CN111960837A - Preparation method of rare earth tantalate or niobate thermal barrier coating - Google Patents
Preparation method of rare earth tantalate or niobate thermal barrier coating Download PDFInfo
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- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 53
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 53
- 239000012720 thermal barrier coating Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 59
- 239000000919 ceramic Substances 0.000 claims abstract description 40
- 239000000463 material Substances 0.000 claims abstract description 16
- 238000000151 deposition Methods 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 230000003247 decreasing effect Effects 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims description 22
- 239000011248 coating agent Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 17
- 239000002002 slurry Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 238000005245 sintering Methods 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 7
- KBPLFHHGFOOTCA-UHFFFAOYSA-N caprylic alcohol Natural products CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 claims description 6
- 238000007873 sieving Methods 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 3
- 239000002202 Polyethylene glycol Substances 0.000 claims description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 230000008021 deposition Effects 0.000 claims description 3
- 239000012065 filter cake Substances 0.000 claims description 3
- 238000005469 granulation Methods 0.000 claims description 3
- 230000003179 granulation Effects 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910017604 nitric acid Inorganic materials 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 229920001223 polyethylene glycol Polymers 0.000 claims description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 2
- 239000000654 additive Substances 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims description 2
- 239000008367 deionised water Substances 0.000 claims description 2
- 229910021641 deionized water Inorganic materials 0.000 claims description 2
- 238000010891 electric arc Methods 0.000 claims description 2
- 238000007749 high velocity oxygen fuel spraying Methods 0.000 claims description 2
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 claims description 2
- 230000001376 precipitating effect Effects 0.000 claims description 2
- 229910001404 rare earth metal oxide Inorganic materials 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- 229910052758 niobium Inorganic materials 0.000 abstract description 6
- 239000010955 niobium Substances 0.000 abstract description 6
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 28
- 230000008901 benefit Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 238000005524 ceramic coating Methods 0.000 description 5
- 239000011247 coating layer Substances 0.000 description 4
- 238000005137 deposition process Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910001233 yttria-stabilized zirconia Inorganic materials 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000000975 co-precipitation Methods 0.000 description 2
- 229910052715 tantalum Inorganic materials 0.000 description 2
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 2
- 229910002230 La2Zr2O7 Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002256 photodeposition Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/495—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on vanadium, niobium, tantalum, molybdenum or tungsten oxides or solid solutions thereof with other oxides, e.g. vanadates, niobates, tantalates, molybdates or tungstates
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- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3251—Niobium oxides, niobates, tantalum oxides, tantalates, or oxide-forming salts thereof
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Abstract
The invention relates to the technical field of thermal barrier coatings, and particularly discloses a preparation method of a rare earth tantalate or niobate thermal barrier coating, which comprises the following steps: taking more than two different rare earth tantalates (RETaO)4) Or niobate (RENbO)4) Mixing ceramic powder into n parts of mixed ceramic powder, wherein the volume fraction of at least one rare earth tantalate or niobate ceramic component in the n parts of mixed ceramic powder is continuously increased or decreased; and sequentially depositing n parts of mixed ceramic powder on a base material to obtain the multi-gradient rare earth tantalate or niobate thermal barrier coating. The scheme of the patent can ensure that the thermal barrier coating has the original rare earth niobium/tantalate ceramic (RENB/TaO)4) The ceramic has high expansion coefficient, and the thermal conductivity of the ceramic is also greatly reduced, and the thermal conductivity is not more than 1 through experimental detection.20W·m‑1·K‑1And the requirement of the thermal barrier coating on low thermal conductivity is met.
Description
Technical Field
The invention relates to the technical field of thermal barrier coatings, in particular to a preparation method of a rare earth tantalate or niobate thermal barrier coating.
Background
The thermal barrier coating protects the base material by utilizing the heat insulation and corrosion resistance characteristics of the ceramic, and has important application value in the aspects of aviation, aerospace, ships, weapons and the like. At present, the widely used thermal barrier coating materials are mainly 6% -8% of yttria-stabilized zirconia (6-8YSZ) and lanthanum zirconate (La)2Zr2O7) Both of these ceramics have some disadvantages: the use temperature of 6-8YSZ is lower (less than or equal to 1200 ℃), and the thermal conductivity is higher (about 2.5 W.m)-1·k-1，900℃)，La2Zr2O7The thermal expansion coefficient is low, and with the future development requirements of high thrust-weight ratio and high outlet temperature of engines and gas turbines, the search for novel thermal barrier coating materials is urgent.
