CN113969385B - Preparation method of ceramic-based sealing coating with brick-mud layered structure - Google Patents

Preparation method of ceramic-based sealing coating with brick-mud layered structure Download PDF

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CN113969385B
CN113969385B CN202111255442.7A CN202111255442A CN113969385B CN 113969385 B CN113969385 B CN 113969385B CN 202111255442 A CN202111255442 A CN 202111255442A CN 113969385 B CN113969385 B CN 113969385B
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ceramic
mud
preparing
aluminum garnet
yttrium aluminum
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CN113969385A (en
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程涛涛
王志平
韩志勇
王仕成
邢思佳
朱妍
肖玉汗
王梦婷
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Civil Aviation University of China
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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
    • 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
    • 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
    • C23C4/12—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

Abstract

A preparation method of a ceramic-based sealing coating with a brick-mud layered structure. Which comprises the preparation of a composition containing yttrium aluminum garnet; preparing ceramic-based agglomerated powder containing yttrium aluminum garnet; preparing a mud layer organic solvent; preparing a metal bonding layer; preparing a ceramic-based sealing coating containing yttrium aluminum garnet; preparing a mud layer; and (3) preparing the ceramic-based sealing coating with the brick-mud layered structure. The invention has low cost and simple preparation process, and can prepare the ceramic-based high-temperature sealing coating with a brick-mud layered structure by spraying a plurality of mud layers prepared from the isopropanol and MK resin on the basis of plasma spraying the ceramic-based sealing coating by using a small amount of the isopropanol and MK resin. The thermal cycle life is high, the energy is consumed through micro-cracking of the mud layer in the thermal cycle process, the residual stress is released, and the integral crack expansion driving force of the coating is reduced, so that the thermal cycle life of the ceramic-based seal coating is prolonged.

Description

Preparation method of ceramic-based sealing coating with brick-mud layered structure
Technical Field
The invention belongs to the technical field of structural design and optimization of ceramic-based sealing coatings, and particularly relates to a preparation method of a ceramic-based sealing coating with a brick-mud layered structure.
Background
Ceramic-based seal coatings are generally a complex multi-layer composite system that generally includes a nickel-based superalloy substrate, a metal bond coat (BC layer), a thermally grown oxide layer (TGO layer), and a ceramic top layer (TC layer). In the service process, the complex system structure and the severe service environment of the ceramic-based seal coating can lead to failure of the coating in the use process, including electrochemical and thermal corrosion of a salt solution in a marine atmosphere environment, mechanical erosion of inclusions in high-speed airflow, thermal aging caused by high-temperature gas oxidation, fatigue cracking caused by high-temperature and low-temperature impact and the like. The most obvious influence is fatigue cracking of the ceramic surface layer in the thermal cycle process, and the cracking and falling of the ceramic surface layer can cause the coating to be directly invalid, so that the coating loses a sealing function, and the ceramic-based sealing coating is a problem to be solved in the application process.
In the aspect of optimizing the thermal cycle performance of the thermal spraying ceramic substrate layer, domestic and foreign scientific researchers have achieved some results. Early researchers can prepare a ceramic surface layer with a columnar structure by using an electron beam physical vapor deposition (EB-PVD) method, and can effectively release the growth stress and the thermal mismatch stress of a TGO layer in the thermal cycle process through numerous longitudinal microcracking among columns, so that the ceramic surface layer prepared by the EB-PVD method has good thermal cycle performance, but the EB-PVD method has high cost and extremely low coating deposition efficiency, and is not suitable for coating preparation and commercial application of large-scale components. Suspension plasma spraying technology (SPS), plasma physical vapor deposition technology (PS-PVD) and the like proposed in the last 10 years can be used for preparing a coating with a similar columnar structure, so that the thermal cycle performance of a ceramic surface layer is improved to different degrees, but the methods have high requirements on raw materials, meanwhile, equipment is expensive, the process is complex, and the method has no great advantage in the aspect of cost control. In recent years, a method for releasing residual stress by utilizing longitudinal cracks is proposed, a surface concentrated heating mode is utilized to enable a ceramic surface layer to generate longitudinal cracks perpendicular to the coating direction, and stress concentration at the interface between the ceramic surface layer and the TGO can be relieved by the longitudinal cracks, so that growth stress and thermal mismatch stress of the TGO layer are released, and the thermal cycle life of the coating is prolonged. The method has simple process and low cost, but longitudinal cracks are generated by a surface concentrated heating mode, the density is not high, the distribution is uneven, and the effect of improving the thermal cycle performance of the coating is limited, so that the application is greatly limited.
