CN111334740A - High-temperature wear-resistant self-lubricating coating and preparation method thereof - Google Patents
High-temperature wear-resistant self-lubricating coating and preparation method thereof Download PDFInfo
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- CN111334740A CN111334740A CN201811558436.7A CN201811558436A CN111334740A CN 111334740 A CN111334740 A CN 111334740A CN 201811558436 A CN201811558436 A CN 201811558436A CN 111334740 A CN111334740 A CN 111334740A
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- 238000000576 coating method Methods 0.000 title claims abstract description 38
- 239000011248 coating agent Substances 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000000843 powder Substances 0.000 claims abstract description 61
- 238000005507 spraying Methods 0.000 claims abstract description 36
- 238000002156 mixing Methods 0.000 claims abstract description 20
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 17
- 239000007921 spray Substances 0.000 claims abstract description 17
- 238000005469 granulation Methods 0.000 claims abstract description 16
- 230000003179 granulation Effects 0.000 claims abstract description 16
- 238000012216 screening Methods 0.000 claims abstract description 15
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 12
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 12
- 230000005496 eutectics Effects 0.000 claims abstract description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 16
- 239000002131 composite material Substances 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 10
- 238000005488 sandblasting Methods 0.000 claims description 10
- 239000011230 binding agent Substances 0.000 claims description 7
- 239000002270 dispersing agent Substances 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 229910001632 barium fluoride Inorganic materials 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 239000010431 corundum Substances 0.000 claims description 5
- 239000003350 kerosene Substances 0.000 claims description 5
- 238000003754 machining Methods 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000003208 petroleum Substances 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 5
- 230000003746 surface roughness Effects 0.000 claims description 5
- 238000000498 ball milling Methods 0.000 claims description 4
- 239000008367 deionised water Substances 0.000 claims description 4
- 229910021641 deionized water Inorganic materials 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 229920000084 Gum arabic Polymers 0.000 claims description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- 241000978776 Senegalia senegal Species 0.000 claims description 3
- 239000000205 acacia gum Substances 0.000 claims description 3
- 235000010489 acacia gum Nutrition 0.000 claims description 3
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 3
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 3
- 235000019422 polyvinyl alcohol Nutrition 0.000 claims description 2
- 238000007788 roughening Methods 0.000 claims description 2
- 238000004381 surface treatment Methods 0.000 claims description 2
- 238000009776 industrial production Methods 0.000 abstract description 2
- 238000005299 abrasion Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 229910001634 calcium fluoride Inorganic materials 0.000 description 3
- QDOXWKRWXJOMAK-UHFFFAOYSA-N chromium(III) oxide Inorganic materials O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000012946 outsourcing Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000943 NiAl Inorganic materials 0.000 description 1
- 229910003266 NiCo Inorganic materials 0.000 description 1
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 description 1
- 229910009043 WC-Co Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910001120 nichrome Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910003470 tongbaite Inorganic materials 0.000 description 1
Classifications
-
- 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
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
-
- 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
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- 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
-
- 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
- C23C4/073—Metallic material containing MCrAl or MCrAlY alloys, where M is nickel, cobalt or iron, with or without non-metal elements
-
- 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
- C23C4/18—After-treatment
Abstract
The invention provides a high-temperature wear-resistant self-lubricating coating and a preparation method thereof, wherein the coating contains MCrAlY and Al2O3And Ca (Ba) F2Eutectic powder, wherein M is one or more of Ni, Co and Ta; the weight percentage of each component is as follows: MCrAlY: 70-84% of Al2O3：8％～15％，Ca(Ba)F28 to 15 percent of eutectic powder; the MCrAlY/Al is prepared by the methods of powder screening, wet mixing, spray granulation and supersonic spraying2O3/Ca(Ba)F2High temperature abrasion resistant self-lubricating coating, process for producing the sameThe preparation method has simple and controllable process and is suitable for industrial production.