Rare earth niobium/tantalate ceramics (RENb/TaO)4) With high melting point and low thermal conductivity (1.38-1.94 W.m)-1·K-1) High coefficient of thermal expansion (11X 10)-6K-11200 ℃ and the iron elastic toughness, and the like, and is considered as a new generation of thermal barrier coating material with the most potential. Imparting niobium/tantalate to rare earth by ferroelastic toughening mechanismThe ceramic has excellent high-temperature fracture toughness, which is a unique advantage that other potential thermal barrier coating materials do not have; the use of the material in the field of thermal barrier coatings is also under study, and how to maximize the use of the material is shown in rare earth niobium/tantalate ceramics (RENB/TaO)4) The protective effect of ceramic coatings on base alloys remains the focus of current research.
Disclosure of Invention
The invention provides a preparation method of a rare earth tantalate or niobate thermal barrier coating, which aims to obtain rare earth niobium/tantalate ceramics (RENB/TaO) with lower thermal conductivity and meeting the use requirement of the thermal barrier coating in a high-temperature environment4) A thermal barrier coating.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a preparation method of a rare earth tantalate or niobate thermal barrier coating comprises the following steps:
step 1: taking more than two different rare earth tantalates (RETaO)4) Or niobate (RENbO)4) Mixing ceramic powder into n parts of mixed ceramic powder, wherein the volume fraction of at least one rare earth tantalate or niobate ceramic component in the n parts of mixed ceramic powder is continuously increased or decreased;
step 2: and (3) sequentially depositing the n parts of mixed ceramic powder obtained in the step (1) on a base material to obtain the multi-gradient rare earth tantalate or niobate thermal barrier coating.
The technical principle and the effect of the technical scheme are as follows:
1. in the scheme, a multi-gradient coating is obtained by designing more than two different rare earth tantalate or niobate ceramic powders, namely, the volume fraction of at least one ceramic component in the coating is continuously increased or continuously decreased, so that the thermal barrier coating can be ensured to have the original rare earth niobium/tantalate ceramic (RENB/TaO)4) The ceramic has high expansion coefficient and greatly reduced thermal conductivity, and the experimental detection shows that the thermal conductivity does not exceed 1.20 W.m-1·k-1And the requirement of the thermal barrier coating on low thermal conductivity is met.
2. The multi-element gradient ceramic coating with low thermal conductivity can be obtained in the scheme, the reason is that the components among the gradient coatings are in a gradual change form, so that the interfaces formed among the gradient coatings are few, the interface effect is weak, and the most important point is that the components of each layer can be continuously diffused in the deposition process of each gradient coating, so that the interface effect is continuously weakened, and the thermal conductivity is reduced.
Further, the thickness of the rare earth tantalate or niobate thermal barrier coating is 150-300 mu m.
Has the advantages that: experiments prove that the thickness of the multi-element gradient coating is set to be 150-300 mu m, and the thermal conductivity of the obtained thermal barrier coating is low.
Further, n in the step 1 is 6-21.
Has the advantages that: experiments prove that the number n of the gradient layers is set to be 6-21, so that the diffusion effect of components among the gradient layers is met, and the actual deposition process difficulty is met.
Further, a metal bonding layer with the thickness of 100-150 mu M is deposited on the surface of the base material in advance in the step 2, the component of the metal bonding layer is MCrAlY, and M is Ni or Co.
Has the advantages that: the arrangement of the metal bonding layer can improve the bonding property between the rare earth tantalate and the base material.
Further, the step 2 adopts APS, HVOF, EB-PVD or supersonic electric arc spraying method to carry out coating deposition treatment.
Has the advantages that: the preparation processes of the coatings are all existing mature processes and can be selected according to specific production environments.
Further, the preparation method of the rare earth tantalate or niobate powder comprises the following steps:
step 1: according to the structural formula RETaO4Or RENbO4Get RE2O3Dissolving the powder in concentrated nitric acid to a pH below 1.5, and adding TaOCl3Or NbOCl3Dropwise adding the solution, continuously stirring, simultaneously adding ammonia water to stabilize the pH of the system at 9-10, continuously stirring in a water bath environment, and sequentially adding absolute ethyl alcohol or deionized waterWashing the precipitate until the pH value is 7, placing the obtained filter cake in an oven for drying, then sieving and sintering at a medium temperature environment, and sieving the sintered powder again for later use;
step 2: mixing the powder prepared in the step 1 with water with the mass not less than 30 wt.% to obtain slurry A, mixing the slurry A with a binder, polyethylene glycol, n-octanol, a tackifier and a pore-increasing agent to obtain slurry B, and then sending the slurry B into a centrifugal spray dryer to carry out centrifugal spray granulation on the slurry B to obtain spherical rare earth tantalate or niobate powder with the powder particle size of 30-70 mu m.
