CN113073283A - Nickel-chromium/chromium carbide metal ceramic composite coating and preparation method thereof - Google Patents
Nickel-chromium/chromium carbide metal ceramic composite coating and preparation method thereof Download PDFInfo
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- 239000011248 coating agent Substances 0.000 title claims abstract description 64
- 238000000576 coating method Methods 0.000 title claims abstract description 64
- 229910003470 tongbaite Inorganic materials 0.000 title claims abstract description 52
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 239000002131 composite material Substances 0.000 title claims abstract description 38
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 229910018487 Ni—Cr Inorganic materials 0.000 title claims abstract description 31
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 28
- 239000002184 metal Substances 0.000 title claims abstract description 28
- 239000000919 ceramic Substances 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 58
- 239000000463 material Substances 0.000 claims abstract description 57
- 238000005488 sandblasting Methods 0.000 claims abstract description 25
- 238000005507 spraying Methods 0.000 claims abstract description 21
- 238000010285 flame spraying Methods 0.000 claims abstract description 18
- 229910001120 nichrome Inorganic materials 0.000 claims abstract description 18
- 239000011651 chromium Substances 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 14
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 12
- 239000011159 matrix material Substances 0.000 claims description 12
- 239000011195 cermet Substances 0.000 claims description 7
- 239000000446 fuel Substances 0.000 claims description 7
- 229910052786 argon Inorganic materials 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 229910052593 corundum Inorganic materials 0.000 claims description 6
- 239000010431 corundum Substances 0.000 claims description 6
- 239000003350 kerosene Substances 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 238000005054 agglomeration Methods 0.000 claims description 3
- 230000002776 aggregation Effects 0.000 claims description 3
- 238000000280 densification Methods 0.000 claims description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000005260 corrosion Methods 0.000 abstract description 16
- 230000007797 corrosion Effects 0.000 abstract description 11
- 238000005299 abrasion Methods 0.000 abstract description 4
- 238000001035 drying Methods 0.000 description 13
- 238000005498 polishing Methods 0.000 description 9
- 239000000758 substrate Substances 0.000 description 9
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 238000013021 overheating Methods 0.000 description 4
- 239000011780 sodium chloride Substances 0.000 description 4
- 230000003746 surface roughness Effects 0.000 description 4
- 238000007751 thermal spraying Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000012360 testing method Methods 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
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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
-
- 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
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/129—Flame spraying
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating By Spraying Or Casting (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
The invention provides a nickel-chromium/chromium carbide metal ceramic composite coating and a preparation method thereof, wherein the method comprises the following steps: step 1, pretreating the surface of a base material to obtain a base material with a smooth surface and no oxide skin; step 2, firstly carrying out sand blasting treatment on the base material obtained in the step 1, and then preheating to obtain a pretreated base material; step 3, using NiCr-Cr3C2Powder, supersonic flame spraying NiCr and Cr onto the base material obtained in step 23C2The mass ratio of the nickel chromium/chromium carbide metal ceramic composite coating to the base material is 1:3, the spraying distance is 380-400mm, the powder feeding speed is 100-120g/min, the nickel chromium/chromium carbide metal ceramic composite coating is formed on the base material, the density of the coating is high, the porosity is low, the bonding strength is high, and the corrosion and abrasion resistance is excellent.
Description
Technical Field
The invention belongs to the technical field of metal surface treatment, and particularly relates to a nickel-chromium/chromium carbide metal ceramic composite coating and a preparation method thereof.
Background
With the continuous progress of science and technology, engineering equipment plays a crucial role in human exploration of nature, and many parts of the engineering equipment work in corrosive media for a long time, are severely corroded and abraded, and cause large material loss.
The application of the thermal spraying technology in the fields of aerospace, petrochemical industry, ferrous metallurgy, automobile shipbuilding and the like is more and more extensive, and the thermal spraying technology is nickel chromium/chromium carbide (namely NiCr-Cr)3C2) The coating is mostly applied to equipment parts under severe working conditions because of good wear resistance, oxidation resistance and corrosion resistance, but with the development of the thermal spraying technology, a thermal spraying nickel-chromium/chromium carbide coating which has low wear rate and strong corrosion and wear resistance is needed.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the nickel-chromium/chromium carbide metal ceramic composite coating and the preparation method thereof, and the coating has the advantages of high density, low porosity, high bonding strength and excellent corrosion and abrasion resistance.
