CN115522156A - Wide-temperature-range nickel-chromium carbide-based self-lubricating composite coating and preparation method thereof - Google Patents
Wide-temperature-range nickel-chromium carbide-based self-lubricating composite coating and preparation method thereof Download PDFInfo
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- 239000011248 coating agent Substances 0.000 title claims abstract description 71
- 238000000576 coating method Methods 0.000 title claims abstract description 71
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 229910018487 Ni—Cr Inorganic materials 0.000 title claims abstract description 47
- 239000002131 composite material Substances 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 238000005507 spraying Methods 0.000 claims abstract description 70
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 65
- 239000000843 powder Substances 0.000 claims abstract description 64
- 239000000758 substrate Substances 0.000 claims abstract description 49
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 25
- 238000004880 explosion Methods 0.000 claims abstract description 16
- 229910000601 superalloy Inorganic materials 0.000 claims abstract description 15
- 230000001050 lubricating effect Effects 0.000 claims abstract description 11
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims abstract description 8
- 239000011651 chromium Substances 0.000 claims abstract description 7
- 238000005516 engineering process Methods 0.000 claims abstract description 6
- 239000011159 matrix material Substances 0.000 claims abstract description 6
- 229910052709 silver Inorganic materials 0.000 claims abstract description 5
- 239000004332 silver Substances 0.000 claims abstract description 5
- 238000005488 sandblasting Methods 0.000 claims description 34
- 239000007789 gas Substances 0.000 claims description 24
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 16
- 238000004140 cleaning Methods 0.000 claims description 15
- 239000002994 raw material Substances 0.000 claims description 15
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 12
- 239000004576 sand Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 9
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 claims description 8
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 claims description 8
- 239000001294 propane Substances 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 238000000151 deposition Methods 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 238000007664 blowing Methods 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 6
- 239000000446 fuel Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 238000005498 polishing Methods 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 5
- 239000002360 explosive Substances 0.000 claims description 5
- 230000008021 deposition Effects 0.000 claims description 4
- 239000002737 fuel gas Substances 0.000 claims description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 4
- 229910001120 nichrome Inorganic materials 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 238000005054 agglomeration Methods 0.000 claims 1
- 230000002776 aggregation Effects 0.000 claims 1
- 238000005245 sintering Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 7
- 238000011049 filling Methods 0.000 description 4
- 229910016036 BaF 2 Inorganic materials 0.000 description 3
- 229910004261 CaF 2 Inorganic materials 0.000 description 3
- 244000137852 Petrea volubilis Species 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 238000005261 decarburization Methods 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 description 2
- FGCGALPUFOSDIE-UHFFFAOYSA-N chromium nickel Chemical compound [Cr][Ni][Cr] FGCGALPUFOSDIE-UHFFFAOYSA-N 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000010285 flame spraying Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000007751 thermal spraying Methods 0.000 description 2
- 229910003470 tongbaite Inorganic materials 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- MOFOBJHOKRNACT-UHFFFAOYSA-N nickel silver Chemical compound [Ni].[Ag] MOFOBJHOKRNACT-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000005501 phase interface Effects 0.000 description 1
- 238000007750 plasma spraying Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 230000003685 thermal hair damage Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Images
Classifications
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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
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/126—Detonation spraying
-
- 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
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
Abstract
The invention relates to a wide temperature range nickel-chromium carbide based self-lubricating composite coating, which adopts the explosion spraying technology to coat Ag powder/Ni with MoS 2 Powder and NiCr-Cr 3 C 2 The powder is deposited on a GH4169 nickel-based superalloy substrate to form a coating consisting of a matrix phase consisting of nickel-chromium carbide and a lubricating phase consisting of silver/nickel-coated molybdenum disulfide. Meanwhile, the invention also discloses a preparation method of the composite coating. The wide-temperature-range nickel-chromium carbide-based self-lubricating composite coating has high density, good bonding between the coating and a substrate interface, and good wear resistance and lubricating performance within the temperature range of 25-800 ℃.
Description
Technical Field
The invention relates to the technical field of material surface lubrication and protection, in particular to a wide-temperature-range nickel-chromium carbide-based self-lubricating composite coating and a preparation method thereof.
