CN106435454A - Preparation method of high temperature resistant abrasion resistant coating of circulating fluidized bed boiler - Google Patents
Preparation method of high temperature resistant abrasion resistant coating of circulating fluidized bed boiler Download PDFInfo
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- CN106435454A CN106435454A CN201611015266.9A CN201611015266A CN106435454A CN 106435454 A CN106435454 A CN 106435454A CN 201611015266 A CN201611015266 A CN 201611015266A CN 106435454 A CN106435454 A CN 106435454A
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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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- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention discloses a preparation method of a high temperature resistant abrasion resistant coating of a circulating fluidized bed boiler. The preparation method comprises the steps of (1) carrying out sand blasting roughening on the surfaces of parts of the circulating fluidized bed boiler; (2) washing the surfaces subjected to sand blasting roughening with acetone and ethyl alcohol, and drying the surfaces; and (3) spraying an NiCrAlY intermediate coating on the roughened and cleaned surfaces through plasma spraying, and then, spraying Cr3C2-NiCr-WC-Si3N4 particles through plasma spraying, wherein conditions of the plasma spraying technology are that the main air pressure is 0.7 MPa to 1.0 MPa, the auxiliary air pressure is 0.6 MPa to 0.9 MPa, the main air flow is 1300 l/h to 1800 l/h, the auxiliary air flow is 900 l/h to 1100 l/h, the arc current is 450 A to 600 A, the arc voltage is 85 V to 100 V, the powder feeding air pressure is 0.2 MPa to 0.4 MPa, the powder feeding air flow is 280 l/h to 400 l/h, the spraying distance is 100 mm to 150 mm, the spraying speed is 2 kg/h to 3 kg/h, and the spraying thickness is 1 mm to 2.5 mm. When being utilized in the circulating fluidized bed boiler, the coating can resist high temperature corrosion and high temperature abrasion, is firm and does not fall off.
Description
Technical field
The present invention relates to a kind of system of the high temperature resistant wear-resistant erosion resisting coating of field of material technology, more particularly to CFBB
Preparation Method.
Background technology
From the difference of conventional boiler, CFBB is that its combustion system is different, 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 which in the 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 the process for returning them to be participated in stove again burning.This special burning
Mode makes CFBB have the unexistent feature of many conventional boiler.
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 pushing away further 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, and which weares and teares 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 limestone, 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 combustor emulsion zone is up to 100-100kg/m3, dilute-phase zone is also 5-50kg/m3,
Hundreds of times are arrived for tens times of pulverized-coal fired boiler；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 is averagely up to 4-10m/s；Additionally, in flue gas also containing CO,
H2S、SO2, the corrosive gas such as HC1.
Therefore CFBB coating must be with 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.
Content of the invention
It is an object of the invention to a kind of preparation method of the high temperature resistant wear-resistant erosion resisting coating of CFBB is proposed, described
Coating when being used for CFBB can high-temperature corrosion resistance and high temperature abrasion, and coating firmly do not fall off.
For reaching this purpose, the present invention is employed the following technical solutions：
A kind of preparation method of CFBB is high temperature resistant wear-resistant erosion resisting coating, which includes：
(1) sandblasting of CFBB parts surface is roughened；
(2) surface of sandblasting roughening is successively washed with acetone and ethanol, and is dry；
(3) the surface plasma spraying NiCrAlY inter coat after being roughened and cleaning up, subsequent plasma spraying
Cr3C2-NiCr-WC-Si3N4Granule, 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-Si3N4Granule, its weight ratio is 5-3:1:0.5-2:0.5-
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.
The present invention is from NiCrAlY alloy powder as gradient ceramic coating intermediate layer.NiCrAlY alloy powder is to use
The alloy powder that temperature is higher, high-temperature comprehensive property is excellent.Al is strong deoxidizer, therefore Al2O3External agency can be suppressed to mother
The corrosion further of material metal.And the hardness height of Cr, the Cr of generation2O3Oxide-film can not only prevent gas to the further of coating
Oxidation, while the wearability of coating can also be strengthened.The addition of a small amount of yttrium, can promote the α-Al with protectiveness2O3The shape of film
Become, improve the adhesiveness of Ni-Cr-Al alloy oxide film and matrix, prevent the peeling of oxide-film；Increase bond strength and improve and apply
The antioxygenic property of layer.
Containing the alloy unit that Al and Cr both corrosion resisting properties are very outstanding in NiCrAlY alloy as bond coating
Element, i.e., form one layer of fine and close oxide-film in alloy surface, prevents interface oxygen atom by oxide-film to internal diffusion, and oxygen
Changing film being capable of intactly covering alloy surface.In addition the addition of alloy Y, can promote the α-Al with protectiveness2O3The formation of film,
Improve the adhesiveness of Ni-Cr-Al alloy oxide film and matrix, prevent the peeling of oxide-film.Plasma spraying ceramic coat is again right
Bottom has played the effect of good covering protection, further increases the corrosion resisting property of alloy.
