CN102424943A - Preparation method for inconel alloy based self-lubricating corrosion and wear resistant coating - Google Patents
Preparation method for inconel alloy based self-lubricating corrosion and wear resistant coating Download PDFInfo
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- CN102424943A CN102424943A CN2011104369435A CN201110436943A CN102424943A CN 102424943 A CN102424943 A CN 102424943A CN 2011104369435 A CN2011104369435 A CN 2011104369435A CN 201110436943 A CN201110436943 A CN 201110436943A CN 102424943 A CN102424943 A CN 102424943A
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Abstract
The invention discloses a preparation method for an inconel alloy based self-lubricating corrosion and wear resistant coating. The method comprises the steps of: spraying Ni-based diamond alloy powder on a matrix so as to obtain a primary coating; scanning the primary coating with a laser beam so as to obtain a final coating. In the invention, through laser scanning treatment, a dense antifriction lubricating oxide film is formed on the coating surface of an inconel alloy workpiece, and the coating is dense and is closely combined with the matrix interface. The method of the invention meets the service demand of the coating in a high wearing and corrosive medium, and the laser scanning treatment also greatly improves its surface hardness. The method of the invention broadens the engineering application scope of thermal spraying coatings, and provides a new method for developing cogeneric high-end products.
Description
Technical field
What the present invention relates to is a kind of coating production of workpiece surface, in particular a kind of preparation method of pyrolic alloy base self-lubricating anti-corrosion wear coating.
Background technology
Nickel chromium triangle (Inconel) alloy is a kind of precipitation hardenable alloy, and it has very high creep-rupture strength under the hot conditions more than 700 ℃, be applied to internal combustion turbine, thrust chamber, spacecraft, pump and instrument.The high firmness that in the HVAF process, has under stable thermal property (like thermal distortion) and the medium temperature condition owing to this alloy is selected as base material.
The thermospray protective coating is widely used in the facility of petroleum chemical plant, coil paper processing, wrapping machine assembly, pump component (impeller, sealing-ring, valve body, sliding surface bearing), hydraulicefficiency machinery (piston, bar), seashore and offshore place etc. in industry.All require coating to have the not performance of being corroded property dielectric corrosion of protection base material in many industrial application.Must not have and the contacted hole of corrosive medium on the base material, to prevent base material generation galvanic corrosion.Coated material (Ni base, the basic alloy of Co and sintering metal) has than the better chemical property of common iron, thereby is more suitable for work under rugged environment.
Research to HVAF HVOF (High Velocity Oxygen Fuel) metal alloy coating shows; Although they do not have metal ceramic wear-resisting; But because their high deposition rate, very low processing (grinding/polishing) cost and lower powder cost, the HVAF metal alloy coating has important use in industry.They possibly also have some special performances, like high firmness under the high temperature and strong anti-oxidation property.Up to now, other HVAF alloy of experimental study is seldom arranged, like wear resistance alloy Triballoys alloy or Ni-Cr-Mo-W-B alloy.The composition of Triballoys alloy is M-Mo-Cr-Si (M is Co or Ni), has high wear resistance, erosion resistance and oxidation-resistance, should not adopt bulk form because this type alloy is frangible, so main as coating.However, people have mainly studied this type alloy under as-welded and the metal cladding state, rather than go to study them with the form of thermospray.The inner hole of coating after the thermal spraying treatment is bigger, organizes evenly inadequately, and wear resistance and erosion resistance are all poor.Restricted the range of application of HVAF metal alloy coating through engineering approaches.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, a kind of preparation method of pyrolic alloy base self-lubricating anti-corrosion wear coating is provided, form densification, rub resistance, compact coating at matrix surface.
The present invention realizes through following technical scheme, the present invention includes following steps: (1) is used HVAF that Ni base class diamond powdered alloy is sprayed on and is made primary coat on the matrix;
(2) use laser beam flying to make final coating to primary coat.
In the said Ni base class diamond powdered alloy, by mass percentage, Ni 40～60%, and Cr 15～30%, W 9～15%, Mo 8～12%, Cu 4～10% and Al 1～5%.
The granularity of said Ni base class diamond powdered alloy is 15～45 μ m.
In the said step (1), before HVAF, matrix is used Al more earlier with after the acetone
2O
3Carry out sandblasting.
Said Al
2O
3Granularity be 50～80 orders, the Al of appropriate size
2O
3Can improve the bonding force of matrix.