Background
The nickel-chromium carbide metal ceramic coating material is widely applied to surface protection of key parts in the fields of aviation industry, chemical energy, nuclear power and the like due to good performances of corrosion resistance, wear resistance, high temperature oxidation resistance and the like. However, the existing nickel-chromium carbide-based self-lubricating composite coating has the problems of serious decarburization of chromium carbide, weak phase-interface bonding, stress concentration and the like, and is difficult to meet the long-acting protection and lubrication of mechanical parts in severe working conditions such as wide temperature range conditions, high-low temperature alternation and the like. Therefore, the preparation of the nickel-chromium carbide self-lubricating composite coating with good mechanical and tribological properties in a wide temperature range on the surface of the metal part has important research significance and application value.
At present, in research on a nickel-chromium carbide self-lubricating composite coating and a preparation method thereof, patent CN110218962A discloses a wear-resistant self-lubricating nickel-chromium carbide metal ceramic composite coating and a preparation method thereof, the method utilizes a supersonic flame spraying technology to obtain a nickel-chromium carbide/molybdenum disulfide-coated self-lubricating composite coating which has good wear resistance and self-lubricating performance in a room temperature environment, but the tribological performance of the coating in a wide temperature range (25 to 800 ℃) is lack of systematic research.
The explosion spraying is a high-performance coating preparation technology which takes acetylene and propane or a mixed gas of the acetylene and the propane as fuel gas and oxygen as combustion-supporting gas, and uses the mixed gas to explode to generate detonation waves to heat and accelerate powder, so that the powder impacts a substrate at supersonic speed to realize deposition. In comparison with the conventional thermal spray coating preparation technique, the pulse type deposition process is used for the substrate and the spray powder materialThe thermal damage is small, and the problems of decarburization, decomposition, thermal stress concentration and the like of the nickel-chromium carbide powder caused by overhigh spraying temperature in the thermal spraying process can be effectively solved. Literature "three thermal spraying processes for preparing Ni-Cr-BaF 2 /CaF 2 The research in the structure and performance discovers that compared with supersonic flame spraying and atmospheric plasma spraying, the explosion spraying of the nickel chromium-chromium carbide-BaF 2 /CaF 2 The composite coating has compact structure, high bonding strength and high-temperature lubricant BaF 2 /CaF 2 The tribological performance of the composite coating in a high-temperature environment can be effectively improved, but the lubricating effect of the composite coating in room-temperature and medium-low-temperature environments is not obvious.
Disclosure of Invention
The invention aims to solve the technical problem of providing a wide-temperature-range nickel-chromium carbide-based self-lubricating composite coating.
The invention aims to solve another technical problem of providing a preparation method of the wide-temperature-range nickel-chromium carbide-based self-lubricating composite coating.
In order to solve the problems, the invention provides a wide temperature range nickel-chromium carbide base self-lubricating composite coating, which is characterized in that: the self-lubricating composite coating adopts an explosion spraying technology to coat Ag powder/Ni with MoS 2 Powder and NiCr-Cr 3 C 2 The powder is deposited on a GH4169 nickel-based superalloy substrate to form a coating consisting of a matrix phase consisting of nickel-chromium carbide and a lubricating phase consisting of silver/nickel-coated molybdenum disulfide.
The Ag powder is atomized Ag powder with the purity of more than or equal to 99.5% and the grain diameter of less than 50 mu m.
The Ni-coated MoS 2 The particle size of the powder was < 50 μm and the Ni content was 75 wt.%, moS 2 The content was 25 wt.%.
The NiCr-Cr 3 C 2 The powder is agglomerated and sintered to form powder with the particle size of 15-45 mu m and the content of NiCr of 25 wt%, and the Cr is 3 C 2 The content was 75 wt.%.
The preparation method of the wide-temperature-range nickel-chromium carbide-based self-lubricating composite coating comprises the following steps:
(1) Pretreatment of the surface of a GH4169 nickel-based superalloy substrate:
firstly, polishing by using 400-800-mesh SiC sand paper to remove an oxide layer and scratches on the surface of a GH4169 nickel-based superalloy substrate, and ultrasonically cleaning by using absolute ethyl alcohol and acetone solution to remove abrasive dust on the surface of the substrate; secondly, carrying out aluminum oxide sand blasting treatment on the surface of the substrate by using sand blasting equipment; blowing sand grains remained on the surface of the sand grains clean by using compressed air; finally, ultrasonically cleaning a substrate sample through absolute ethyl alcohol, and drying at 70-80 ℃ to obtain the material;
(2) Preparing a spraying powder raw material:
according to the weight percentage, 2 to 10 wt.% of Ag powder and 0 to 20 wt.% of Ni-coated MoS 2 Powder and the balance of NiCr-Cr 3 C 2 Mechanically and uniformly mixing the powder, and drying at 75 to 85 ℃ for 1 to 2 hours to obtain a spraying powder raw material;
(3) Preparing a nickel-chromium carbide base self-lubricating composite coating:
and (2) utilizing computer-controlled explosion spraying equipment to be matched with a six-axis manipulator, and depositing the spraying powder raw materials with different proportions on the surface of the GH4169 nickel-based high-temperature alloy substrate obtained in the step (1), wherein the deposition thickness is 150-400 mu m.
