CN107254652A - A kind of multilayer thermal barrier coating and preparation method thereof - Google Patents
A kind of multilayer thermal barrier coating and preparation method thereof Download PDFInfo
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- CN107254652A CN107254652A CN201710509404.7A CN201710509404A CN107254652A CN 107254652 A CN107254652 A CN 107254652A CN 201710509404 A CN201710509404 A CN 201710509404A CN 107254652 A CN107254652 A CN 107254652A
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- 8ysz
- barrier coating
- thermal barrier
- multilayer thermal
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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
-
- 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
Abstract
The invention belongs to alloy coat preparation field, and in particular to a kind of multilayer thermal barrier coating and preparation method thereof.The multilayer thermal barrier coating includes from the bottom to top：Tack coat, 8YSZ ceramic layers and Al2O3/ 8YSZ composite coatings；Wherein Al2O3In/8YSZ composite coatings, Al2O3Mass fraction be that 10% ~ 50%, 8YSZ is 50% ~ 90%.The multilayer thermal barrier coating has good resistance to high temperature oxidation, anti-thermal shock combination property, and cost of material is relatively low, and preparation technology is simple.
Description
Technical field
The invention belongs to alloy coat preparation field, and in particular to a kind of multilayer thermal barrier coating and preparation method thereof.
Background technology
In recent years, for raising aero-engine thrust and the thermal efficiency of fuel, the inlet temperature of Aeroengine Design
Up to 1700 DEG C, the operating temperature of the high-temperature component such as blade also reaches 1200 DEG C or so, significantly larger than advanced nickel base superalloy
The operating temperature that can be born（1000℃）.To solve this problem, one layer of thermal barrier coating is prepared in blade surface, high temperature can be closed
100-300 DEG C is reduced between gold surface and high-temperature fuel gas.Thermal barrier coating can not only improve blade resistance to high temperature corrosion ability, extension
Its service life, can also improve the temperature of engine, improve operating efficiency, be widely used in the fields such as aero-engine.
Current most widely used thermal barrier coating is made up of metal bonding coating and insulating ceramic layer two-layer system.During high-temperature service, metal
Tack coat and the oxygen reaction generation thermal growth oxide through ceramic layer（thermally grown oxide TGO）, as heat
One major reason of barrier coating failure.In addition, external corrosion medium（Such as CMAS）Burnt with ceramic layer reaction and ceramic layer
Knot is also to cause the major reason of the too early spalling failure of thermal barrier coating.To solve thermal barrier coating premature failure caused by above reason
Problem, the thermal barrier coating life-span is extended as study hotspot using multi-layer composite coatings technology and special preparation method.It is Chinese special
Profit（Application number：201110021402.6）Disclose a kind of with Al2O3The multilayer thermal barrier coating of confining bed, it is by surface A l2O3
Confining bed, the first ceramic layer, the second ceramic layer and tack coat composition, improve corrosion and heat resistant.But top layer Al2O3Confining bed heat
The coefficient of expansion is 8.0 × 10-6 M/K, and the second ceramic layer ZrO2Thermal coefficient of expansion is 11~13 × 10-6M/K, both thermal expansions
Coefficient difference is larger, causes Al because thermal coefficient of expansion difference produces larger thermal mismatch stress when under arms2O3Confining bed is peeled off,
And preparation technology is complicated.Chinese patent（Application number：200910218772.1）Disclose a kind of thermal barrier coating and its preparation side
Method, is characterized in using multilayer system, is made up of, has insulating ceramic layer, gradient-structure layer, break-resisting structure layer and tack coat
The characteristics of good resistance to fracture and extension life-span, but the coating architecture and preparation technology are complicated, and raw material obtains difficult, system
Standby coating system cost is too high.
The content of the invention
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to propose a kind of multilayer thermal barrier coating and preparation method thereof.
The coating structure has good resistance to high temperature oxidation, anti-thermal shock combination property, and cost of material is relatively low, and preparation technology is simple.
To achieve these goals, the technical solution adopted by the present invention is：
A kind of multilayer thermal barrier coating, the multilayer thermal barrier coating includes from the bottom to top：Tack coat, 8YSZ ceramic layers and Al2O3/8YSZ
（8mol%Y2O3Stable ZrO2）Composite coating；Wherein Al2O3In/8YSZ composite coatings, Al2O3Mass fraction for 10% ~
50%, 8YSZ are 50% ~ 90%.
