CN106637042A - Preparation method for high-temperature-resistant anti-abrasion gradient coating of circulating fluidized bed boiler - Google Patents
Preparation method for high-temperature-resistant anti-abrasion gradient coating of circulating fluidized bed boiler Download PDFInfo
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- CN106637042A CN106637042A CN201611015490.8A CN201611015490A CN106637042A CN 106637042 A CN106637042 A CN 106637042A CN 201611015490 A CN201611015490 A CN 201611015490A CN 106637042 A CN106637042 A CN 106637042A
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- Prior art keywords
- coating
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- spraying
- cfbb
- fluidized bed
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention discloses a preparation method for a high-temperature-resistant anti-abrasion gradient coating of a circulating fluidized bed boiler. The preparation method comprises the following steps of: (1) performing sand-blasting roughening on the surface of a part of the circulating fluidized bed boiler; (2) washing the sand-blast roughened surface by acetone and alcohol in sequence, and drying the surface; (3) plasma-spraying a NiCrBSi middle coating on the roughened and cleaned surface, and then plasma-spraying Cr3C2-NiCr-WC-Si3N4 particles, wherein the plasma-spraying process conditions comprise: primary gas pressure of 0.7-1.0 MPa, auxiliary gas pressure of 0.6-0.9 MPa, primary gas flow of 1300-1800 l/h, auxiliary gas flow of 900-1100 l/h, arc current of 450-600A, arc voltage of 85-100 V, powder feeding gas pressure of 0.2-0.4 MPa, powder feeding gas flow of 280-400 l/h, a spraying distance of 100-150 mm, spraying speed of 2-3 kg/h, and a coating thickness of 1-2.5 mm. The coating can be resistant to high-temperature corrosion and high-temperature abrasion while used for the circulating fluidized bed boiler, is firm and does not drop.
Description
Technical field
The present invention relates to field of material technology, more particularly to a kind of system of the wear-resistant erosion resisting coating of CFBB high temperature resistant
Preparation Method.
Background technology
CFBB is that its combustion system is different from the difference of conventional boiler, gas-solid feed separation equipment and solid
Body Recycle of material equipment is the principal character of CFBB.The burning of CFBB includes inside and outside circulation
Two processes, interior circulation is the cyclic process in burner hearth, i.e., the turbulent perturbation pole that the flue gas of high-speed motion is carried with it in stove
Strong solid particle close contact, and have the fluidized combustion course of reaction of a large amount of solid back-mixings.And outer circulation is incited somebody to action outside stove
The solid particle of most high temperature is collected, and returns them to the process for participating in again burning in stove.This special burning
Mode makes CFBB have the unexistent feature of many conventional boilers.
Special combustion system brings series of advantages for recirculating fluidized bed, but while also result in heating surface tubes in boilers
High temperature wear and corrosion.This defect is never preferably solved, and limits further pushing away for CFBB
Wide application.
The heating surface tube of CFBB includes water-cooling wall, superheater, reheater, economizer and flue etc., domestic
The CFBB of manufacture is mostly also disposed with pipe laying heating surface in emulsion zone.Compared with other types boiler, recycle stream
The working condition of the heating surface tube of fluidized bed boiler is more severe, its abrasion and solid material concentration, flue gas flow rate, particle characteristics etc.
Factor is closely related.The coal of burning in circulating fluid bed boiler mostly is low heat value colm (gangue, mud coal etc.), solid material
The average particle size of (including fuel, desulfurizing agent lime stone, bed etc.) is 0-8mm, and the coal powder size that coal-powder boiler is used is only
20-50 μm or so, the solid material concentration of combustion chamber emulsion zone is up to 100-100kg/m3, dilute-phase zone is also 5-50kg/m3,
Tens times for pulverized-coal fired boiler arrive hundreds of times；Material burns the flying dust containing 10-20% in the high-temperature flue gas to be formed, and contains in flying dust
There is dystectic hard particles (predominantly SiO2), its operating air velocity mean height reaches 4-10m/s；Additionally, in flue gas also containing CO,
H2S、SO2, the corrosive gas such as HC1.
Therefore CFBB coating must have good heat conductivility, and thermal coefficient of expansion and base material phase
Closely, to avoid coating shedding, and high-temperature corrosion resistance and high temperature abrasion are wanted.
The content of the invention
It is an object of the invention to a kind of preparation method of CFBB high temperature resistant anti scuffing gradient coating is proposed,
The coating when being used for CFBB can high-temperature corrosion resistance and high temperature abrasion, and coating firmly do not fall off.
