CN112831271A - Hole sealing agent for plasma spraying gradient thermal barrier coating and use method thereof - Google Patents
Hole sealing agent for plasma spraying gradient thermal barrier coating and use method thereof Download PDFInfo
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- CN112831271A CN112831271A CN202110005890.5A CN202110005890A CN112831271A CN 112831271 A CN112831271 A CN 112831271A CN 202110005890 A CN202110005890 A CN 202110005890A CN 112831271 A CN112831271 A CN 112831271A
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- barrier coating
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
- C09D5/10—Anti-corrosive paints containing metal dust
- C09D5/103—Anti-corrosive paints containing metal dust containing Al
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0812—Aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2251—Oxides; Hydroxides of metals of chromium
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- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention discloses a sealant for a plasma spraying gradient thermal barrier coating and a use method thereof, wherein the sealant comprises organic silicon resin, a filler, a curing agent and a catalyst, wherein: the weight percentage content of the organic silicon resin is 40-60 percent; the weight percentage content of the filler is 30-40%; the weight percentage content of the curing agent is 10-20 percent; the weight percentage content of the catalyst is 5-10%. The hole sealing agent can improve the corrosion resistance of the plasma spraying gradient thermal barrier coating.
Description
Technical Field
The invention relates to the technical field of plasma spraying, in particular to a hole sealing agent for a plasma spraying gradient thermal barrier coating and a using method thereof.
Background
In the fields of aviation, aerospace, energy and the like, the application of a plasma spraying technology is very wide, a coating prepared by the method is a layered stack structure formed by mutually staggering countless deformed particles and wavelike stacking, pores inevitably exist among deformed particles in the coating, particularly, the porosity in the gradient thermal barrier coating reaches 2% -6%, so that when the coating is stored in a humid environment, a corrosive medium directly reaches the surface of a protected substrate through the pores, chemical or electrochemical corrosion occurs between the coating and the substrate, corrosion products are accumulated on an interface, the coating is cracked and falls off, and finally the coating fails.
The main method for improving the corrosion resistance of the coating at the present stage is to prevent the corrosion medium from corroding the matrix, and the main means is to adopt a hole sealing agent for hole sealing treatment. The hole sealing treatment is to make the hole sealing agent immerge into the hole by various means and fill the hole, and when the hole is filled to strengthen the inside, a continuous and compact film is formed on the surface, thereby preventing the corrosion medium from corroding the matrix. The sealant should be selected from materials with good corrosion resistance, good permeability and fluidity.
At present, in an environment temperature of 250 ℃ and below, the main sealant materials are organic resins, such as phenolic resin, epoxy resin, acrylic resin and the like; esters and aromatic hydrocarbons are mostly used as the curing agent; phenolic resin, epoxy resin, acrylic resin and the like have good water resistance and strong permeability, but have poor compatibility with the gradient thermal barrier coating material.
Disclosure of Invention
In view of this, the invention provides a sealant for a plasma spraying gradient thermal barrier coating and a use method thereof, which can improve the corrosion resistance of the gradient thermal barrier coating.
The invention adopts the following technical scheme:
a sealant for a plasma sprayed gradient thermal barrier coating, comprising a silicone resin, a filler, a curing agent and a catalyst, wherein:
the weight percentage content of the organic silicon resin is 40-60%;
the weight percentage content of the filler is 30-40%;
the weight percentage content of the curing agent is 10-20%;
the weight percentage content of the catalyst is 5-10%.
Preferably, the silicone resin is a modified silicone resin modified by an acrylic resin, an epoxy resin or an alkyd resin.
Preferably, the filler is at least one of titanium dioxide, aluminum powder, alumina, chromium oxide, mica powder and vermiculite powder.
Preferably, the curing agent is toluene or propanol.
Preferably, the catalyst is at least one of dibutyl tin dilaurate, acids and bases that can catalyze silanol condensation reactions, and soluble organic salts of metals.
Preferably, the metal is lead, cobalt, tin or iron.