The invention is realized by the following technical scheme:
a preparation method of a nickel-chromium/chromium carbide metal ceramic composite coating comprises the following steps:
step 1, pretreating the surface of a base material to obtain a base material with a smooth surface and no oxide skin;
step 2, firstly carrying out sand blasting treatment on the base material obtained in the step 1, and then preheating to obtain a pretreated base material;
step 3, using NiCr-Cr3C2Powder, supersonic flame spraying NiCr and Cr onto the base material obtained in step 23C2The mass ratio of the nickel chromium/chromium carbide metal ceramic composite coating to the base material is 1:3, the spraying distance is 380-400mm, and the powder feeding speed is 100-120 g/min.
Preferably, in the step 2, oil stains on the surface of the base material obtained in the step 1 are removed, then 60-mesh white corundum is used for sand blasting treatment, the sand blasting pressure is 0.6-0.65MPa, and finally residual sand grains on the surface of the base material are blown off.
Further, after the sand blasting treatment in the step 2, the roughness of the surface of the obtained base material is more than 5 μm and less than 10 μm.
Preferably, the temperature for preheating in step 2 is 180-.
Preferably, the NiCr in step 3 is Ni (20 Cr).
Further, NiCr-Cr in step 33C2The particle size of the powder is 15-45 μm, and the powder making mode is agglomeration sintering and plasma densification.
Preferably, in the step 3, when the supersonic flame spraying is carried out, compressed air is blown to cool the base material, so that the temperature of the base material does not exceed 250 ℃.
Preferably, the thickness of the nickel-chromium/chromium carbide metal ceramic composite coating formed in the step 3 is 0.2-0.3 mm.
Preferably, the fuel in the step 3 is kerosene when the supersonic flame spraying is carried out, and the flow rate is controlled to be 20-26L/min; the combustion-supporting gas is industrial oxygen, and the flow rate is 700-; the powder feeding gas is industrial argon, and the flow rate is 7.2-9L/min.
A nickel chromium/chromium carbide cermet composite coating obtained by the preparation method of the nickel chromium/chromium carbide cermet composite coating.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the preparation method of the nickel-chromium/chromium carbide metal ceramic composite coating, the selected powder has good corrosion and wear resistance, NiCr can be used as a binder and can improve the corrosion resistance of the coating, and Cr is used as a metal oxide3C2Is a hard phase and has higher friction resistance. In addition, Cr3C2Is a typical ceramic phase with the function of increasing hardness and strength, NiCr is used as a binding phase, and Cr can be used3C2Better bonding together, further increasing the strength, thus the surface of the base material is firstly pretreated, sand-blasted and preheated to strengthen the base material and NiCr-Cr3C2The binding force of the powder is further passedThe optimization of the supersonic flame spraying distance and the powder feeding rate ensures that the coating can improve the corrosion and abrasion resistance of the coating, reduce the friction coefficient, reduce the friction heat generation and reduce the friction damage on the basis of keeping the original good performance, and the obtained coating has high density, low porosity and high bonding strength. The invention adopts NiCr-Cr3C2Powder, NiCr as adhesive and Cr as additive are prepared on the surface of base material by supersonic flame spraying3C2And the reinforcing phase realizes the improvement of the corrosion and abrasion resistance of the coating.
Furthermore, the flowability of the powder in supersonic flame spraying can be better ensured by selecting the powder particle size of 15-45 microns, so that a coating with excellent performance is obtained, and if the powder particle size is too small, overburning can be caused at high spraying temperature, and the powder is ablated in the spraying process; if the particle size of the powder is too large, the powder can block a gun and cannot be sufficiently heated, the comprehensive performance of the coating can be influenced, and the selected powder making mode can better ensure the powder fluidity in supersonic flame spraying, so that the phenomena of oxidation and decarburization of the raw materials are reduced as much as possible.
