CN105910989A - Preparation method for carbon nanotube laser ultrasonic enhancement layer material - Google Patents
Preparation method for carbon nanotube laser ultrasonic enhancement layer material Download PDFInfo
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- CN105910989A CN105910989A CN201610219421.2A CN201610219421A CN105910989A CN 105910989 A CN105910989 A CN 105910989A CN 201610219421 A CN201610219421 A CN 201610219421A CN 105910989 A CN105910989 A CN 105910989A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
- G01N2021/1706—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids in solids
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
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Abstract
The invention relates to a preparation method for a carbon nanotube laser ultrasonic enhancement layer material. The method comprises the following steps: mixing modified carbon nanotubes with absolute alcohol so as to obtain a first mixed solution; mixing the first mixed solution with poly(dimethyl pheyl siloxane) so as to obtain a second mixed solution; and stirring the second mixed solution with a magnetic stirring machine and successively carrying out ultrasonic dispersion by an ultrasonic oscillator, standing and extraction of bubbles so as to obtain the carbon nanotube laser ultrasonic enhancement layer material. The carbon nanotube laser ultrasonic enhancement layer material prepared in the invention plays an important role in laser nondestructive testing of wheels riding on rails of a railway; the material is an important component of high-strength laser ultrasonic non-contact nondestructive test and core technology and is of critical significance to realization of on-line non-contact nondestructive inspection; and the material is capable of preventing the surface of a sample from ablation damage and exerts protection effect on to-be-tested workpieces.
Description
Technical field
The present invention relates to laser-ultrasound field and the crossing domain of nanometer new material, be specifically related to a kind of carbon
Nanotube is combined the preparation method of optoacoustic reinforcing membrane material.
Background technology
CNT (Carbon nanotube) with its high transverse and longitudinal and superpower mechanical performance and
Excellent heat conduction power becomes the one-dimensional material of great potential.CNT has good mechanics
Performance, absorbing ability and conductive capability that wherein CNT is excellent make it have laser-ultrasound enhancing
Well help.
Laser ultrasonic detection technology is to utilize laser pulse to irradiate sample surfaces, inspires ultrasound wave, and
Utilize optical means that ultrasound wave is detected, thus realize sample is carried out the one side of Non-Destructive Testing
Method.It is along with modern science and technology and industrial expansion, and range of application is more and more wider.But swash in the past
The when of light Ultrasonic NDT, owing to thermoelastic excitation ultrasound signal is the faintest, swashed by ablation process
Send out ultrasound energy and be greatly improved excitation intensity, but have certain infringement for surface of the work to be detected.One
In the case of as, it is by permissible at surface of the work to be detected one layer of water of spray or an oil dripping when detection
It is prevented effectively from surface of the work damaged and can also to a certain degree improve the intensity of excitation ultrasound, this skill
Art is called sacrificial layer technology.Although this technology does not damage parts with microstructure, but this mode excitation ultrasound
Intensity be also unable to reach the requirement of non-contact laser Ultrasonic NDT.
Summary of the invention
It is an object of the invention to make a kind of CNT laser-ultrasound enhancement layer material so that it is improve and excite
Ultrasonic amplitude.
For achieving the above object, the invention provides the preparation of a kind of carbon nanometer laser ultrasonic enhancement layer material
Method:
Described modified carbon nano-tube is mixed with anhydrous alcohol, the scale of the two is scheduled on 1:1-1:3 it
Between, stir, allow modified residual nanotube fully infiltrate in toluene solvant.
Described modified carbon nano-tube is mixed with polydimethylsiloxane (PDMS) with anhydrous alcohol mixture,
The two ratio is between 1:10-1:20, with magnetic stirrer by this CNT mixed liquor after both mixing
Stir 10 minutes, then use sonic oscillation instrument ultrasonic disperse 4-6 minute, stand 4-5 hour, then
Use supersonic oscillations instrument ultrasonic disperse 4-6 minute again.
Stand in being placed on vacuum drying oven after described mixed liquor is stood one hour and extract institute's band gas in liquid
Bubble.Stand extraction bubble.The time standing extraction bubble was greater than equal to 2 hours, obtained carbon nanometer
Pipe optoacoustic conversion layer material.
Described CNT optoacoustic conversion layer material is coated uniformly on test button surface, the thickness of coating
Degree is 100 μm-500 μm.
Compared with prior art, the invention have the advantages that
The present invention compares at the direct excitation ultrasound of steel patterned surface, with the addition of CNT optoacoustic enhancement layer material
After material, the ultrasonic sound field of excitation laser there occurs substantially change.It is beneficial to detection process and result with upper type,
Because actually detected main utilization is compressional wave, the most multidirectional compressional wave of sound field energy is concentrated, vertically downward vertical
Ripple makes the position of receiving transducer determine, can reduce portion of energy loss simultaneously.
The existence of the present invention improves the amplitude of excitation ultrasound in non-contact laser ultrasonic system, excites
The raising of ultrasonic energy makes the antimierophonic ability of whole laser ultrasonic system improve, and reduces later stage letter
Number process difficulty.
