CN109732196A - A kind of modified brass surfaces and the preparation method and application thereof - Google Patents
A kind of modified brass surfaces and the preparation method and application thereof Download PDFInfo
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- CN109732196A CN109732196A CN201811599632.9A CN201811599632A CN109732196A CN 109732196 A CN109732196 A CN 109732196A CN 201811599632 A CN201811599632 A CN 201811599632A CN 109732196 A CN109732196 A CN 109732196A
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Abstract
The present invention provides a kind of modified brass surfaces and the preparation method and application thereof to obtain the Brass sample after clean surface polishing after cleaning, drying this method comprises: brass surfaces to be processed are carried out polishing pretreatment by (1)；(2) laser scanning processing is carried out to Brass sample surface using pulse laser, processes multiple micro-nano structures in sample surfaces, be put into electric vacunm drying case and toast to get brass super hydrophobic surface is arrived；(3) ultra-hydrophilic surface that wedge-shaped or triangle connects side by side is handled out to get the surface alternate to super-hydrophobic-super hydrophilic wedge shape or triangle through laser processing in the super-hydrophobic condensing surface of resulting brass.This method is without chemical modification, simple process, it is easy to operate, it is at low cost, brass surfaces obtained are super-hydrophobic-super hydrophilic wedge-shaped or alternate triangle surface, are especially advantageous for the realization and lasting progress of dropwise condensation process, have excellent condensation performance, brass heat transfer rate is increased, the condensation efficiency of condenser pipe is improved.
Description
Technical field
The present invention relates to surface preparation technology fields more particularly to a kind of modified brass surfaces and preparation method thereof.
Background technique
Condenser pipe is a kind of equipment as condensation is facilitated, and is usually made of double-layer glass tube, it is handed over using heat
Changing principle makes a kind of cooling glass apparatus for being condensed into liquid of steam.Because diameter glass tube is limited, the gas or liquid of high temperature
It is limited to flow through inner tube contact area, so that heat exchange is insufficient, final condensation efficiency is not high, if increasing the size of heat-transfer equipment
Greatly, then it will increase dramatically condensation cost.Traditional condenser pipe is such as: the surface exhibits of glass, copper and stainless steel material go out hydrophily (this
Contact angle is levied less than 90 °), it is unfavorable for falling off for surface condensation drop.For lasting dropwise condensation process, condensing droplet is not
Soaking surface and capable of being rapidly separated surface in smaller scale is the key factor that process is realized.
Currently, the modification for metal material surface is more and more common, it is generally divided into chemical method and physical method.Brass tool
There are a good low-temperature flexibility and high low temperature intensity, while its heat resistance, intensity, plasticity, toughness, formability, solderability, anti-corrosion
Property is preferable, and density of material is small.Important application in the heat exchanger of power plant cooling tower, traditional cooling tower are to utilize
Water carries out cold and hot exchange and generates steam after contacting with air flowing, steam volatilization takes away heat and reaches evaporative heat loss, convective heat transfer
The waste heat that generates in industrial or refrigeration air-conditioner is dispersed with radiant heat transfer principle to reduce the evaporating radiator of water temperature, to protect
The normal operation of card device, device are generally tubbiness, and therefore named is cooling tower.After the water of traditional cooling tower is contacted with air flowing
It carries out cold and hot exchange and needs biggish heat-transfer equipment, the size and condensation module total amount of the equipment that must increase, and use at laser
Super-hydrophobic-super hydrophilic condensing surface of brass after reason can directly condense into drop, and be rapidly separated surface and take away big portion
The heat divided reduces energy consumption, reduces the volume of heat-transfer equipment, not only saved land area, but also just to play increase rate of heat exchange
In installation and later maintenance, and it can be reduced the cost of production equipment.However the method for modifying of existing brass surfaces, step are numerous
It is trivial, and manufactured surface condensation efficiency is not high.