The research adopts a certain technology or method to optimize the microscopic morphology of the ceramic coating, and improves the thermal cycle cracking resistance of the ceramic surface layer by releasing the growing stress of the TGO layer and the thermal mismatch stress at the interface of the ceramic surface layer/TGO layer, which are continuously increased in the thermal cycle process, but the method still has the problems of high preparation cost, low production efficiency, large technical difficulty, poor effect and the like.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a preparation method of a ceramic-based sealing coating with a brick-mud layered structure.
In order to achieve the above purpose, the preparation method of the ceramic-based seal coating with the brick-mud layered structure provided by the invention comprises the following steps in sequence:
1) Preparation of yttrium aluminum garnet-containing composition: crushing yttrium aluminum garnet, yttria Stabilized Zirconia (YSZ) and polyphenyl ester respectively by using a ball mill to prepare powder, and then uniformly mixing the powder with sodium hexametaphosphate, polyethylene glycol (PEG) and polyvinyl alcohol (PVA) to prepare a composition containing yttrium aluminum garnet;
2) Preparation of ceramic-based agglomerated powder containing yttrium aluminum garnet: preparing the yttrium aluminum garnet-containing composition into yttrium aluminum garnet-containing ceramic-based agglomerated powder by using a spray granulator;
3) Preparing a mud layer organic solvent: stirring isopropyl alcohol serving as a solvent and MK resin serving as a solute by using a magnetic stirrer to prepare a mud layer organic solvent;
4) Preparing a metal bonding layer: spraying CoCrAlY powder on the surface of a nickel-based alloy matrix by using a plasma spraying technology to prepare a metal bonding layer;
5) Preparing a ceramic-based sealing coating containing yttrium aluminum garnet: spraying the yttrium aluminum garnet-containing ceramic matrix agglomerated powder prepared in the step 2) on the surface of the metal bonding layer by utilizing a plasma spraying technology to prepare a yttrium aluminum garnet-containing ceramic matrix sealing coating serving as a brick layer;
6) Preparing a mud layer, namely spraying the organic solvent of the mud layer prepared in the step 3) on the surface of the ceramic-based sealing coating containing yttrium aluminum garnet by using a spraying gun to prepare the mud layer;
7) Preparing a ceramic-based sealing coating with a brick-mud layered structure: repeating the steps 5) and 6) until the required coating thickness is reached, thereby preparing the ceramic-based seal coating with the brick-mud layered structure.
In the step 1), the weight ratio of the yttrium aluminum garnet powder, the Yttria Stabilized Zirconia (YSZ) powder, the polyphenyl ester powder, the sodium hexametaphosphate, the polyethylene glycol (PEG) and the polyvinyl alcohol (PVA) is 8-13:140-160:10-15:3-5:3-5; the rotating speed of the ball mill is 600-800 r/min, and ZrO is adopted 2 Grinding balls, wherein the ball milling medium is absolute ethyl alcohol, and the ball milling time is 10-12 h.
In the step 2), the inlet temperature of the spray granulator is 180-220 ℃, the outlet temperature is 100-120 ℃, and the atomization rotating speed is 6000-6500 r/min.
In the step 3), the weight ratio of the isopropyl alcohol to the MK resin is 30-40:3-4; the rotating speed of the magnetic stirrer is 500-600 r/min, the stirring time is 10-12 h, and the stirring temperature is room temperature.
In the step 4), the voltage of the plasma spraying is 40-41V, the current is 780-800A, the powder feeding rate is 30-35 g/min, the spraying distance is 100-120 mm, and the thickness of the metal bonding layer is 100-150 mu m.
In the step 5), the voltage of the plasma spraying is 37-38V, the current is 750-760A, the powder feeding rate is 30-35 g/min, the spraying distance is 100-120 mm, and the thickness of the ceramic-based sealing coating containing yttrium aluminum garnet is 150-200 mu m.
