CN107574435A - Powder-feeding laser prepares corrosion resistant alloy coating process - Google Patents
Powder-feeding laser prepares corrosion resistant alloy coating process Download PDFInfo
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- CN107574435A CN107574435A CN201710438761.9A CN201710438761A CN107574435A CN 107574435 A CN107574435 A CN 107574435A CN 201710438761 A CN201710438761 A CN 201710438761A CN 107574435 A CN107574435 A CN 107574435A
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Abstract
The present invention relates to a kind of powder-feeding laser to prepare corrosion resistant alloy coating process, 600 1200 nanometers of optical maser wavelength, 40 100 watts of power, 200 400 microns of spot diameter, the 15mm/s of sweep speed 5；Coating is nickel-base alloy with dusty material, and containing 2 6%W, 1 3%Al and 0.1 3%Sn, powder size is at 30 120 microns, the 25g/s of powder feed rate 10；Using coaxial inert gas shielding, the 40L/min of gas flow 20；d）Using matrix form scan method, anti-corrosion coating thickness is controllable in the range of 0.5 2.0mm.
Description
Technical field
The present invention relates to laser prepares coating method, belong to rapid prototyping ＆ manufacturing technology field, more particularly to a kind of profit
The method that abros coating is prepared with powder-feeding laser.
Background technology
Auto-feeding laser cladding alloying technology is mainly used in the repairing of machine components, prepared by wear-resistant coating, corrosion resistant alloy applies
Layer is prepared etc., is compared to the technological means such as traditional electric arc, possesses efficiency high and the high advantage of quality.With laser price
Decline, dusty material species increase, in last decade, the technology is widely applied.
The widely used laser of industry is mainly CO at present2And optical fiber laser, but due to the limitation of wavelength and power,
It is difficult to accomplish the accurate control to coating layer thickness and surface roughness.The wavelength of the laser of existing market is in 1500-3500
Nanometer, it is relatively low to the absorbed power of dusty material, and spot diameter is larger, is unfavorable for controlling the size of coating.
Anti-corrosion coating is prepared in Thin Specs piece surface, it is necessary to accomplish the accurate control to coating layer thickness and surface roughness
Just can be with.Prior art can not also accomplish anti-corrosion in thickness specification 0.5-2.0mm metal parts surface progress thickness 0.5-2.0mm
The preparation of alloy coat, and also need to ensure surface quality.
The content of the invention
It is an object of the invention to provide the method that powder-feeding laser prepares corrosion resistant alloy coating, solving prior art can not
What is overcome can not prepare the problem of Thin Specs coating in Thin Specs piece surface, can be completed on 0.5-2.0mm metal parts surface
Prepared by thickness 0.5-2.0mm corrosion resistant alloys coating, and surface roughness is less than 0.5 micron.
For achieving the above object, the present invention adopts the following technical scheme that：
Powder-feeding laser prepares corrosion resistant alloy coating process, it is characterised in that：A) optical maser wavelength 600-1200 nanometers, power
40-100 watts, spot diameter 200-400 microns, sweep speed 5-15mm/s；B) coating is nickel-base alloy with dusty material, is contained
2-6%W, 1-3%Al and 0.1-3%Sn, powder size is in 30-120 microns, powder feed rate 10-25g/s；C) using coaxial lazy
Property gas shield, gas flow 20-40L/min；D) matrix form scan method is used, along coating widths direction advance 0.3-
0.7mm, then along coated length direction advance 250-500 microns, move in circles, until completing；
Powder-feeding laser prepares corrosion resistant alloy coating process, and dusty material can also use mixed metal powder；
Powder-feeding laser prepares corrosion resistant alloy coating process, and anti-corrosion coating thickness is controllable in the range of 0.5-2.0mm.
Technology is described as follows：
Optical maser wavelength 600-1200 nanometers, 40-100 watts of power, spot diameter 200-400 microns, sweep speed 5-15mm/
s。
Dusty material increases with the reduction of laser beam wavelength the absorptivity of laser beam, therefore reduces laser beam wavelength
Being advantageous to increases laser beam energy is absorbed by dusty material, improves efficiency of energy utilization.Laser beam wavelength is reduced to be also beneficial to drop
Low spot size of laser beams, so as to be advantageous to the accurate control of coating size.
When laser beam wavelength is less than 600 nanometers, although dusty material absorption coefficient is high, cost can be increased, reduced
Processing efficiency；When wavelength is more than 1200 nanometers, while absorption of the dusty material to energy is reduced, it is straight to also increase hot spot
Footpath, energy density is reduced, be unfavorable for coating layer thickness control.Therefore the preferred 600-1200 nanometers of laser beam wavelength.
When laser beam wavelength 700-1100 nanometers, effect is more preferable；
When laser beam wavelength 750-1000 nanometers, effect is best；
40-100 watts of laser beam power.
