CN101709657A - Surface wear-resistant layer of high-pressure nozzle cascade of turbine and preparation method thereof - Google Patents
Surface wear-resistant layer of high-pressure nozzle cascade of turbine and preparation method thereof Download PDFInfo
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- CN101709657A CN101709657A CN200910216304A CN200910216304A CN101709657A CN 101709657 A CN101709657 A CN 101709657A CN 200910216304 A CN200910216304 A CN 200910216304A CN 200910216304 A CN200910216304 A CN 200910216304A CN 101709657 A CN101709657 A CN 101709657A
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- resistant layer
- surface wear
- turbine
- cascade
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- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000000576 coating method Methods 0.000 claims abstract description 35
- 239000011248 coating agent Substances 0.000 claims abstract description 33
- 229910001120 nichrome Inorganic materials 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000010285 flame spraying Methods 0.000 claims abstract description 6
- 239000000843 powder Substances 0.000 claims description 21
- 239000007921 spray Substances 0.000 claims description 13
- 229910045601 alloy Inorganic materials 0.000 claims description 9
- 239000000956 alloy Substances 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 8
- 239000000567 combustion gas Substances 0.000 claims description 8
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- 238000010286 high velocity air fuel Methods 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 3
- 238000002161 passivation Methods 0.000 claims description 3
- 238000005488 sandblasting Methods 0.000 claims description 3
- 238000003672 processing method Methods 0.000 claims 1
- 238000003466 welding Methods 0.000 abstract description 6
- 238000005254 chromizing Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000005336 cracking Methods 0.000 abstract description 3
- 238000005496 tempering Methods 0.000 abstract description 2
- 230000008646 thermal stress Effects 0.000 abstract description 2
- 238000005507 spraying Methods 0.000 description 17
- 238000012360 testing method Methods 0.000 description 6
- 208000037656 Respiratory Sounds Diseases 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000005255 carburizing Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 241000549095 Paxistima myrsinites Species 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 229910001347 Stellite Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- AHICWQREWHDHHF-UHFFFAOYSA-N chromium;cobalt;iron;manganese;methane;molybdenum;nickel;silicon;tungsten Chemical compound C.[Si].[Cr].[Mn].[Fe].[Co].[Ni].[Mo].[W] AHICWQREWHDHHF-UHFFFAOYSA-N 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
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- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000002679 ablation Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000008642 heat stress Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Landscapes
- Coating By Spraying Or Casting (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
The invention provides a surface wear-resistant layer of a high-pressure nozzle cascade of a turbine and a preparation method thereof. The surface wear-resistant layer is a Cr3C2-NiCr coating; and after the cascade is welded to form a nozzle chamber, the surface wear-resistant layer is prepared by adopting a hypersonic flame spraying method, wherein the thickness of the Cr3C2-NiCr coating is between 0.15 and 0.20 millimeter. The surface wear-resistant Cr3C2-NiCr coating enhances the performance of wear resistance and high-temperature resistance of workpieces, has small thermal stress, makes the workpieces insusceptible to cracking during use and effectively improves the service life of the workpieces. The preparation process of the Cr3C2-NiCr coating overcomes the drawback of easy cracking of the surface coating prepared by the conventional process that the cascade is formed by welding through carburization and chromizing, avoids tempering, has simple and easy-to-operate technical process, improves working efficiency, saves energy, reduces emission and reduces the manufacturing cost of the turbine greatly.
Description
Technical field
The present invention relates to the manufacture field of steam turbine, be specifically related to surface wear-resistant layer of a kind of high-pressure nozzle cascade of turbine and preparation method thereof.
Background technique
In the supercritical turbine group, during the work of high-pressure nozzle box leaf grating, be subject to the solid particle erosion of high temperature, high pressure.For strengthening the surface hardness and wear-resisting, the heat-resisting ability of high-pressure nozzle box leaf grating, offshore company is when the high-pressure nozzle box Design of Cascade, usually adopt 1000MW, 660MW nozzle blade cascade are adopted first carburizing, back chromising at the side place of giving vent to anger, and then the use vacuum heat treatment process, make the nozzle blade cascade surface form the Cr-C diffusion layer.Its deficiency is to refill when being welded into leaf grating after single blade carburizing, chromising are handled, and very easily crackle occurs in the heat affected zone, influences the working life of Cr-C diffusion layer, even can crack at the blade matrix, finally may cause the fracture of blade.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of surface wear-resistant layer of high-pressure nozzle cascade of turbine, make high-pressure nozzle cascade not be subject to erosion, high temperature resistant.