Description
Technical Field
The invention relates to the field of lubricating coatings, in particular to a high-temperature wear-resistant self-lubricating coating and a preparation method thereof.
Background
The brush type sealing technology is widely adopted in the design and manufacturing process of modern gas turbines, and plays an important role in increasing the stability of rotating parts of the gas turbines, reducing the oil consumption rate of the gas turbines and prolonging the service life of the gas turbines. The brush seal adopts interference fit, and the surface of a rotor shaft contacted with the brush seal is in a high-temperature friction and wear state for a long time, so that the surface of the brush seal is widely coated with a high-temperature wear-resistant coating to prolong the service life of the brush seal.
With the development of gas turbine technology, the internal gas temperature is greatly increased, the limit service temperature is close to 1000 ℃, and the phenomenon of friction, wear and failure at high temperature is very serious, so that the surface coating of the gas turbine is required to have high temperature resistance and wear resistance and certain solid lubricity. And the common WC-Co and NiCr-Cr3C2The limit service temperature can only reach 850 ℃, the requirement of actual service temperature is difficult to meet, and CoTaSiCrAlY + Al2O3Although the material can meet the requirements on temperature resistance, bonding strength and wear resistance, the material still has failure phenomenon in practical long-term practical application due to the lack of self-lubricating property.
The traditional wear-resistant self-lubricating coating must be provided with a binding phase (NiAl, NiCr, NiCo, NiCrAlY and the like), a wear-resistant phase (WC and Cr)3C2、Al2O3、Cr2O3Etc.), lubricating phases (graphite, MoS)2Ag, etc.), two main high-temperature wear-resistant self-lubricating materials NiCr-Cr are reported in China3C2-Ca(Ba)F2And NiCrAlY-Cr2O3Ag, the former binder phase and the wear phase being difficult to withstand an ambient temperature of 900 ℃ and Cr2O3Phase change exists, meanwhile, the melting point of silver is only 961 ℃, and the silver is volatilized and loses efficacy in the use process, so that the preparation technology of the high-temperature wear-resistant self-lubricating coating material which can be mature and applied at 900-1050 ℃ does not exist at present.
Disclosure of Invention
The technical task of the invention is to provide a high-temperature wear-resistant self-lubricating coating and a preparation method thereof aiming at the defects of the prior art, and the wear-resistant self-lubricating coating can be mature and applied within the range of 900-1050 ℃.
The technical scheme adopted by the invention for solving the technical problems is as follows: the high-temperature wear-resistant self-lubricating coating powder comprises the following components in percentage by mass: MCrAlY: 70-84% of Al2O3：8％～15％，Ca(Ba)F28 to 15 percent of eutectic powder; and M is one or more of Ni, Co and Ta.
Further, the Ca (Ba) F2CaF in eutectic powder2And BaF2The mass ratio is 1: 1.5-1: 2.5.
Further, the Ca (Ba) F2The eutectic powder is prepared by a melting, mixing and cooling method.
The method for preparing the high-temperature wear-resistant self-lubricating coating by adopting the coating material with the composition comprises the following steps:
(1) powder screening: crushing and screening the powder of each component, and controlling the granularity to be below 10 mu m;
(2) and (3) wet mixing: mixing the components according to mass percent to form composite powder, adding a binder and a dispersing agent, carrying out wet ball milling for 2-6 h, uniformly mixing, and preparing slurry suitable for spray granulation;
(3) spray granulation: spraying and granulating by using a centrifugal spraying granulator, controlling the inlet temperature to be 310-350 ℃, the outlet temperature to be 180-220 ℃, controlling the rotating speed of an atomizer to be 8000-12000 r/min, and recovering 160-400-mesh granulated powder;
(4) supersonic spraying: controlling the flow of oxygen to be 600-1100L/min, the flow of kerosene to be 0.3-0.5L/min, the flow of powder feeding nitrogen to be 9-15L/min, the powder feeding speed to be 10-50 g/min, the spraying distance to be 200-300 mm, the gun moving speed to be 300-1500 mm/s, the spraying speed to be 10-30 mu m/min and the total spraying thickness to be 300-500 mu m.