Drawings
FIG. 1 is an SEM image of a composite coating made in example 1 of the present invention;
FIG. 2a is a graph of the coefficient of friction of the composite coating prepared in example 1 of the present invention;
FIG. 2b is an electrochemical curve of a composite coating prepared in example 1 of the present invention under a corrosive wear test;
FIG. 3a is a graph of the coefficient of friction of the composite coating prepared in example 2 of the present invention;
FIG. 3b is an electrochemical curve of the composite coating prepared in example 2 of the present invention under a corrosive wear test.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The invention relates to a nickel chromium/chromium carbide (namely NiCr-Cr)3C2) Cermet composite coating, Ni (20Cr) (i.e. 80Ni-20Cr) as binder, NiCr of 25 percent by mass, chromium carbide (Cr)3C2) As hard phase, Cr3C2The mass percent of the active component is 75 percent, and the active component can be used in a corrosive medium for a long time.
NiCr-Cr3C2The powder is an existing product, the granularity is 15-45 mu m, and the powder making mode is agglomeration sintering and plasma densification.
The invention relates to a preparation method of a low-porosity and corrosion-wear-resistant nickel-chromium/chromium carbide metal ceramic composite coating, which comprises the following steps:
1) pretreatment of substrate surface
Firstly, polishing a base material by using a polishing machine, wherein the polishing machine is generally 316L, and the surface flatness of the base material is ensured while removing surface oxide skin;
then, ultrasonically cleaning by adopting alcohol to remove oil stains on the surface;
finally, carrying out sand blasting treatment by using 60-mesh white corundum, wherein the sand blasting pressure is 0.6-0.65Mpa, the surface is uniform after sand blasting, the surface roughness is more than 5 microns and less than 10 microns, and after sand blasting is finished, blowing off residual sand grains on the surface of the base material by using compressed air;
2) dried powder
The prepared NiCr-Cr3C2Putting the powder into a glass culture dish, and flattening the powder; will be loaded with NiCr-Cr3C2Putting the culture dish of the powder into a drying box, setting the drying temperature of the drying box to be 100-120 ℃ and the drying time to be 3-4h, and removing the excessive water in the powder.
3) Preparation of metal ceramic composite coating
Preheating a base material by using supersonic flame, wherein the preheating temperature is 180-220 ℃; and then spraying the powder treated in the step 2) on the surface of the preheated base material by adopting supersonic flame spraying equipment, namely a K2 spray gun system, wherein the temperature can reach 3000 ℃, and the thickness of the prepared coating is 0.2-0.3 mm.
In the spraying process, in order to prevent the matrix from being deformed due to overheating, compressed air is blown to cool the base material, and the temperature of the matrix is ensured not to exceed 250 ℃;
the supersonic flame spraying parameters are as follows: the fuel during spraying is kerosene, and the flow rate is controlled to be 20-26L/min; the combustion-supporting gas is industrial oxygen, and the flow rate is 700-; the powder feeding gas is industrial argon, the flow is 7.2-9L/min, the spraying distance is 380-400mm, and the powder feeding speed is 100-120 g/min.
The present invention is described in further detail below with reference to examples:
example 1
The preparation method of the low-porosity and corrosion-wear-resistant nickel-chromium/chromium carbide metal ceramic composite coating comprises the following steps:
1) pretreatment of substrate surface
Firstly, polishing a base material 316L by using a polishing machine, and removing surface oxide skin while ensuring the surface flatness of the base material; then, ultrasonically cleaning by adopting alcohol to remove oil stains on the surface; finally, carrying out sand blasting treatment by using 60-mesh white corundum, wherein the sand blasting pressure is 0.6Mpa, the surface is uniform after sand blasting, the surface roughness is 8 mu m, and after the sand blasting is finished, blowing off residual sand grains on the surface of the base material by using compressed air;
2) dried powder
The prepared NiCr-Cr3C2Putting the powder into a glass culture dish, flattening the powder, putting the powder into a drying box, setting the drying temperature of the drying box at 110 ℃ for 4 hours, and removing excessive water in the powder.
3) Preparation of metal ceramic composite coating
Preheating a base material by using supersonic flame, wherein the preheating temperature is 200 ℃; and then spraying the powder treated in the step 2) on the surface of the base material obtained in the step 1) by adopting supersonic flame spraying equipment to obtain the coating with the thickness of 0.3 mm.
In the spraying process, in order to prevent the matrix from being deformed due to overheating, compressed air is blown to cool the base material, and the temperature of the matrix is ensured not to exceed 250 ℃; the supersonic flame spraying parameters are as follows: the fuel during spraying is kerosene, and the flow rate is controlled to be 26L/min; the combustion-supporting gas is industrial oxygen, and the flow rate is 900L/min; the powder feeding gas is industrial argon, the flow is 9L/min, the spraying distance is 380mm, and the powder feeding speed is 100 g/min.