Accompanying drawing explanation
The preparation side of a kind of CNT laser-ultrasound enhancement layer material that Fig. 1 provides for the embodiment of the present invention
Method flow chart；
Fig. 2 is that the embodiment of the present invention utilizes transmission beam method to receive laser-ultrasound experiment schematic diagram；
Fig. 3 is that the present invention tests schematic diagram for detecting flaw of wheel.
Detailed description of the invention
Below by drawings and Examples, technical scheme is described in further detail.
The preparation side of a kind of CNT laser-ultrasound enhancement layer material that Fig. 1 provides for the embodiment of the present invention
Method flow chart.As it is shown in figure 1, this preparation method includes step S101-S103:
In step S101, described modified carbon nano-tube is mixed with anhydrous alcohol, it is thus achieved that the first mixed liquor；
Specifically, modified carbon nano-tube is mixed with anhydrous alcohol, the scale of the two is scheduled on 1:1-1:3
Between, stir, allow modified residual nanotube fully infiltrate in toluene solvant.
In step S102, described first mixed liquor is mixed with polyxylene radical siloxane, it is thus achieved that the second mixing
Liquid；
Concrete, the first mixed liquor is 1:10-1:20 with the ratio of described polyxylene radical siloxane.
In step S103, described second mixed liquor magnetic stirrer is stirred, uses supersonic oscillations instrument
Ultrasonic disperse, stand, extract and obtain CNT laser-ultrasound enhancement layer material after bubble；
Concrete, the second mixed liquor magnetic stirrer is stirred 10 minutes, ultrasonic with supersonic oscillations instrument
Disperse 4-6 minute, stand 4-5 hour, again with supersonic oscillations instrument ultrasonic disperse 4-6 minute,
Place it in vacuum drying oven after standing 1 hour, obtain CNT laser-ultrasound after extraction bubble and increase
Strong layer material.
Fig. 2 is that the embodiment of the present invention utilizes transmission beam method to receive laser-ultrasound experiment schematic diagram.As in figure 2 it is shown,
The optical pulse energy of laser instrument is 400,000,000 burnt (MJ), and the pulse recurrence frequency of laser instrument is 10 hertz (HZ).
Coating one layer of above-mentioned prepared optoacoustic enhancement layer material at test block surface, the thickness of sprayed coating is about 100
μm-500μm.Laser straight takes excitation ultrasound signal on optoacoustic enhancement layer material, at the test block back side
Then receive ultrasonic with ultrasonic longitudinal wave probe with being coated with last layer ultrasonic coupling agent, detect and receive signal
Peak-to-peak value is 60.6 volts (V).
Described process and bloom surface directly accept laser-ultrasound experiment and contrast, and are specifically described as: swash
The optical pulse energy of light device is 400,000,000 burnt (MJ), and the pulse recurrence frequency of laser instrument is 10 hertz (HZ).
It is not coated by one layer of above-mentioned prepared optoacoustic enhancement layer material at test block surface.Laser is straight at firm specimen surface
Connect excitation ultrasound, detect that the peak-to-peak value receiving signal is 2.2 volts (V).
The Amplitude Ratio bloom of excitation ultrasound after adding the present invention in transmission beam method receives laser-ultrasound experiment
The amplitude of the direct excitation ultrasound in surface is high 30 times.Compared by above-mentioned experiment, demonstrate optoacoustic enhancement layer
Material effectiveness and practicality to increasing laser-ultrasound amplitude.
Fig. 3 is that the present invention tests schematic diagram for detecting flaw of wheel.As it is shown on figure 3, according to the one of the present invention
Plant implementation method and be particularly applicable in detecting flaw of wheel reality, being specifically described as: first, prepare this carbon nanometer
Pipe optoacoustic reinforcing membrane material, preparation method is described above.Then by this optoacoustic reinforcing membrane material spraying at car
On wheel tread, the thickness sprayed is 100 μm-500 μm, then launches laser with pulse laser and beats
Wheel surface, receives laser excitation by Air Coupling ultrasonic transducer and to run into defect in test block anti-
Be emitted back towards is ultrasonic, and the distance between Air Coupling ultrasonic transducer and wheel tread is 2-6 centimetre
(cm)。
Wherein, Air Coupling probe described above accepts the artificial of laser excitation ultrasonic experiments and wheel
The size of defect is relevant with the degree of depth, is 3 centimetres (cm) for the degree of depth, and the length of side is 2 centimetres (cm)
Square hole, the ultrasonic signal of reception through amplifying circuit 40 decibels (dB) amplify after.Receive letter
Number on oscillograph, it is observed 1.5-1.7 volt (V).
The embodiment of the present invention when laser instrument individual pulse energy is higher, depositing of optoacoustic enhancement layer material
Can effectively prevent the ablated damage of specimen surface, protect measured workpiece.And this CNT laser
Ultrasonic photoacoustic enhancement layer material is compared the laser straight of laser instrument transmitting and is taken the feelings on steel plate sample surface
Condition, the amplitude of the excitation ultrasound that with the addition of optoacoustic enhancement layer material improves 20-30 times by comparison.
