CN106555147A - A kind of preparation method of CFBB high temperature resistant anti scuffing gradient coating - Google Patents
A kind of preparation method of CFBB high temperature resistant anti scuffing gradient coating Download PDFInfo
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- CN106555147A CN106555147A CN201611015160.9A CN201611015160A CN106555147A CN 106555147 A CN106555147 A CN 106555147A CN 201611015160 A CN201611015160 A CN 201611015160A CN 106555147 A CN106555147 A CN 106555147A
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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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Abstract
The invention discloses a kind of preparation method of CFBB high temperature resistant anti scuffing gradient coating, which 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 NiCrAlY inter coats being roughened and after cleaning up, subsequent plasma spraying Cr3C2NiCr BN granules, the plasma spray coating process condition include：0.7 1.0MPa of main atmospheric pressure, 0.6 0.9MPa of auxiliary atmospheric pressure, 1300 1800l/h of primary air amount, 900 1100l/h of auxiliary throughput, 450 600A of arc current, 85 100V of arc voltage, 0.2 0.4MPa of powder feeding atmospheric pressure, 280 400l/h of powder feeding throughput, 100 150mm of spray distance, 2 3kg/h of spraying rate, 1 2.5mm of coating layer thickness.The coating when being used for CFBB can high-temperature corrosion resistance and high temperature abrasion, and coating firmly do not fall off.
Description
Technical field
The present invention relates to field of material technology, more particularly to a kind of CFBB high temperature resistant anti scuffing Cr3C2-
The preparation method of NiCr-BN gradient coatings.
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 are the cyclic processes 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 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
It is wide to apply.
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 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,
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, which 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 NiCrAlY inter coats being roughened and after cleaning up, subsequent plasma spraying
Cr3C2- NiCr-BN granules, the plasma spray coating process condition include：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-BN granules, its weight ratio are 5-3:1:0.5-2.
Midcoat thickness of the present invention is 0.2-0.6mm, Cr3C2- NiCr-BN coating layer thicknesses are 0.8-2.3mm,
Total coating thickness is 1-2.5mm.
Compared to other working linings, the present invention adopts Cr3C2- NiCr-BN is used as working lining.The BN which adopts is six sides
Boron nitride, its coefficient of friction very low and high temperature stability is fine, resistance to heat shocks fine, intensity is very high, heat conductivity is very high, expansion
Coefficient is relatively low, resistivity is very big, corrosion-resistant, the Cr with the present invention3C2- NiCr is combined, and can not only improve its high-temperature thermal stability
Property, its frictional resistance is also effectively reduced, reduces indirectly abrasion.
The present invention is from NiCrAlY alloy powders as gradient ceramic coating intermediate layer.NiCrAlY alloy powders are to use
Temperature is higher, the alloy powder that high-temperature comprehensive property is excellent.Al is strong deoxidizer, therefore Al2O3External agency can be suppressed to mother
The further corrosion of material metal.And the hardness of Cr is high, 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
Into improving the adhesiveness of Ni-Cr-Al alloy oxide films 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 alloys 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.The addition of alloy Y in addition, can promote the α-Al with protectiveness2O3The formation of film,
Improve the adhesiveness of Ni-Cr-Al alloy oxide films and matrix, prevent the peeling of oxide-film.Plasma spraying ceramic coat is again right
Bottom has played good covering protection effect, 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 CFBB high temperature resistant anti scuffing Cr3C2The preparation method of-NiCr-BN gradient coatings, which 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 NiCrAlY inter coats being roughened and after cleaning up, subsequent plasma spraying
Cr3C2- NiCr-BN granules, the plasma spray coating process condition include：Main atmospheric pressure 0.7MPa, auxiliary atmospheric pressure 0.6MPa, it is main
Throughput 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 CFBB high temperature resistant anti scuffing Cr3C2The preparation method of-NiCr-BN gradient coatings, which 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 NiCrAlY inter coats being roughened and after cleaning up, subsequent plasma spraying
Cr3C2- NiCr-BN granules, the plasma spray coating process condition include：Main atmospheric pressure 1.0MPa, auxiliary atmospheric pressure 0.9MPa, it is main
Throughput 1800l/h, auxiliary throughput 1100l/h, arc current 600A, arc voltage 100V, powder feeding atmospheric pressure 0.4MPa, powder feeding air-flow
Amount 400l/h, spray distance 150mm, spraying rate 3kg/h, coating layer thickness 2.5mm.
Embodiment 3
A kind of CFBB high temperature resistant anti scuffing Cr3C2The preparation method of-NiCr-BN gradient coatings, which 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 NiCrAlY inter coats being roughened and after cleaning up, subsequent plasma spraying
Cr3C2- NiCr-BN granules, the plasma spray coating process condition include：Main atmospheric pressure 0.8MPa, auxiliary atmospheric pressure 0.7MPa, it is main
Throughput 1500l/h, auxiliary throughput 1000l/h, arc current 500A, arc voltage 90V, powder feeding atmospheric pressure 0.3MPa, powder feeding air-flow
Amount 350l/h, spray distance 120mm, spraying rate 2.5kg/h, coating layer thickness 2mm.
The coating that embodiment 1-2 is prepared, Jing are 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, which 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 NiCrAlY inter coats being roughened and after cleaning up, subsequent plasma spraying Cr3C2-
NiCr-BN granules, the plasma spray coating process condition include：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 gas
Pressure 0.2-0.4MPa, powder feeding throughput 280-400l/h, spray distance 100-150mm, spraying rate 2-3kg/h apply thickness
Degree 1-2.5mm.
2. CFBB high temperature resistant anti scuffing Cr as claimed in claim 13C2The preparation side of-NiCr-BN gradient coatings
Method, it is characterised in that described Cr3C2- NiCr-BN granules, its weight ratio are 5-3:1:0.5-2.
3. CFBB high temperature resistant anti scuffing Cr as claimed in claim 1 or 23C2The system of-NiCr-BN gradient coatings
Preparation Method, it is characterised in that described midcoat thickness is 0.2-0.6mm, Cr3C2- NiCr-BN coating layer thicknesses are 0.8-
2.3mm, total coating thickness are 1-2.5mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611015160.9A CN106555147A (en) | 2016-11-18 | 2016-11-18 | A kind of preparation method of CFBB high temperature resistant anti scuffing gradient coating |
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| CN201611015160.9A CN106555147A (en) | 2016-11-18 | 2016-11-18 | A kind of preparation method of CFBB high temperature resistant anti scuffing gradient coating |
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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 CN201611015160.9A patent/CN106555147A/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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