The sand blasting condition in the step (1) is that the sand blasting pressure is 0.40 to 0.65 MPa, the sand blasting angle is 20 to 80 degrees, the sand blasting distance is 40 to 70 mm, and the grain diameter of the alumina sand is 24 meshes.
The conditions of the explosion spraying in the step (3) are that fuel gas is mixed gas of acetylene and propane, oxygen is combustion-supporting gas, the volume of a gas gun is 40-60%, and the oxygen-fuel ratio is 1.02:1, the spraying frequency is 3 to 5 Hz, the spraying distance is 130 to 180 mm, the spraying angle is 90 degrees, and the spraying speed is 50 to 70 mm/s.
And (4) controlling a spray gun to carry out plane spraying by the six-axis manipulator in the step (3) in a bow-shaped path, wherein the step distance between adjacent spraying paths is 10-15 mm.
Compared with the prior art, the invention has the following advantages:
1. the invention utilizes the explosive spraying coating preparation technology to prepare the nickel-chromium carbide-based self-lubricating composite coating material which takes nickel-chromium carbide as a matrix and silver-nickel-coated molybdenum disulfide as a lubricating phase on the surface of the GH4169 nickel-based high-temperature alloy substrate, and utilizes the synergistic lubricating effect of the Ag and nickel-coated molybdenum disulfide solid lubricant to effectively improve the tribological performance of the nickel-chromium carbide substrate in a wide temperature range.
2. Compared with the existing nickel-chromium carbide-based self-lubricating composite coating, the silver and nickel-coated molybdenum disulfide solid lubricant in the nickel-chromium carbide-based self-lubricating composite coating has good interface combination with a coating substrate, and the coating structure is compact.
3. The coating is prepared by combining computer-controlled explosion spraying equipment with a six-axis manipulator, the coating spraying process is controllable, the equipment is simple and convenient to operate, the heat influence on the coating and a substrate is small, the high-temperature decarburization of a chromium carbide hard phase and the oxidation and decomposition of a lubricating phase in the preparation process of the coating can be effectively reduced, and the uniformity and controllability of the coating are good.
4. The wide-temperature-range nickel-chromium carbide-based self-lubricating composite coating has high density, good bonding between the coating and a substrate interface, and good wear resistance and lubricating performance within the temperature range of 25-800 ℃.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 shows the explosion spraying of Ni-Cr carbide-Ag-MoS according to the present invention 2 A Back Scattered Electron (BSE) diagram of the cross section of the self-lubricating composite coating.
FIG. 2 shows the Ni-Cr-C-Ag-MoS of the present invention 2 Coefficient of friction curve (left) and wear rate (right) of the coating over a wide temperature range.
Detailed Description
A wide-temp-range Ni-Cr carbide base self-lubricating composite coating is prepared through coating Ag powder/Ni in MoS by explosion spraying technique 2 Powder and NiCr-Cr 3 C 2 The powder is deposited on a GH4169 nickel-base superalloy substrate to form a high-hardness wear-resistant nickel-chromium carbide (NiCr-Cr) 3 C 2 ) Formed matrix phase, silver (Ag)/nickel-coated molybdenum disulfide (Ni-coated MoS) 2 ) A coating consisting of a structured lubricating phase.
Wherein: the Ag powder is atomized Ag powder with the purity more than or equal to 99.5 percent and the grain diameter less than 50 mu m.
Ni bag MoS 2 The particle size of the powder was < 50 μm with a Ni content of 75 wt.%, moS 2 The content was 25 wt.%.
NiCr-Cr 3 C 2 The powder is agglomerated and sintered to form powder with the particle size of 15-45 mu m and the content of NiCr of 25 wt%, and the Cr is 3 C 2 The content was 75 wt.%.