It is preferred that, described Al2O3In/8YSZ composite coatings, Al2O3Mass fraction for 25%, 8YSZ be 75%.
The thickness of tack coat is 50~150 μm in described multilayer thermal barrier coating, and the thickness of 8YSZ ceramic layers is 50~150
μm, Al2O3The thickness of/8YSZ composite coatings is 100~150 μm.
A kind of method for preparing multilayer thermal barrier coating as described above, comprises the following steps：
1）8YSZ powder and alumina powder are mixed by certain mass ratio, is placed in after being mixed 12 hours in ball mill and is combined
Powder；
2）Purified treatment and blasting treatment are carried out to high temperature alloy matrix surface, it is standby；
3）Using heat spraying method in step 2）Pretreated matrix surface sprays one layer of tack coat, and thermal spraying is then used again
Method sprays 8YSZ ceramic layers on tack coat, finally by step 1）Obtained composite powder thermal jet is applied on 8YSZ ceramic layers,
Form Al2O3/ 8YSZ composite coatings；Produce multilayer thermal barrier coating.
Step 2）Described purified treatment is specially：To high temperature alloy matrix mechanical grinding scale removal, it is then placed in
Soaked 30 minutes in 50~70g/LNaOH solution, carry out oil removal treatment.
Step 1）The particle diameter of middle alumina powder is 25~45 μm, and the particle diameter of 8YSZ powder is 45~75 μm.
Preferably, described plasma spray technology includes but is not limited to plasma spraying, HVAF etc..
Described each layer coating layer thickness can change according to practice place.
The thermal barrier coating of the present invention has excellent high temperature oxidation resistance and corrosion resistance, as shown in figure 1, top layer is
Al2O3/ 8YSZ composite coatings, Al2O3Excellent high temperature resistant, wear-resisting and anti-thermal shock synthesis can be obtained by being mixed with both 8YSZ
Performance.Al in the layer first2O3With preferable compactness, it can effectively stop that oxygen and external corrosion medium spread into coating
In case coating is because occurring oxidation or corrosion and Al in premature failure, and composite bed2O3There is preferable wearability.Secondly after spraying
This layer has more vertical crack, considerably increases the strain tolerance limit of coating, hence it is evident that improve the thermal shock resistance of coating.To subtract
Small top layer Al2O3The thermal mismatch stress that/8YSZ composite beds are produced with metal bonding coating by coefficient of thermal expansion differences, in top layer Al2O3/
8YSZ ceramic layers are sprayed between 8YSZ composite coatings and metal bonding coating, are alleviated because both thermal coefficient of expansions mismatch the heat produced
Mismatch stress.The novel multi-layer thermal barrier coating has good resistance to high temperature oxidation, anti-thermal shock combination property, and cost of material is relatively low,
Preparation technology is simple.
The remarkable advantage of the present invention is：
Coating raw material are commercial micron powder, and source is wide, and cost is low, and preparation technology is simple.The coating of preparation is combined
Intensity is high, the Al on surface2O3/ 8YSZ composite ceramic layers are fine and close, can effectively prevent oxygen and corrosive medium from being spread into coating, greatly
The big high temperature oxidation resistance for improving coating, and top layer Al2O3/ 8YSZ composite coatings have certain amount vertical crack, increase
The strong strain tolerance limit of coating, improves its thermal shock resistance, surface A l2O3Set between/8YSZ composite ceramic layers and metal bonding coating
Putting 8YSZ ceramic layers has both thermal mismatch stress effects of alleviation, effectively extends the life-span of thermal barrier coating, can be widely used for
Various high-temperature heat-resistance parts.
Brief description of the drawings
Fig. 1 is multilayer thermal barrier coating structural representation of the present invention；1- matrix materials, 2- tack coats, 3-8YSZ ceramic layers, 4-
Al2O3/ 8YSZ composite ceramic layers；
Fig. 2 is Al in the embodiment of the present invention 12O3/ 8YSZ composite ceramic layer microstructure electron microscopes；
Fig. 3 is the resistance to high temperature oxidation of three embodiments of multilayer thermal barrier coating proposed by the present invention and conventional double structure thermal barrier coating
Performance comparison figure；
Fig. 4 is the thermal shock lifetime pair of three embodiments of multilayer thermal barrier coating proposed by the present invention and conventional double structure thermal barrier coating
Than figure.
Embodiment
The present invention is described in more detail for embodiment below in conjunction with the accompanying drawings, it should be pointed out that embodiment described below
It is intended to be easy to the understanding of the present invention, and does not play any restriction effect to it.
