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A kind of processing method of superelastic nickel-titanium alloy wire

A technology of a nickel-titanium alloy and a processing method is applied in the processing field of superelastic nickel-titanium alloy wire, which can solve the problems of difficulty in taking into account superelasticity and bending fatigue performance, and achieve the effect of improving bending fatigue performance.

Active Publication Date: 2022-06-10
陕西兴硕新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, cold drawing and heat treatment are generally used to obtain nickel-titanium alloy wire with good superelasticity, but it is difficult to take into account its bending fatigue performance
Or change the phase composition of nickel-titanium alloy wire through long-term aging to obtain good bending fatigue performance, but it is difficult to take into account its superelasticity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Processing superelastic Nitinol wire with high bending fatigue of Φ0.70mm. First, the annealed Φ0.81 nickel-titanium alloy wire with an elongation rate of 46% and a section shrinkage rate of 56% is axially stretched, and the axial stretching rate is 0.005s. -1 , the axial tensile strain is 35%, and the radial uniform deformation reaches 26%. Unloading is performed, and then the unloaded wire is subjected to strain heat treatment at 350 ° C for 30 minutes, and the axial strain of the strain heat treatment is 1%, that is, it is obtained. After 6% strain loading and unloading, the residual strain is 0.20% (<0.5%), and the number of bending fatigue tests is 44085.

Embodiment 2

[0031] Process superelastic Nitinol wire with high bending fatigue of Φ0.80mm. First, the annealed Φ0.91 nickel-titanium alloy wire with 48% elongation and 60% section shrinkage was axially stretched, and the axial stretching rate was 0.15s. -1 , the axial tensile strain is 28.4%, and the radial uniform deformation reaches 23%. Unloading is carried out, and then the unloaded wire is subjected to strain heat treatment at 500 ° C for 20 minutes, and the axial strain of the strain heat treatment is 1.5%. After 6% strain loading and unloading, the residual strain is 0.07% (<0.5%), and the number of bending fatigue tests is 37943.

Embodiment 3

[0035] Process superelastic Nitinol wire with high bending fatigue of Φ0.60mm. First, axially stretch the Φ0.66 annealed nickel-titanium alloy wire with an elongation rate of 40% and a section shrinkage rate of 30%, and the axial stretching rate is 0.25s. -1 , the axial tensile strain is 22%, unloading is carried out when the radial uniform deformation reaches 18%, and then the unloaded wire is subjected to strain heat treatment at 400 ° C for 20 minutes, and the axial strain of the strain heat treatment is 1.2%, that is, it is obtained. After 6% strain loading and unloading, the residual strain is 0.22% (<0.3%), and the number of bending fatigue tests is 78581.

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Abstract

The invention discloses a processing method for a superelastic nickel-titanium alloy wire, which is specifically implemented according to the following steps: step 1, axially stretching the annealed nickel-titanium alloy wire at room temperature; The radial direction of the nickel-titanium alloy wire produces uniform deformation within the entire length of the wire, and the radial uniform deformation is 18-26%. Step 2, unloading the axially stretched nickel-titanium alloy wire; step 3, performing strain heat treatment on the unloaded nickel-titanium alloy wire, to obtain a superelastic nickel-titanium alloy wire with improved bending fatigue performance. The bending fatigue performance of the superelastic nickel-titanium alloy wire is improved, and the superelasticity and bending fatigue performance of the nickel-titanium alloy are taken into account.

Description

technical field [0001] The invention belongs to the technical field of nickel-titanium shape memory alloy wire processing, and relates to a processing method of superelastic nickel-titanium alloy wire. Background technique [0002] Nickel-titanium shape memory alloys have been widely used in the fields of aerospace, aviation, construction, biomedicine and daily life due to their shape memory effect and related superelasticity, especially in the field of biomedicine, such as Root canal files made of nickel-titanium alloy wire are widely used in oral root canal treatment. [0003] Nickel-titanium alloy root canal files need to be bent and rotated to adapt to the complex pulp structure. Therefore, the nickel-titanium alloy wire for processing root canal files is required to have good superelasticity and bending fatigue properties to improve its service life and prevent A medical accident in which the root canal file broke during treatment. At present, nickel-titanium alloy wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/10
CPCC22F1/006C22F1/10
Inventor 于孟杨阳
Owner 陕西兴硕新材料科技有限公司
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