In the said step (1), during HVAF, main combustion gases O
2Flow be 20～50SCCM, auxilliary combustion gases H
2Flow be 40～70SCCM; Main combustion gases and auxilliary combustion gases the combustion chamber be ejected into matrix surface after Ni base class diamond powdered alloy mixes; Jet length is 5～10inch, and powder feeding rate is 30～50g/min, and combustion chamber pressure is 5～10bar; Sedimentation rate is 3～7 μ m/min, and spraying back primary coat thickness is 250～350 μ m.
Laser beam flying use power is the CO of 4～10kW, spot diameter 4～5mm, sweep velocity 300～600mm/min in the said step (2)
2Continuous-wave laser beam.
During said laser beam flying, the overlapping rate of adjacent twice laser beam is 10%～30%, can guarantee that whole coatingsurface can both be arrived by laser scanning.
The present invention compares prior art and has the following advantages: the present invention handles through laser scanning, has realized that the coatingsurface of pyrolic alloy workpiece forms the lubricated sull of fine and close anti-attrition, and coating densification and coating and basal body interface combine closely; Realized the demand that coating is on active service in height wearing and tearing and corrosive medium environment, laser scanning is handled also has sizable raising to its surface hardness; Enlarged hot spray coating through engineering approaches range of application, for the exploitation of similar high-end product provides new method.
Description of drawings
Fig. 1 is the laser scanning process principle figure;
Fig. 2 is the cross-sectional view at primary coat and basal body interface place;
Fig. 3 is the cross-sectional view at final coating and basal body interface place;
Fig. 4 is a coating The friction coefficient cycle index variation diagram;
Fig. 5 is primary coat surface abrasion vestige figure;
Fig. 6 is final coatingsurface wear print figure;
Fig. 7 is a primary coat and final coating corrosion potential variation diagram in time in 3.5wt%NaCl solution respectively;
Fig. 8 is a primary coat and final coating polarization curve in 3.5wt%NaCl solution respectively;
Fig. 9 is primary coat galvanic corrosion aspect graph in 3.5wt%NaCl solution;
Figure 10 is final coating galvanic corrosion aspect graph in 3.5wt%NaCl solution;
Figure 11 is the X-ray diffraction analysis figure after primary coat and the galvanic corrosion of final coating difference.
Embodiment
Elaborate in the face of embodiments of the invention down, present embodiment provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment being to implement under the prerequisite with technical scheme of the present invention.
The preparation method of the pyrolic alloy base self-lubricating anti-corrosion wear coating of present embodiment may further comprise the steps: (1) is used HVAF that Ni base class diamond powdered alloy is sprayed on and is made primary coat on the matrix;
In the Ni base class diamond powdered alloy, by mass percentage, Ni 50%, and Cr 20%, W 11%, Mo 11%, Cu 5% and Al 3%, and the granularity of Ni base class diamond powdered alloy is 30 μ m.
Before HVAF, after 5 minutes, using granularity again is 50 purpose Al with acetone in matrix elder generation
2O
3Carry out sandblasting;
Select JK3000 type HVAF in the present embodiment for use, main combustion gases O
2Flow be 34SCCM, SCCM is the SCM of PM, auxilliary combustion gases H
2Flow be 57SCCM; Main combustion gases and auxilliary combustion gases the combustion chamber be ejected into matrix surface after Ni base class diamond powdered alloy mixes; Jet length is 7inch, and powder feeding rate is 35g/min, and combustion chamber pressure is 6.8bar; Sedimentation rate is 5 μ m/min, and spraying back primary coat thickness is 300 μ m.
(2) use laser beam flying to make final coating to primary coat:
As shown in Figure 2, concrete steps are following: it is the TJ-HL-T 5000 type CO of 5kW that present embodiment is selected power for use
2The continuous wave laser irradiation apparatus; This laser equipment is the laser beam of the similar Gaussian distribution of energy distribution propagated on the focal plane of 200 mm in focal length length; Laser beam wavelength is 10.6 μ m; Laser beam in atmospheric environment above matrix the height of 18.5mm be radiated matrix surface; Real work power is that the laser beam that 800W, oval hot spot are of a size of 5mm * 4mm moves along the direction of short diameter (B=4mm) with scan velocity V=500mm/min, and the overlapping rate of the twice laser beam that links to each other is 20%, promptly like d=0.8mm among Fig. 2.
