CN111020453A - Method for obtaining independent atmospheric plasma spraying coating - Google Patents

Method for obtaining independent atmospheric plasma spraying coating Download PDF

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Publication number
CN111020453A
CN111020453A CN201911270103.9A CN201911270103A CN111020453A CN 111020453 A CN111020453 A CN 111020453A CN 201911270103 A CN201911270103 A CN 201911270103A CN 111020453 A CN111020453 A CN 111020453A
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coating
stainless steel
steel substrate
layer
target coating
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CN201911270103.9A
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Chinese (zh)
Inventor
王昕�
李启
胡静
江绍亮
谢建良
邓龙江
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University of Electronic Science and Technology of China
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University of Electronic Science and Technology of China
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Priority to CN201911270103.9A priority Critical patent/CN111020453A/en
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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
    • C23C4/134—Plasma 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
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating 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
    • 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
    • C23C4/04—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
    • C23C4/11—Oxides
    • 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
    • C23C4/185—Separation of the coating from the substrate

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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)

Abstract

The invention belongs to the field of spraying application, and particularly relates to a method for obtaining an independent atmospheric plasma spraying coating. The raw materials required by the invention are economical and easy to obtain. According to the invention, the stainless steel substrate is adopted, and NaCl with high solubility in deionized water is added between the target coating and the stainless steel substrate as a dissolving layer, so that the target coating can be separated from the stainless steel substrate in a short time after being placed in the deionized water, the appearance is kept complete, and the appearance, the performance and the internal structure of the coating cannot be influenced in the process of removing the coating substrate. The shape of the stainless steel substrate used in the invention is not affected by NaCl dissolved in deionized water, so that the coated substrate can be reused, and the resource waste is reduced.