In the step 6), the pressure of the spraying gun is 0.5-0.6 MPa, and the spraying distance is 300-350 mm.
The preparation method of the ceramic-based seal coating with the brick-mud layered structure provided by the invention has the following advantages:
(1) The cost is low, the preparation process is simple, only a small amount of isopropanol and MK resin raw materials are needed, and on the basis of plasma spraying the ceramic-based sealing coating, a plurality of mud layers prepared from isopropanol and MK resin are sprayed, so that the ceramic-based sealing coating with a brick-mud layered structure can be prepared.
(2) The thermal cycle life is high, the energy is consumed through micro-cracking of the mud layer in the thermal cycle process, and the residual stress is released, so that the integral crack expansion driving force of the ceramic-based seal coating with the layered structure is reduced, and the thermal cycle life of the ceramic-based seal coating is prolonged.
Drawings
FIG. 1 shows the microscopic morphology of ceramic-based agglomerated powder of yttrium aluminum garnet prepared by spray granulation technique according to the present invention, wherein the magnifications of (a), (b), and (c) are 100, 500, and 5000, respectively.
Fig. 2 shows the microscopic morphology of the "mud" layer prepared using a spray gun, with (a) and (b) at magnifications of 200 and 2000, respectively.
FIG. 3 shows the cross-sectional morphology of a 150-time thermal cycle sample of a ceramic-based seal coating of the prior monolithic structure.
Fig. 4 shows the morphology of a 150-time thermal cycle cross section of the ceramic-based seal coating with a "brick-mud" layered structure provided by the invention.
Detailed Description
The following detailed description of embodiments of the invention is exemplary and intended to be illustrative of the invention and not to be construed as limiting the invention.
Example 1:
the preparation method of the ceramic matrix sealing coating with the brick-mud layered structure provided by the embodiment comprises the following steps in sequence:
1) Preparation of yttrium aluminum garnet-containing composition: crushing yttrium aluminum garnet, yttria Stabilized Zirconia (YSZ) and polyphenyl ester respectively by using a ball mill to prepare powder, and uniformly mixing the powder with sodium hexametaphosphate, polyethylene glycol (PEG) and polyvinyl alcohol (PVA) in a weight ratio of 8:140:10:3:3:3 to prepare a composition containing yttrium aluminum garnet; the rotating speed of the ball mill is 600r/min, and ZrO is adopted 2 Grinding balls, wherein the ball milling medium is absolute ethyl alcohol, and the ball milling time is 10 hours.
2) Preparation of ceramic-based agglomerated powder containing yttrium aluminum garnet: preparing the yttrium aluminum garnet-containing composition into yttrium aluminum garnet-containing ceramic-based agglomerated powder by using a spray granulator; the inlet temperature of the spray granulator is 180 ℃, the outlet temperature is 100 ℃, and the atomization rotating speed is 6000r/min.
3) Preparing a mud layer organic solvent: stirring isopropanol as a solvent and MK resin as a solute according to a weight ratio of 30:3 by using a magnetic stirrer to prepare a mud layer organic solvent; the rotation speed of the magnetic stirrer is 500r/min, the stirring time is 10h, and the stirring temperature is room temperature.
4) Preparing a metal bonding layer: spraying CoCrAlY powder with the mark of CO110 on the surface of a nickel-based alloy matrix by using a plasma spraying technology to prepare a metal bonding layer; the plasma spraying voltage is 40V, the current is 780A, the powder feeding rate is 30g/min, the spraying distance is 100mm, and the thickness of the metal bonding layer is 100 mu m.
5) Preparing a ceramic-based sealing coating containing yttrium aluminum garnet: spraying the yttrium aluminum garnet-containing ceramic matrix agglomerated powder prepared in the step 2) on the surface of the metal bonding layer by utilizing a plasma spraying technology to prepare a yttrium aluminum garnet-containing ceramic matrix sealing coating serving as a brick layer; the plasma spraying voltage is 37V, the current is 750A, the powder feeding rate is 30g/min, the spraying distance is 100mm, and the thickness of the ceramic-based sealing coating containing yttrium aluminum garnet is 150 mu m.
