CN108411242A - A kind of thermal barrier coating and preparation method thereof with anti-particle erosion superficial layer - Google Patents
A kind of thermal barrier coating and preparation method thereof with anti-particle erosion superficial layer Download PDFInfo
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- CN108411242A CN108411242A CN201810098619.9A CN201810098619A CN108411242A CN 108411242 A CN108411242 A CN 108411242A CN 201810098619 A CN201810098619 A CN 201810098619A CN 108411242 A CN108411242 A CN 108411242A
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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
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
- C23C4/11—Oxides
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Abstract
A kind of thermal barrier coating and preparation method thereof with anti-particle erosion superficial layer, the thermal barrier coating is the ceramic layer in feathery structure being arranged on matrix using plasma spraying physical gas-phase deposition, the upper end of the ceramic layer is high cohesive strength superficial layer, and the ceramic layer is located at the part below high cohesive strength superficial layer and is connected for no interface between high cohesive strength superficial layer, high cohesive strength superficial layer has material composition identical with the following ceramic layer of superficial layer, object phase and macroscopical feathery structure.The simple for process, at low cost of the present invention, anchoring strength of coating are high, and the thermal barrier coating with high cohesive strength superficial layer of preparation can increase substantially the anti-particle erosion performance of thermal barrier coating, and service life is long.
Description
Technical field
The invention belongs to Thermal Barrier Coating Technologies field, be related to a kind of thermal barrier coating with anti-particle erosion superficial layer and its
Preparation method.
Background technology
Thermal barrier coating（TBCs）It is using the superior high temperature resistant of ceramic material, anticorrosive and low heat conductivity energy, with coating
Mode is mutually compound with metallic matrix by ceramics, improves the temperature in use and oxidation-resistance property of hot-end component, extends hot junction portion
The service life of part improves a kind of surface protection technique of engine efficiency.Thermal insulation layer construction mainly has lamellar knot at present
Structure and columnar crystal structure, the former be mainly used for that temperature is relatively low or stationary parts on, be mechanical bond between coating and matrix, in conjunction with
Intensity is general, while lamellar structural strain tolerance is low, and coating is easy to peel off too early under thermal shock.The latter have column crystal it
Between gap so that coating is high to strain tolerance, and thermal cycle life is high.But the down suction between column crystal becomes heat and corrosion
The channel of medium, coating are heat-insulated low with corrosion resistance.
Plasma spraying-physical vapour deposition (PVD)（PS-PVD）Technology grows up on the basis of low-voltage plasma spraying
A kind of novel vapour deposition coating method.The thermal insulation layer construction of preparation is mainly a kind of feathery structure of similar column crystal.
The study found that there is feathery structure thermal barrier coating preferable comprehensive performance, heat-proof quality to be apparently higher than columnar crystal structure, connect
Nearly multi-layer sheet structure；Thermal cycle life is apparently higher than multi-layer sheet structure, close to column crystal coating.It will be appreciated, however, that PS-PVD systems
Standby feathery structure thermal barrier coating, low scour resistance is a short slab that can not be ignored, to be improved.
Erosion failure refer under the air-flow repeated action with hard particles, in the zone of action ceramic layer become it is closely knit from
And that there is a phenomenon where thickness is thinning, crackle forms even disbonding.Here there are two main classes in hard particles source, when
The particle that carbon particle formed in combustion process either engine combustion chamber interior walls, turbo blade etc. is formed by erosion；It is another
Class is from the external object being inhaled into, such as the grains of sand, dust, salt, metallic dust.During engine is on active service, due to used
Property power cause hard particles deviate gas flow to hit coating surface formation wash away, easily induce disbonding, cause to lose
Effect.And PS-PVD feathery structures ceramic layer can generate one and table after being hit extruding by foreign particles in ceramic layer
Face is at 450Shear band, crackle just from these place induce and grow, on the one hand it is extending transversely, on the one hand extend to ceramic layer
With the interface of adhesive layer.Meanwhile because thermally expanding thermal stress/energy that the factors such as mismatch and coat inside phase transformation sintering generate
Amount can be released by these crackles so that these crackles increase and grow up rapidly, eventually lead to Feather-like Crystal fracture, lose
Effect.
