CN108342678A - Thermal barrier coating and preparation method thereof with structure gradient - Google Patents
Thermal barrier coating and preparation method thereof with structure gradient Download PDFInfo
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- CN108342678A CN108342678A CN201810214053.1A CN201810214053A CN108342678A CN 108342678 A CN108342678 A CN 108342678A CN 201810214053 A CN201810214053 A CN 201810214053A CN 108342678 A CN108342678 A CN 108342678A
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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
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
- C23C4/073—Metallic material containing MCrAl or MCrAlY alloys, where M is nickel, cobalt or iron, with or without non-metal elements
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
- C23C4/11—Oxides
Abstract
The invention discloses a kind of thermal barrier coating and preparation method thereof with structure gradient.Matrix, adhesive layer and the ceramic topcoats that the thermal barrier coating is set gradually from bottom to up, wherein, the microstructure of the ceramic topcoats changes in gradient, by setting gradually quasi- column structure ceramics bottom, stratiform and column mixed structure ceramic interlayer and fine and close laminated structure ceramics top layer from bottom to up.The disposable continuous preparation of the thermal barrier coating can be realized by ultralow pressure plasma multiphase deposition method.The thermal barrier coating of preparation has the feature performance benefits such as high heat-insulated, long-life, stronger anticorrosive and antiscour.
Description
Technical field
Thermal Barrier Coating Technologies being prepared with ultralow pressure plasma physics multiphase deposition method the present invention relates to a kind of, more particularly to
A kind of thermal barrier coating and preparation method thereof with structure gradient.
Background technology
Thermal barrier coating (Thermal barrier coatings, TBCs) technology be typically high temperature resistant, low-heat are led, anti-corruption
The ceramic material of erosion is mutually compound with coating way and metallic matrix, anti-with a kind of heat for reducing metallic surface temperature under hot environment
Shield technology.It is sent out currently, Thermal Barrier Coating Technologies become aviation with high-temperature structural material technology, efficient air film cooling technology side by side
Three big key technologies of motivation high-pressure turbine blade.
Typical thermal barrier coating is mainly constituted by two layers at present：Centre is that metal bonds transition zone (Bond Coat, BC),
Antioxidation is played, common used material is MCrAlY (M:Ni, Co or Ni+Co)；Outer layer has been the ceramic topcoats of heat-blocking action, at present
Most common material be yttria-stabilized zirconia (Yttria stabilized zirconia, YSZ), but be difficult to higher than
It is used for a long time at a temperature of 1200 DEG C.Some scholars have researched and developed the thermal barrier coating ceramic material that can be used for more operation at high temperature,
Such as zirconates of Gd, Eu, Sm, Nd and La with pyrochlore constitution, the La with fluorite structure2Ce2O7Deng.Thermal boundary applies at present
Ceramic topcoats in layer are mainly prepared and are formed by plasma spraying technology/electro beam physics vapour deposition technology.Two methods are each
There are pros and cons.Plasma spraying technology is mainly to form stratiform structure coating, the layer using the droplets pack of fusing or semi-molten
Shape structure coating thermal conductivity is relatively low, can meet its heat-insulated functional requirement, but anchoring strength of coating is general, heat resistanceheat resistant cycle life compared with
Difference.Electro beam physics vapour deposition technology is then under vacuum conditions, to heat target using the electron beam of high-energy density, make it
Hydatogenesis forms coating, can get specific columnar crystal structure, and coating has higher strain tolerance, compares plasma spraying
Thermal barrier coating, heat shock resistance service life significantly improve, but this structure coating thermal conductivity is higher.
The ultralow pressure plasma physics multiphase deposition technique newly risen in recent years has both plasma spraying and electro beam physics
The advantages of vapor deposition, may be implemented solid phase, the multiphase of liquid and gas deposition, prepare stratiform, quasi- column or mixed structure
Coating, especially quasi- column structure coating show good thermal shock resistance.But the structure column crystal is coarse, column crystal
Gap and defect are also more, so that its hot corrosion resistance and scour resistance do not improve a lot.
Invention content
The object of the present invention is to provide a kind of high heat-insulated, long-life, it is stronger anticorrosive and antiscour have structure gradient
Thermal barrier coating and preparation method thereof.
The purpose of the present invention is what is be achieved through the following technical solutions：
The multilayer thermal barrier coating with structure gradient of the present invention, including the matrix, the adhesive layer that set gradually from bottom to up
And ceramic topcoats, the microstructure of the ceramic topcoats change in gradient, by setting gradually quasi- column structure ceramics from bottom to up
Bottom, stratiform and column mixed structure ceramic interlayer and fine and close laminated structure ceramics top layer.