Has the advantages that: the method for preparing the rare earth tantalum/niobate ceramic powder has the advantages of less time consumption, high purity, complete phase formation of the prepared rare earth tantalum/niobate powder, uniform components and small powder loss.
Further, TaOCl in the step 13The dropping speed of the solution is 200-400 mL/min, the temperature of the water bath is 50-100 ℃, the stirring time is 30-120 min, the drying temperature is 80-120 ℃, and the drying time is 5-10 h; the medium-temperature sintering temperature is 900-1100 ℃, the time is 3-5h, and the used sieve is 300-500 meshes.
Has the advantages that: the parameter setting can meet the requirement of preparing ceramic powder by a coprecipitation method.
Further, in the step 2, the content of the binder is 0.5-3 wt.%, the content of the additive is 0.1-1 wt.%, the feeding speed of the slurry B is controlled at 300-500 mL/h, and the spraying and centrifuging speed is 8000-10000 r/min.
Has the advantages that: such parameters ensure a homogeneous composition of the powder obtained.
Detailed Description
The following is further detailed by way of specific embodiments:
example 1:
preparation method of rare earth tantalate or niobate powder to prepare YNbO4For example, the method comprises the following steps:
step 1: according to YNbO4Structural formula (II) is2O3Dissolving in concentrated nitric acid for reaction, adjusting pH to about 1, and preparing NbOCl3Dropwise adding the solution (the dropping speed is 200mL/min), continuously stirring, simultaneously adding ammonia water to stabilize the pH of the system at 9-10, stirring for 1 hour, continuously stirring for 120min in a water bath environment at 60 ℃, then continuously washing and precipitating with deionized water until the pH is 7, placing the obtained filter cake in a drying oven at 120 ℃ for drying for 5 hours, then sieving with a 500-mesh sieve, sintering at 900 ℃ for 5 hours, and sieving the sintered powder with the 500-mesh sieve again for later use.
Step 2: mixing the powder prepared in the step 1 with 30 wt.% of water to obtain slurry A, uniformly mixing the slurry A with 0.5% of binder, 0.2% of polyethylene glycol, 0.1% of N-octyl alcohol and 0.1% of pore-forming agent to obtain slurry B, and then sending the slurry B into a centrifugal spray dryer to carry out centrifugal spray granulation on the slurry B, wherein the drying gas is N2The feeding speed is controlled at 350mL/h, the centrifugal speed is 9000r/min, and the inlet and outlet temperatures of a spray dryer are 350 ℃ and 170 ℃ respectively, so that the rare earth niobate (YNbO) with the powder particle size of 20-80 mu m can be obtained4) A spherical powder.
A preparation method of a rare earth tantalate or niobate thermal barrier coating comprises the following steps:
step 1: YNbO prepared by the method4And EuNbO4The powders were mixed to 6 parts of mixed ceramic powder as shown in Table 1.
Step 2: carrying out surface roughening treatment on a base material (nickel-based superalloy in the embodiment), then depositing a metal bonding layer with the thickness of 100 microns on the surface in advance, wherein the component of the metal bonding layer is NiCrAlY, and sequentially depositing 6 parts of mixed ceramic powder obtained in the step 1 on the metal bonding layer by adopting an APS (advanced photo-deposition system) method to obtain the multi-gradient rare earth niobate thermal barrier coating, wherein the thickness of the coating is 150 microns.
TABLE 1 YNbO in example 14And EuNbO4Volume fraction table of powder
| Number n of gradient layers | YNbO4Volume fraction (%) | EuNbO4Volume fraction (%) |
| 1 | 100 | 0 |
| 2 | 80 | 20 |
| 3 | 60 | 40 |
| 4 | 40 | 60 |
| 5 | 20 | 80 |
| 6 | 0 | 100 |
Example 2:
the difference from example 1 is that, referring to table 2, the number of gradient layers n is 11, the thickness of the rare earth niobate coating is 200 μm, and YNbO in each gradient layer4And EuNbO4The volume fractions of the powders are shown in table 2 below.