In order to improve the anti-particle erosion performance of thermal barrier coating, more existing heat-barrier coating ceramic layer surfaces of method
One layer of fine and close wearing layer is prepared using spraying, plated film and Laser Surface Treatment.Such as Wang et al. is using the side of laser remolten
Method reduces the porosity of surface ceramii layer to increase the hardness of surface ceramii layer（Effects of laser remelting
on microstructure and solid particles erosion characteristics of ZrO2-7wt%
Y2O3 thermal barrier coating prepared by plasma spraying [J],
CeramicsInternational, 2014, 40(6):8791-8799）；Zhang et al. uses magnetron sputtering metallic aluminium, so
It is vacuum-treated afterwards and forms dense oxide aluminium layer to improve anti-particle erosion performance（Effects of Al-deposition on
erosion resistance of plasma sprayed thermal barrier coating [J],
Transactions of Nonferrous Metals Socirty of China, 2015, 25(8):2587-2593）；Specially
Profit " a kind of multilayer thermal barrier coating and forming method thereof "（CN201410697118.4）Deng.The technique that these methods use is different,
But last is all to form a kind of double-deck and multilayer composite construction, and outer layer is compacted zone to improve scour resistance.And it is this
It is layering between the dense outer layer and inside of composite construction, there is apparent institutional framework and ingredient, chemical phase between two layers
Difference has apparent interface layer.And these interface layers can become coating binding force and thermal stability, chemical stability it is thin
Weak link, coating, most easily in these interface crack initiations, or even isolate and fall off when by particle encounter, influence coating performance and
Service life, while extremely complex Alternative, multipaths being brought to prepare problem, cost increases substantially.
Invention content
It is above-mentioned there are problem and shortage it is an object of the invention to be directed to, a kind of simple for process, at low cost, coating knot is provided
Close intensity height, the thermal barrier coating and preparation method thereof with long service life with anti-particle erosion superficial layer.
The technical proposal of the invention is realized in this way：
Thermal barrier coating of the present invention with anti-particle erosion superficial layer, its main feature is that：The thermal barrier coating is using plasma
The upper end of the ceramic layer in feathery structure that spraying-physical gas-phase deposition is arranged on matrix, the ceramic layer is height
Cohesive strength superficial layer, and the ceramic layer is located at the part below high cohesive strength superficial layer and between high cohesive strength superficial layer
It is connected for no interface.
Wherein, the thickness of above-mentioned high cohesive strength superficial layer is 30~100 μm.
The preparation method of thermal barrier coating of the present invention with anti-particle erosion superficial layer, its main feature is that including following step
Suddenly：
1）, will after matrix surface cleaning be fixed to the indoor workpiece motion s platform of vacuum on；
2）, close vacuum chamber, be evacuated to the Pa of pressure≤150；
3）, using plasma spraying-physical gas-phase deposition, in pressure≤150 Pa, 1~3 L/ of oxygen flow of vacuum chamber
Under the conditions of min, ceramic powders are sent into, ceramic powders realize evaporation after entering plasma flame flow, and are purged by plasma flame flow
Coating deposition early period is carried out to matrix, and coating is deposited to the 75~90% of total coating thickness early period；
4）, change plasma gas and adjust spray parameters simultaneously, into coating later deposition, high cohesive strength surface is made
Layer, completes the preparation of the ceramic layer of feathery structure.
Wherein, for the spraying current that above-mentioned coating early period, deposition used for 2500~2700 A, spray power is 120~130
KW, plasma working gas Ar, He, flow are 25~45 55~75 L/min of L/min, He of Ar, substrate temperature 850
~950 DEG C, powder feeding rate is 10~20 g/min, and spray distance is 850~1100 mm.
For the spraying current that above-mentioned coating later deposition uses for 1900~2000 A, spray power is 115~120 kW,
Plasma working gas is Ar, He, H2, and flow is 30~40 55~65 5~10 L/ of L/min, H2 of L/min, He of Ar
Min, substrate temperature are 900~950 DEG C, and powder feeding rate is 5~10 g/min, and spray distance is 850~1100 mm.