The technological scheme that the present invention takes is:
A kind of surface wear-resistant layer of high-pressure nozzle cascade of turbine, described surface wear-resistant layer is Cr
3C
2-NiCr coating, leaf grating dress is welded into the nozzle box after, adopt supersonic flame spraying method to make.
Described Cr
3C
2-NiCr coating thickness is 0.15～0.20mm.
The preparation method of the surface wear-resistant layer of this high-pressure nozzle cascade of turbine the steps include:
(1) the leaf grating dress is welded into the nozzle box;
(2) use cleaning solution cleaning leaf grating surface to be sprayed, and dry;
(3) treat sprayed surface and do sandblasting pretreatment, remove surface passivation layer;
(4) air pressure 70～100Psi, workpiece temperature less than 150 ℃ environment under, use powder feeder to send Cr
3C
2-NiCr alloy powder carries out HVAF to the leaf grating surface.
Spray parameters in the described step (4) is: air pressure is 70～100Psi, combustion gas 1 pressure is 60～90Psi, combustion gas 2 pressure are 50～80Psi, powder feeding gas is 4～9L/h, powder feed rate is 10～25RPM, and the spray gun travelling speed is 300～500mm/s, and spray distance is 20～200mm, spray angle is 80～90 °, and temperature is less than 150 ℃.
Cleaning solution in the described step (2) adopts acetone.
The 46# white fused alumina is adopted in sandblast in the described step (3).
Cr in the described step (4)
3C
2-NiCr alloy powder component is: the Cr of 70～80 weight %
3C
2, the NiCr of 20～30 weight %.
The beneficial effect that the present invention produces is:
The surface wear-resistant layer of this high-pressure nozzle cascade of turbine is Cr
3C
2-NiCr coating has been strengthened wear-resisting, the resistance to high temperature of workpiece, and the coating thermal stress is little, and workpiece in use is difficult for cracking, and has prolonged the working life of workpiece effectively.Overcome and refilled the disadvantage that cover coat that the technology that is welded into leaf grating makes is prone to crackle after traditional carburizing, chromising are handled.The preparation method of the surface wear-resistant layer of this high-pressure nozzle cascade of turbine need not to carry out temper, and manufacturing process is simple to operation, increases work efficiency, and energy-saving and emission-reduction greatly reduce the manufacturing cost of steam turbine.
The surface wear-resistant layer superior performance of the prepared high-pressure nozzle cascade of turbine of the present invention, metallographic structure, hardness, wear-resisting property, adhesive strength and cupping performance all reach standard-required, see Table 2:
Table 2 coating performance table
| Project | Experimental condition | Experimental result |
| Metallographic structure | 100 *, 500 * | The coating even compact, the crackle that times visual field, porosity ratio＜1%, 100 can not be recognized. |
| Hardness | HVS-1000 type microhardness testers, load 300g keeps 10s. | 750～950 |
| Wear-resisting property | The coating sample is as static element, and Stellite 6 welding samples have carried out comparative trial as movement parts on the high temperature friction and wear testing machine.Test temperature: 400 ℃ (in atmosphere), load: 50N, stroke: 3mm, reciprocating frequence: 30Hz, test period: 10h, friction condition: dry friction. | Wearing depth: Stellite 6:0.25mm coating: 0.06mm |
| Adhesive strength | ASTM C633 | Minimum 68.5MPa |
| The cupping performance | The sample of size of sample 50mm * 60mm * 1.2mm adopts Φ 22.2 steel balls at the uniform velocity to be pressed into 7.6mm with 10mm/min on universal testing machine. | The equal flawless of coating, nothing are peeled off |
Description of drawings
Fig. 1 is for being wearing layer preparation method's of the present invention step schematic representation.
Embodiment
By to single blade spraying, the spraying of assembly welding leaf grating, coating structure is carried out a large amount of test and researchs such as performance evaluation, after finally having formed the leaf grating dress and being welded in nozzle box's foundry goods, the optimum implementation that sprays again, specific as follows:
A kind of surface wear-resistant layer of high-pressure nozzle cascade of turbine, described surface wear-resistant layer is Cr
3C
2-NiCr coating adopts Cr
3C
2The spraying of-NiCr alloy powder, Cr
3C
2The component of-NiCr alloy powder spraying is: the Cr of 75 weight %
3C
2, the NiCr of 25 weight % makes with supersonic flame spraying method.Described Cr
3C
2-NiCr coating thickness is 0.15～0.20mm.