It is that, up to this purpose, the present invention is employed the following technical solutions：
A kind of preparation method of CFBB high temperature resistant anti scuffing gradient coating, it includes：
(1) sandblasting of CFBB parts surface is roughened；
(2) surface of the sandblasting roughening is successively washed with acetone and ethanol, and is dried；
(3) in the surface plasma spraying NiCrBSi inter coats being roughened and after cleaning up, subsequent plasma spraying
Cr3C2-NiCr-WC-Si3N4Particle, the plasma spray coating process condition includes：Main atmospheric pressure 0.7-1.0MPa, auxiliary atmospheric pressure
0.6-0.9MPa, primary air amount 1300-1800l/h, auxiliary throughput 900-1100l/h, arc current 450-600A, arc voltage 85-
100V, powder feeding atmospheric pressure 0.2-0.4MPa, powder feeding throughput 280-400l/h, spray distance 100-150mm, spraying rate 2-
3kg/h, coating layer thickness 1-2.5mm.
Preferably, Cr of the present invention3C2-NiCr-WC-Si3N4Particle, its weight ratio is 5-3:1:0.5-2.
Midcoat thickness of the present invention is 0.2-0.6mm, Cr3C2-NiCr-WC-Si3N4Coating layer thickness is 0.8-
2.3mm, total coating thickness is 1-2.5mm.
Compared to other bond coatings, using NiCrBSi as bond coating, it serves reduction heat treatment to the present invention
Temperature, improve the effect that matrix is connected property with working lining, realize good combination.
NiCrBSi of the present invention, ratio does not do specific restriction between its each composition, as long as each composition reaches effectively
Amount.For example, its content be Cr 14-18wt%, B 3-4.5wt%, Si 3.5-5.5wt%, Ni surpluses.
The present invention is being circulated by selecting specific heat resistant and wear resistant erosion resisting coating composition, and in combination with specific technique
Fluidized-bed combustion boiler surface prepares the coating of high-temperature corrosion resistance and high temperature abrasion, solves prior art indeterminable scarce
Fall into.
The coating that the present invention is prepared, its microhardness is in 920HV0.981More than, at 30 ° of erosion angles and 90 ° of erosion angles
Under, its Wear rate well below matrix, simply 10% or so of matrix.The coating being capable of high-temperature corrosion resistance and high temperature mill
Lose, and coating does not firmly fall off.
Specific embodiment
Technical scheme is further illustrated below by specific embodiment.
Embodiment 1
A kind of preparation method of the wear-resistant erosion resisting coating of CFBB high temperature resistant, it includes：
(1) sandblasting of CFBB parts surface is roughened；
(2) surface of the sandblasting roughening is successively washed with acetone and ethanol, and is dried；
(3) in the surface plasma spraying NiCrBSi inter coats being roughened and after cleaning up, subsequent plasma spraying
Cr3C2-NiCr-WC-Si3N4Particle, the plasma spray coating process condition includes：Main atmospheric pressure 0.7MPa, auxiliary atmospheric pressure
0.6MPa, primary air amount 1300l/h, auxiliary throughput 900l/h, arc current 450A, arc voltage 85V, powder feeding atmospheric pressure 0.2MPa,
Powder feeding throughput 280l/h, spray distance 100mm, spraying rate 2kg/h, coating layer thickness 1mm.
Embodiment 2
A kind of preparation method of the wear-resistant erosion resisting coating of CFBB high temperature resistant, it includes：
(1) sandblasting of CFBB parts surface is roughened；
(2) surface of the sandblasting roughening is successively washed with acetone and ethanol, and is dried；
(3) in the surface plasma spraying NiCrBSi inter coats being roughened and after cleaning up, subsequent plasma spraying
Cr3C2-NiCr-WC-Si3N4Particle, the plasma spray coating process condition includes：Main atmospheric pressure 1.0MPa, auxiliary atmospheric pressure
0.9MPa, primary air amount 1800l/h, auxiliary throughput 1100l/h, arc current 600A, arc voltage 100V, powder feeding atmospheric pressure
0.4MPa, powder feeding throughput 400l/h, spray distance 150mm, spraying rate 3kg/h, coating layer thickness 2.5mm.