The thing of the final coating that obtains after the laser scanning mainly is γ-Ni sosoloid and Cr mutually
23C
6Primary phase also has a fraction of Cr
3C
2, WC and Ni
4Mo.Laser scanning makes final coating and matrix separation surface combine closely so that be difficult to viscous deformation takes place, and coatingsurface hardness is significantly improved.Laser scanning helps coatingsurface to form fine and close rub resistance sull, improves Cr in γ-Ni sosoloid
23C
6, Cr
3C
2, WC and Ni
4Bonding force between each phase of Mo is greatly improved the coating abrasion performance.
With the final coating performance contrast after primary coat behind the present embodiment HVAF (HVOF) and the laser beam flying (LI) as follows.
As shown in table 1:
The surface property of table 1 primary coat and final coating and wearing and tearing counting rate meter
| Coating | Roughness (μ m) | Porosity (%) | Hardness (HV 0.5) | Wear rate (10 -3mm 3/N·min) |
| Primary coat | 2.50
 |
3.8
 |
802.6
 |
0.7889 |
| Final coating | 2.56 0.56 | 0.8
 |
968.6
 |
0.3268 |
Can be learnt that by last table handle through laser scanning, the final coatingsurface roughness levels after the laser beam flying is improved, surface hardness is from HV
0.5=802.6 to HV
0.5=968.6 significantly improve approximately 20.7%, and porosity is from 3.8
0.3% to 0.8
0.2% obviously reduces, and the coating abrasion performance is greatly improved.
As shown in Figures 2 and 3, without crossing the primary coat that laser scanning is handled, one 1～3 wide porous belt of μ m is arranged in primary coat and matrix separation surface place; Laser scanning is handled and is made that final coating combines with the interface of matrix closely to help improving coating and high base strength.Laser scanning is handled can produce stress at coatingsurface, coating generation partial remelting, thus make coating become fine and close.Can find out that from coating and matrix separation surface form laser scanning is handled the interface of combining closely that obtains and limited corrosive medium infiltration matrix to a certain extent, improve the erosion resistance of coating.
Cycle index as shown in Figure 4, identical, laser scanning are handled and are made coating inside form the large-area oxide compound Cu that helps to reduce the sliding surface roughness
XO and Cr
2O
3, reduced frictional coefficient.
Like Fig. 5 and shown in Figure 6; The polishing scratch that the primary coat surface abrasion of handling without the mistake laser scanning produces is wide to be 550～600 μ m; After laser scanning is handled; The polishing scratch that the surface abrasion of final coating produces is wide to be 200～250 μ m, and the wear resistance of this explanation laser scanning irradiation back coating obviously increases.
As shown in Figure 7, the surface passivated membrane that the measurement curve of the electromotive force of open circuit potential moves the explanation primary coat round about is the alloy below the supercoat fully, and matrix corrodes.Final coating after laser scanning is handled obtains fine and close more structure, therefore, after laser scanning is handled, can stop electrolytic solution to get into matrix by coating better.
As shown in Figure 8, final coating passive state corrosion current diminishes and is more stable after laser scanning is handled, and explains that the laser scanning processing makes the coatingsurface passive film have more protectiveness.
Like Fig. 9 and shown in Figure 10, the last circle of figure is a corrosion pit, is very serious without the corrosion of crossing the primary coat that laser scanning handles, and occurs a large amount of deep corrosions and cheats, and a large amount of corrosion products have been stayed coatingsurface, and are as shown in Figure 9; The final coatingsurface corrosion pit of handling through laser scanning diminishes, shoals, and corrosion product also only is present in the regional area of coating, and is shown in figure 10.
Shown in figure 11, the nickel oxide relative content is than much little without nickel oxide relative content in the primary coat of crossing the laser scanning processing in the final coating that the process laser scanning is handled.
In the present embodiment, in the Ni base class diamond powdered alloy, by mass percentage, Ni 40%, and Cr 30%, W 15%, Mo 8%, Cu 4% and Al 3%, and the granularity of powder is 45 μ m.