6) Preparing a mud layer, namely spraying the organic solvent of the mud layer prepared in the step 3) on the surface of the ceramic-based sealing coating containing yttrium aluminum garnet by using a spraying gun to prepare the mud layer; the pressure of the spray gun is 0.5MPa, and the spray distance is 300mm.
7) Preparing a ceramic-based sealing coating with a brick-mud layered structure: repeating the steps 5) and 6) until the required coating thickness is reached, thereby preparing the ceramic-based seal coating with the brick-mud layered structure.
Example 2:
the preparation method of the ceramic matrix sealing coating with the brick-mud layered structure provided by the embodiment comprises the following steps in sequence:
1) Preparation of yttrium aluminum garnet-containing composition: crushing yttrium aluminum garnet, yttria Stabilized Zirconia (YSZ) and polyphenyl ester respectively by using a ball mill to prepare powder, and uniformly mixing the powder with sodium hexametaphosphate, polyethylene glycol (PEG) and polyvinyl alcohol (PVA) in a weight ratio of 13:160:15:5:5:5 to prepare a composition containing yttrium aluminum garnet; the rotating speed of the ball mill is 800r/min, and ZrO is adopted 2 Grinding balls, wherein the ball milling medium is absolute ethyl alcohol, and the ball milling time is 12 hours.
2) Preparation of ceramic-based agglomerated powder containing yttrium aluminum garnet: preparing the yttrium aluminum garnet-containing composition into yttrium aluminum garnet-containing ceramic-based agglomerated powder by using a spray granulator; the inlet temperature of the spray granulator is 220 ℃, the outlet temperature is 120 ℃, and the atomization rotating speed is 6500r/min.
3) Preparing a mud layer organic solvent: stirring isopropanol as a solvent and MK resin as a solute according to a weight ratio of 30:4 by using a magnetic stirrer to prepare a mud layer organic solvent; the rotation speed of the magnetic stirrer is 600r/min, the stirring time is 12h, and the stirring temperature is room temperature.
4) Preparing a metal bonding layer: spraying CoCrAlY powder with the mark of CO110 on the surface of a nickel-based alloy matrix by using a plasma spraying technology to prepare a metal bonding layer; the plasma spraying voltage is 41V, the current is 800A, the powder feeding speed is 35g/min, the spraying distance is 120mm, and the thickness of the metal bonding layer is 150 mu m.
5) Preparing a ceramic-based sealing coating containing yttrium aluminum garnet: spraying the yttrium aluminum garnet-containing ceramic matrix agglomerated powder prepared in the step 2) on the surface of the metal bonding layer by utilizing a plasma spraying technology to prepare a yttrium aluminum garnet-containing ceramic matrix sealing coating serving as a brick layer; the plasma spraying voltage is 38V, the current is 760A, the powder feeding rate is 35g/min, the spraying distance is 120mm, and the thickness of the ceramic-based sealing coating containing yttrium aluminum garnet is 200 mu m.
6) Preparing a mud layer, namely spraying the organic solvent of the mud layer prepared in the step 3) on the surface of the ceramic-based sealing coating containing yttrium aluminum garnet by using a spraying gun to prepare the mud layer; the pressure of the spray gun is 0.6MPa, and the spray distance is 350mm.
7) Preparing a ceramic-based sealing coating with a brick-mud layered structure: repeating the steps 5) and 6) until the required coating thickness is reached, thereby preparing the ceramic-based seal coating with the brick-mud layered structure.
Example 3:
the preparation method of the ceramic matrix sealing coating with the brick-mud layered structure provided by the embodiment comprises the following steps in sequence:
1) Preparation of yttrium aluminum garnet-containing composition: crushing yttrium aluminum garnet, yttria Stabilized Zirconia (YSZ) and polyphenyl ester respectively by using a ball mill to prepare powder, and uniformly mixing the powder with sodium hexametaphosphate, polyethylene glycol (PEG) and polyvinyl alcohol (PVA) in a weight ratio of 10:150:13:4:4:4 to prepare a composition containing yttrium aluminum garnet; the rotating speed of the ball mill is 700r/min, and ZrO is adopted 2 Grinding balls, wherein the ball milling medium is absolute ethyl alcohol, and the ball milling time is 11h.