For example, application No. is 201711054092.1 applications to disclose a kind of preparation of foam copper with super hydrophobic surface
Then method, the invention carry out low surface chemical modification with silicon fluoride, which has used room temperature easy by chemical oxidation treatment
Irritation of volatilizing and toxic chemical agent, do not have environmentally protective characteristic, also do not have selective laser relative to this patent
Texture weaves ability of the super hydrophobic surface without external force directed transport condensing droplet.Application No. is 201711204330.4 applications are open
It is a kind of in the without polishing method for quickly preparing bionic super-hydrophobic surface of copper-based surfaces, this method is first by copper sheet by preparatory
Processing carries out mechanical polishing and reaches mirror effect, then by the copper sheet pre-processed in optical fiber laser after polishing on sand paper
Lower progress texture etching；Again through brush plating；It is finally placed in the heating furnace of 393K and carries out Low Temperature Heat Treatment, obtain having three
The Brass sample of the super hydrophobic surface of grade hierarchical structure.This method processing is cumbersome, is not suitable for large-scale application, while this method is also
No selective laser texture establishment.
Summary of the invention
The purpose of the present invention is to overcome the defects in the prior art, provides a kind of modified brass surfaces and its preparation side
Method and application, for the preparation method without chemical modification, simple process is easy to operate, and high-efficient, less energy consumption is at low cost, Huang obtained
Copper surface is super-hydrophobic-super hydrophilic wedge-shaped or alternate triangle surface, is especially advantageous for the realization of dropwise condensation process and continues
It carries out, has excellent condensation performance, considerably increase brass heat transfer rate, improve the condensation efficiency of condenser pipe.
The present invention is implemented as follows:
One of the objects of the present invention is to provide a kind of preparation methods of modified brass surfaces, specifically include following step
It is rapid:
Brass surfaces to be processed are carried out polishing pretreatment by step 1, obtain clean surface polishing after cleaning, drying
Brass sample afterwards；
Step 2 carries out laser scanning processing to the resulting Brass sample surface of step 1 using pulse laser, in sample
Surface processes multiple micro-nano structures, places into electric vacunm drying case and toasts to get brass super hydrophobic surface is arrived；
Step 3, the super hydrophilic table of brass handled out in the super-hydrophobic condensing surface of the resulting brass of step 2 through laser processing
Face, the brass ultra-hydrophilic surface replace connection with brass super hydrophobic surface and form multiple subarrays, brass in the subarray
Ultra-hydrophilic surface and brass super hydrophobic surface are wedge shape or triangle, are equipped with super hydrophilic remittance between the two neighboring subarray
Ji Qu is to get the surface alternate to super-hydrophobic-super hydrophilic wedge shape or triangle.
Specifically, if the subarray is transversely arranged, the super hydrophilic remittance of nickel plate is equipped between the two neighboring subarray
Ji Qu be then it is vertically arranged, super hydrophilic pooling zone is nickel plate ultra-hydrophilic surface, and the shape of the super hydrophilic pooling zone of nickel plate can be with
It is arbitrary, can be rectangle, triangle, wedge shape etc..Wherein the wedge shape in subarray or the nickel plate of triangle are super hydrophilic
Surface along its area of the direction of water flow is gradually increased so that it is convenient to which water flow collects in super hydrophilic pooling zone.
Specifically, if the subarray longitudinal arrangement, the super hydrophilic remittance of nickel plate is equipped between the two neighboring subarray
Ji Qu is then laterally arranged, and super hydrophilic pooling zone is nickel plate ultra-hydrophilic surface, and the shape of the super hydrophilic pooling zone of nickel plate can be with
It is arbitrary, can be rectangle, triangle, wedge shape etc..Wherein the wedge shape in subarray or the nickel plate of triangle are super hydrophilic
Surface along its area of the direction of water flow is gradually increased so that it is convenient to which water flow collects in super hydrophilic pooling zone.
Preferably, the super hydrophobic surface has micro-nano binary surface texture, and roll angle is less than 10 °, described super-hydrophobic
The contact angle formed between surface and liquid disposed thereon is greater than 150 °；The ultra-hydrophilic surface and liquid disposed thereon it
Between the contact angle that is formed be 0 °.
Up to 160.4 °, minimum rolls the contact angle maximum formed between the super hydrophobic surface and liquid disposed thereon
Angle is 3 °, therefore has extraordinary ultra-hydrophobicity (liquid-solid interface contact angle is as super-hydrophobic greater than 150 °), and condensing
Super-hydrophobic-super hydrophilic characteristic is still kept in the process.