The preparation method of the above-mentioned multilayer thermal barrier coating with structure gradient of the present invention, includes the following steps：
The first step prepares high temperature alloy matrix, and matrix passes through sandblasting pretreatment；
Second step prepares adhesive layer on the matrix；
Third step deposits structure gradient ceramic topcoats on the adhesive layer；
As seen from the above technical solution provided by the invention, the heat provided in an embodiment of the present invention with structure gradient
Barrier coating and preparation method thereof, since the microstructure of the ceramic topcoats changes in gradient, by setting gradually quasi- column from bottom to up
Shape structural ceramics bottom, stratiform and column mixed structure ceramic interlayer and fine and close laminated structure ceramics top layer.Pass through ultralow pressure
Plasma multiphase deposition method can realize the disposable continuous preparation of the thermal barrier coating.The thermal barrier coating of preparation have it is high it is heat-insulated,
The feature performance benefits such as long-life, stronger anticorrosive and antiscour.
Description of the drawings
Fig. 1 is the structural schematic diagram of the multilayer thermal barrier coating with structure gradient prepared by the embodiment of the present invention.
Specific implementation mode
The embodiment of the present invention will be described in further detail below.What is be not described in detail in the embodiment of the present invention is interior
Appearance belongs to the prior art well known to professional and technical personnel in the field.
The multilayer thermal barrier coating with structure gradient of the present invention, preferable specific implementation mode are：
Including the matrix, adhesive layer and ceramic topcoats set gradually from bottom to up, the microstructure of the ceramic topcoats is in
Graded, by set gradually from bottom to up quasi- column structure ceramics bottom, stratiform and column mixed structure ceramic interlayer and
Fine and close laminated structure ceramics top layer.
The bonding layer material is NiCoCrAlY or NiCoCrAlYX, one or more, the institute in X Hf, Ta, Si
The ceramic topcoats material stated is YSZ or GYb-YSZ, YSZ ZrO2+ (6~8wt%) Y2O3, GYb-YSZ is 5~10mol%
Gd2O3And Yb2O3The YSZ of codope.
The thickness of the quasi- column structure ceramics bottom is 60 μm~120 μm, layered and column mixed structure ceramics
The thickness of transition zone is 30 μm~50 μm, and the thickness of the densification laminated structure ceramics top layer is 10 μm~30 μm.
The porosity of the densification laminated structure ceramics top layer is~5%~20%.
The preparation method of the above-mentioned multilayer thermal barrier coating with structure gradient of the present invention, preferable specific embodiment party
Formula is：
Include the following steps：
The first step prepares high temperature alloy matrix, and matrix passes through sandblasting pretreatment；
Second step prepares adhesive layer on the matrix；
Third step deposits structure gradient ceramic topcoats on the adhesive layer；
The spraying method that the third step structure gradient ceramic topcoats use deposits for ultralow pressure plasma physics multiphase.
The third step structure gradient ceramic topcoats spraying powder used is ultra-fine grain diameter nanometer reunion powder, reunion powder
Grain size is 1~30 μm.
The third step structure gradient ceramic layer is mainly to be realized by regulating and controlling spray parameters, by changing powder feeding
Rate and spray distance are realized or are realized by changing spray power and spray distance.
The thermal barrier coating and preparation method thereof with structure gradient of the present invention, in existing adhesive layer/two layers of ceramic topcoats
On the basis of structure thermal barrier coating, the multilayer thermal barrier coating with structure gradient is prepared, advantage is：
1. the multilayer thermal barrier coating with structure gradient selects fine and close layer structure as ceramic top layer, it ensure that thermal boundary applies
The preferable anticorrosive and performance of flushing of layer, and ceramic of compact top layer can prevent oxygen from entering, and it is anti-oxidant to improve thermal barrier coating
Performance.
2. the multilayer thermal barrier coating with structure gradient selects quasi- column structure as ceramic bottom, make coating that there is higher
Strain tolerance, thermal cycle life is high.
3. the multilayer thermal barrier coating with structure gradient selects mixed structure as ceramic interlayer, stratiform can be effectively relieved
The thermal stress of structural ceramics top layer and quasi- column structure ceramics bottom mismatches, and ensures the good heat resistanceheat resistant cyclicity of thermal barrier coating
Energy.
4. gas phase, liquid phase, solid-phase heterogeneous can be achieved in preparation method provided by the invention-ultralow pressure plasma multiphase deposition
Composite deposition can control coating heterogeneous microstructure by controlling spray parameters, realize the primary of structure gradient ceramic layer
Property continuously prepare, simplify preparation process, and deposition efficiency is high.