Further, in the step (2), the binder is one of sodium carboxymethyl cellulose, polyvinyl alcohol and gum arabic.
Further, the dispersant in the step (2) is ethanol or deionized water.
Further, the amount of the binder in the step (2) is 0-4% of the total mass of the composite powder.
Further, the dosage of the dispersing agent in the step (2) is 0.9-1.2 times of the total mass of the composite powder.
Further, before the step (4), the surface treatment of the sample piece to be sprayed is also included, and the treatment step includes:
oil removal treatment of the surface of the sample piece: cleaning the surface of the sample in petroleum ether for 1-3 min, and then cleaning with ethanol for 3-5 min;
roughening the surface of the sample piece: and carrying out sand blasting treatment on the surface of the sample piece, wherein the sand material is 20-40 meshes of brown corundum, and the sand blasting pressure is 0.3-0.7 MPa.
Further, the step (4) is followed by the steps of: and after the spraying is finished and the sample piece is cooled, performing surface finish machining, controlling the surface roughness within the range of 0.4-0.8 um, and controlling the removal amount of the machined coating within 10-50 mu m.
Compared with the prior art, the invention has the beneficial effects that:
1. preparation of MCrAlY/Al by supersonic spraying2O3/Ca(Ba)F2MCrAlY has excellent high temperature oxidation resistance, while Al is used as high temperature wear-resistant self-lubricating coating material2O3Has excellent high-temperature wear resistance and wear resistance, and Ca (Ba) F2The eutectic material has good high-temperature self-lubricating performance, and the composite coating has a wide application prospect in a gas turbine rotating part at 900-1050 ℃.
2. The MCrAlY/Al is prepared by simple powder screening, wet mixing, spray granulation and supersonic spraying technology2O3/Ca(Ba)F2The high-temperature wear-resistant self-lubricating coating has simple preparation process and low production cost, and is suitable for industrial production and application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
(1) Powder screening:
directly crushing and screening purchased superfine CoCrAlYTa (below 500 meshes) to the granularity of below 10 mu m; ca (Ba) F2Eutectic powder according to CaF2And BaF2Mixing according to the mass ratio of 1:2, preparing by adopting a melt mixing cooling method, and then crushing and screening a powder sampling machine to below 10 mu m; adopting outsourcing standard high-purity superfine Al2O3Powder (3N5) with particle size controlled below 10 μm;
(2) and (3) wet mixing:
the composite powder is mixed according to the following mass fractions: CoCrAlYTa: 75% of Al2O3：12％，Ca(Ba)F213% of eutectic powder; adding polyvinyl alcohol accounting for 1% of the total mass of the composite powder and deionized water which is equal to the total mass of the powder, carrying out wet ball milling for 3 hours, and uniformly mixing to prepare slurry suitable for spray granulation;
(3) spray granulation: a centrifugal spraying granulator is adopted for spray granulation, the inlet temperature is controlled to be 330 ℃, the outlet temperature is set to be 210 ℃, the rotating speed of an atomizer is controlled to be 9000r/min, and 160-400-mesh granulation powder is recycled;
(4) coating spraying:
a, sample surface oil removal treatment: cleaning the surface of the sample in petroleum ether for 3min, and then cleaning with ethanol for 3 min;
b, coarsening the surface of the sample: carrying out sand blasting treatment on the surface of the sample, wherein the sand material is 30-mesh brown corundum, and the sand blasting pressure is 0.3 MPa;
c, supersonic spraying: controlling the oxygen flow rate to be 900L/min, the kerosene flow rate to be 0.4L/min, the powder feeding nitrogen flow rate to be 10L/min, the powder feeding speed to be 20g/min, the spray distance to be 250mm, the gun moving speed to be 500mm/s, the spray coating speed to be 15 mu m/min and the total spray coating thickness to be 400 mu m;
and D, after the spraying is finished and the sample piece is cooled, performing surface finish machining, controlling the surface roughness to be 0.8um and controlling the removal amount of the machined coating to be 30 mu m.