Preferably, the pretreatment of polishing described in the step 1 use power for 370W, lap speed be 450 turns/
Point, the pre-grinding test sample of gold phase machine that lap diameter is 230mm, and polish preprocessing process with diameter be 200mm, 1000 purposes
SiC waterproof abrasive paper is processed by shot blasting that polishing range is 100cm in the brass surfaces2, polishing time 10-20 minutes.
Preferably, it is cleaned in the step 1, dry specific steps are as follows: the Brass sample after polishing is placed on and is filled
It is cleaned in the ultrasonic washing instrument of ionized water, after cleaning up, the Brass sample surface is dried up with cold wind or room temperature is natural
It dries, the Brass sample after obtaining clean surface polishing.
It is further preferable that the supersonic frequency of the ultrasonic cleaning instrument is 40kHz, the deionized water resistivity is 18.25
Megaohm, the deionized water floods Brass sample surface, and continuous wash 20-60 minutes at room temperature.
Preferably, the step 2 and laser used in step 3 are ultrashort pulse laser, and wavelength is less than 1550nm,
Its repetition rate is 70kHz-1000kHz；Laser processing parameter used in the step 2 and step 3 are as follows: pulsewidth 10ns-
500ns, single pulse energy are less than 1.1mJ.
It is further preferable that laser used in the step 2 and step 3 is ultrashort pulse laser, wavelength is
1064nm, repetition rate 80kHz-200kHz；Laser processing parameter used in the step 2 and step 3 are as follows: pulsewidth is
100ns-240ns (optimal is 175ns-240ns), the single pulse energy is 0.2mJ-0.7mJ.
The laser scanning carries out light beam scanning using polygon prism device, and the speed of polygon prism scanning is 1m/s-800m/,
The on-off of laser and scanning range, scanning track and the process velocity of polygon prism device are controlled and are set by computer program；
Or the laser scanning is realized using exemplary motion stage device, and light beam is fixed, the movement of sample relative beam, platform fortune
Dynamic speed is 0.1mm/s-3m/s, and on-off, platform motion profile and the speed of laser are controlled and set by computer program；
Preferably, the laser scanning speed is 1000mm/s-2000mm/s.
Preferably, it in the step 2, is wrapped up, and is put into sealing sample sack with masking foil after preparation, place into electricity
It is toasted in thermal vacuum drying box, pressure is -0.101Mpa, humidity 0%RH, temperature 100 in the electric vacunm drying case
DEG C -250 DEG C, the time of the sample baking is 2-24 hour, and the temperature error in the electric vacunm drying case is ± 1 DEG C.
The second object of the present invention is the provision of a kind of modification brass surfaces that the method is prepared.
The third object of the present invention is the provision of the modification brass surfaces and is improving answering in condensation heat transfer efficiency
With.
The invention has the advantages that:
1, the preparation method of a kind of modified brass surfaces provided by the invention, no chemical modification, simple process, operation side
Just, high-efficient, less energy consumption is at low cost, and the technological parameter of the method for the present invention is easy to control, it is easy to accomplish industrial application.
2, a kind of modified brass surfaces provided by the invention are super-hydrophobic-super hydrophilic wedge-shaped or alternate triangle surface,
It is especially advantageous for the realization and lasting progress of dropwise condensation process；It is formed between the super hydrophobic surface and liquid disposed thereon
For contact angle maximum up to 160.4 °, minimum roll angle is 3 °, therefore has (the liquid-solid interface contact of extraordinary ultra-hydrophobicity
Angle is as super-hydrophobic greater than 150 °), and super-hydrophobic-super hydrophilic characteristic is still kept in condensation process.
3, a kind of modified brass surfaces provided by the invention are improving the application in condensation heat transfer efficiency, using present invention side
Super-hydrophobic-super hydrophilic brass wire surface that method is prepared is used for condenser pipe or other condensing metals, has excellent cold
Solidifying performance, considerably increases brass heat transfer rate, improves the condensation efficiency of condenser pipe.