2) Preparation of ceramic-based agglomerated powder containing yttrium aluminum garnet: preparing the yttrium aluminum garnet-containing composition into yttrium aluminum garnet-containing ceramic-based agglomerated powder by using a spray granulator; the inlet temperature of the spray granulator is 200 ℃, the outlet temperature is 110 ℃, and the atomization rotating speed is 6300r/min.
3) Preparing a mud layer organic solvent: stirring isopropanol as a solvent and MK resin as a solute according to a weight ratio of 40:3 by using a magnetic stirrer to prepare a mud layer organic solvent; the rotation speed of the magnetic stirrer is 550r/min, the stirring time is 11h, and the stirring temperature is room temperature.
4) Preparing a metal bonding layer: spraying CoCrAlY powder with the mark of CO110 on the surface of a nickel-based alloy matrix by using a plasma spraying technology to prepare a metal bonding layer; the plasma spraying voltage is 40V, the current is 790A, the powder feeding rate is 33g/min, the spraying distance is 110mm, and the thickness of the metal bonding layer is 130 mu m.
5) Preparing a ceramic-based sealing coating containing yttrium aluminum garnet: spraying the yttrium aluminum garnet-containing ceramic matrix agglomerated powder prepared in the step 2) on the surface of the metal bonding layer by utilizing a plasma spraying technology to prepare a yttrium aluminum garnet-containing ceramic matrix sealing coating serving as a brick layer; the plasma spraying voltage is 38V, the current is 755A, the powder feeding rate is 32g/min, the spraying distance is 110mm, and the thickness of the ceramic-based sealing coating containing yttrium aluminum garnet is 180 mu m.
6) Preparing a mud layer, namely spraying the organic solvent of the mud layer prepared in the step 3) on the surface of the ceramic-based sealing coating containing yttrium aluminum garnet by using a spraying gun to prepare the mud layer; the pressure of the spray gun is 0.5MPa, and the spray distance is 330mm.
7) Preparing a ceramic-based sealing coating with a brick-mud layered structure: repeating the steps 5) and 6) until the required coating thickness is reached, thereby preparing the ceramic-based seal coating with the brick-mud layered structure.
Fig. 1 shows the microscopic morphology of yttrium aluminum garnet-containing ceramic-based agglomerated powder, and as can be seen from fig. 1, the yttrium aluminum garnet-containing ceramic-based agglomerated powder is spherical, and yttrium aluminum garnet particles have better dispersibility on agglomerated particles and are distributed uniformly. The flowability and bulk density of the ceramic-based agglomerated powder containing yttrium aluminum garnet were 88.06s/50g and 0.941g/cm, respectively 3 The plasma spraying requirements of the invention can be satisfied.
FIG. 2 is a microscopic morphology of a "mud" layer prepared using a spray gun. As can be seen from fig. 2, the "mud" layer is uniformly spread on the surface of the "brick" layer prepared by plasma spraying.
Fig. 3 and 4 are respectively the cross-sectional morphology of 150 thermal cycles of the ceramic-based seal coating with the existing monolithic structure and the ceramic-based seal coating with the "brick-mud" layered structure provided in the above embodiment. As can be seen from fig. 3, after 150 thermal cycling tests, the ceramic-based seal coating of the existing monolithic structure had obvious transverse cracks along the interface between the metal bonding layer and the ceramic surface layer, and the coating had signs of global peeling. As can be seen from fig. 4, after 150 thermal cycle tests, the ceramic-based seal coating with the "brick-mud" layered structure has still good interface bonding between the metal bonding layer and the ceramic surface layer, and longitudinal microcracks appear in the ceramic surface layer.
The reason that the ceramic-based seal coating with the brick-mud layered structure has better thermal cycle life is mainly that the mud layer in the brick-mud layered structure is a weak layer with low fracture toughness, and the mud layer with low fracture toughness can be subjected to micro-cracking preferentially in the thermal cycle test process, so that a large amount of energy is consumed, the integral crack expansion driving force of the ceramic-based seal coating with the layered structure is reduced, and the thermal cycle life of the ceramic-based seal coating is prolonged.