A method for sealing the plasma spraying gradient thermal barrier coating by using any one of the sealing agents provided by the technical scheme comprises the following steps:
uniformly coating the prepared sealant on the surface of the plasma spraying gradient thermal barrier coating by adopting a spraying, brushing or soaking process so as to enable the sealant to permeate into pores of the plasma spraying gradient thermal barrier coating;
curing the plasma spraying gradient thermal barrier coating after hole sealing;
grinding the coating to a preset size;
and removing the residual hole sealing agent on the surface of the plasma spraying gradient thermal barrier coating.
Preferably, the coating thickness of the hole sealing agent is 0.05 mm-0.2 mm.
Preferably, the step of curing the plasma spraying gradient thermal barrier coating after hole sealing specifically comprises the following steps:
curing the plasma spraying gradient thermal barrier coating at 40 ℃ for 24-72 h;
or, after pre-curing at room temperature for at least 3 hours, final curing is carried out at a temperature of 80 ℃ to 130 ℃ for 1 hour to 5 hours.
Preferably, a polishing process is adopted to remove the residual sealant on the surface of the plasma spraying gradient thermal barrier coating.
Has the advantages that:
the hole sealing agent is used for hole sealing treatment of a plasma spraying gradient thermal barrier coating and comprises 40-60 wt% of organic silicon resin, 30-40 wt% of filler, 10-20 wt% of curing agent and 5-10 wt% of catalyst; the organic silicon resin is a main hole sealing component, has good permeability, can be cured at normal temperature, and can effectively seal fine pores in the plasma spraying gradient thermal barrier coating; therefore, the sealant has the characteristics of simple use process, low operation temperature, quick curing and capability of effectively improving the production efficiency, and a coating adopting the sealant has excellent corrosion resistance and weather resistance.
Drawings
FIG. 1 is a process flow diagram of the sealing process of the plasma sprayed gradient thermal barrier coating using the sealing agent of the present invention.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
Example one
The embodiment of the invention provides a sealant for a plasma spraying gradient thermal barrier coating, which comprises organic silicon resin, a filler, a curing agent and a catalyst, wherein:
the weight percentage content of the organic silicon resin is 40-60%; the organic silicon resin can be modified organic silicon resin or unmodified organic silicon resin; the modified organic silicon resin is obtained by modifying organic silicon resin by adopting acrylic resin, epoxy resin or alkyd resin; the weight percentage content of the organic silicon resin can be specifically as follows: 40%, 42%, 43%, 45%, 46%, 48%, 50%, 52%, 54%, 55%, 56%, 58%, 60%;
the weight percentage content of the filler is 30-40%; the filler can be at least one of titanium dioxide, aluminum powder, alumina, chromium oxide, mica powder and vermiculite powder, namely the filler can be titanium dioxide, aluminum powder, alumina, chromium oxide, mica powder or vermiculite powder, or can be a mixture formed by two or more of titanium dioxide, aluminum powder, alumina, chromium oxide, mica powder and vermiculite powder; the weight percentage content of the filler can be specifically as follows: 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%;
the weight percentage content of the curing agent is 10-20%; the curing agent can be toluene or propanol; the curing agent comprises the following components in percentage by weight: 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%;
the weight percentage content of the catalyst is 5-10%; the catalyst may be at least one of dibutyl tin dilaurate, acids and bases that can catalyze silanol condensation reactions, and soluble organic salts of metals; the metal can be lead, cobalt, tin or iron, and can also be other metals with catalytic action; the weight percentage content of the catalyst can be 5%, 6%, 7%, 8%, 9% and 10%;
the organic silicon resin is a general name of a polymer which is formed by alternately connecting silicon atoms and oxygen atoms to form a framework, and different organic groups are connected with the silicon atoms. The organic silicon resin structure contains both organic groups and inorganic structures, and the special composition and molecular structure integrates the characteristics of organic matters and inorganic matters, has the characteristics of excellent thermal oxidation stability, electric insulation performance, weather resistance, water resistance, salt mist resistance, mildew resistance, biocompatibility and the like, and can be modified and matched with organic resins and inorganic materials to realize structural function integration.