Detailed description of the invention
Fig. 1 be the super hydrophobic surface part of modification brass surfaces that experimental example 1 of the present invention provides contact angle schematic diagram with
Roll angle schematic diagram；Wherein (a) is contact angle schematic diagram, (b) is roll angle schematic diagram；
Fig. 2 be the super hydrophobic surface part of modification brass surfaces that experimental example 2 of the present invention provides contact angle schematic diagram with
Roll angle schematic diagram；Wherein (c) is contact angle schematic diagram, (d) is roll angle schematic diagram；
Fig. 3 be the super hydrophobic surface part of modification brass surfaces that experimental example 3 of the present invention provides contact angle schematic diagram with
Roll angle schematic diagram；Wherein (e) is contact angle schematic diagram, (f) is roll angle schematic diagram；
Fig. 4 is super hydrophobic surface part contact angle schematic diagram and the rolling for the modification brass surfaces that experimental example 4 of the present invention provides
Dynamic angle schematic diagram；Wherein (g) is contact angle schematic diagram, (h) is roll angle schematic diagram；
Fig. 5 is the scanning electron microscope (SEM) photograph for the modification brass surfaces that the embodiment of the present invention 1 is prepared using pulse laser；
Fig. 6 is the structural schematic diagram for the modification brass surfaces that 1-4 of the embodiment of the present invention is provided；Wherein A is that brass is super hydrophilic
Surface, B are brass super hydrophobic surface.
Specific embodiment
Embodiment 1
The embodiment of the present invention provides a kind of modified brass surfaces and preparation method thereof, and described method includes following steps:
Step 1, by H62 brass polishing to be processed, selection power is 370W, and lap speed is 450 revs/min, grinding
Disk diameter is the pre-grinding test sample of gold phase machine of 230mm, and it is 200mm that polishing process, which needs to assist diameter, the SiC waterproof abrasive paper of 1200 mesh exists
The brass surfaces are processed by shot blasting that polishing range is 100cm2, polishing time 10 minutes, the brass after obtaining surface polishing
Sample；
Brass sample after the surface polishing is cleaned with ultrasonic washing instrument, ultrasonic washing instrument ultrasonic frequency is
40kHz floods sample surfaces with the deionized water that resistivity is 18.25 megaohms, at room temperature, continuous wash 30 minutes, and then
Washes of absolute alcohol is used again, after cleaning up, is taken out sample and is used and distill water submerged sample surfaces, continuous wash 15 minutes, room temperature
Naturally dry or cold wind drying, obtain clean Brass sample；
Step 2, using short-pulse laser, laser wavelength 1064nm, to the clean brass sample obtained described in step 1
Product surface carries out laser scanning manufacturing, and countless micro-structures is processed in sample surfaces；The laser pulsewidth is 240ns, single
Pulse energy is 0.48mJ, repetition rate 115kHz, and the laser scanning utilizes X-Y scanning galvanometer device, make laser beam with
Brass sample surface described in the ablation line by line of the scanning speed of 1420mm/s；The galvanometer device is by X-Y optical scanning head, electricity
Sub- driving amplifier, optical reflecting lens and field lens composition, the scanning range and speed of the galvanometer, line scans and Surface scan road
Diameter is controlled and is set by computer, and the signal that the computer provides passes through drive amplification circuit drives optical scanning head, from
And in the deflection of X-Y plane control laser beam, sample moves in the x-direction relative to laser beam, by control movement speed and
Laser pulse repetition frequency makes its pulse matching degree reach 1%-99%, after completing movement, then single step stepping in the y-direction, pass through
Step distance is controlled, its light beam registration is made to reach 1%-99%, workbench reversion in the direction y, the sample range of work is
10mm×10mm；
Sample after processing is put into electric vacunm drying case and toasts after the laser processing by sample,
Air pressure is normal atmospheric pressure, and humidity 0%RH, constant temperature toasts 24 hours under the conditions of temperature is 110 DEG C, obtains the brass
Super-hydrophobic rush condensing surface；
Step 3, the super hydrophilic table of brass handled out in the super-hydrophobic condensing surface of the resulting brass of step 2 through laser processing
Face, the brass ultra-hydrophilic surface replace connection with brass super hydrophobic surface and form multiple subarrays, brass in the subarray
Ultra-hydrophilic surface and brass super hydrophobic surface are wedge shape or triangle, are equipped with super hydrophilic remittance between the two neighboring subarray
Ji Qu is to get the surface alternate to super-hydrophobic-super hydrophilic wedge shape or triangle.
Embodiment 2
The preparation method of the modification brass surfaces of the present embodiment, except step 2 and laser pulsewidth described in step 3 are
200ns, single pulse energy 0.48mJ, repetition rate 115kHz；Remaining is the same as embodiment 1.