5. the high preheating temperature of matrix may be implemented in ultralow pressure plasma multiphase deposition, adhesive layer and ceramic Coating combination are good
It is good.
Specific embodiment, as shown in Figure 1：
The first step prepares high temperature alloy matrix, and matrix passes through sandblasting pretreatment；
Second step prepares NiCoCrAlY adhesive layers on the matrix.
(A) low-voltage plasma spraying method is used to prepare NiCoCrAlY adhesive layers.Main technologic parameters are：Spray power
64KW, vacuum chamber pressure 35mbar, powder feeding rate 80g/min, spray distance 350mm, primary air amount Ar gas is 110L/min, H2Gas
Flow is 6L/min；
(B) supersonic flame spraying method is used to prepare NiCoCrAlY adhesive layers.Main technologic parameters are：Kerosene 25L/
H, oxygen 900L/min, chamber pressure 8.4bar, powder feeding rate 80g/min, spray distance 350mm.
The adhesive layer prepared is polished on 200#, 400#, 600#, 800# sand paper successively, it is spare.If preparing other materials
Adhesive layer is expected, such as NiCoCrAlYX (X：It is one or more in Hf, Ta, Si), then dusty spray used is changed to
NiCoCrAlYX powder.
Third step deposits YSZ structure gradient ceramic topcoats on the adhesive layer, more using ultralow pressure plasma physics
The mutually method of deposition.Powder used is YSZ nanometers of reunion powder of ultra-fine grain diameter, and reunion powder grain size is 1~30 μm.It is specific to prepare step
It is rapid as follows：
(1) it is installed to vacuum chamber after tooling being packed into adhesive layer sample, vacuum chamber pressure is evacuated to and is less than 1mbar；
(2) spray parameters are set:Plasma gas flow Ar 35slpm/He60slpm, spray power are 55~100KW,
Powder feeding 10~40g/min of rate, 800~1400mm of spray distance.Rifle is put in striking；
(3) sample is moved into plasma jet, sample is preheated using plasma jet, sample preheating temperature
It is required that reaching after temperature is raised to 800~1000 DEG C；
(4) powder feeder is opened, starts to spray.The structure gradient ceramic layer is mainly realized by regulating and controlling spray parameters
's.It can specifically be realized by changing powder feeding rate and spray distance, spray power can also be changed and spray distance is realized, specifically
It is as follows：
(A) regulate and control powder feeding rate and spray distance realizes structure gradient control
(A1) plasma gas flow Ar 35slpm/He60slpm, spray power 65KW, powder feeding rate are adjusted to first
10g/min, spray distance become 1100mm, and other parameters are constant, spray 10~20min, obtain the quasi- column of 50~100 μ m-thicks
Structural ceramics bottom；
(A2) powder feeding rate is adjusted to 25g/min after, and spray distance becomes 900mm, and other parameters are constant, and spraying 3~
4min obtains the stratiform and column mixed structure transition ceramic layer of 30~50 μ m-thicks；
(A3) last powder feeding rate is 40g/min, spray distance 800mm, sprays 2~3min, obtains 30~50 μ m-thicks
Fine and close stratiform ceramic top layer.
(B) regulation and control spraying and spray distance realize structure gradient control
(B1) plasma gas flow Ar 35slpm/He60slpm, powder feeding rate are 20g/min, and spray power is adjusted to
65KW, spray distance 1200mm, other parameters are constant, spray 10~20min, obtain the quasi- column structure of 50~100 μ m-thicks
Ceramic bottom；
(B2) spray power is adjusted to 55KW after, and spray distance 900mm, other parameters are constant, sprays 3~5min, obtains
To the stratiform and column mixed structure transition ceramic layer of 30~50 μ m-thicks；
(B3) last spray power is 45KW, spray distance 800mm, sprays 2~3min, obtains the cause of 30~50 μ m-thicks
Close ceramic layered top layer.
(5) after ceramic topcoats deposition, arc extinguishing
(6) it after vacuum chamber cooling, deflates, takes out sample
If preparing other structures graded ceramics layer, such as GYb-YSZ, dusty spray used is changed to ultra-fine grain diameter GYb-
YSZ agglomerated nanocrystalline powders, reunion powder grain size are 1~30 μm.It is same as above using spraying process and parameter.