Embodiment 3
A kind of preparation method of the wear-resistant erosion resisting coating of CFBB high temperature resistant, it includes：
(1) sandblasting of CFBB parts surface is roughened；
(2) surface of the sandblasting roughening is successively washed with acetone and ethanol, and is dried；
(3) in the surface plasma spraying NiCrBSi inter coats being roughened and after cleaning up, subsequent plasma spraying
Cr3C2-NiCr-WC-Si3N4Particle, the plasma spray coating process condition includes：Main atmospheric pressure 0.8MPa, auxiliary atmospheric pressure
0.7MPa, primary air amount 1500l/h, auxiliary throughput 1000l/h, arc current 500A, arc voltage 90V, powder feeding atmospheric pressure 0.3MPa,
Powder feeding throughput 350l/h, spray distance 120mm, spraying rate 2.5kg/h, coating layer thickness 2mm.
The coating that embodiment 1-3 is prepared, Jing is actually used 100 hours, shut-down inspection surface, have no substantially corrosion and
Abrasion, it was demonstrated that the coating that the present invention is prepared can solve the problem that the defect of prior art, realize high-temperature corrosion resistance and high temperature resistant
The technique effect of abrasion.
Claims (3)
1. a kind of preparation method of CFBB high temperature resistant anti scuffing gradient coating, it includes：
(1) sandblasting of CFBB parts surface is roughened；
(2) surface of the sandblasting roughening is successively washed with acetone and ethanol, and is dried；
(3) in the surface plasma spraying NiCrBSi inter coats being roughened and after cleaning up, subsequent plasma spraying Cr3C2-
NiCr-WC-Si3N4Particle, the plasma spray coating process condition includes：Main atmospheric pressure 0.7-1.0MPa, auxiliary atmospheric pressure 0.6-
0.9MPa, primary air amount 1300-1800l/h, auxiliary throughput 900-1100l/h, arc current 450-600A, arc voltage 85-100V,
Powder feeding atmospheric pressure 0.2-0.4MPa, powder feeding throughput 280-400l/h, spray distance 100-150mm, spraying rate 2-3kg/h,
Coating layer thickness 1-2.5mm.
2. the preparation method of the wear-resistant erosion resisting coating of CFBB high temperature resistant as claimed in claim 1, it is characterised in that institute
The Cr for stating3C2-NiCr-WC-Si3N4Particle, its weight ratio is 5-3:1:0.5-2:0.5-2.
3. the preparation method of the wear-resistant erosion resisting coating of CFBB high temperature resistant as claimed in claim 1 or 2, its feature exists
In described midcoat thickness is 0.2-0.6mm, Cr3C2-NiCr-WC-Si3N4Coating layer thickness is 0.8-2.3mm, and coating is total
Thickness is 1-2.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611015490.8A CN106637042A (en) | 2016-11-18 | 2016-11-18 | Preparation method for high-temperature-resistant anti-abrasion gradient coating of circulating fluidized bed boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611015490.8A CN106637042A (en) | 2016-11-18 | 2016-11-18 | Preparation method for high-temperature-resistant anti-abrasion gradient coating of circulating fluidized bed boiler |
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| CN106637042A true CN106637042A (en) | 2017-05-10 |
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| CN201611015490.8A Pending CN106637042A (en) | 2016-11-18 | 2016-11-18 | Preparation method for high-temperature-resistant anti-abrasion gradient coating of circulating fluidized bed boiler |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1147565A (en) * | 1996-06-06 | 1997-04-16 | 西安交通大学 | Metal-carbide coating preventing superheater of power station boiler from heat corrosion |
| CN102115884A (en) * | 2011-03-23 | 2011-07-06 | 北京矿冶研究总院 | Preparation method of wear-resistant and corrosion-resistant composite coating |
| CN104264102A (en) * | 2014-10-15 | 2015-01-07 | 西安石油大学 | Preparation method of nickel base alloy coating on boiler water wall |
-
2016
- 2016-11-18 CN CN201611015490.8A patent/CN106637042A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1147565A (en) * | 1996-06-06 | 1997-04-16 | 西安交通大学 | Metal-carbide coating preventing superheater of power station boiler from heat corrosion |
| CN102115884A (en) * | 2011-03-23 | 2011-07-06 | 北京矿冶研究总院 | Preparation method of wear-resistant and corrosion-resistant composite coating |
| CN104264102A (en) * | 2014-10-15 | 2015-01-07 | 西安石油大学 | Preparation method of nickel base alloy coating on boiler water wall |
Non-Patent Citations (1)
| Title |
|---|
| 刘艳等: "《等离子喷涂NiCr－Cr3C2涂层高温摩擦磨损性能研究》", 《电焊机》 * |
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Application publication date: 20170510 |