Select JK3000 type HVAF in the present embodiment for use, main combustion gases O
2Flow be 20SCCM, auxilliary combustion gases H
2Flow be 70SCCM; Main combustion gases and auxilliary combustion gases the combustion chamber be ejected into matrix surface after Ni base class diamond powdered alloy mixes; Jet length is 10inch, and powder feeding rate is 50g/min, and combustion chamber pressure is 5bar; Sedimentation rate is 3 μ m/min, and spraying back primary coat thickness is 250 μ m.
The CO of power as 4kW, circular light spot diameter 4mm, sweep velocity 300mm/min used in laser beam flying
2Continuous-wave laser beam.The overlapping rate of adjacent twice laser beam is 10%.
Other embodiments are identical with embodiment 1, and the contrast of primary coat and final coating is referring to embodiment 1.
Embodiment 3
In the present embodiment, in the Ni base class diamond powdered alloy, Ni 55% by mass percentage, and Cr 15%, W 10%, Mo 9%, Cu 9% and Al 2%, and the granularity of powder is 15 μ m.
Select JK3000 type HVAF in the present embodiment for use, main combustion gases O
2Flow be 50SCCM, auxilliary combustion gases H
2Flow be 40SCCM; Main combustion gases and auxilliary combustion gases the combustion chamber be ejected into matrix surface after Ni base class diamond powdered alloy mixes; Jet length is 5inch, and powder feeding rate is 30g/min, and combustion chamber pressure is 10bar; Sedimentation rate is 7 μ m/min, and spraying back primary coat thickness is 350 μ m.
The laser beam that laser beam flying uses power to be of a size of 5mm * 4mm as 4kW, oval hot spot moves along the direction of long diameter (5mm) with scan velocity V=600mm/min, and the overlapping rate of the twice laser beam that links to each other is 30%.
Other embodiments are identical with embodiment 1, and the contrast of primary coat and final coating is referring to embodiment 1.
In the present embodiment, in the Ni base class diamond powdered alloy, Ni 60% by mass percentage, and Cr 15%, W 9%, Mo 8%, Cu 7% and Al 1%, and the granularity of powder is 15 μ m.
Select JK3000 type HVAF in the present embodiment for use, main combustion gases O
2Flow be 50SCCM, auxilliary combustion gases H
2Flow be 40SCCM; Main combustion gases and auxilliary combustion gases the combustion chamber be ejected into matrix surface after Ni base class diamond powdered alloy mixes; Jet length is 5inch, and powder feeding rate is 30g/min, and combustion chamber pressure is 10bar; Sedimentation rate is 7 μ m/min, and spraying back primary coat thickness is 350 μ m.
The laser beam that laser beam flying uses power to be of a size of 5mm * 4mm as 10kW, oval hot spot moves along the direction of long diameter (5mm) with scan velocity V=600mm/min, and the overlapping rate of the twice laser beam that links to each other is 25%.
Other embodiments are identical with embodiment 1, and the contrast of primary coat and final coating is referring to embodiment 1.
In the present embodiment, in the Ni base class diamond powdered alloy, Ni 43% by mass percentage, and Cr 22%, W 10%, Mo 10%, Cu 10% and Al 5%, and the granularity of powder is 20 μ m.
Select JK3000 type HVAF in the present embodiment for use, main combustion gases O
2Flow be 40SCCM, auxilliary combustion gases H
2Flow be 60SCCM; Main combustion gases and auxilliary combustion gases the combustion chamber be ejected into matrix surface after Ni base class diamond powdered alloy mixes; Jet length is 8inch, and powder feeding rate is 40g/min, and combustion chamber pressure is 7bar; Sedimentation rate is 6 μ m/min, and spraying back primary coat thickness is 300 μ m.
The laser beam that laser beam flying uses power to be of a size of 5mm * 4mm as 10kW, oval hot spot moves along the direction of long diameter (5mm) with scan velocity V=400mm/min, and the overlapping rate of the twice laser beam that links to each other is 25%.
Other embodiments are identical with embodiment 1, and the contrast of primary coat and final coating is referring to embodiment 1.
Claims (8)
1. the preparation method of a pyrolic alloy base self-lubricating anti-corrosion wear coating is characterized in that, may further comprise the steps:
(1) uses HVAF that Ni base class diamond powdered alloy is sprayed on and make primary coat on the matrix;
(2) use laser beam flying to make final coating to primary coat.
2. the preparation method of a kind of pyrolic alloy base self-lubricating anti-corrosion wear coating according to claim 1; It is characterized in that: in the said Ni base class diamond powdered alloy; By mass percentage; Ni 40～60%, and Cr 15～30%, W 9～15%, Mo 8～12%, Cu 4～10% and Al 1～5%.
