4D printing method of in-situ regulation of functional characteristics of nickel-titanium alloy and application

A technology of nickel-titanium alloy and functional characteristics, applied in the field of additive manufacturing, can solve the problems of high cost, difficult to control components, single composition of nickel-titanium alloy, etc., and achieve the effect of uniform performance and rapid manufacturing

Active Publication Date: 2019-11-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the powder preparation technology of additive manufacturing mainly includes gas atomization method and water atomization method. For nickel-titanium alloy powder, it is mainly prepared by rotating electrode gas atomization method, and only a single component of nickel-titanium alloy can be prepared at a time. Powder, difficult to control composition, high cost, single composition of nickel-titanium alloy for commercial application

Method used

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  • 4D printing method of in-situ regulation of functional characteristics of nickel-titanium alloy and application
  • 4D printing method of in-situ regulation of functional characteristics of nickel-titanium alloy and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Atomized powder making. Dosing is carried out according to the following atomic ratio of nickel and titanium: Ti 50.6 at.%, Ni 49.4 at.%. Nitinol rods are smelted under vacuum conditions. The rod is atomized, the obtained raw powder is collected, and screened to control the particle size of the target powder within the range of 15-53 μm.

[0028] 2. Powder modification. The nickel-titanium alloy powder (mass m 1 ) for discharge treatment. The control parameters are: voltage 130V, current 1.4A, electrode rotation speed 800r / min, the duration of each discharge treatment is 0.5h, the interval between two adjacent discharge treatments is 30min, and the number of discharge plasma treatments is 6 times. Subsequently, nickel powder with a particle size of 100 nm was added to the nickel-titanium alloy powder treated by discharge plasma, and the mass m 2 , control m 1 :m 2 =30:1, so that Ti:Ni=49.1:50.9(at.%) in the mixed powder, adjust the electrode speed to 600r / min,...

Embodiment 2

[0036] 1. Milling. Dosing according to the following atomic ratio of nickel and titanium: Ti 60 at.%, Ni 40 at.%. Nitinol rods are smelted under vacuum conditions. The rod is atomized, the obtained raw powder is collected, and screened to control the particle size of the target powder within the range of 15-53 μm.

[0037] 2. Powder modification. The nickel-titanium alloy powder (mass m 1 ) for discharge treatment. The control parameters are: voltage 120V, current control at 1A, electrode rotation speed 1000r / min, duration of each discharge treatment is 1h, interval between two adjacent discharge treatments is 45min, and discharge treatment times are 3 times. Add nickel powder with a particle size of 500nm after the original powder treatment, adding mass m 2 , control m 1 :m 2 =4.91:1, so that the atomic ratio of titanium to nickel in the mixed powder is Ti 49.2Ni 50.8 (at.%), adjust the electrode speed to 700r / min, and control the current at 1.8A, and then continue to ...

Embodiment 3

[0041] 1. Milling. Dosing according to the following atomic ratio of nickel and titanium: Ti 50 at.%, Ni 50 at.%. Nitinol rods are smelted under vacuum conditions. The rod is atomized, the obtained raw powder is collected, and screened to control the particle size of the target powder within the range of 15-53 μm.

[0042] 2. Powder modification. The nickel-titanium alloy powder (mass m 1 ) for discharge treatment. The control parameters are: voltage 125V, current control at 1.4A, electrode rotation speed 800r / min, duration of each discharge treatment is 1.5h, interval between two adjacent discharge treatments is 30min, and discharge treatment times are 3 times. Add nickel powder with a particle size of 300nm after the original powder treatment, adding mass m 2 , control m 1 :m 2 =44.4:1, so that the atomic ratio of titanium to nickel in the mixed powder is Ti 49Ni 51 (at.%), adjust the electrode speed to 500r / min, and control the current at 1.8A, and then continue to d...

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Abstract

The invention belongs to the technical field of additive manufacturing, and discloses a 4D printing method of in-situ regulation of the functional characteristics of a nickel-titanium alloy and application. A nickel-titanium alloy rod material is powdered by atomization to obtain nickel-titanium alloy powder with a particle size of 15-53 [mu]m, then the nickel-titanium alloy powder is placed in adischarge plasma-assisted ball mill for discharge treatment to promote the activity activation of the powder, and then nano-scale nickel powder with the particle size being 100-800nm is added to obtain mixed powder; the discharge treatment is continued to realize metallurgical bonding between the nickel-titanium alloy powder and the nano-nickel powder to obtain modified powder; and finally the modified powder is prepared and formed by an additive manufacturing technology to obtain the functionalized nickel-titanium alloy. The metallurgical bonding is realized by adding the nano-scale nickel powder and the large-sized spherical nickel-titanium alloy powder during the discharge treatment process, so that a bulk alloy and parts thereof with uniform composition, microstructure and performanceare prepared.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a 4D printing method and application for in-situ regulation and control of the functional properties of nickel-titanium alloys. Background technique [0002] Nickel-titanium-based shape memory alloys have excellent biocompatibility and are widely used in biomedical fields such as orthodontic wires, spinal correction rods, angioplasty rings, and micro forceps for surgery. At the same time, using its excellent shape memory effect and superelasticity, it is widely used in pipeline joints, pipeline fixing, spring drive devices, temperature controllers, temperature sensor triggers and other fields; using its high damping performance, it is widely used in vibration control Components, conical dampers and other fields; with its excellent corrosion resistance, it also has broad application prospects in the fields of chemical industry and ship parts. [0003] H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B22F9/14B22F1/00B33Y10/00B33Y70/00C22C19/03C22C14/00B22F1/14
CPCB22F9/14B33Y10/00B33Y70/00C22C19/03C22C14/00B22F2998/10B22F10/00B22F1/14B22F10/36B22F10/366B22F10/34B22F10/28B22F1/09B22F10/20Y02P10/25C22C19/007B33Y80/00B33Y50/02B33Y40/10C22C1/0433C22C1/0458B22F1/05B22F1/17B22F2999/00B22F9/10B22F2009/043B22F2202/13B22F1/00B23K26/342B23K2103/14B22F9/082B22F2009/0836B22F2301/15B22F2301/205B22F2304/10
Inventor 杨超卢海洲李元元
Owner SOUTH CHINA UNIV OF TECH
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