Embodiment 3
The preparation method of the modification brass surfaces of the present embodiment, except step 2 and laser pulsewidth described in step 3 are
100ns, single pulse energy 0.2mJ, repetition rate 200kHz；Remaining is the same as embodiment 1.
Embodiment 4
The preparation method of the modification brass surfaces of the present embodiment, except step 2 and laser pulsewidth described in step 3 are
240ns, single pulse energy 0.7mJ, repetition rate 80kHz, the laser scanning utilize polygon prism device, make laser beam with
Brass sample surface described in the ablation line by line of the speed of 1002mm/s；Remaining is the same as embodiment 1.
Comparative example 1
The comparative example is the brass surfaces being not handled by.
Comparative example 2
The comparative example is the brass surfaces of only brass super hydrophobic surface.
Experimental example
1, scanning electron microscope (SEM) photograph (SEM)
Modified brass surfaces obtained in embodiment 1 are scanned, scanning electron microscope (SEM) photograph (SEM) is as shown in Figure 5.It can be seen that
Nanoscale nutty structure is presented in its surface；The modification brass surfaces scanning electron microscope (SEM) photograph of embodiment 2- embodiment 4 can be presented
Nanoscale nutty structure, it is as a result similar, so not putting the figure of 4 part of embodiment 2- embodiment.
2, condensation test
The brass surfaces of the modification brass surfaces of embodiment 1- embodiment 4 and comparative example 1-2 are subjected to condensation test.
Condensation test carries out in closed laboratory with constant temperature and constant humidity, and temperature is about 22 ± 1 DEG C.Diameter is vertical for the condensing surface of 50mm
It is mounted in control room, boils water acutely to remove uncondensable gas.Pass through optical microscopy and high speed camera
The dynamic behaviour of (Photron FASTCAM SA4) observation condensation drop, measures sample condensate liquid in certain time by graduated cylinder
It drips quality and utilizes the temperature T inside thermocouple (TT-K-40) real time data acquisition condensation blocki.Wherein: room temperature is 25 DEG C,
Through calculating after condensing, the condensation coefficient of basis brass is 15.24W/ ㎡ K on the surface, measures contact angle, roll angle
Distilled water volume be 7 μ L.
Table 1 is the brass of modification brass surfaces and comparative example 1,2 that 1- of embodiment of the present invention embodiment 4 is prepared
The test comparison result of the contact angle on surface, roll angle and condensation efficiency.
Table 1
| Embodiment | Contact angle/° | Roll angle/° | Condensation efficiency/W/ ㎡ K |
| Embodiment 1 | 158.9 | 3.2 | 91.651 |
| Embodiment 2 | 157.3 | 9.6 | 89.182 |
| Embodiment 3 | 154.2 | 2.8 | 87.564 |
| Embodiment 4 | 160.7 | 8.6 | 94.263 |
| Comparative example 1 | 69.5 | Nothing | 39.642 |
| Comparative example 2 | 158.3 | 4.8 | 63.427 |
As shown in Table 1, the modification brass surfaces that embodiment 1- embodiment 4 is prepared be it is super-hydrophobic-super hydrophilic wedge shape or
The alternate surface of triangle is especially advantageous for the realization and lasting progress of dropwise condensation process；With extraordinary ultra-hydrophobicity,
And super-hydrophobic-super hydrophilic characteristic is still kept in condensation process, condensation efficiency is up to 94.263W/ ㎡ K.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of preparation method of modified brass surfaces, which is characterized in that specifically comprise the following steps:
Brass surfaces to be processed are carried out polishing pretreatment by step 1, after obtaining clean surface polishing after cleaning, drying
Brass sample；
Step 2 carries out laser scanning processing to the resulting Brass sample surface of step 1 using pulse laser, in sample surfaces
Multiple micro-nano structures are processed, places into electric vacunm drying case and toasts to get brass super hydrophobic surface is arrived；
Step 3, the brass ultra-hydrophilic surface handled out in the super-hydrophobic condensing surface of the resulting brass of step 2 through laser processing, institute
State brass ultra-hydrophilic surface replace with brass super hydrophobic surface connection form multiple subarrays, brass is super hydrophilic in the subarray
Surface and brass super hydrophobic surface are wedge shape or triangle, are equipped with super hydrophilic pooling zone between the two neighboring subarray,
Obtain super-hydrophobic-super hydrophilic wedge-shaped or alternate triangle surface.