3. the preparation method of a kind of pyrolic alloy base self-lubricating anti-corrosion wear coating according to claim 2 is characterized in that: the granularity of said Ni base class diamond powdered alloy is 15～45 μ m.
4. the preparation method of a kind of pyrolic alloy base self-lubricating anti-corrosion wear coating according to claim 1 is characterized in that: in the said step (1), before HVAF, matrix is used Al more earlier with after the acetone
2O
3Carry out sandblasting.
5. the preparation method of a kind of pyrolic alloy base self-lubricating anti-corrosion wear coating according to claim 4 is characterized in that: said Al
2O
3Granularity be 50～80 orders.
6. the preparation method of a kind of pyrolic alloy base self-lubricating anti-corrosion wear coating according to claim 1 is characterized in that: in the said step (1), and during HVAF, main combustion gases O
2Flow be 20～50SCCM, auxilliary combustion gases H
2Flow be 40～70SCCM; Main combustion gases and auxilliary combustion gases the combustion chamber be ejected into matrix surface after Ni base class diamond powdered alloy mixes; Jet length is 5～10inch, and powder feeding rate is 30～50g/min, and combustion chamber pressure is 5～10bar; Sedimentation rate is 3～7 μ m/min, and spraying back primary coat thickness is 250～350 μ m.
7. the preparation method of a kind of pyrolic alloy base self-lubricating anti-corrosion wear coating according to claim 1 is characterized in that: laser beam flying use power is the CO of 4～10kW, spot diameter 4～5mm, sweep velocity 300～600mm/min in the said step (2)
2Continuous-wave laser beam.
8. the preparation method of a kind of pyrolic alloy base self-lubricating anti-corrosion wear coating according to claim 7 is characterized in that: during said laser beam flying, the overlapping rate of adjacent twice laser beam is 10%～30%.
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| CN104278227A (en) * | 2013-07-02 | 2015-01-14 | 中国科学院兰州化学物理研究所 | Preparation technology for all-metal-phase wide-temperature-range self-lubricating coating |
| CN104762533A (en) * | 2015-05-03 | 2015-07-08 | 张金荣 | Impeller-type fire pump |
| CN105779925A (en) * | 2016-03-07 | 2016-07-20 | 福建工程学院 | Supersonic flame spraying and powder prearranging method for laser cladding |
| CN105779926A (en) * | 2016-06-02 | 2016-07-20 | 太原理工大学 | New process of preparing high-temperature solar selective absorbing coating used in atmospheric environment |
| CN105925828A (en) * | 2016-01-04 | 2016-09-07 | 哈尔滨工业大学深圳研究生院 | Ni-based alloy / alkaline earth metal sulfate / Ag composite material and preparation method thereof |
| CN105925928A (en) * | 2016-06-22 | 2016-09-07 | 成都成发科能动力工程有限公司 | Surface treatment method for blade of large turbine machine |
| CN108251783A (en) * | 2017-12-21 | 2018-07-06 | 中国石油大学(华东) | A kind of preparation method of the micro- texture surface vacuum plasma self-lubricating coat in use of laser |
| CN108707810A (en) * | 2018-05-30 | 2018-10-26 | 宋学荣 | A kind of sewage disposal pipeline valve ball |
| CN108754390A (en) * | 2018-06-19 | 2018-11-06 | 北京矿冶科技集团有限公司 | The preparation method of the small-bore graphite crucible protective coating of melting radioactive metal |
| CN109434125A (en) * | 2018-12-11 | 2019-03-08 | 安阳工学院 | A kind of NiTiAl based self lubricated composite material and preparation method thereof with self regulating and control function |
| CN112593179A (en) * | 2019-09-17 | 2021-04-02 | 天津市机械涂层研究所有限责任公司 | Method for improving wear resistance and corrosion resistance of surface of guide roller of lithium battery coating machine |
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| CN104762533A (en) * | 2015-05-03 | 2015-07-08 | 张金荣 | Impeller-type fire pump |
| CN105925828A (en) * | 2016-01-04 | 2016-09-07 | 哈尔滨工业大学深圳研究生院 | Ni-based alloy / alkaline earth metal sulfate / Ag composite material and preparation method thereof |
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Application publication date: 20120425 |