Description

Method for obtaining independent atmospheric plasma spraying coating
Technical Field
The invention belongs to the field of spraying application, and particularly relates to a method for obtaining an independent atmospheric plasma spraying coating.
Background
With the rapid development of radio technology and radar detection technology, radar stealth technology in the military field has also been rapidly developed. At present, radar stealth is mainly realized at home and abroad by two means: (1) the radar wave-absorbing material is added to perform loss absorption on the electromagnetic waves; (2) the Radar cross-section RCS (Radar cross-section) of the weapon is reduced by the stealth design of the appearance of the weapon. The design of the aircraft stealth coating is a research difficulty at present for the design of a high-temperature radar coating in an engine tail spray pipe besides common components. Under normal working conditions, the local temperature in the tail spray pipe can reach 500 ℃ or even 1000 ℃. Because of the influence of high-temperature airflow scouring, the research on radar wave absorption by using structural materials has the harsh dual requirements on mechanical property and stability, and is difficult to put into use in a short period. The coating thickness can be effectively reduced by using the coating added with the magnetic wave absorbing agent.
The application of thermally sprayed ceramic wave-absorbing coatings is a widely studied and used method for reducing radar signals. When the dielectric properties of the coating are studied using this method, the coating must be separated from the substrate, and thus a method of separating the sprayed coating has emerged. The traditional method of stripping the sprayed coating is to spray the target coating onto a graphite substrate and then separate it by mechanical stripping. This approach requires thicker target coatings, which directly affects the utility for aircraft stealth coatings. The thickness of the wave-absorbing coating of the currently designed aircraft is about 500 mu m, and the coating area is larger. The method is influenced by the mechanical property of the coating, the coating is easy to damage when being stripped by the traditional method, the graphite cannot be completely removed, and the influence on the accuracy of the subsequent performance test is inevitable.
Disclosure of Invention
Aiming at the problems or the defects, the method aims to realize the requirements of complete shape of the low-thickness target coating without damaging the surface appearance and the internal structure. The present invention provides a method for obtaining a stand-alone atmospheric plasma sprayed coating, which is a method based on a high solubility of the NaCl coating in deionized water for stripping the coating.
In order to realize the purpose of the invention, the following technical scheme is adopted:
step 1, preparing materials:
processing analytically pure NaCl powder to obtain powder with particle size smaller than 63 μm suitable for thermal spraying technology; and preparing a target coating powder suitable for use in thermal spray techniques.
Step 2, coating preparation:
after sanding the stainless steel substrate, firstly, spraying the NaCl powder prepared in the step 1 on the bonding layer by using an atmospheric plasma spraying integrated system to prepare a dissolving layer.
Finally, the target coating to be separated is sprayed on the dissolved layer.
Step 3, separating the target coating:
and (3) completely putting the integral coating structure prepared in the step (2) into deionized water, and after the target coating is automatically separated from the stainless steel substrate, cleaning the target coating separated from the substrate by using the deionized water to remove residual NaCl on the target coating, thus obtaining the complete target coating.
Furthermore, when the coating is prepared in the step 2, a bonding layer is also prepared between the dissolution layer and the stainless steel substrate and is used for increasing the bonding strength between the dissolution layer and the stainless steel substrate.
Furthermore, the bonding layer is a NiCrAlY layer and is sprayed on the sand-blasting side of the stainless steel substrate by utilizing an atmosphere plasma spraying integrated system.
Compared with the prior art, the invention has the advantages that
1. The raw materials required by the invention are economical and easy to obtain. The powder used in the invention is commercial 45 mu m NiCrAlY powder and analytically pure NaCl powder. The NiCrAlY bonding layer has the function of enhancing the combination between the NaCl dissolving layer and the stainless steel substrate and preventing the NaCl dissolving layer from falling off in the process of spraying a target coating. The NiCrAlY coating is not completely required and can be replaced with other transition layer materials.
2. According to the invention, NaCl is used as a dissolving layer, and the solubility in deionized water is very high, so that the target coating can be separated from the stainless steel substrate in a short time when being placed in the deionized water, the appearance is kept complete, and the appearance, the performance and the internal structure of the coating cannot be influenced in the process of removing the coating substrate.
3. The coated substrate used in the present invention can be recycled. After NaCl is dissolved in deionized water, the substrate appearance is not influenced by the NaCl, so that the coating substrate can be repeatedly utilized, and the resource waste is reduced.
In summary, the invention adopts the stainless steel substrate, and the NaCl with high solubility in the deionized water is added between the target coating and the stainless steel substrate as the dissolution layer, so that the target coating can be separated from the stainless steel substrate in a short time when being placed in the deionized water, the appearance is kept complete, and the appearance, the performance and the internal structure of the coating cannot be influenced in the process of removing the coating substrate. The shape of the stainless steel substrate used in the invention is not affected by NaCl dissolved in deionized water, so that the coated substrate can be reused, and the resource waste is reduced.
Drawings