From FIG. 1 canIt is seen that NiCr/Cr3C2The coating is uniformly distributed and tightly combined, the thickness of the coating is 280 mu m, black is an auxiliary material in the test, and the porosity is low. And performing corresponding performance tests on the coating to obtain: the micro Vickers hardness is 1030.2HV0.3。
FIG. 2a shows NiCr/Cr3C2The stable friction factor of the coating in NaCl solution with the mass fraction of 3.5 percent is 0.34, the stable friction factor of the base material is 0.59, and NiCr/Cr3C2The coating is reduced by 42.4% compared to the substrate 316L. The curves in FIG. 2b were all obtained in 3.5% NaCl solution, and NiCr/Cr can be seen3C2Corrosion current density of the coating compared to-5.373A/cm of the substrate2The concentration is reduced to-5.682A/cm2Thus NiCr/Cr3C2The corrosion current density of the coating is reduced by 5.75 percent compared with that of 316L, the self-corrosion potential is-0.153V, and the self-corrosion potential is increased by 60.4 percent compared with that of the substrate of-0.386V.
Example 2
The preparation method of the low-porosity and corrosion-wear-resistant nickel-chromium/chromium carbide metal ceramic composite coating comprises the following steps:
1) pretreatment of substrate surface
Firstly, polishing a base material 316L by using a polishing machine, and removing surface oxide skin while ensuring the surface flatness of the base material; then, ultrasonically cleaning by adopting alcohol to remove oil stains on the surface; finally, carrying out sand blasting treatment by using 60-mesh white corundum, wherein the sand blasting pressure is 0.6Mpa, the surface is uniform after sand blasting, the surface roughness is 8 mu m, and after the sand blasting is finished, blowing off residual sand grains on the surface of the base material by using compressed air;
2) dried powder
The prepared NiCr-Cr3C2Putting the powder into a glass culture dish, flattening the powder, putting the powder into a drying box, setting the drying temperature of the drying box at 100 ℃ for 4 hours, and removing excessive water in the powder.
3) Preparation of metal ceramic composite coating
Preheating a base material by using supersonic flame, wherein the preheating temperature is 180 ℃; and then spraying the powder treated in the step 2) on the surface of the base material obtained in the step 1) by adopting supersonic flame spraying equipment to obtain the coating with the thickness of 0.2 mm.
In the spraying process, in order to prevent the matrix from being deformed due to overheating, compressed air is blown to cool the base material, and the temperature of the matrix is ensured not to exceed 250 ℃; the supersonic flame spraying parameters are as follows: the fuel during spraying is kerosene, and the flow rate is controlled to be 26L/min; the combustion-supporting gas is industrial oxygen, and the flow rate is 900L/min; the powder feeding gas is industrial argon, the flow is 9L/min, the spraying distance is 380mm, and the powder feeding speed is 100 g/min.
NiCr/Cr3C2The micro Vickers hardness of the coating is 1030.2HV0.3. As can be seen from FIG. 3a, the stable friction factor in the NaCl solution of artificial seawater is 0.27, the matrix is 0.49, and NiCr/Cr3C2The coating is reduced by 44.9% compared with the substrate 316L; the curves of FIG. 3b were all obtained in 3.5% NaCl solution, and NiCr/Cr can be seen3C2The corrosion current density of the coating is-5.412A/cm2The matrix is-5.161A/cm2Thus NiCr/Cr3C2The corrosion current density of the coating is reduced by 4.86 percent compared with that of 316L, the self-corrosion potential is-0.191V, and the self-corrosion potential is increased by 39.7 percent compared with that of the substrate of-0.370V.