Example 2
(1) Powder screening:
directly crushing and screening purchased superfine NiCrAlY to the granularity below 10 mu m; ca (Ba) F2Eutectic powder according to CaF2And BaF2Mixing according to the mass ratio of 1:1.5, preparing by adopting a melt mixing cooling method, and then crushing and screening a powder sampling machine to below 10 microns; adopting outsourcing standard high-purity superfine Al2O3Powder (3N5) with particle size controlled below 10 μm;
(2) and (3) wet mixing:
the composite powder is mixed according to the following mass fractions: NiCrAlY: 80% of Al2O3：10％，Ca(Ba)F210% of eutectic powder, gum arabic accounting for 4% of the total mass of the composite powder and deionized water accounting for 1.2 times of the total mass of the powder are added, and the mixture is subjected to wet ball milling for 5 hours and is uniformly mixed to prepare slurry suitable for spray granulation;
(3) spray granulation: adopting a centrifugal spraying granulator to carry out spray granulation, controlling the inlet temperature at 340 ℃, the outlet temperature at 180 ℃, controlling the rotation speed of an atomizer at 10000r/min, and recovering granulation powder of 160-400 meshes;
(4) coating spraying:
a, sample surface oil removal treatment: cleaning the surface of the sample in petroleum ether for 1min, and then cleaning with ethanol for 3 min;
b, coarsening the surface of the sample: carrying out sand blasting treatment on the surface of the sample, wherein the sand material is 20-mesh brown corundum, and the sand blasting pressure is 0.35 MPa;
c, supersonic spraying: controlling the oxygen flow to be 800L/min, the kerosene flow to be 0.35L/min, the powder feeding nitrogen flow to be 9L/min, the powder feeding speed to be 15g/min, the spray distance to be 220mm, the gun moving speed to be 400mm/s, the spray coating speed to be 12 mu m/min and the total spray coating thickness to be 350 mu m;
and D, after the spraying is finished and the sample piece is cooled, performing surface finish machining, controlling the surface roughness to be 0.4um and controlling the removal amount of the machined coating to be 40 mu m.
Example 3
(1) Powder screening:
directly crushing and screening purchased superfine NiCoCrAlYTa to the granularity of below 10 mu m; ca (Ba) F2Eutectic powder according to CaF2And BaF2Mixing according to the mass ratio of 1:2.2, preparing by adopting a melt mixing cooling method, and then crushing and screening a powder sampling machine to below 10 microns; adopting outsourcing standard high-purity superfine Al2O3The particle size of the powder (3N5) was controlled to 10 μm or less.
(2) And (3) wet mixing:
the composite powder is mixed according to the following mass fractions: NiCoCrAlYTa: 80% of Al2O3：12％，Ca(Ba)F28% of eutectic powder, sodium carboxymethylcellulose which accounts for 0.5% of the total mass of the composite powder and dispersant ethanol which is 0.9 times of the total mass of the powder are added, and the mixture is ball-milled for 2 hours by a wet method and uniformly mixed to prepare slurry suitable for spray granulation;
(3) spray granulation: spraying and granulating by using a centrifugal spraying granulator, controlling the inlet temperature to be 350 ℃, the outlet temperature to be 220 ℃, controlling the rotating speed of an atomizer to be 12000r/min, and recovering granulating powder of 160-400 meshes;
(4) coating spraying:
a, sample surface oil removal treatment: cleaning the surface of the sample in petroleum ether for 2min, and then cleaning with ethanol for 4 min;
b, coarsening the surface of the sample: carrying out sand blasting treatment on the surface of the sample, wherein the sand material is 40-mesh brown corundum, and the sand blasting pressure is 0.6 MPa;
c, supersonic spraying: controlling the oxygen flow to be 950L/min, the kerosene flow to be 0.5L/min, the powder feeding nitrogen flow to be 12L/min, the powder feeding speed to be 30g/min, the spray distance to be 280mm, the gun moving speed to be 800mm/s, the spray coating speed to be 25 mu m/min and the total spray coating thickness to be 450 mu m;
and D, after the spraying is finished and the sample piece is cooled, performing surface finish machining, controlling the surface roughness to be 0.8um and controlling the removal amount of the machined coating to be 50 mu m.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The high-temperature wear-resistant self-lubricating coating is characterized in that the coating powder comprises the following components in percentage by mass: MCrAlY: 70-84% of Al2O3：8％～15％，Ca(Ba)F28 to 15 percent of eutectic powder; and M is one or more of Ni, Co and Ta.