The preparation method of the wide temperature range nickel-chromium carbide base self-lubricating composite coating comprises the following steps:
(1) Pretreatment of the surface of a GH4169 nickel-based superalloy substrate:
firstly, polishing by using 400-800-mesh SiC sand paper to remove an oxide layer and scratches on the surface of a GH4169 nickel-based superalloy substrate, and ultrasonically cleaning by using absolute ethyl alcohol and acetone solution to remove abrasive dust on the surface of the substrate; secondly, carrying out aluminum oxide (with the particle size of 24 meshes) sand blasting treatment on the surface of the substrate by using sand blasting equipment, wherein the sand blasting pressure is 0.40-0.65 MPa, the sand blasting angle is 20-80 degrees, and the sand blasting distance is 40-70 mm; blowing sand grains remained on the surface of the sand grains clean by using compressed air; and finally, ultrasonically cleaning a substrate sample through absolute ethyl alcohol, and drying at 70-80 ℃ to obtain the material.
(2) Preparing a spraying powder raw material:
according to the weight percentage, 2 to 10 wt.% of Ag powder and 0 to 20 wt.% of Ni-packaged MoS 2 Powder and the balance of NiCr-Cr 3 C 2 And (3) mechanically mixing the powder uniformly, and drying at 75-85 ℃ for 1-2 h to obtain a spraying powder raw material.
(3) Preparing a nickel-chromium carbide base self-lubricating composite coating:
and (2) utilizing computer-controlled explosion spraying equipment to be matched with a six-axis manipulator, and depositing the spraying powder raw materials with different proportions on the surface of the GH4169 nickel-based high-temperature alloy substrate obtained in the step (1), wherein the deposition thickness is 150-400 mu m.
Wherein: the conditions of explosive spraying are that fuel gas is mixed gas of acetylene and propane, oxygen is combustion-supporting gas, the volume of a gas filling gun is 40-60%, and the oxygen-fuel ratio is 1.02:1, the spraying frequency is 3 to 5 Hz, the spraying distance is 130 to 180 mm, the spraying angle is 90 degrees, and the spraying speed is 50 to 70 mm/s.
And controlling a spray gun by a six-axis manipulator to perform plane spraying in a bow-shaped path, wherein the step distance of adjacent spraying paths is 10-15 mm.
Embodiment 1 a method for preparing a wide temperature range nickel-chromium carbide-based self-lubricating composite coating, comprising the following steps:
(1) Pretreatment of the surface of a GH4169 nickel-based superalloy substrate:
firstly, polishing by using 400-mesh SiC sand paper to remove an oxide layer and scratches on the surface of a GH4169 nickel-based high-temperature alloy substrate, and ultrasonically cleaning by using absolute ethyl alcohol and acetone solution to remove abrasive dust on the surface of the substrate; secondly, carrying out sand blasting treatment on the surface of the substrate by using sand blasting equipment, wherein the grain diameter of the sand blasting equipment is 24 meshes, the sand blasting pressure is 0.50 MPa, the sand blasting angle is 20-40 degrees, and the sand blasting distance is 40-50 mm; blowing sand grains remained on the surface of the sand grains clean by using compressed air; and finally, ultrasonically cleaning a substrate sample by absolute ethyl alcohol, and drying at 75 ℃ to obtain the product.
(2) Preparing a spraying powder raw material:
10 g of Ag powder and 90 g of NiCr-Cr 3 C 2 And (3) mechanically and uniformly mixing the powder, and drying at 80 ℃ for 2 h to obtain the spraying powder raw material.
(3) Preparing a nickel-chromium carbide based self-lubricating composite coating:
performing bow-shaped linear path plane spraying on the substrate material by using CCDS-2000 computer-controlled explosion spraying equipment and a six-axis manipulator in a matching way; the explosive spraying gas is mixed gas of acetylene and propane, the oxygen is combustion-supporting gas, the gas filling gun volume is 55%, the oxygen-fuel ratio is 1.02, the spraying frequency is 5 Hz, the spraying distance is 150 mm, the spraying angle is 90 degrees, the spraying moving speed is 50 mm/s, the spraying is repeated for 24 times, and the average thickness of the coating is about 400 mu m.