Embodiment 1
A kind of multilayer thermal barrier coating and preparation method thereof, comprises the following steps：
Step 1）：By 8YSZ powder（75wt%）And alumina powder（25wt%）Mixing, 45~75 μm of 8YSZ powder diameters scope,
25~45 μm of alumina powder particle size range, mixed-powder is placed in after being mixed 12 hours in planetary ball mill and obtains composite powder
End；
Step 2）：Inconel718 high temperature alloys matrix surface is subjected to purified treatment, specific purified treatment condition is：To substrate
Mechanical grinding scale removal, is then placed in the NaOH solution that concentration is 60g/L and soaks 30 minutes, carry out oil removal treatment；So
Blasting treatment is carried out to high temperature alloy matrix surface afterwards, is that thermal spraying is prepared；
Step 3）：Step 2 is coated in using plasma spray）It is 100 μm that one layer of average thickness is prepared in substrate after processing
Then NiCoCrAlY tack coats, 38~75 μm of NiCoCrAlY powder diameters scope is coated in above-mentioned gained using plasma spray again
Tack coat to carry out spraying average thickness be 100 μm of 8YSZ ceramic layers；Plasma spraying is finally used by step 1）Processing
Composite powder is sprayed on the 8YSZ ceramic layers of above-mentioned gained, and average thickness is 150 μm of Al2O3/ 8YSZ composite ceramic layers, i.e.,
Obtain Multi-layer structure thermal barrier coating.
Each specific spray parameters of layer are shown in Table 1.
The plasma spray coating process parameter of table 1
slm*=Standard litres per minute
Multilayer thermal barrier coating prepared by above-mentioned technique is well combined, surface A l2O3/ 8YSZ composite ceramics layer porosities are only 2%.
By the multilayer thermal barrier coating of above-mentioned preparation and traditional double-decker thermal barrier coating in 1100 DEG C of resistance furnace high-temperature oxydations 200 hours
After find, in multilayer thermal barrier coating tack coat high-temperature oxydation generate thermal growth oxide（Thermally Grown Oxides
Abbreviation TGO）Average thickness is 7.1 μm, and TGO average thickness is 8.9 μm in conventional double structure thermal barrier coating, shows the present invention
The multilayer thermal barrier coating of design has more excellent high temperature oxidation resistance.By the multilayer thermal barrier coating of above-mentioned preparation and traditional
Double-decker thermal barrier coating is put into temperature for 1000 DEG C of resistance furnace inside holdings 15 minutes, takes out sample and is put into water and is quickly cooled to
Room temperature, so circulation carry out thermal shock test.As a result show, present invention design multilayer thermal barrier coating thermal shock lifetime is 103 times, with biography
Comparatively speaking the double-decker thermal barrier coating thermal boundary life-span of system improves 41 times for 62 times, analyzes its reason for Al2O3/ 8YSZ is combined
There is more vertical crack in ceramic layer so as to add the strain tolerance limit of coating, in Al2O3/ 8YSZ composite ceramic layers are with gluing
8YSZ ceramic layers are set effectively to reduce thermal mismatch stress between knot layer, so as to improve multilayer thermal barrier coating thermal shock resistance.On
State result of the test and show that there is the multilayer thermal barrier coating of the invention designed more excellent high temperature oxidation resistance and thermal shock resistance to integrate
Performance.
Embodiment 2
A kind of multilayer thermal barrier coating and preparation method thereof, comprises the following steps：
Step 1）：By 8YSZ powder（90wt%）And alumina powder（10wt%）Mixing, 45~75 μm of 8YSZ powder diameters scope,
25~45 μm of alumina powder particle size range, mixed-powder is placed in after being mixed 12 hours in planetary ball mill and obtains composite powder
End；
Step 2）：Inconel718 high temperature alloys matrix surface is subjected to purified treatment, specific purified treatment condition is：To substrate
Mechanical grinding scale removal, is then placed in the NaOH solution that concentration is 60g/L and soaks 30 minutes, carry out oil removal treatment；So
Blasting treatment is carried out to high temperature alloy matrix surface afterwards, is that thermal spraying is prepared；
Step 3）：Step 2 is coated in using plasma spray）It is 100 μm that one layer of average thickness is prepared in substrate after processing
Then NiCoCrAlY tack coats, 38~75 μm of NiCoCrAlY powder diameters scope is coated in above-mentioned gained using plasma spray again
Tack coat to carry out spraying average thickness be 100 μm of 8YSZ ceramic layers；Plasma spraying is finally used by step 1）Processing
Composite powder is sprayed on the 8YSZ ceramic layers of above-mentioned gained, and average thickness is 150 μm of Al2O3/ 8YSZ composite ceramic layers, i.e.,
Obtain Multi-layer structure thermal barrier coating.