2. the preparation method of modified brass surfaces as described in claim 1, which is characterized in that the super hydrophobic surface has micro-nano
Meter Er Yuan surface texture, and roll angle is less than 10 °, the contact angle formed between the super hydrophobic surface and liquid disposed thereon
Greater than 150 °；The contact angle formed between the ultra-hydrophilic surface and liquid disposed thereon is 0 °.
3. the preparation method of modified brass surfaces as described in claim 1, which is characterized in that throwing described in the step 1
It for 370W, lap speed is 450 revs/min that light pretreatment, which uses power, the pre-grinding test sample of gold phase that lap diameter is 230mm
Machine, and polish that preprocessing process with diameter is 200mm, the SiC waterproof abrasive paper of 1000 mesh is processed by shot blasting in the brass surfaces,
Polishing range is 100cm2, polishing time 10-20 minutes.
4. the preparation method of modified brass surfaces as described in claim 1, which is characterized in that cleaned in the step 1, is dry
Specific steps are as follows: the Brass sample after polishing is placed in the ultrasonic washing instrument for fill deionized water and is cleaned, is cleaned up
Afterwards, the Brass sample by the Brass sample surface cold wind drying or room temperature naturally dry, after obtaining clean surface polishing.
5. the preparation method of modified brass surfaces as claimed in claim 4, which is characterized in that the ultrasound of the ultrasonic cleaning instrument
Frequency is 40kHz, and the deionized water resistivity is 18.25 megaohms, and the deionized water floods Brass sample surface, in room
Temperature is continuous wash 20-60 minutes lower.
6. the preparation method of modified brass surfaces as described in claim 1, which is characterized in that institute in the step 2 and step 3
Laser is ultrashort pulse laser, and wavelength is less than 1550nm, repetition rate 70kHz-1000kHz；The step 2
With laser processing parameter used in step 3 are as follows: pulsewidth 10ns-500ns, single pulse energy are less than 1.1mJ.
7. the preparation method of modified brass surfaces as described in claim 1, which is characterized in that institute in the step 2 and step 3
Laser is ultrashort pulse laser, wavelength 1064nm, repetition rate 80kHz-200kHz；The step 2 with
Laser processing parameter used in step 3 are as follows: pulsewidth 100ns-240ns, the single pulse energy are 0.2mJ-0.7mJ.
8. the preparation method of modified brass surfaces as described in claim 1, which is characterized in that in the step 2, preparation is finished
It is wrapped up, and is put into sealing sample sack with masking foil afterwards, place into baking, the electric vacunm drying in electric vacunm drying case
Pressure is -0.101Mpa in case, and humidity 0%RH, temperature is 100 DEG C -250 DEG C, and the time of the sample baking is that 2-24 is small
When, the temperature error in the electric vacunm drying case is ± 1 DEG C.
9. a kind of such as the preparation-obtained modified brass surfaces of any the method for claim 1-8.
10. modified brass surfaces as claimed in claim 9 are improving the application in condensation heat transfer efficiency.
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| CN201811599632.9A CN109732196A (en) | 2018-12-26 | 2018-12-26 | A kind of modified brass surfaces and the preparation method and application thereof |
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| CN201811599632.9A CN109732196A (en) | 2018-12-26 | 2018-12-26 | A kind of modified brass surfaces and the preparation method and application thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110842360A (en) * | 2019-11-28 | 2020-02-28 | 长春理工大学 | Method for improving boiling heat exchange performance of surface pool based on femtosecond laser splicing processing technology |
| CN111975202A (en) * | 2020-07-23 | 2020-11-24 | 江苏大学 | Laser welding method for dissimilar metal materials |
-
2018
- 2018-12-26 CN CN201811599632.9A patent/CN109732196A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110842360A (en) * | 2019-11-28 | 2020-02-28 | 长春理工大学 | Method for improving boiling heat exchange performance of surface pool based on femtosecond laser splicing processing technology |
| CN110842360B (en) * | 2019-11-28 | 2021-10-12 | 长春理工大学 | Method for improving boiling heat exchange performance of surface pool based on femtosecond laser splicing processing technology |
| CN111975202A (en) * | 2020-07-23 | 2020-11-24 | 江苏大学 | Laser welding method for dissimilar metal materials |
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