The coating is subjected to a wide temperature range friction and wear test on an HT-1000 friction and wear testing machine, the load is 5N, the rotating radius is 5 mm, the rotating speed is 360 r/min, the time is 60 min, and the friction couple is Al 2 O 3 The friction environments of the (phi 6 mm) ball are respectively 25 ℃, 200 ℃, 400 ℃, 600 ℃ and 800 ℃ of the atmospheric environment, and the wear rate of the coating is measured and calculated by a non-contact optical three-dimensional surface profilerThe results are shown in Table 1.
TABLE 1 test results
Embodiment 2a method for preparing a wide temperature range nickel-chromium carbide base self-lubricating composite coating, comprising the following steps:
(1) Pretreatment of the surface of a GH4169 nickel-based superalloy substrate:
firstly, polishing by using 400-mesh SiC abrasive paper to remove an oxide layer and scratches on the surface of a GH4169 nickel-based superalloy substrate, and ultrasonically cleaning by using absolute ethyl alcohol and acetone solution to remove abrasive dust on the surface of the substrate; secondly, carrying out sand blasting treatment on the surface of the substrate by using sand blasting equipment, wherein the grain diameter of the sand blasting equipment is 24 meshes, the sand blasting pressure is 0.60 MPa, the sand blasting angle is 45-60 degrees, and the sand blasting distance is 50-60 mm; then, compressed air is used for blowing and cleaning sand grains remained on the surface; and finally, ultrasonically cleaning a substrate sample by absolute ethyl alcohol, and drying at 75 ℃ to obtain the product.
(2) Preparing a spraying powder raw material:
5 g of Ag powder and 10 g of Ni-coated MoS 2 Powder and 85 g NiCr-Cr 3 C 2 And (3) mechanically and uniformly mixing the powder, and drying at 80 ℃ for 2 h to obtain the spraying powder raw material.
(3) Preparing a nickel-chromium carbide base self-lubricating composite coating:
performing bow-shaped linear path plane spraying on the substrate material by using CCDS-2000 computer-controlled explosion spraying equipment and a six-axis manipulator in a matching way; the explosive spraying gas is mixed gas of acetylene and propane, the oxygen is combustion-supporting gas, the gas filling gun volume is 48%, the oxygen-fuel ratio is 1.02, the spraying frequency is 5 Hz, the spraying distance is 150 mm, the spraying angle is 90 degrees, the spraying moving speed is 50 mm/s, the spraying is repeated for 30 times, and the average thickness of the coating is about 400 mu m.
The prepared nickel-chromium carbide-based self-lubricating composite coating has a compact structure, and the lubricating phase and the coating matrix interface are well combined and uniformly distributed.
The coating was subjected to a wide temperature range frictional wear test in a HT-1000 frictional wear tester, which was performed in the same manner as in example 1, and the results are shown in Table 2.
TABLE 2 test results
Embodiment 3 a method for preparing a wide temperature range nickel-chromium carbide based self-lubricating composite coating, comprising the steps of:
(1) Pretreatment of the surface of a GH4169 nickel-based superalloy substrate:
firstly, polishing by using 600-mesh SiC abrasive paper to remove an oxide layer and scratches on the surface of a GH4169 nickel-based superalloy substrate, and ultrasonically cleaning by using absolute ethyl alcohol and acetone solution to remove abrasive dust on the surface of the substrate; secondly, carrying out aluminum oxide (with the particle size of 24 meshes) sand blasting treatment on the surface of the substrate by using sand blasting equipment, wherein the sand blasting pressure is 0.60 MPa, the sand blasting angle is 50-70 degrees, and the sand blasting distance is 50-70 mm; then, compressed air is used for blowing and cleaning sand grains remained on the surface; and finally, ultrasonically cleaning a substrate sample by absolute ethyl alcohol, and drying at 75 ℃ to obtain the product.
(2) Preparing a spraying powder raw material:
10 g of Ag powder and 20 g of Ni-coated MoS 2 Powder and 70 g NiCr-Cr 3 C 2 And (3) mechanically and uniformly mixing the powder, and drying at 85 ℃ for 2 h to obtain the spraying powder raw material.
(3) Preparing a nickel-chromium carbide based self-lubricating composite coating:
performing bow-shaped linear path plane spraying on the substrate material by using CCDS-2000 computer-controlled explosion spraying equipment and a six-axis manipulator in a matching way; the explosion spraying gas is mixed gas of acetylene and propane, oxygen is combustion-supporting gas, the volume of a gas filling gun is 52%, the oxygen-fuel ratio is 1.02.
As shown in figure 1, the prepared nickel chromium-chromium carbide-Ag-MoS 2 The self-lubricating composite coating has compact structure and good interface combination with the substrate.
