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Metallographic developing solution for superfine nickel-titanium memory alloy wire and preparation method

A nickel-titanium memory alloy and developer technology, applied in the preparation of test samples, photography, photography technology, etc., can solve problems such as difficult to cure, easy to cause danger in use and storage, and unclear display of fine structure features, etc., to reduce damage effect

Pending Publication Date: 2021-12-03
GRIKIN ADVANCED MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to enhance the developing effect, these conventional developing solutions contain highly toxic hydrofluoric acid, such as inhalation of vapor or contact with skin will cause irreversible burns
The storage conditions of liquid hydrogen fluoride are harsh, and it is prone to danger during use and storage
Conventional nickel-titanium alloy metallographic developer can show the grain boundaries, but when showing the internal structure of the microstructure grains, it is not clear about the fine structure features

Method used

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  • Metallographic developing solution for superfine nickel-titanium memory alloy wire and preparation method
  • Metallographic developing solution for superfine nickel-titanium memory alloy wire and preparation method
  • Metallographic developing solution for superfine nickel-titanium memory alloy wire and preparation method

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preparation example Construction

[0022] A method for preparing a metallographic developer for ultrafine nickel-titanium memory alloy wire, the specific steps are as follows:

[0023] 1) Determine the ratio of each component of the metallographic developer; the metallographic developer is composed of phosphoric acid, nitric acid, perchloric acid, corrosion inhibitor and water; the corrosion inhibitor is solid, and the rest are liquid components; each liquid component The volume percentage is: the phosphoric acid that the mass percentage concentration is 85%: 5~18%; The mass percentage concentration is the nitric acid of 65%: 7~24%; amount of water;

[0024] The corrosion inhibitor contains fluoride, including fluoride salts with weak acidity; the amount of corrosion inhibitor added is 1g to 5g per 100mL of liquid components.

[0025] 2) Pour the weighed water into an open glass vessel cooled with ice water according to the selected ratio.

[0026] 3) Then slowly add phosphoric acid and nitric acid one by one...

Embodiment 1

[0030] 1) Determine the ratio of each component: first select the ratio of developer components according to the wire diameter (0.16mm) and the heat treatment state of the wire, and determine the volume percentage of each liquid component as H 3 PO 4 : HNO 3 : HClO 4 :H 2 O=5:24:7:64.

[0031] 2) Pour 64mL of water into an open glass vessel cooled with ice water;

[0032] 3) Then slowly add 5mL phosphoric acid (mass percentage concentration is 85%), stir the solution, then add 24mL nitric acid (mass percentage concentration is 65%), stir evenly, when the mixed solution is still and the temperature drops to ice water temperature, slowly add 7mL azeotropic perchloric acid (mass percentage concentration is 72%), stirred gently and mixed evenly, and waited to stand still to the temperature of ice water;

[0033] 4) Finally, add 2 g of corrosion inhibitor, stir slowly, dissolve evenly, and cool to room temperature to obtain a metallographic developer.

[0034] Invade the poli...

Embodiment 2

[0045] 1) Determine the ratio of each component: firstly, select the developer component ratio according to the wire diameter (0.16mm) and the heat treatment system, and select the volume percentage of each liquid component as H 3 PO 4 : HNO 3 : HClO 4 :H 2 O=18:7:10:65.

[0046] 2) Pour 65mL of water into an open glass vessel cooled with ice water;

[0047] 3) Then slowly add 18mL phosphoric acid (mass percentage concentration is 85%), stir the solution, then add 7mL nitric acid (mass percentage concentration is 65%), stir evenly, when the mixed solution is still and the temperature drops to ice water temperature, slowly add 10mL of azeotropic perchloric acid (mass percentage concentration is 72%), stirred gently and mixed evenly, and waited to stand still to the temperature of ice water;

[0048] 4) Finally, add 5 g of corrosion inhibitor, stir slowly, dissolve evenly, and cool to room temperature to obtain the finished metallographic developer.

[0049] The polished nic...

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Abstract

The invention discloses a metallographic developing solution for a superfine nickel-titanium memory alloy wire and a preparation method, and belongs to the technical field of preparation of metallographic developing solutions. The metallographic developing solution is prepared from phosphoric acid, nitric acid, perchloric acid, a corrosion inhibitor and water. The corrosion inhibitor is a solid, and the balance is a liquid component; the volume percent of each liquid component is as follows: 5-18% of phosphoric acid; 7-24% of nitric acid; 7-25% of perchloric acid; and the balance of water. The corrosion inhibitor contains fluoride, and the addition amount of the corrosion inhibitor is 1-5 g per 100 mL of the liquid component. The nickel-titanium memory alloy metallographic developing solution can clearly display the internal morphology characteristics of nickel-titanium alloy microscopic structure grains, and is especially suitable for observing the nickel-titanium memory alloy filament metallographic structure.

Description

technical field [0001] The invention belongs to the technical field of metallographic developer preparation, and in particular relates to a metallographic developer used for ultrafine nickel-titanium memory alloy wires and a preparation method. Background technique [0002] Nickel-titanium shape memory alloy has excellent superelasticity, shape memory effect and damping performance, as well as excellent fatigue performance, biocompatibility and development resistance, as well as good comprehensive mechanical properties, so it is widely used in aerospace, ship Shipbuilding, medical and petrochemical industries. Nickel-titanium shape memory alloy filaments have excellent memory properties and superelastic properties, and are usually used in an aging state. Due to the presence of tiny inclusion structures in the alloy matrix, these inclusion-containing microstructures have a greater impact on the properties of NiTi memory alloys. Therefore, the analysis of the microstructure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32G03C5/30
CPCG01N1/32G03C5/30
Inventor 冯昭伟刘晓刘丹袁志山王江波高岩滕海涛李勇军吕保国
Owner GRIKIN ADVANCED MATERIALS
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