Compared with prior art, the present invention haing the following advantages：
（1）Feathery structure thermal barrier coating prepared by plasma spraying-physical vapour deposition (PVD) has preferable comprehensive performance, is not
Carry out the new technology that High Performance Aeroengine thermal barrier coating is given priority to, but it is being assigned because there are gaps between feathery structure
While the advantages that precoat is high to strain tolerance, and thermal cycle life is high, the disadvantage of also bringing anti-particle erosion performance low.And this
Invention, as anti-particle erosion surface, can increase substantially the anti-particle erosion performance of coating using high cohesive strength superficial layer；
（2）It is layering that tradition, which is improved between the resistance to erosion layer prepared and inside, and interface layer can become coating binding force and heat
Stability, the weak link of chemical stability, most easy crack initiation, or even fall off.And the present invention is heavy in featheriness thermal barrier coating
During product, directly adjusts and change plasma parameter, i.e., uninterrupted spraying process continues to deposit obtained high cohesive strength surface
Layer, the superficial layer and the coating previously grown do not have any difference in material composition, object phase, do not change macroscopical featheriness knot yet
On structure, only change the sedimentation mechanism of evaporation ceramic layer material by parameter regulation, forming component, structure be not stratified but surface layer in
Poly- intensity higher, more resistant to the coating washed away in performance.And coating combines and heat/chemical stability is thin the invention avoids that can become
The introducing of the interface layer of weak link, coating structure are simpler；
（3）Traditional resistance to particle erosion modified technique brings extremely complex preparation problem, and production procedure is more, and the time is long.And this
Invention directly carries out the change of plasma parameter in spray procedure operation, need not stop spray gun, stop powder feeding, interrupt routine
Deng, need not more go out vacuum chamber and replace other techniques, easy to adjust, technological process is simple, at low cost.
The present invention will be further described below with reference to the drawings.
Description of the drawings
Fig. 1 is the structural schematic diagram of thermal barrier coating of the present invention.
Fig. 2 is that the coating particle of the embodiment of the present invention 1 washes away weight-loss curve figure.
Specific implementation mode
Embodiment 1：
The present embodiment selects high temperature alloy K417G as base material, and total coating layer thickness is designed as 300 μm, wherein high cohesive strength table
Face layer is designed as 50 μm.Heat-barrier coating ceramic layer material selects yttria-stabilized zirconia（YSZ）Ceramic powders（Conglobation powder
End, -30+1 μm of grain size, ingredient such as following table）.
Specific preparation process is as follows：
The first step, matrix surface are ground polishing, alcohol ultrasonic cleaning, holding surface cleaning；
Second step prepares ceramic layer on matrix, is as follows：
(1) matrix is fixed on the indoor workpiece motion s platform of vacuum；
(2) vacuum chamber is closed, is vacuumized, the dynamic pressure of vacuum chamber is kept to be equal to 150 Pa, vacuum chamber leads to 2 L/min of oxygen；
(3) it is sent into ceramic layer powder, the plasma flame flow purging matrix containing ceramic layer material carries out coating deposition, substrate temperature
Control is at 850~950 DEG C.Coating deposition early period makes coatings growth to the 83% of overall thickness；
Preparation condition is：Spraying current is 2500 A, and power is 123 kW, plasma working gas Ar, He, flow Ar
35 60 L/min of L/min, He, for substrate temperature at 880 ± 20 DEG C, 20 g/min of powder feeding rate, spray distance is 950 mm；
（4）Into coating later deposition, change plasma gas and adjust spray parameters simultaneously, continues to deposit obtained high cohesion strong
Spend superficial layer；
Preparation condition is：Spraying current is 2000 A, and power is 118.5 kW, plasma working gas Ar, He, H2, flow
For 35 60 L/min and 10 L/min of H2 of L/min, He of Ar, substrate temperature is fluctuated at 900~950 DEG C, 10 g/ of powder feeding rate
Min, spray distance are 950 mm；
Third walks, and preparation terminates.
The anti-particle erosion with no interface layer is made in vapor deposition of the embodiment 1 by YSZ materials in matrix surface
The heat-barrier coating ceramic layer of superficial layer.The overall thickness of ceramic layer be 300 μm, moderate resistance ion wash away surface layer thickness be 50 ±
5 μm。
Using the anti-particle erosion effect of particle erosion experiment test coating, with reference to GE E50TF121 particle erosion standards,
20 ° of angle is washed away, 100 mm of distance, it is about 55 μm of grain sizes, 0.25 MPa of pressure, 25 s Fig. 2 of erosion time to wash away particle
It is that the coating particle of the present embodiment washes away weight-loss curve figure, it can be seen that wash away the incipient stage, superficial layer has extraordinary anti-
Particle erosion ability, coating weight-loss ratio is very low, and after in the later stage, superficial layer is washed out, weight-loss ratio can increase substantially, at this time
Through the YSZ ceramic layers for being washed into other parts.This example demonstrates that anti-particle erosion superficial layer is implicitly present in and has played very
The ability of good resistance particle erosion, coating service life are greatly improved.