FIG. 1 shows CaO-B obtained in example 1 of the present invention2O3-SiO2(CBS) SEM topography of the microcrystalline glass spray powder;
FIG. 2 shows CaO-B obtained in example 1 of the present invention2O3-SiO2(CBS) SEM topography of microcrystalline glass coatings;
FIG. 3 shows CaO-B separated in example 1 of the present invention2O3-SiO2(CBS) camera photographs of the microcrystalline glass coating;
FIG. 4 shows CaO-B peeled in example 1 of the present invention2O3-SiO2(CBS) microcrystalline glass coating and non-peeled CaO-B2O3-SiO2(CBS) comparative plot of XRD of microcrystalline glass coating;
FIG. 5 shows Fe/Al exfoliation in example 2 of the present invention2O3Camera photographs of the coating and the 316 stainless steel substrate after stripping.
Detailed Description
Example 1
Step 1, preparing materials:
analytically pure NaCl powder was baked in an oven at 120 ℃ for 1 hour, then mixed with zirconia balls of 4 times the mass thereof, and ball-milled using a planetary ball mill for 30 minutes. The resulting powder was sieved using a 63 μm sieve. And (4) putting the finally obtained NaCl original powder into a drying box for storage.
The NiCrAlY powder is commercial 45 mu m NiCrAlY powder.
1500g of CaO-B are taken2O3-SiO2(CBS) microcrystalline glass raw powder, 30g of PEI binder, 12g of ammonium citrate defoamer and 7500g of zirconia balls (5mm and 10mm zirconia balls mixed in a mass ratio of 1: 1) were added, and 1875g of deionized water was added. Mixing and ball milling are carried out for 24 hours, after the slurry is uniformly mixed, the target coating spraying powder with the diameter of between 30 and 80 mu m is obtained through spray granulation.
Step 2, coating preparation:
after sanding the stainless steel substrate, firstly spraying the stainless steel substrate sanding side with the NiCrAlY powder prepared in the step 1 by using an atmosphere plasma spraying integrated system to prepare a bonding layer.
And then spraying the NaCl powder prepared in the step 1 on the bonding layer by using an atmosphere plasma spraying integrated system to prepare a dissolving layer.
The specific process parameters for spraying are shown in table 1.
Power of Distance of spraying Thickness of coating Argon flow rate Flow rate of nitrogen Flow rate of hydrogen
Layer of NiCrAlY 65kW 120mm 50μm 200SCFH 80SCFH 60SCFH
NaCl layer 65kW 100mm 6μm 160SCFH 80SCFH 60SCFH
TABLE 1
And finally, spraying a target coating needing to be separated on the dissolved layer, and carrying out atmospheric plasma spraying on the CBS coating, wherein the specific parameters are shown in the table 2, and the size of the coating is 50mm multiplied by 50 mm.
Power of Distance of spraying Thickness of coating Argon flow rate Flow rate of nitrogen Flow rate of hydrogen
CBS coatings 55kW 100mm 400μm 200SCFH 80SCFH 60SCFH
TABLE 2
Step 3, separating the target coating:
and (3) completely putting the integral coating structure prepared in the step (2) into deionized water, and after the target coating is automatically separated from the substrate, cleaning the target coating separated from the substrate by using the deionized water to remove residual NaCl on the target coating, thus obtaining the complete target coating.
CaO-B used in the example2O3-SiO2The SEM morphology of the (CBS) microcrystalline glass spray powder is shown in FIG. 1.
CaO-B used in the example2O3-SiO2The SEM appearance of the (CBS) microcrystalline glass coating is shown in FIG. 2, and it can be seen that the target coating obtained in the present example has a completely molten area and a partAnd the molten area conforms to the basic characteristics of the coating prepared by thermal spraying.
CaO-B used in the example2O3-SiO2A camera photograph of the (CBS) glass ceramic coating is shown in fig. 3, and it can be seen that the resulting target coating is complete and of a thickness that meets aircraft coating design requirements.
Stripped CaO-B used in this example2O3-SiO2(CBS) microcrystalline glass coating and non-peeled CaO-B2O3-SiO2A comparison of the XRD of the (CBS) glass ceramic coating is shown in fig. 4, where it can be seen that there is no difference between the two, i.e. no change in the internal structure is observed.
Example 2
Step 1, preparing materials:
analytically pure NaCl powder was baked in an oven at 120 ℃ for 1 hour, then mixed with zirconia balls of 4 times the mass thereof, and ball-milled using a planetary ball mill for 30 minutes. The resulting powder was sieved using a 63 μm sieve. And (4) putting the finally obtained NaCl original powder into a drying box for storage.
Taking 400g of iron powder and 600gAl2O3Mechanically mixing the powders to obtain Fe/Al2O3And mixing the powders.
The NiCrAlY powder is commercial 45 mu m NiCrAlY powder.
Step 2, coating preparation:
after sanding the stainless steel substrate, firstly spraying the stainless steel substrate sanding side with the NiCrAlY powder prepared in the step 1 by using an atmosphere plasma spraying integrated system to prepare a bonding layer.
And then spraying the NaCl powder prepared in the step 1 on the bonding layer by using an atmosphere plasma spraying integrated system to prepare a dissolving layer.
The specific process parameters are shown in Table 3:
power of Distance of spraying Thickness of coating Argon flow rate Flow rate of nitrogen Flow rate of hydrogen
Layer of NiCrAlY 65kW 120mm 50μm 200SCFH 80SCFH 60SCFH
NaCl layer 65kW 100mm 6μm 160SCFH 80SCFH 60SCFH
TABLE 3
Using the Fe/Al prepared in step 12O3The mixed powder was subjected to atmospheric plasma spraying, the specific parameters of which are shown in Table 4, and the coating was in the form of a disk having a diameter of 20 mm.
Power of Distance of spraying Thickness of coating Argon flow rate Flow rate of nitrogen Flow rate of hydrogen
Coating layer 65kW 100mm 250μm 160SCFH 80SCFH 60SCFH
TABLE 4
Step 3, separating the target coating:
and (3) completely putting the integral coating structure prepared in the step (2) into deionized water, and after the target coating is automatically separated from the substrate, cleaning the target coating separated from the substrate by using the deionized water to remove residual NaCl on the target coating, thus obtaining the complete target coating.
Exfoliated Fe/Al as used in this example2O3A camera photograph of the coating and 316 stainless steel substrate is shown in fig. 5, and it can be seen that the coating completely peeled off the substrate and that both the coating and the substrate remained intact.