Example 3
The preparation method of the low-porosity and corrosion-wear-resistant nickel-chromium/chromium carbide metal ceramic composite coating comprises the following steps:
1) pretreatment of substrate surface
Firstly, polishing a base material 316L by using a polishing machine, and removing surface oxide skin while ensuring the surface flatness of the base material; then, ultrasonically cleaning by adopting alcohol to remove oil stains on the surface; finally, carrying out sand blasting treatment by using 60-mesh white corundum, wherein the sand blasting pressure is 0.65Mpa, the surface is uniform after sand blasting, the surface roughness is 8 mu m, and after the sand blasting is finished, blowing off residual sand grains on the surface of the base material by using compressed air;
2) dried powder
The prepared NiCr-Cr3C2Putting the powder into a glass culture dish, flattening the powder, putting the powder into a drying oven, setting the drying temperature of the drying oven at 100 ℃ for 4 hours,excess water was removed from the powder.
3) Preparation of metal ceramic composite coating
Preheating a base material by using supersonic flame, wherein the preheating temperature is 220 ℃; and then spraying the powder treated in the step 2) on the surface of the base material obtained in the step 1) by adopting supersonic flame spraying equipment to obtain the coating with the thickness of 0.2 mm.
In the spraying process, in order to prevent the matrix from being deformed due to overheating, compressed air is blown to cool the base material, and the temperature of the matrix is ensured not to exceed 250 ℃; the supersonic flame spraying parameters are as follows: the fuel during spraying is kerosene, and the flow rate is controlled to be 20L/min; the combustion-supporting gas is industrial oxygen, and the flow rate is 700L/min; the powder feeding gas is industrial argon, the flow is 7.2L/min, the spraying distance is 400mm, and the powder feeding speed is 120 g/min.
Claims (10)
1. A preparation method of a nickel-chromium/chromium carbide metal ceramic composite coating is characterized by comprising the following steps:
step 1, pretreating the surface of a base material to obtain a base material with a smooth surface and no oxide skin;
step 2, firstly carrying out sand blasting treatment on the base material obtained in the step 1, and then preheating to obtain a pretreated base material;
step 3, using NiCr-Cr3C2Powder, supersonic flame spraying NiCr and Cr onto the base material obtained in step 23C2The mass ratio of the nickel chromium/chromium carbide metal ceramic composite coating to the base material is 1:3, the spraying distance is 380-400mm, and the powder feeding speed is 100-120 g/min.
2. The method for preparing the nickel-chromium/chromium carbide metal ceramic composite coating according to claim 1, wherein in the step 2, oil stains on the surface of the base material obtained in the step 1 are removed, then 60-mesh white corundum is used for sand blasting treatment, the sand blasting pressure is 0.6-0.65MPa, and finally residual sand grains on the surface of the base material are blown off.
3. The method for preparing the nickel chromium/chromium carbide metal ceramic composite coating according to claim 2, wherein after the sand blasting treatment in the step 2, the roughness of the surface of the obtained base material is more than 5 μm and less than 10 μm.
4. The method for preparing the nickel chromium/chromium carbide metal ceramic composite coating according to claim 1, wherein the preheating temperature in the step 2 is 180-220 ℃.
5. The method of claim 1, wherein the NiCr in step 3 is Ni (20 Cr).
6. The method of claim 5, wherein in step 3, NiCr-Cr is added3C2The particle size of the powder is 15-45 μm, and the powder making mode is agglomeration sintering and plasma densification.
7. The method for preparing the nickel chromium/chromium carbide metal ceramic composite coating according to claim 1, wherein in the step 3, the matrix material is cooled by blowing compressed air while the supersonic flame spraying is carried out, so that the temperature of the matrix material is not more than 250 ℃.
8. The method of preparing a nickel chromium/chromium carbide cermet composite coating according to claim 1 wherein the thickness of the nickel chromium/chromium carbide cermet composite coating formed in step 3 is 0.2-0.3 mm.
9. The method for preparing the nickel chromium/chromium carbide metal ceramic composite coating according to claim 1, wherein the fuel in the step 3 is kerosene when the fuel is sprayed by supersonic flame, and the flow rate is controlled to be 20-26L/min; the combustion-supporting gas is industrial oxygen, and the flow rate is 700-; the powder feeding gas is industrial argon, and the flow rate is 7.2-9L/min.
10. A nickel chromium/chromium carbide cermet composite coating obtainable by the process for preparing a nickel chromium/chromium carbide cermet composite coating according to any one of claims 1-9.
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Cited By (1)
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| CN113652623A (en) * | 2021-07-07 | 2021-11-16 | 北京金宇顺达科技股份有限公司 | Composite material of titanium alloy and preparation method thereof |
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