2. A high temperature self-lubricating coating as claimed in claim 1, wherein the ca (ba) F is2CaF in eutectic powder2And BaF2The mass ratio is 1: 1.5-1: 2.5.
3. A high temperature self-lubricating coating as claimed in claim 2, wherein ca (ba) F2The eutectic powder is prepared by a melting, mixing and cooling method.
4. The method for preparing the high-temperature wear-resistant self-lubricating coating according to claim 1, comprising the following steps:
(1) powder screening: crushing and screening the powder of each component, and controlling the granularity to be below 10 mu m;
(2) and (3) wet mixing: mixing the components according to mass percent to form composite powder, adding a binder and a dispersing agent, carrying out wet ball milling for 2-6 h, uniformly mixing, and preparing slurry suitable for spray granulation;
(3) spray granulation: spraying and granulating by using a centrifugal spraying granulator, controlling the inlet temperature to be 310-350 ℃, the outlet temperature to be 180-220 ℃, controlling the rotating speed of an atomizer to be 8000-12000 r/min, and recovering 160-400-mesh granulated powder;
(4) supersonic spraying: controlling the flow of oxygen to be 600-1100L/min, the flow of kerosene to be 0.3-0.5L/min, the flow of powder feeding nitrogen to be 9-15L/min, the powder feeding speed to be 10-50 g/min, the spraying distance to be 200-300 mm, the gun moving speed to be 300-1500 mm/s, the spraying speed to be 10-30 mu m/min and the total spraying thickness to be 300-500 mu m.
5. The method for preparing a high-temperature wear-resistant self-lubricating coating according to claim 4, wherein the binder in step (2) is one of sodium carboxymethyl cellulose, polyvinyl alcohol and gum arabic.
6. The method for preparing the high-temperature wear-resistant self-lubricating coating according to claim 4, wherein the dispersant in the step (2) is ethanol or deionized water.
7. The preparation method of the high-temperature wear-resistant self-lubricating coating according to claim 4, wherein the amount of the binder in the step (2) is 0-4% of the total mass of the composite powder.
8. The preparation method of the high-temperature wear-resistant self-lubricating coating according to claim 4, wherein the amount of the dispersant in the step (2) is 0.9-1.2 times of the total mass of the composite powder.
9. The method for preparing the high-temperature wear-resistant self-lubricating coating according to claim 4, wherein the step (4) is preceded by a surface treatment of a sample to be sprayed, and the treatment step comprises:
oil removal treatment of the surface of the sample piece: cleaning the surface of the sample in petroleum ether for 1-3 min, and then cleaning with ethanol for 3-5 min;
roughening the surface of the sample piece: and carrying out sand blasting treatment on the surface of the sample piece, wherein the sand material is 20-40 meshes of brown corundum, and the sand blasting pressure is 0.3-0.7 MPa.
10. The method for preparing the high-temperature wear-resistant self-lubricating coating according to claim 4, wherein the step (4) is followed by the following steps: and after the spraying is finished and the sample piece is cooled, performing surface finish machining, controlling the surface roughness within the range of 0.4-0.8 um, and controlling the removal amount of the machined coating within 10-50 mu m.
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