Table 2 shows YNbO in each gradient layer of example 24And EuNbO4Volume fraction table of powder
Example 3:
the difference from example 1 is that, referring to table 3, the number of gradient layers n of the ceramic coating layer was 21, the thickness of the rare earth niobate coating layer was 300 μm, and YNbO in each gradient layer4And EuNbO4The volume fractions of the powders are shown in table 3 below.
Table 3 shows YNbO in each gradient layer of example 34And EuNbO4Volume fraction table of powder
Example 4:
the difference from example 2 is that this example also includes ErNbO prepared by the method of example 14Powder and ScNbO4Powder, the number of gradient layers n is 11, the thickness of the rare earth niobate coating is 200 mu m, and YNbO in each gradient layer4、EuNbO4、ErNbO4And ScNbO4The volume fractions of the powders are shown in Table 4 below.
Table 4 shows the volume fraction (%)
| Number n of gradient layers | YNbO4 | EuNbO4 | ErNbO4 | ScNbO4 |
| 1 | 50 | 0 | 50 | 0 |
| 2 | 45 | 5 | 45 | 5 |
| 3 | 40 | 10 | 40 | 10 |
| 4 | 35 | 15 | 35 | 15 |
| 5 | 30 | 20 | 30 | 20 |
| 6 | 25 | 25 | 25 | 25 |
| 7 | 20 | 30 | 20 | 30 |
| 8 | 15 | 35 | 15 | 35 |
| 9 | 10 | 40 | 10 | 40 |
| 10 | 5 | 45 | 5 | 45 |
| 11 | 0 | 50 | 0 | 50 |
Example 5:
the difference from the embodiment 2 is thatIn the scheme, the ceramic powder is LaTaO4And DyTaO4The ceramic powder was prepared in the same manner as in example 1, with the number of gradient layers n being 11, the thickness of the rare earth tantalate coating layer being 200 μm, and the LaTaO in each gradient layer4And DyTaO4The volume fractions of the powders are shown in Table 5 below.
Table 5 shows LaTaO in each gradient layer of example 54And DyTaO4Volume fraction table of powder
| Number n of gradient layers | LaTaO4Volume fraction (%) | DyTaO4Volume fraction (%) |
| 1 | 100 | 0 |
| 2 | 90 | 10 |
| 3 | 80 | 20 |
| 4 | 70 | 30 |
| 5 | 60 | 40 |
| 6 | 50 | 50 |
| 7 | 40 | 60 |
| 8 | 30 | 70 |
| 9 | 20 | 80 |
| 10 | 10 | 90 |
| 11 | 0 | 100 |
Example 6:
the difference from example 4 is that the ceramic powder in this case is YTaO4、ErTaO4、HoTaO4And ScTaO4The ceramic powder was prepared in the same manner as in example 1, with the number of gradient layers n being 11, the thickness of the rare earth tantalate coating layer being 200 μm, and YNbO in each gradient layer4、EuNbO4、ErNbO4And ScNbO4The volume fractions of the powders are shown in Table 6 below.
Table 6 shows the volume fraction (%)
Comparative example 1:
the difference from the example 1 is that the rare earth niobate ceramic powder in the comparative example 1 is formed by high-temperature sintering after ball milling.
Comparative example 2:
the difference from example 1 is that YNbO is first introduced in step 24Depositing the powder onto the metal bonding layer by APS method to obtain coating A, and adding EuNbO4The powder was deposited on coating A by the APS method to give coating B, the total thickness of coating A and coating B being 150. mu.m.
Selecting the material test pieces obtained in the examples 1-6 and the comparative examples 1-2 to perform thermal conductivity experiment detection:
the test is carried out by using a laser thermal conductivity meter, and the test results are shown in the following table 7 at the temperature of 800K:
table 7 shows the thermal conductivities (W.m) of examples 1 to 6 and comparative examples 1 to 2-1·K-1)
From table 7 above, it follows:
1. the thermal conductivity of the rare earth tantalate or niobate ceramic coating obtained by the technical scheme in the application is not more than 1.20 W.m-1·K-1The requirement of the thermal barrier coating on low thermal conductivity is met, and the comparative example shows that the thermal conductivity of the ceramic coating without component design is obviously higher, and the thermal conductivity of the rare earth niobate powder obtained by high-temperature sintering meets the requirement of the thermal barrier coating, but is still higher than that of the ceramic powder prepared by adopting a coprecipitation method in the application.