Cr
3C
2The key of the spraying coating process of-NiCr coating is: after earlier leaf grating dress to be sprayed being welded into the nozzle box, adopt supersonic flame spraying method that it is carried out the surface spraying again.
HVAF is that to utilize propane, propylene etc. hydrocarbon be combustion gas and high pressure oxygen such as combustion gas or hydrogen, or utilize as liquid fuel such as kerosene and high pressure oxygen in special firing chamber, or the high temperature and high speed that burning produces in the special nozzle flame that burns flows.With powder axially or side direction send in the high-speed flame stream, promptly can realize the deposition of the heating of powder particle and acceleration, coating.Because the very high speed of flame flow, spraying particle can be accelerated to the speed up to 300～650m/s when being heated to fusing or semi-molten state, thereby obtains the quality coating of adhesive strength height, densification.
Because the leaf grating behind the assembly welding finally will be adorned weldering and tempering heat treatment with nozzle box's foundry goods.After the individual blade spraying, carry out the simulation dress weldering test of assembly welding blade sections and partition body inner and outer rings.Blade dress postwelding, coating local ablation the in nearly R place peeled off, and has the more bead that splashes on the coating.The blade blade produces 30～45 with the transition Zone R territory coating of integral shroud connecting part, two ends, is close to the pencil crackle of parallel distribution.Have tangible High temperature diffusion bright band between coating and base material, nearly coated substrate (1Cr1lCo3W3NiMoVNbNB) undergoes phase transition recrystallization.For preventing to peel off generation with the intensive pencil hair line in Zone R territory because of dress welding heat stress causes the coating part; Need after the leaf grating dress is welded into the nozzle box, to carry out according to definite spraying coating process.
As shown in Figure 1, the preparation process of the surface wear-resistant layer of high-pressure nozzle cascade of turbine of the present invention is:
1, leaf grating dress is welded into the nozzle box after, spray flow process again.
2, to supplied materials inspection to be sprayed, passed examination enters next procedure again.
3, use cleaning solution,, clean leaf grating surface to be sprayed, and it is dried stand-by as acetone.
4, treat sprayed surface and do pretreatment, use sand blasting machine to Workpiece painting white fused alumina sand, this step is to treat sprayed surface to carry out the sandblast activation processing, removes surface passivation layer.In the present embodiment, the 46# white fused alumina is adopted in sandblast, and nozzle is 150mm to the distance of workpiece, and the gas pressure of injection is controlled at about 0.5MPa, during injection and the angle of workpiece surface be 75 to spend.
5, treat sprayed surface and make HVAF.Use powder feeder to send Cr
3C
2-NiCr alloy powder uses spray gun spraying leaf grating surface; In the present embodiment, the Cr of employing
3C
2The component of-NiCr alloy powder is: 75% Cr
3C
2, 25% NiCr is Cr
3C
2-25NiCr alloy powder.About compressed air pressure 85Psi, combustion gas 1 pressure of HVAF should be controlled at about 80Psi, and combustion gas 2 pressure should be controlled at about 60Psi.The powder throughput that powder feeder is sent is 6L/h, and powder feed rate is 20RPM.Nozzle is 150mm to the distance of workpiece, and the spray gun travelling speed is 500mm/s, during injection and the angle of workpiece surface be 90 °.The temperature of workpiece all is no more than 150 ℃ in whole spraying process.In spraying process, adopt the ABB robot to spray distance, spraying path and coating thickness are accurately controlled, and the zone that does not require spraying is effectively protected.The best spraying parameter that present embodiment is chosen sees Table 1:
Table 1 spraying parameter
When using this supersonic flame spraying method to process the workpiece of other sizes, only need above-mentioned process parameter is suitably adjusted.
6, cleaning coating: remove surface particles, burrs on edges etc.
7, check coating is if the qualified then spraying of coating is finished; If coating is defective, return step 4, use the method for sandblast, with coating removal, processing again.
Claims (7)
1. the surface wear-resistant layer of a high-pressure nozzle cascade of turbine, it is characterized in that: described surface wear-resistant layer is Cr
3C
2-NiCr coating, leaf grating dress is welded into the nozzle box after, adopt supersonic flame spraying method to make.
2. the surface wear-resistant layer of high-pressure nozzle cascade of turbine according to claim 1 is characterized in that: described Cr
3C
2-NiCr coating thickness is 0.15～0.20mm.