When light rate is less than 40 watt-hours, it is impossible to provide enough heats to melt powder；When power is more than 100 watts, no
Pool depth is easily controlled, easily forms dell, is unfavorable for processability.It is therefore preferable that power is 40-100 watts.
Spot diameter 200-400 microns.
When spot diameter is less than 200 microns, it is too low to melt efficiency；When spot diameter is more than 400 microns, light spot energy
The powder fusing that density is relatively low, is irradiated to is incomplete, is unfavorable for processability and quality control on the surface.It is therefore preferable that power is
200-400 microns.
Sweep speed 5-15mm/s.
When sweep speed is less than 5mm/s, efficiency is too low；When sweep speed is more than 15mm/s, led due to absorbing shortage of heat
Cause powder fusing incomplete, be unfavorable for Forming Quality.It is therefore preferable that speed is 5-15mm/s.
Coating is nickel-base alloy with dusty material, and containing 2-6%W, 1-3%Al and 0.1-3%Sn, powder size is in 30-
120 microns, powder feed rate 10-25g/s.
W is typically frequently utilized in the materials such as cutter, heat resisting steel due to possessing good heat resistance.But in this hair
In bright, W one side and the compound addition of Al, Sn, corrosion resisting property can be effectively improved；On the other hand, due to suctions of the W for laser heat
Efficiency high is received, therefore the processability of dusty material can be improved.When its content is less than 2%, DeGrain；When it contains
When amount is more than 6%, cost can be dramatically increased, and corrosion resisting property raising is limited, it is therefore preferable that content is 2-6%.
Al possesses corrosion resisting property, but low to the absorption efficiency of light.In the present invention, Al and W, Sn compound addition are carried out,
It is remarkably improved corrosion resisting property.When its content is less than 1%, corrosion resisting property DeGrain is improved；When its content is more than 3%
When, substantial amounts of intermetallic Ni-Al compound can be formed, such compound is hard and crisp, while coating toughness is reduced, also easily
Crackle is caused to produce.It is therefore preferable that content is 1-3%.
Sn disposes usually as objectionable impurities elements, needs.But in the present invention, add a certain amount of sides of Sn mono-
Face can improve corrosion resisting property, on the other hand can significantly reduce the generation of metallic compound between nickel aluminium, so as to avoid fragility and
The generation of crackle.When its content is less than 0.1%, anti-corrosion DeGrain is improved；When its content is more than 3%, crystalline substance can be triggered
Crackle between boundary, reduce the overall plasticity and toughness of coating.It is therefore preferable that content is 0.1-3%.
When its content is 0.2-2.5%, effect is more preferable；
As speed of travel 0.3-2.0%, effect is best；
Powder size is in 30-120 microns, powder feed rate 10-25g/s.
On the one hand powder size determines mobility, on the other hand also influence the compactness and quality of coating.When size is low
When 30 microns, it is unfavorable for mobility, is unfavorable for deposition efficiency raising；When powder size is more than 120 microns, deposition can be reduced
The compactness of coating, causes the porosity to increase.It is therefore preferable that size range is 30-120 microns.
Powder feed rate needs to ensure coating quality with laser beam power, spot size matching.When powder feed rate is less than
During 10g/s, efficiency is too low；When powder feed rate is more than 25g/s, it is bad to cause to melt effect, influences coating surface quality.Cause
This, preferably powder feed rate is 10-25g/s.
Using coaxial inert gas shielding, gas flow 20-40L/min；
Coaxial inert gas shielding is also beneficial to promote the stable supplying of powder while molten bath is protected, and can carry
Height gives speed and feed amount, so as to improve deposition efficiency.When gas flow is less than 20L/min, protection is inadequate；Work as gas stream
When amount is more than 40L/min, the steady flow condition of powder can be destroyed, so as to cause the processability of coating and surface quality to be disliked
Change.It is therefore preferable that gas flow is 20-40L/min.
Using matrix form scan method, along coating widths direction advance 0.3-0.7mm, then advance along coated length direction
250-500 microns.The matrix form scan method has taken into account effective absorption of laser beam energy simultaneously, has also taken into account deposition efficiency.
Along coating widths direction
Powder can also use nickel-base alloy, W, Al and Sn powder to mix.
Corrosion resistant alloy coating layer thickness is controllable in the range of 0.5-2.0mm, and coating layer thickness can pass through powder sending quantity, laser beam work(
Rate, spot diameter and sweep speed regulation.
Advantages of the present invention and beneficial effect：
1. present approach provides corrosion resistant alloy coating and powder-feeding laser preparation method, thickness 0.5-2mm paintings are realized
The accurate control of layer, and shaping and excellent surface quality；
2. present approach provides a kind of ni base alloy coating of excellent corrosion resistance, compound by W, Al and Sn adds
Add, significantly improve the corrosion resisting property of coating.
Embodiment
Technical scheme is further described below in conjunction with preferred embodiment.