The coating was subjected to a wide temperature range frictional wear test in a HT-1000 frictional wear tester, which was performed in the same manner as in example 1, and the results are shown in Table 3.
TABLE 3 test results
Claims (8)
1. A wide temperature range nickel-chromium carbide base self-lubricating composite coating is characterized in that: the self-lubricating composite coating adopts the explosive spraying technology to coat Ag powder/Ni with MoS 2 Powder and NiCr-Cr 3 C 2 The powder is deposited on a GH4169 nickel-based superalloy substrate to form a coating consisting of a matrix phase consisting of nickel-chromium carbide and a lubricating phase consisting of silver/nickel-coated molybdenum disulfide.
2. The wide temperature range nickel-chromium carbide-based self-lubricating composite coating of claim 1, wherein: the Ag powder is atomized Ag powder with the purity of more than or equal to 99.5% and the grain diameter of less than 50 mu m.
3. The wide temperature range nickel-chromium carbide based self-lubricating composite coating of claim 1, characterized in that: the Ni-coated MoS 2 The particle size of the powder was < 50 μm and the Ni content was 75 wt.%, moS 2 The content was 25 wt.%.
4. The wide temperature range nickel-chromium carbide-based self-lubricating composite coating of claim 1, wherein: the NiCr-Cr 3 C 2 The powder is powder with the grain diameter of 15-45 mu m and the content of NiCr of 25 wt percent, and the powder is formed by agglomeration and sintering, and the Cr content is 3 C 2 The content was 75 wt.%.
5. The preparation method of the wide temperature range nickel-chromium carbide-based self-lubricating composite coating as claimed in claim 1, comprising the following steps:
(1) Pretreatment of the surface of a GH4169 nickel-based superalloy substrate:
firstly, polishing by using 400-800 mesh SiC abrasive paper to remove an oxide layer and scratches on the surface of a GH4169 nickel-based high-temperature alloy substrate, and ultrasonically cleaning by using absolute ethyl alcohol and acetone solution to remove abrasive dust on the surface of the substrate; secondly, carrying out aluminum oxide sand blasting treatment on the surface of the substrate by using sand blasting equipment; then, compressed air is used for blowing and cleaning sand grains remained on the surface; finally, ultrasonically cleaning a substrate sample through absolute ethyl alcohol, and drying at 70-80 ℃ to obtain the material;
(2) Preparing a spraying powder raw material:
according to the weight percentage, 2 to 10 wt.% of Ag powder and 0 to 20 wt.% of Ni-coated MoS 2 Powder and the balance of NiCr-Cr 3 C 2 Mechanically and uniformly mixing the powder, and drying at 75 to 85 ℃ for 1 to 2 hours to obtain a spraying powder raw material;
(3) Preparing a nickel-chromium carbide base self-lubricating composite coating:
and (2) utilizing computer-controlled explosion spraying equipment to be matched with a six-axis manipulator, and depositing the spraying powder raw materials with different proportions on the surface of the GH4169 nickel-based superalloy substrate obtained in the step (1), wherein the deposition thickness is 150-400 mu m.
6. The preparation method of the wide-temperature-range nickel-chromium carbide-based self-lubricating composite coating as claimed in claim 5, characterized in that: the sand blasting condition in the step (1) is that the sand blasting pressure is 0.40 to 0.65 MPa, the sand blasting angle is 20 to 80 degrees, the sand blasting distance is 40 to 70 mm, and the grain size of the alumina sand is 24 meshes.
7. The preparation method of the wide-temperature-range nickel-chromium carbide-based self-lubricating composite coating as claimed in claim 5, characterized in that: the conditions of the explosion spraying in the step (3) are that fuel gas is mixed gas of acetylene and propane, oxygen is combustion-supporting gas, the volume of a gas gun is 40-60%, and the oxygen-fuel ratio is 1.02:1, the spraying frequency is 3 to 5 Hz, the spraying distance is 130 to 180 mm, the spraying angle is 90 degrees, and the spraying speed is 50 to 70 mm/s.
8. The preparation method of the wide temperature range nickel-chromium carbide based self-lubricating composite coating according to claim 5, characterized in that: and (4) in the step (3), the six-axis mechanical arm controls the spray gun to carry out plane spraying in a bow-shaped path, and the step distance between adjacent spraying paths is 10 to 15 mm.
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