic titanium and electrolytic nickel as raw materials. The purity of both Ti and Ni is 99.9wt%. The total content of oxygen and nitrogen in electrolytic titanium is 91ppm, and the oxygen content in electrolytic nickel is 31ppm. According to the set composition Prepare alloy raw materials, adopt vacuum induction melting and secondary vacuum consumable smelting, and obtain consumable ingots with a diameter of Φ300mm and a weight of 300kg.

[0058] Step 2. Select the air hammer or fast forging machine for blank forging. The forging temperature is 1130°C, heat preservation for 2 hours, the furnace loading temperature is not higher than 800°C, and the blank is forged to Φ170mm.

[0059] Step 3: Se...

Embodiment 3

[0069] In this embodiment, the chemical composition of the NiTi alloy wire is: Ni 55.7wt%, the sum of oxygen and nitrogen content is 157ppm, and the balance is Ti.

[0070] The preparation method of this NiTi alloy wire material is as follows:

[0071] Step 1. Select high-purity electrolytic titanium and electrolytic nickel as raw materials. The purity of both Ti and Ni is 99.9wt%. The total content of oxygen and nitrogen in electrolytic titanium is 95ppm, and the oxygen content in electrolytic nickel is 30ppm. According to the set composition Prepare alloy raw materials, adopt vacuum induction melting and secondary vacuum consumable smelting, and obtain consumable ingots with a diameter of Φ300mm and a weight of 300kg.

[0072] Step 2. Select an air hammer or fast forging machine for blank forging. The forging temperature is 1100°C, heat for 3 hours, and the furnace temperature is not higher than 800°C. Open blank forging to Φ170mm.

[0073] Step 3: Select a fast forging mac...

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Abstract

The invention belongs to the technical field of NiTi memory alloy material processing, and specifically relates to a method for preparing a high-purity NiTi alloy wire. The NiTi alloy comprises the following chemical components according to the mass percentage: 54.5wt.%-57wt.% of Ni, no more than 200ppm of the total number of O and N elements, and the balance being Ti. High-purity titanium and high-purity nickel are used as raw materials, and the method of combining medium-frequency induction melting and twice vacuum consumable electrode arc melting is selected and used, so that the metallurgical defects can be eliminated, high-purity and high-uniformity ingots are obtained, meanwhile the process of tonner ingots is solved, and the production efficiency and the batch stability are improved. The low-oxygen and low-nitrogen raw material control and the smelting process ensure the metallurgical quality of the product; then forging and rolling are performed to obtain the wire; and finallythe hot drawing, intermediate annealing, cold drawing and straightening are performed to produce the wire finished product.

Description

technical field [0001] The invention belongs to the technical field of NiTi memory alloy material processing, and in particular relates to a preparation method of high-purity NiTi alloy wire. Background technique [0002] NiTi shape memory alloys have unique superelasticity, shape memory properties, high strength, low modulus and corrosion resistance, and are widely used in aviation, aerospace, medical, machinery manufacturing, construction and other engineering and medical fields. [0003] If the NiTi alloy contains excessive O element, it will form Ti 4 Ni 2 o x phase, which reduces the content of Ti element in the matrix, lowers the starting temperature of martensitic transformation, limits the growth of grains, and improves the strength of the alloy. The N element also forms an intermediate phase, which has the same effect as the O element. Therefore, in NiTi alloys, both O and N elements are strictly controlled. According to the ASTM F2063 standard, the O element c...

Claims

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Application Information

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IPC IPC(8): C22C19/03C22C1/02C22F1/10C21D9/00C21D9/52B21C37/04B21C1/02B21J5/00
CPCB21C1/02B21C37/04B21J5/002C21D9/0075C21D9/525C22C1/023C22C19/03C22F1/006C22F1/10
Inventor 柏春光张志强赵建杨锐
Owner 中科锐金山东钛业科技有限公司