Embodiment 1：Low-voltage plasma spraying NiCoCrAlYTa adhesive layers+ultralow pressure plasma on high temperature alloy matrix
Physics multiphase deposits YSZ structure gradient ceramic layers
The first step prepares high temperature alloy matrix, and matrix passes through sandblasting pretreatment；
Second step prepares NiCoCrAlYTa adhesive layers using low-voltage plasma spraying method.Main technologic parameters are：Spraying
Power 64KW, vacuum chamber pressure 35mbar, powder feeding rate 80g/min, spray distance 350mm, primary air amount Ar gas is 110L/min,
H2Throughput is 6L/min.The adhesive layer prepared is polished on 200#, 400#, 600#, 800# sand paper successively, it is spare.
Third step deposits YSZ structure gradient ceramic topcoats on the adhesive layer, more using ultralow pressure plasma physics
The mutually method of deposition.Powder used is YSZ nanometers of reunion powder of ultra-fine grain diameter, and reunion powder grain size is 1~30 μm..It is specific to prepare
Steps are as follows：
(1) it is installed to vacuum chamber after tooling being packed into adhesive layer sample, vacuum chamber pressure is evacuated to and is less than 1mbar；
(2) spray parameters are set:Plasma gas flow Ar 35slpm/He60slpm, spray power 65KW, powder feeding
10~40g/min of rate, 800~1400mm of spray distance.Rifle is put in striking；
(3) sample is moved into plasma jet, sample is preheated using plasma jet, sample preheating temperature
It is required that reaching after temperature is raised to 800~1000 DEG C；
(4) powder feeder is opened, starts to spray.Realize prepared by structure gradient by regulating and controlling powder feeding rate and spray distance, step
It is as follows：
A) plasma gas flow Ar 35slpm/He60slpm, spray power 65KW, powder feeding rate are adjusted to 10g/ first
Min, spray distance become 1100mm, and other parameters are constant, spray 20min, obtain the quasi- column structure ceramic bottom of~120 μ m-thicks
Layer；
B) powder feeding rate is adjusted to 25g/min after, and spray distance becomes 900mm, and other parameters are constant, sprays 4min, obtains
To the stratiform and column mixed structure transition ceramic layer of~40 μ m-thicks；
C) last powder feeding rate is 40g/min, spray distance 800mm, sprays 2min, obtains the fine and close stratiform of~30 μ m-thicks
Ceramic top layer.
(5) after ceramic topcoats deposition, arc extinguishing
(6) it after vacuum chamber cooling, deflates, takes out sample
The microstructure of the coating of the sample prepared, thickness, thermal shock resistance and scour resistance are analyzed
It measures.Adhesive layer thickness is 100 μm, and the thickness of the quasi- column structure ceramics bottom of YSZ coatings is~120 μm, and stratiform and column are mixed
It is 40 μm to close structural transition ceramic layer thickness, and the thickness of fine and close laminated structure ceramics top layer is 30 μm, fine and close laminated structure ceramics
Top layer porosity is 7%；Thermal cycle test in stove is carried out to sample, 1150 DEG C, keeps the temperature 5min, compressed air cools down the heat of 90s
Under cycling condition, coating thermal cycle life reaches 2500 times, has absolutely proved that sample has good thermal shock resistance.To coating
Scour resistance is detected, with reference to GE E50TF121 particle erosion standards, using 50 μm of Al2O3Particle washes away 20 ° of angle,
Distance 100mm, pressure 0.25MPa, under the conditions of erosion time 25s, erosion rate reaches~14s/mil.
Embodiment 2：On high temperature alloy matrix supersonic flame spraying NiCoCrAlYHfSi adhesive layers+ultralow pressure etc. from
Muon physics multiphase deposits GYb-YSZ structure gradient ceramic layers
The first step prepares high temperature alloy matrix, and matrix passes through sandblasting pretreatment；
Second step prepares NiCoCrAlYHfSi adhesive layers using supersonic flame spraying method.Main technologic parameters are：Coal
Oily 25L/h, oxygen 900L/min, chamber pressure 8.4bar, powder feeding rate 80g/min, spray distance 350mm.By what is prepared
Adhesive layer is polished on 200#, 400#, 600#, 800# sand paper successively, spare.