Steel plate selects carbon steel Q345D, thickness 6mm, length 400mm, width 80mm.
The nickel-base alloy of target component is prepared using vacuum metling equipment, powder is then made；Also prepare nickel respectively simultaneously,
Al, W and Sn powder, powder sort and composition are shown in Table 1.
Carry out auto-feeding laser cladding experiment, prepare corrosion resistant alloy coating, machined parameters are shown in Table 1.
Deposited metal test finishes, examines coating quality and corrosion resisting property, the results are shown in Table 2.
Embodiment 1-8：
Embodiment 1-4 uses alloy powder, and embodiment 5-8 uses mixed-powder.
Coating quality and corrosion resisting property are shown in Table 2.
Comparative example 1-4：
Comparative example 1-2 uses alloy powder, and comparative example 3-4 uses mixed-powder.
Coating quality and corrosion resisting property are shown in Table 2.
By above-described embodiment, powder-feeding laser provided by the invention prepares corrosion resistant alloy coating, one side corrosion resistance
Can be excellent, another aspect thickness is controllable and Forming Quality and excellent surface quality.
Embodiment described above only expresses the embodiment of the present invention, but can not be therefore understands that for the present invention
The limitation of the scope of the claims.Any variation that those skilled in the art is done under the enlightenment of present inventive concept to the present invention falls
Within the scope of the present invention.
The embodiment coating preparation parameter of table 1
The embodiment prepares coating quality of table 2 and performance
Claims (3)
1. powder-feeding laser prepares corrosion resistant alloy coating process, it is characterised in that：a）Optical maser wavelength 600-1200 nanometers, power 40-
100 watts, spot diameter 200-400 microns, sweep speed 5-15mm/s；b）Coating is nickel-base alloy with dusty material, contains 2-
6%W, 1-3%Al and 0.1-3%Sn, powder size is in 30-120 microns, powder feed rate 10-25g/s；c）Using coaxial inert gas
Protection, gas flow 20-40L/min；d）Using matrix form scan method, along coating widths direction advance 0.3-0.7mm, then
Along coated length direction advance 250-500 microns, move in circles, until completing.
2. powder-feeding laser according to claim 1 prepares corrosion resistant alloy coating process, it is characterised in that：Dusty material also may be used
Using mixed metal powder.
3. the powder-feeding laser according to claim 1-2 prepares corrosion resistant alloy coating process, it is characterised in that：Corrosion resistant alloy applies
Thickness degree is controllable in the range of 0.5-2.0mm.
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| CN201710438761.9A CN107574435A (en) | 2017-06-12 | 2017-06-12 | Powder-feeding laser prepares corrosion resistant alloy coating process |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4532191A (en) * | 1982-09-22 | 1985-07-30 | Exxon Research And Engineering Co. | MCrAlY cladding layers and method for making same |
| EP1444388A1 (en) * | 2001-09-22 | 2004-08-11 | ALSTOM Technology Ltd | Mcraly-coating |
| CN1542166A (en) * | 2003-11-07 | 2004-11-03 | 上海工程技术大学 | Method for crack resistant treatment of laser cladded nano-ceramic coating |
| CN101643901A (en) * | 2008-08-06 | 2010-02-10 | 沈阳新松机器人自动化股份有限公司 | Alloy coating for crystallizer surface laser cladding and preparation method thereof |
| CN105887082A (en) * | 2016-06-27 | 2016-08-24 | 芜湖三刀材料科技有限公司 | Nickel-based laser cladding coating and preparation method |
| US20160340762A1 (en) * | 2015-05-20 | 2016-11-24 | Caterpillar Inc. | Cladding Composition and Method for Remanufacturing Components |
-
2017
- 2017-06-12 CN CN201710438761.9A patent/CN107574435A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4532191A (en) * | 1982-09-22 | 1985-07-30 | Exxon Research And Engineering Co. | MCrAlY cladding layers and method for making same |
| EP1444388A1 (en) * | 2001-09-22 | 2004-08-11 | ALSTOM Technology Ltd | Mcraly-coating |
| CN1542166A (en) * | 2003-11-07 | 2004-11-03 | 上海工程技术大学 | Method for crack resistant treatment of laser cladded nano-ceramic coating |
| CN101643901A (en) * | 2008-08-06 | 2010-02-10 | 沈阳新松机器人自动化股份有限公司 | Alloy coating for crystallizer surface laser cladding and preparation method thereof |
| US20160340762A1 (en) * | 2015-05-20 | 2016-11-24 | Caterpillar Inc. | Cladding Composition and Method for Remanufacturing Components |
| CN105887082A (en) * | 2016-06-27 | 2016-08-24 | 芜湖三刀材料科技有限公司 | Nickel-based laser cladding coating and preparation method |
Non-Patent Citations (1)
| Title |
|---|
| 李嘉宁: "《激光熔覆技术及应用》", 31 January 2016, 化学工业出版社 * |
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