The organic silicon resin in the hole sealing agent is a main hole sealing component, has good permeability, can be cured at normal temperature, and can effectively seal fine pores in the plasma spraying gradient thermal barrier coating; the proportion of methyl groups and phenyl groups in the organic silicon resin groups has great influence on the performance of the organic silicon resin, the lower the phenyl content is, the softer a paint film is generated, the faster the condensation is, the higher the phenyl content is, the harder the paint film is, the more thermoplastic the paint film is, and when the phenyl content is between 20% and 60%, the bending resistance and the heat resistance of the organic silicon resin paint are the best; toluene, propanol and the like are taken as curing agents, and the principle is realized by forming silica chain links through silanol condensation; therefore, the sealant adopting the organic silicon resin has the characteristics of simple use process, low operation temperature, quick curing and capability of effectively improving the production efficiency, and a coating adopting the sealant has excellent corrosion resistance and weather resistance.
When the condensation reaction is carried out, the reaction rate is reduced due to the fact that the concentration of silanol is gradually reduced, steric hindrance is increased, and the fluidity is poor; the prepared organic silicon resin is used up within 3 hours, so as to avoid waste after the activation period is exceeded; and the hole sealing agent is arranged in a place which is dry, waterproof, leakproof, sun-proof, high-temperature-proof and far away from a fire source.
In the actual use process, the sealant can adopt the following specific formula:
the formula I is as follows: the hole sealing agent comprises 50% by weight of organic silicon resin, 35% by weight of aluminum powder, 10% by weight of toluene and 5% by weight of dibutyl tin dilaurate.
And a second formula: the hole sealing agent comprises 48 wt% of organic silicon resin, 34 wt% of chromium oxide and mica powder, 12 wt% of propanol and 6 wt% of acid and alkali.
And the formula III: the hole sealing agent comprises 52 weight percent of organic silicon resin, 31 weight percent of titanium dioxide, aluminum oxide, chromium oxide, mica powder and vermiculite powder, 11 weight percent of propanol and 6 weight percent of lead metal soluble organic salt.
The three specific formulas of the sealant listed above are only a part of the various formulas, and are not all the formulas of the sealant, and other formulas not listed can also be adopted in the actual production process.
Example two
Referring to fig. 1, a method for sealing an ion sprayed gradient thermal barrier coating by using the sealing agent in the above embodiment includes the following steps:
step S10, uniformly coating the sealant prepared according to the preset weight percentage on the surface of the plasma spraying gradient thermal barrier coating by adopting a spraying, brushing or soaking process, so that the sealant permeates into pores of the plasma spraying gradient thermal barrier coating; the coating thickness of the sealant coated on the surface of the plasma spraying gradient thermal barrier coating can be 0.05 mm-0.2 mm, such as: 0.05mm, 0.1mm, 0.15mm, 0.2 mm;
step S20, curing the plasma spraying gradient thermal barrier coating after hole sealing; when the plasma spraying gradient thermal barrier coating after hole sealing is cured, two treatment methods can be specifically adopted, wherein the first curing treatment method is used for curing the plasma spraying gradient thermal barrier coating for 24-72 h at 40 ℃, and the curing time can be specifically 24h, 36h, 48h and 72 h; the second curing treatment method comprises the steps of performing pre-curing for at least 3 hours at room temperature, and then performing final curing for 1 to 5 hours at the temperature of 80 to 130 ℃, wherein the curing temperature can be 80 ℃, 90 ℃, 100 ℃, 110 ℃, 120 ℃ and 130 ℃, and the curing time can be 1 hour, 2 hours, 3 hours, 4 hours and 5 hours; in the actual production process, the curing temperature and the curing time can be selected according to the actual situation;
step S30, grinding the coating to a preset size; after the coated hole sealing agent is cured, grinding the coating to ensure that the thickness of the coated coating meets the size requirement and does not exceed the range of the preset size; such as: in the actual production process, the preset size can be 0.1 mm;
step S40, removing the residual hole sealing agent on the surface of the plasma spraying gradient thermal barrier coating; when the residual surplus sealant on the surface is removed, the residual sealant on the surface of the plasma spraying gradient thermal barrier coating can be removed by adopting a polishing process.