Claims (3)

1. A method of obtaining a self-contained atmospheric plasma spray coating comprising the steps of:
step 1, preparing materials:
processing analytically pure NaCl powder to obtain powder with particle size smaller than 63 μm suitable for thermal spraying technology; and preparing a target coating powder suitable for thermal spray techniques;
step 2, coating preparation:
after sanding the stainless steel substrate, spraying the NaCl powder prepared in the step (1) on the bonding layer by using an atmospheric plasma spraying integrated system to prepare a dissolving layer;
finally, the target coating to be separated is sprayed on the dissolved layer.
Step 3, separating the target coating:
and (3) completely putting the integral coating structure prepared in the step (2) into deionized water, and after the target coating is automatically separated from the substrate, cleaning the target coating separated from the stainless steel substrate by using the deionized water to remove residual NaCl on the target coating, thus obtaining the complete target coating.
2. A method of obtaining a self-contained atmospheric plasma spray coating as claimed in claim 1, wherein: and 2, during the coating preparation in the step 2, a bonding layer is also prepared between the dissolution layer and the stainless steel substrate and is used for increasing the bonding strength between the dissolution layer and the stainless steel substrate.
3. A method of obtaining a self-contained atmospheric plasma spray coating as claimed in claim 1, wherein: the bonding layer is a NiCrAlY layer and is sprayed on the sand-blasting side of the stainless steel substrate by utilizing an atmosphere plasma spraying integrated system.
CN201911270103.9A 2019-12-12 2019-12-12 Method for obtaining independent atmospheric plasma spraying coating Pending CN111020453A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112095067A (en) * 2020-08-25 2020-12-18 电子科技大学 Preparation method of high-temperature-resistant infrared low-emissivity coating

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02159357A (en) * 1988-12-14 1990-06-19 Ishikawajima Harima Heavy Ind Co Ltd Production of shaped product by thermal spraying
US6134785A (en) * 1992-05-18 2000-10-24 The Boeing Company Method of fabricating an article of manufacture such as a heat exchanger
US20050100665A1 (en) * 2003-11-06 2005-05-12 General Electric Company Method for applying an optical coating to a surface of an article
CN1759201A (en) * 2003-03-07 2006-04-12 于利奇研究中心有限公司 Method for producing a layer system comprising a metallic carrier and an anode functional layer
CN105158828A (en) * 2015-09-02 2015-12-16 中国科学院长春光学精密机械与物理研究所 Free conformal method of infrared-band optical film
CN106943189A (en) * 2017-02-21 2017-07-14 上海理工大学 Target knife knife face adhesion preventing method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02159357A (en) * 1988-12-14 1990-06-19 Ishikawajima Harima Heavy Ind Co Ltd Production of shaped product by thermal spraying
US6134785A (en) * 1992-05-18 2000-10-24 The Boeing Company Method of fabricating an article of manufacture such as a heat exchanger
CN1759201A (en) * 2003-03-07 2006-04-12 于利奇研究中心有限公司 Method for producing a layer system comprising a metallic carrier and an anode functional layer
US20050100665A1 (en) * 2003-11-06 2005-05-12 General Electric Company Method for applying an optical coating to a surface of an article
CN105158828A (en) * 2015-09-02 2015-12-16 中国科学院长春光学精密机械与物理研究所 Free conformal method of infrared-band optical film
CN106943189A (en) * 2017-02-21 2017-07-14 上海理工大学 Target knife knife face adhesion preventing method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112095067A (en) * 2020-08-25 2020-12-18 电子科技大学 Preparation method of high-temperature-resistant infrared low-emissivity coating
CN112095067B (en) * 2020-08-25 2022-05-03 电子科技大学 Preparation method of high-temperature-resistant infrared low-emissivity coating

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