NiCrAlY of the present invention, between its each composition, ratio does not do specific restriction, as long as each composition reaches effectively
Amount, for example, its atomic ratio ratio can be 1:1:2:0.3,1:1.5:3:0.5.
The present invention is by selecting specific heat resistant and wear resistant erosion resisting coating composition, and combines with specific technique, in circulation
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% of matrix or so.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 CFBB is high temperature resistant wear-resistant erosion resisting coating, which includes：
(1) sandblasting of CFBB parts surface is roughened；
(2) surface of sandblasting roughening is successively washed with acetone and ethanol, and is dry；
(3) the surface plasma spraying NiCrAlY inter coat after being roughened and cleaning up, subsequent plasma spraying
Cr3C2-NiCr-WC-Si3N4Granule, 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 CFBB is high temperature resistant wear-resistant erosion resisting coating, which includes：
(1) sandblasting of CFBB parts surface is roughened；
(2) surface of sandblasting roughening is successively washed with acetone and ethanol, and is dry；
(3) the surface plasma spraying NiCrAlY inter coat after being roughened and cleaning up, subsequent plasma spraying
Cr3C2-NiCr-WC-Si3N4Granule, 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 CFBB is high temperature resistant wear-resistant erosion resisting coating, which includes：
(1) sandblasting of CFBB parts surface is roughened；
(2) surface of sandblasting roughening is successively washed with acetone and ethanol, and is dry；
(3) the surface plasma spraying NiCrAlY inter coat after being roughened and cleaning up, subsequent plasma spraying
Cr3C2-NiCr-WC-Si3N4Granule, 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 1-2 is prepared, through actually used 100 hours, shut-down inspection surface, have no obvious 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, it is achieved that high-temperature corrosion resistance and high temperature resistant
The technique effect of abrasion.
Claims (3)
1. the preparation method of the high temperature resistant wear-resistant erosion resisting coating of a kind of CFBB, which includes：
(1) sandblasting of CFBB parts surface is roughened；
(2) surface of sandblasting roughening is successively washed with acetone and ethanol, and is dry；
(3) the surface plasma spraying NiCrAlY inter coat after being roughened and cleaning up, subsequent plasma spraying Cr3C2-
NiCr-WC-Si3N4Granule, 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 high temperature resistant wear-resistant erosion resisting coating of CFBB as claimed in claim 1, it is characterised in that institute
The Cr for stating3C2-NiCr-WC-Si3N4Granule, its weight ratio is 5-3:1:0.5-2:0.5-2.
3. the preparation method of the high temperature resistant wear-resistant erosion resisting coating of CFBB 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 |
|---|---|---|---|
| CN201611015266.9A CN106435454A (en) | 2016-11-18 | 2016-11-18 | Preparation method of high temperature resistant abrasion resistant coating of circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611015266.9A CN106435454A (en) | 2016-11-18 | 2016-11-18 | Preparation method of high temperature resistant abrasion resistant coating of circulating fluidized bed boiler |
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| Publication Number | Publication Date |
|---|---|
| CN106435454A true CN106435454A (en) | 2017-02-22 |
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| CN201611015266.9A Pending CN106435454A (en) | 2016-11-18 | 2016-11-18 | Preparation method of high temperature resistant abrasion resistant coating of circulating fluidized bed boiler |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101597736A (en) * | 2009-07-03 | 2009-12-09 | 北京工业大学 | A kind of high hardness erosion resistance cored wire that adds norbide |
| CN102851632A (en) * | 2012-10-11 | 2013-01-02 | 江苏科技大学 | Method for preparing high-temperature wear-resistant coating on continuous casting crystallizer copper alloy plate surface |
-
2016
- 2016-11-18 CN CN201611015266.9A patent/CN106435454A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101597736A (en) * | 2009-07-03 | 2009-12-09 | 北京工业大学 | A kind of high hardness erosion resistance cored wire that adds norbide |
| CN102851632A (en) * | 2012-10-11 | 2013-01-02 | 江苏科技大学 | Method for preparing high-temperature wear-resistant coating on continuous casting crystallizer copper alloy plate surface |
Non-Patent Citations (6)
| 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》 * |
| 吴燕明等: "《表面工程与再制造技术——热喷涂替代电镀铬研究与应用》", 31 May 2016, 中国水利水电出版社 * |
| 周元康等: "《陶瓷表面技术》", 31 January 2007, 国防工业出版社 * |
| 易健宏: "《粉末冶金材料》", 31 July 2016, 中南大学出版社 * |
| 束德林: "《工程材料力学性能 第3版》", 30 June 2016, 机械工业出版社 * |
| 范吉明等: ""Cr3C2-NiCr涂层等离子喷涂工艺参数的优化"", 《材料热处理技术》 * |
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Application publication date: 20170222 |
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