The multilayer thermal barrier coating of above-mentioned preparation is well combined, Al2O3There is more vertical fissure in/8YSZ composite ceramic layers
Line.The experiment of the identical resistance to high temperature oxidation of embodiment 1 and thermal shock test are carried out to the multilayer thermal barrier coating of above-mentioned preparation, find to pass through
TGO average thickness is 7.5 μm after 200 hours high-temperature oxydations, less than conventional double structure thermal barrier coating TGO average thickness.It is above-mentioned
The multilayer thermal barrier coating thermal shock lifetime of preparation is 81 times, is improved 19 times compared with conventional double thermal barrier coating thermal shock lifetime.
Embodiment 3
A kind of multilayer thermal barrier coating and preparation method thereof, comprises the following steps：
Step 1）：By 8YSZ powder（50wt%）And alumina powder（50wt%）Mixing, 45~75 μm of 8YSZ powder diameters scope,
25~45 μm of alumina powder particle size range, mixed-powder is placed in after being mixed 12 hours in planetary ball mill and obtains composite powder
End；
Step 2）：Inconel718 high temperature alloys matrix surface is subjected to purified treatment, specific purified treatment condition is：To substrate
Mechanical grinding scale removal, is then placed in the NaOH solution that concentration is 60g/L and soaks 30 minutes, carry out oil removal treatment；So
Blasting treatment is carried out to high temperature alloy matrix surface afterwards, is that thermal spraying is prepared；
Step 3）：Step 2 is coated in using plasma spray）It is 100 μm that one layer of average thickness is prepared in substrate after processing
Then NiCoCrAlY tack coats, 38~75 μm of NiCoCrAlY powder diameters scope is coated in above-mentioned gained using plasma spray again
Tack coat to carry out spraying average thickness be 100 μm of 8YSZ ceramic layers；Plasma spraying is finally used by step 1）Processing
Composite powder is sprayed on the 8YSZ ceramic layers of above-mentioned gained, and average thickness is 150 μm of Al2O3/ 8YSZ composite ceramic layers, i.e.,
Obtain Multi-layer structure thermal barrier coating.
The multilayer thermal barrier coating of above-mentioned preparation is well combined, Al2O3There is more vertical fissure in/8YSZ composite ceramic layers
Line.The experiment of the identical resistance to high temperature oxidation of embodiment 1 and thermal shock test are carried out to the multilayer thermal barrier coating of above-mentioned preparation, find to pass through
TGO average thickness is 6.5 μm after 200 hours high-temperature oxydations, less than conventional double structure thermal barrier coating TGO average thickness.It is above-mentioned
The multilayer thermal barrier coating thermal shock lifetime of preparation is 67 times, is improved 5 times compared with conventional double thermal barrier coating thermal shock lifetime.Due to compound
Quality of alumina fraction has reached 50% in coating, causes Al2O3/ 8YSZ composite ceramic layers and 8YSZ ceramic layer thermal coefficient of expansions
Difference will be big compared to both difference of thermal expansion coefficient in Examples 1 and 2, for embodiment 1 and embodiment 2, thermal shock
Life-span decreases.
The foregoing is only presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, should all belong to the covering scope of the present invention.
Claims (6)
1. a kind of multilayer thermal barrier coating, it is characterised in that：The multilayer thermal barrier coating includes from the bottom to top：Tack coat, 8YSZ ceramics
Layer and Al2O3/ 8YSZ composite coatings；Wherein Al2O3In/8YSZ composite coatings, Al2O3Mass fraction be for 10% ~ 50%, 8YSZ
50%~90%。
2. multilayer thermal barrier coating according to claim 1, it is characterised in that：Described Al2O3In/8YSZ composite coatings,
Al2O3Mass fraction for 25%, 8YSZ be 75%.
3. multilayer thermal barrier coating according to claim 1 or 2, it is characterised in that：The thickness of tack coat is 50~150 μm,
The thickness of 8YSZ ceramic layers is 50~150 μm, Al2O3The thickness of/8YSZ composite coatings is 100~200 μm.