3. the preparation method of the surface wear-resistant layer of a high-pressure nozzle cascade of turbine the steps include:
(1) the leaf grating dress is welded into the nozzle box;
(2) use cleaning solution cleaning leaf grating surface to be sprayed, and dry;
(3) treat sprayed surface and do sandblasting pretreatment, remove surface passivation layer;
(4) air pressure 70～100Psi, temperature less than 150 ℃ environment under, use powder feeder to send Cr
3C
2-NiCr alloy powder carries out HVAF to the leaf grating surface.
4. the preparation method of the surface wear-resistant layer of high-pressure nozzle cascade of turbine according to claim 3, it is characterized in that: the spray parameters in the described step (4) is: air pressure is 70～100Psi, combustion gas 1 pressure is 60～90Psi, combustion gas 2 pressure are 50～80Psi, and powder feeding gas is 4～9L/h, and powder feed rate is 10～25RPM, the spray gun travelling speed is 300～500mm/s, spray distance is 20～200mm, and spray angle is 80～90 °, and temperature is less than 150 ℃.
5. the preparation method of the surface wear-resistant layer of high-pressure nozzle cascade of turbine according to claim 3 is characterized in that: the cleaning solution employing acetone in the described step (2).
6. the preparation method of the surface wear-resistant layer of high-pressure nozzle cascade of turbine according to claim 3 is characterized in that: the sandblast employing 46# white fused alumina in the described step (3).
7. the processing method of the cover coat of leaf grating according to claim 3 is characterized in that: the Cr in the described step (4)
3C
2-NiCr alloy powder component is: the Cr of 70～80 weight %
3C
2, the NiCr of 20～30 weight %.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910216304A CN101709657A (en) | 2009-11-21 | 2009-11-21 | Surface wear-resistant layer of high-pressure nozzle cascade of turbine and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910216304A CN101709657A (en) | 2009-11-21 | 2009-11-21 | Surface wear-resistant layer of high-pressure nozzle cascade of turbine and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101709657A true CN101709657A (en) | 2010-05-19 |
Family
ID=42402463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910216304A Pending CN101709657A (en) | 2009-11-21 | 2009-11-21 | Surface wear-resistant layer of high-pressure nozzle cascade of turbine and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101709657A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102330049A (en) * | 2011-09-05 | 2012-01-25 | 广州市天河区金棠表面工程技术有限公司 | Door rod strengthening technology for air pump recycling regulation door |
| CN102634749A (en) * | 2012-05-14 | 2012-08-15 | 上海电气电站设备有限公司 | Spraying technology for low-pressure separating plate of 1000MW-level nuclear power turbine |
| CN107858621A (en) * | 2016-09-21 | 2018-03-30 | 龙岩紫荆创新研究院 | A kind of NiCr Cr3C2The preparation method of coating and the coating |
| CN111530720A (en) * | 2020-04-26 | 2020-08-14 | 马鞍山钢铁股份有限公司 | Technology for processing return fan impeller of chain grate machine |
| CN113025944A (en) * | 2021-03-04 | 2021-06-25 | 哈动国家水力发电设备工程技术研究中心有限公司 | Corrosion protection method for movable guide vane of seawater pump water turbine |
| CN115774036A (en) * | 2023-02-15 | 2023-03-10 | 西南科技大学 | Method, system and device for detecting sand inclusion rate on blade surface |
-
2009
- 2009-11-21 CN CN200910216304A patent/CN101709657A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102330049A (en) * | 2011-09-05 | 2012-01-25 | 广州市天河区金棠表面工程技术有限公司 | Door rod strengthening technology for air pump recycling regulation door |
| CN102634749A (en) * | 2012-05-14 | 2012-08-15 | 上海电气电站设备有限公司 | Spraying technology for low-pressure separating plate of 1000MW-level nuclear power turbine |
| CN107858621A (en) * | 2016-09-21 | 2018-03-30 | 龙岩紫荆创新研究院 | A kind of NiCr Cr3C2The preparation method of coating and the coating |
| CN111530720A (en) * | 2020-04-26 | 2020-08-14 | 马鞍山钢铁股份有限公司 | Technology for processing return fan impeller of chain grate machine |
| CN113025944A (en) * | 2021-03-04 | 2021-06-25 | 哈动国家水力发电设备工程技术研究中心有限公司 | Corrosion protection method for movable guide vane of seawater pump water turbine |
| CN113025944B (en) * | 2021-03-04 | 2023-01-13 | 哈动国家水力发电设备工程技术研究中心有限公司 | Corrosion protection method for movable guide vane of seawater pump water turbine |
| CN115774036A (en) * | 2023-02-15 | 2023-03-10 | 西南科技大学 | Method, system and device for detecting sand inclusion rate on blade surface |
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Application publication date: 20100519 |