Substantially increase the ultrasonic amplitude of laser excitation and laser is converted to ultrasonic optoacoustic conversion efficiency.
It should be noted last that, above example only in order to technical scheme to be described and unrestricted,
Although being described in detail the present invention with reference to preferred embodiment, those of ordinary skill in the art should
Understand, technical scheme can be modified or equivalent, without deviating from skill of the present invention
The spirit and scope of art scheme.
Claims (7)
1. the preparation method of a CNT laser-ultrasound enhancement layer, it is characterised in that include following step
Rapid:
Modified carbon nano-tube is mixed with anhydrous alcohol, it is thus achieved that the first mixed liquor；
Described first mixed liquor is mixed with polyxylene radical siloxane, it is thus achieved that the second mixed liquor；
Described second mixed liquor magnetic stirrer is stirred, with supersonic oscillations instrument ultrasonic disperse,
Stand, extract acquisition CNT laser-ultrasound enhancement layer material after bubble.
Preparation method the most according to claim 1, it is characterised in that: described modified carbon nano-tube with
The ratio of anhydrous alcohol is at 1:1-1:3.
Preparation method the most according to claim 1, it is characterised in that: described first mixed liquor and institute
The ratio stating polyxylene radical siloxane is 1:10-1:20.
Preparation method the most according to claim 1, it is characterised in that: described second mixed liquor is used
Magnetic stirrer stirs 10 minutes, and with supersonic oscillations instrument ultrasonic disperse 4-6 minute, to stand 4-5 little
Time, extraction bubble after obtain CNT laser-ultrasound enhancement layer material.
Preparation method the most according to claim 1, it is characterised in that: described extraction bubble step is:
After described second mixed liquor stands 1 hour, in placing it in vacuum drying oven, stand extraction described second
Institute's band bubble in mixed liquor.
Preparation method the most according to claim 1 or 5, it is characterised in that extract described second and mix
The time of institute's band bubble in liquid of closing is more than or equal to 2 hours.
Preparation method the most according to claim 1, it is characterised in that quiet at described second mixed liquor
After putting step, further comprise the steps of: between extraction bubble step
Again use supersonic oscillations instrument ultrasonic disperse 4-6 minute, stand 1 hour at described second mixed liquor
After, stand in placing it in vacuum drying oven and extract institute's band bubble in described second mixed liquor.
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| CN201610219421.2A CN105910989B (en) | 2016-04-11 | 2016-04-11 | A kind of preparation method of carbon nanotube laser-ultrasound reinforcement material |
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| CN201610219421.2A CN105910989B (en) | 2016-04-11 | 2016-04-11 | A kind of preparation method of carbon nanotube laser-ultrasound reinforcement material |
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| CN105910989A true CN105910989A (en) | 2016-08-31 |
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Cited By (3)
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| US20170010242A1 (en) * | 2015-07-09 | 2017-01-12 | The Boeing Company | Laser ultrasound system and method for inspection of a contoured structure |
| CN107854176A (en) * | 2017-12-17 | 2018-03-30 | 华中科技大学 | Optoacoustic thrombolysis device in a kind of microtrauma type body |
| CN108456444A (en) * | 2018-01-29 | 2018-08-28 | 华中科技大学 | A kind of optoacoustic conversion composite material and preparation method |
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| CN103792191A (en) * | 2012-10-30 | 2014-05-14 | 波音公司 | System and method for testing a composite structure by using a laser ultrasound testing system |
| US9164066B1 (en) * | 2012-06-19 | 2015-10-20 | The Boeing Company | Laser ultrasound array system |
| JP2016508395A (en) * | 2013-01-22 | 2016-03-22 | セノ メディカル インストルメンツ，インク． | Probe with photoacoustic isolator |
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| US9164066B1 (en) * | 2012-06-19 | 2015-10-20 | The Boeing Company | Laser ultrasound array system |
| CN103792191A (en) * | 2012-10-30 | 2014-05-14 | 波音公司 | System and method for testing a composite structure by using a laser ultrasound testing system |
| JP2016508395A (en) * | 2013-01-22 | 2016-03-22 | セノ メディカル インストルメンツ，インク． | Probe with photoacoustic isolator |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170010242A1 (en) * | 2015-07-09 | 2017-01-12 | The Boeing Company | Laser ultrasound system and method for inspection of a contoured structure |
| US10539538B2 (en) * | 2015-07-09 | 2020-01-21 | The Boeing Company | Laser ultrasound system and method for inspection of a contoured structure |
| CN107854176A (en) * | 2017-12-17 | 2018-03-30 | 华中科技大学 | Optoacoustic thrombolysis device in a kind of microtrauma type body |
| CN108456444A (en) * | 2018-01-29 | 2018-08-28 | 华中科技大学 | A kind of optoacoustic conversion composite material and preparation method |
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| CN105910989B (en) | 2019-03-08 |
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