Claims (7)

1. A preparation method of a ceramic matrix sealing coating with a brick-mud layered structure is characterized by comprising the following steps: the method comprises the following steps in sequence:
1) Preparation of yttrium aluminum garnet-containing composition: crushing yttrium aluminum garnet, yttria-stabilized zirconia and polyphenyl ester respectively by using a ball mill to prepare powder, and then uniformly mixing the powder with sodium hexametaphosphate, polyethylene glycol and polyvinyl alcohol to prepare a composition containing yttrium aluminum garnet;
2) Preparation of ceramic-based agglomerated powder containing yttrium aluminum garnet: preparing the yttrium aluminum garnet-containing composition into yttrium aluminum garnet-containing ceramic-based agglomerated powder by using a spray granulator;
3) Preparing a mud layer organic solvent: stirring isopropyl alcohol serving as a solvent and MK resin serving as a solute by using a magnetic stirrer to prepare a mud layer organic solvent;
4) Preparing a metal bonding layer: spraying CoCrAlY powder on the surface of a nickel-based alloy matrix by using a plasma spraying technology to prepare a metal bonding layer;
5) Preparing a ceramic-based sealing coating containing yttrium aluminum garnet: spraying the yttrium aluminum garnet-containing ceramic matrix agglomerated powder prepared in the step 2) on the surface of the metal bonding layer by utilizing a plasma spraying technology to prepare a yttrium aluminum garnet-containing ceramic matrix sealing coating serving as a brick layer;
6) Preparing a mud layer, namely spraying the organic solvent of the mud layer prepared in the step 3) on the surface of the ceramic-based sealing coating containing yttrium aluminum garnet by using a spraying gun to prepare the mud layer;
7) Preparing a ceramic-based sealing coating with a brick-mud layered structure: repeating the steps 5) and 6) until the required coating thickness is reached, thereby preparing the ceramic-based seal coating with the brick-mud layered structure.
2. The method for preparing the ceramic-based seal coating with the brick-mud layered structure according to claim 1, which is characterized in that: in the step 1), the weight ratio of the yttrium aluminum garnet powder, the Yttria Stabilized Zirconia (YSZ) powder, the polyphenyl ester powder, the sodium hexametaphosphate, the polyethylene glycol (PEG) and the polyvinyl alcohol (PVA) is 8-13:140-160:10-15:3-5:3-5; the rotating speed of the ball mill is 600-800 r/min, and ZrO is adopted 2 Grinding balls, wherein the ball milling medium is absolute ethyl alcohol, and the ball milling time is 10-12 h.
3. The method for preparing the ceramic-based seal coating with the brick-mud layered structure according to claim 1, which is characterized in that: in the step 2), the inlet temperature of the spray granulator is 180-220 ℃, the outlet temperature is 100-120 ℃, and the atomization rotating speed is 6000-6500 r/min.
4. The method for preparing the ceramic-based seal coating with the brick-mud layered structure according to claim 1, which is characterized in that: in the step 3), the weight ratio of the isopropyl alcohol to the MK resin is 30-40:3-4; the rotating speed of the magnetic stirrer is 500-600 r/min, the stirring time is 10-12 h, and the stirring temperature is room temperature.
5. The method for preparing the ceramic-based seal coating with the brick-mud layered structure according to claim 1, which is characterized in that: in the step 4), the voltage of the plasma spraying is 40-41V, the current is 780-800A, the powder feeding rate is 30-35 g/min, the spraying distance is 100-120 mm, and the thickness of the metal bonding layer is 100-150 mu m.
6. The method for preparing the ceramic-based seal coating with the brick-mud layered structure according to claim 1, which is characterized in that: in the step 5), the voltage of the plasma spraying is 37-38V, the current is 750-760A, the powder feeding rate is 30-35 g/min, the spraying distance is 100-120 mm, and the thickness of the ceramic-based sealing coating containing yttrium aluminum garnet is 150-200 mu m.
7. The method for preparing the ceramic-based seal coating with the brick-mud layered structure according to claim 1, which is characterized in that: in the step 6), the pressure of the spraying gun is 0.5-0.6 MPa, and the spraying distance is 300-350 mm.
CN202111255442.7A 2021-10-27 2021-10-27 Preparation method of ceramic-based sealing coating with brick-mud layered structure Active CN113969385B (en)

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