2. By designing different rare earth tantalate or niobate ceramic powders, a multi-element gradient coating is obtained, i.e. the volume fraction of at least one ceramic component in the coating is continuously changed in such a way thatCan ensure that the thermal barrier coating has the original rare earth tantalate or niobate (RENB/TaO)4) The thermal barrier coating obtained by deposition in such a way has gradually changed components among the gradient coatings, and the interface formed among the gradient coatings is few, so that the interface effect is weak, and the most important point is that the components of each layer can be continuously diffused in the deposition process of each gradient coating, so that the interface effect is continuously weakened, and the thermal conductivity is reduced, but the thermal conductivity of the embodiment 3 in the application is the lowest, which means that the higher the number of gradient layers is, the more remarkable the improvement of the thermal conductivity is.
The foregoing is merely an example of the present invention and common general knowledge of the known specific materials and characteristics thereof has not been described herein in any greater extent. It should be noted that, for those skilled in the art, without departing from the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (8)
1. A preparation method of a rare earth tantalate or niobate thermal barrier coating comprises the following steps:
step 1: taking more than two different rare earth tantalates (RETaO)4) Or niobate (RENbO)4) Mixing ceramic powder into n parts of mixed ceramic powder, wherein the volume fraction of at least one rare earth tantalate or niobate ceramic component in the n parts of mixed ceramic powder is continuously increased or decreased;
step 2: and (3) sequentially depositing the n parts of mixed ceramic powder obtained in the step (1) on a base material to obtain the multi-gradient rare earth tantalate or niobate thermal barrier coating.
2. The method for preparing a rare earth tantalate or niobate thermal barrier coating of claim 1, wherein: the thickness of the rare earth tantalate or niobate thermal barrier coating is 150-300 mu m.
3. The method for preparing a rare earth tantalate or niobate thermal barrier coating of claim 1, wherein: in the step 1, n is 6-21.
4. The method for preparing a rare earth tantalate or niobate thermal barrier coating of claim 1, wherein: and in the step 2, a metal bonding layer with the thickness of 100-150 mu M is deposited on the surface of the base material in advance, wherein the metal bonding layer comprises MCrAlY, and M is Ni or Co.
5. The method for preparing a rare earth tantalate or niobate thermal barrier coating of claim 1, wherein: and in the step 2, the coating deposition treatment is carried out by adopting an APS, HVOF, EB-PVD or supersonic speed electric arc spraying method.
6. The method for preparing a rare earth tantalate or niobate thermal barrier coating of claim 1, wherein: the preparation method of the rare earth tantalate or niobate powder comprises the following steps:
step 1: according to the structural formula RETaO4Or RENbO4Get RE2O3Dissolving the powder in concentrated nitric acid to a pH below 1.5, and adding TaOCl3Or NbOCl3Dropwise adding the solution, continuously stirring, simultaneously adding ammonia water to stabilize the pH value of the system to 9-10, continuously stirring in a water bath environment, sequentially washing and precipitating with absolute ethyl alcohol or deionized water until the pH value is 7, placing the obtained filter cake in an oven for drying, then sieving and sintering in a medium-temperature environment, and sieving the sintered powder again for later use;
step 2: mixing the powder prepared in the step 1 with water with the mass not less than 30 wt.% to obtain slurry A, mixing the slurry A with a binder, polyethylene glycol, n-octanol, a tackifier and a pore-increasing agent to obtain slurry B, and then sending the slurry B into a centrifugal spray dryer to carry out centrifugal spray granulation on the slurry B to obtain spherical rare earth tantalate or niobate powder with the powder particle size of 30-70 mu m.
7. The method for preparing a rare earth tantalate or niobate thermal barrier coating of claim 6, wherein: in step 1, TaOCl3The dropping speed of the solution is 200-400 mL/min, the temperature of the water bath is 50-100 ℃, the stirring time is 30-120 min, the drying temperature is 80-120 ℃, and the drying time is 5-10 h; the medium-temperature sintering temperature is 900-1100 ℃, the time is 3-5h, and the used sieve is 300-500 meshes.
8. The method for preparing a rare earth tantalate or niobate thermal barrier coating of claim 6, wherein: in the step 2, the content of the binder is 0.5-3 wt.%, the content of the additive is 0.1-1 wt.%, the feeding speed of the slurry B is controlled to be 300-500 mL/h, and the spraying and centrifuging speed is 8000-10000 r/min.
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