When the method is adopted to carry out hole sealing treatment on the plasma spraying gradient thermal barrier coating, the hole sealing agent can be cured at normal temperature due to the adoption of the organic silicon resin, so that the hole sealing agent has the characteristics of simple use process, low operation temperature, high curing speed and effectively improved production efficiency; meanwhile, the organic silicon resin has good permeability, so that fine pores in the plasma spraying gradient thermal barrier coating can be effectively sealed, and the plasma spraying gradient thermal barrier coating adopting the hole sealing agent has excellent corrosion resistance and weather resistance.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A sealant for a plasma spraying gradient thermal barrier coating is characterized by comprising organic silicon resin, a filler, a curing agent and a catalyst, wherein:
the weight percentage content of the organic silicon resin is 40-60%;
the weight percentage content of the filler is 30-40%;
the weight percentage content of the curing agent is 10-20%;
the weight percentage content of the catalyst is 5-10%.
2. The sealant according to claim 1, wherein the silicone resin is a modified silicone resin modified by an acrylic resin, an epoxy resin or an alkyd resin.
3. The sealant according to claim 1, wherein the filler is at least one of titanium dioxide, aluminum powder, alumina, chromium oxide, mica powder, and vermiculite powder.
4. The sealant of claim 1 wherein the curing agent is toluene or propanol.
5. The sealant of claim 1 wherein said catalyst is at least one of dibutyl tin dilaurate, acids and bases that catalyze silanol condensation reactions, and soluble organic salts of metals.
6. The sealant of claim 5 wherein the metal is lead, cobalt, tin or iron.
7. A method of sealing an ion sprayed gradient thermal barrier coating using the sealant according to any one of claims 1 to 6, comprising the steps of:
uniformly coating the prepared sealant on the surface of the plasma spraying gradient thermal barrier coating by adopting a spraying, brushing or soaking process so as to enable the sealant to permeate into pores of the plasma spraying gradient thermal barrier coating;
curing the plasma spraying gradient thermal barrier coating after hole sealing;
grinding the coating to a preset size;
and removing the residual hole sealing agent on the surface of the plasma spraying gradient thermal barrier coating.
8. The method of claim 7, wherein the sealant is applied to a thickness of 0.05mm to 0.2 mm.
9. The method as claimed in claim 7, wherein the step of curing the plasma sprayed gradient thermal barrier coating after sealing comprises:
curing the plasma spraying gradient thermal barrier coating at 40 ℃ for 24-72 h;
or, after pre-curing at room temperature for at least 3 hours, final curing is carried out at a temperature of 80 ℃ to 130 ℃ for 1 hour to 5 hours.
10. The method of claim 9, wherein a polishing process is used to remove residual sealant on the surface of the plasma sprayed gradient thermal barrier coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110005890.5A CN112831271A (en) | 2021-01-05 | 2021-01-05 | Hole sealing agent for plasma spraying gradient thermal barrier coating and use method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110005890.5A CN112831271A (en) | 2021-01-05 | 2021-01-05 | Hole sealing agent for plasma spraying gradient thermal barrier coating and use method thereof |
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| CN112831271A true CN112831271A (en) | 2021-05-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113399232A (en) * | 2021-06-22 | 2021-09-17 | 河南科技大学 | Composite ceramic coating adaptive to motor insulating bearing and preparation method thereof |
| CN115011910A (en) * | 2022-05-20 | 2022-09-06 | 国能锅炉压力容器检验有限公司 | Hole sealing agent applied to electric arc spraying coating of power station boiler, preparation method and use method |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113399232A (en) * | 2021-06-22 | 2021-09-17 | 河南科技大学 | Composite ceramic coating adaptive to motor insulating bearing and preparation method thereof |
| CN115011910A (en) * | 2022-05-20 | 2022-09-06 | 国能锅炉压力容器检验有限公司 | Hole sealing agent applied to electric arc spraying coating of power station boiler, preparation method and use method |
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