4. a kind of method for preparing multilayer thermal barrier coating as claimed in claim 1 or 2, it is characterised in that：Comprise the following steps：
1）8YSZ powder and alumina powder are mixed by certain mass ratio, is placed in after being mixed 12 hours in ball mill and is combined
Powder；
2）Purified treatment and blasting treatment are carried out to high temperature alloy matrix surface, it is standby；
3）Using heat spraying method in step 2）Pretreated matrix surface sprays one layer of tack coat, and thermal spraying is then used again
Method sprays 8YSZ ceramic layers on tack coat, finally by step 1）Obtained composite powder thermal jet is applied on 8YSZ ceramic layers,
Form Al2O3/ 8YSZ composite coatings；Produce multilayer thermal barrier coating.
5. the method according to claim 4 for preparing multilayer thermal barrier coating, it is characterised in that：Step 2）At described purification
Reason is specially：To high temperature alloy matrix mechanical grinding scale removal, it is then placed in 50~70g/LNaOH solution and soaks 30 points
Clock, carries out oil removal treatment.
6. the method according to claim 4 for preparing multilayer thermal barrier coating, it is characterised in that：Step 1）Middle alumina powder
Particle diameter be 25~45 μm, the particle diameter of 8YSZ powder is 45~75 μm.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107904559A (en) * | 2017-12-21 | 2018-04-13 | 福州大学 | A kind of interior heating evaporation boat with composite ceramic coat and preparation method thereof |
| CN108048779A (en) * | 2017-12-21 | 2018-05-18 | 福州大学 | The preparation method of interior heating evaporation basket with resistance to molten aluminum corrosion composite ceramic coat |
| CN109765119A (en) * | 2019-01-14 | 2019-05-17 | 北京工业大学 | It is a kind of for measuring the device in situ of thermal barrier coating system surface thermal stress |
| CN109972070A (en) * | 2019-04-25 | 2019-07-05 | 北京科技大学 | A kind of metallic composite and its preparation process of surface coating protective coating |
| CN112095066A (en) * | 2020-04-29 | 2020-12-18 | 周俊 | Hot spraying product and method for new material |
| CN113388801A (en) * | 2021-06-18 | 2021-09-14 | 北京理工大学 | Thermal barrier coating with composite double-ceramic-layer structure and preparation method thereof |
| CN114616220A (en) * | 2019-12-26 | 2022-06-10 | 阿塞尔桑电子工业及贸易股份公司 | Method for producing a multilayer ceramic structure by thermal spraying |
| CN115449786A (en) * | 2022-09-13 | 2022-12-09 | 西安热工研究院有限公司 | Thermal barrier coating and preparation method and application thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107904559A (en) * | 2017-12-21 | 2018-04-13 | 福州大学 | A kind of interior heating evaporation boat with composite ceramic coat and preparation method thereof |
| CN108048779A (en) * | 2017-12-21 | 2018-05-18 | 福州大学 | The preparation method of interior heating evaporation basket with resistance to molten aluminum corrosion composite ceramic coat |
| CN107904559B (en) * | 2017-12-21 | 2019-11-12 | 福州大学 | A kind of interior heating evaporation boat and preparation method thereof with composite ceramic coat |
| CN109765119A (en) * | 2019-01-14 | 2019-05-17 | 北京工业大学 | It is a kind of for measuring the device in situ of thermal barrier coating system surface thermal stress |
| CN109765119B (en) * | 2019-01-14 | 2021-11-26 | 北京工业大学 | In-situ device for measuring thermal stress on surface of thermal barrier coating system |
| CN109972070A (en) * | 2019-04-25 | 2019-07-05 | 北京科技大学 | A kind of metallic composite and its preparation process of surface coating protective coating |
| CN114616220A (en) * | 2019-12-26 | 2022-06-10 | 阿塞尔桑电子工业及贸易股份公司 | Method for producing a multilayer ceramic structure by thermal spraying |
| CN112095066A (en) * | 2020-04-29 | 2020-12-18 | 周俊 | Hot spraying product and method for new material |
| CN113388801A (en) * | 2021-06-18 | 2021-09-14 | 北京理工大学 | Thermal barrier coating with composite double-ceramic-layer structure and preparation method thereof |
| CN115449786A (en) * | 2022-09-13 | 2022-12-09 | 西安热工研究院有限公司 | Thermal barrier coating and preparation method and application thereof |
| CN115449786B (en) * | 2022-09-13 | 2023-07-28 | 西安热工研究院有限公司 | Thermal barrier coating and preparation method and application thereof |
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Application publication date: 20171017 |