Third step deposits GYb-YSZ structure gradient ceramic topcoats on the adhesive layer, using ultralow pressure plasma object
The method for managing multiphase deposition.Powder used is GYb-YSZ nanometers of reunion powder of ultra-fine grain diameter, and reunion powder grain size is 1~30 μm.Tool
Preparation step is as follows：
(1) it is installed to vacuum chamber after tooling being packed into adhesive layer sample, vacuum chamber pressure is evacuated to and is less than 1mbar；
(2) spray parameters are set:Plasma gas flow Ar 35slpm/He60slpm, spray power are 55~100kw,
Powder feeding rate 20g/min, 800~1400mm of spray distance.Rifle is put in striking；
(3) sample is moved into plasma jet, sample is preheated using plasma jet, sample preheating temperature
It is required that reaching after temperature is raised to 800~1000 DEG C；
(4) powder feeder is opened, starts to spray.Realize prepared by structure gradient by regulating and controlling spraying and spray distance, step is such as
Under：
A) plasma gas flow Ar 35slpm/He60slpm, powder feeding rate are 20g/min, and spray power is adjusted to 65KW,
Spray distance is 1200mm, and other parameters are constant, sprays 10min, obtains the quasi- column structure ceramics bottom of 50 μ m-thicks；
B) spray power is adjusted to 55KW after, and spray distance 900mm, other parameters are constant, sprays 3min, obtains 30 μm
Thick stratiform and column mixed structure transition ceramic layer；
C) last spray power is 45KW, spray distance 800mm, sprays 2min, obtains the fine and close stratiform pottery of 30 μ m-thicks
Porcelain top layer.
(5) after ceramic topcoats deposition, arc extinguishing
(6) it after vacuum chamber cooling, deflates, takes out sample.
The microstructure of the coating of the sample prepared, thickness, thermal shock resistance and scour resistance are analyzed
It measures.Adhesive layer thickness is 100 μm, and the thickness of the quasi- column structure ceramics bottom of GYb-YSZ coatings is~50 μm, stratiform and column
Mixed structure transition ceramic layer thickness is 30 μm, and the thickness of fine and close laminated structure ceramics top layer is 30 μm, fine and close layer structure pottery
Porcelain top layer porosity is 5%；Thermal cycle test in stove is carried out to sample, 1150 DEG C, keeps the temperature 5min, compressed air cools down 90s's
Under thermal cycle conditions, coating thermal cycle life reaches 4000 times, has absolutely proved that sample has good thermal shock resistance.To applying
Layer scour resistance is detected, and washes away angle using 50 μm of alumina particles with reference to GE E50TF121 particle erosion standards
20 °, distance 100mm, pressure 0.25MPa, under the conditions of erosion time 25s, erosion rate reaches~15.0s/mil.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art is in the technical scope of present disclosure, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Subject to enclosing.
Claims (8)
1. a kind of multilayer thermal barrier coating with structure gradient, including the matrix, adhesive layer and the ceramics that set gradually from bottom to up
Face layer, which is characterized in that the microstructure of the ceramic topcoats changes in gradient, by setting gradually quasi- column structure from bottom to up
Ceramic bottom, stratiform and column mixed structure ceramic interlayer and fine and close laminated structure ceramics top layer.
2. the multilayer thermal barrier coating according to claim 1 with structure gradient, which is characterized in that the adhesive layer material
Material is NiCoCrAlY or NiCoCrAlYX, one or more in X Hf, Ta, Si, the ceramic topcoats material for YSZ or
GYb-YSZ, YSZ ZrO2+ (6~8wt%) Y2O3, GYb-YSZ is 5~10mol%Gd2O3And Yb2O3The YSZ of codope.
3. the multilayer thermal barrier coating according to claim 2 with structure gradient, which is characterized in that the quasi- column structure
The thickness of ceramic bottom is 60 μm~120 μm, and layered and column mixed structure ceramic interlayer thickness is 30 μm~50 μ
The thickness of m, the densification laminated structure ceramics top layer are 10 μm~30 μm.
4. the multilayer thermal barrier coating according to claim 3 with structure gradient, which is characterized in that the densification stratiform knot
The porosity of structure ceramic top layer is~5%~20%.
5. a kind of Claims 1-4 any one of them has the preparation method of the multilayer thermal barrier coating of structure gradient, feature
It is, includes the following steps：
The first step prepares high temperature alloy matrix, and matrix passes through sandblasting pretreatment；
Second step prepares adhesive layer on the matrix；
Third step deposits structure gradient ceramic topcoats on the adhesive layer.
6. the preparation method of the multilayer thermal barrier coating according to claim 5 with structure gradient, which is characterized in that third
The spraying method that the step structure gradient ceramic topcoats use deposits for ultralow pressure plasma physics multiphase.
7. the preparation method of the multilayer thermal barrier coating according to claim 5 with structure gradient, which is characterized in that third
The step structure gradient ceramic topcoats spraying powder used is ultra-fine grain diameter nanometer reunion powder, and reunion powder diameter is 1~30 μ
m。
8. the preparation method of the multilayer thermal barrier coating according to claim 5 with structure gradient, which is characterized in that third
The step structure gradient ceramic layer is mainly to be realized by regulating and controlling spray parameters, by changing powder feeding rate and spray distance
It realizes or is realized by changing spray power and spray distance.
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