Embodiment 2：
The present embodiment selects directionally solidified superalloy, DS superalloy DZ40M as base material, and total coating layer thickness is designed as 350 μm, anti-particle
It washes away superficial layer and is designed as 70 μm.Heat-barrier coating ceramic layer material selects yttria-stabilized zirconia YSZ.
Specific preparation process is as follows：
The first step, matrix surface are ground polishing, alcohol ultrasonic cleaning, holding surface cleaning；
Second step prepares ceramic layer on matrix, is as follows：
(1) matrix is fixed on the indoor workpiece motion s platform of vacuum；
(2) vacuum chamber is closed, is vacuumized, the dynamic pressure of vacuum chamber is kept to be equal to 150Pa, vacuum chamber leads to 1.5 L/min of oxygen；
(3) it is sent into ceramic layer powder, the plasma flame flow purging matrix containing ceramic layer material carries out coating deposition, substrate temperature
Control is at 920 ± 30 DEG C.Coating deposition early period makes coatings growth to the 80% of overall thickness；
Preparation condition is：Spraying current is 2600 A, and power is 127 kW, plasma working gas Ar, He, flow Ar
30 70 L/min of L/min, He, for substrate temperature at 900 ± 30 DEG C, 20 g/min of powder feeding rate, spray distance is 1000 mm；
（4）Into coating later deposition, change plasma gas and adjust spray parameters simultaneously, continues to deposit obtained high cohesion strong
Spend superficial layer；
Preparation condition is：Spraying current is 1900 A, and power is 112 kW, plasma working gas Ar, He, H2, and flow is
30 65 L/min and H25 L/min of L/min, He of Ar, substrate temperature at 870 ± 20 DEG C, 5 g/min of powder feeding rate, spraying away from
From for 1000 mm；
Third walks, and preparation terminates.
The anti-particle erosion with no interface layer is made in vapor deposition of the embodiment 2 by YSZ materials in matrix surface
The heat-barrier coating ceramic layer of superficial layer, overall thickness are 350 μm.
Using the anti-particle erosion effect of particle erosion experiment test coating, with reference to GE E50TF121 particle erosion standards,
20 ° of angle is washed away, 100 mm of distance, it is about 55 μm of grain sizes, 0.25 MPa of pressure, 25 s of erosion time to wash away particle.It surveys
Be washed depth in the amount unit interval, wherein plasma spraying-physical gas phase deposition technology prepare without anti-particle erosion
The YSZ thermal barrier coatings of superficial layer wash away 6.35 μm/s of rate average out to, 1.1 μm/s of the present embodiment average out to, such as following table.Unit
The coating layer thickness that time is washed away significantly declines, and illustrates that anti-particle erosion superficial layer plays extraordinary anti-particle erosion and makees
With the anti-particle erosion ability of coating is greatly improved.
The present invention is described by embodiment, but is not limited the invention, disclosed with reference to description of the invention
Embodiment other variation, such as the professional person of this field is readily apparent that, such variation should belong to this hair
Within the scope of bright claim limits.
Claims (5)
1. a kind of thermal barrier coating with anti-particle erosion superficial layer, it is characterised in that：The thermal barrier coating is using plasma spray
The upper end of the ceramic layer in feathery structure that painting-physical gas-phase deposition is arranged on matrix, the ceramic layer is in height
Poly- intensity surface layer, and the ceramic layer is located at the part below high cohesive strength superficial layer and is between high cohesive strength superficial layer
No interface connection.
2. the thermal barrier coating with anti-particle erosion superficial layer according to claim 1, it is characterised in that：Above-mentioned high cohesion is strong
The thickness for spending superficial layer is 30~100 μm.
3. a kind of preparation method of the thermal barrier coating with anti-particle erosion superficial layer, this method are used to prepare any of the above-described right
It is required that the thermal barrier coating, it is characterised in that include the following steps：
1）, will after matrix surface cleaning be fixed to the indoor workpiece motion s platform of vacuum on；
2）, close vacuum chamber, be evacuated to the Pa of pressure≤150；
3）, using plasma spraying-physical gas-phase deposition, in pressure≤150 Pa, 1~3 L/ of oxygen flow of vacuum chamber
Under the conditions of min, ceramic powders are sent into, ceramic powders realize evaporation after entering plasma flame flow, and are purged by plasma flame flow
Coating deposition early period is carried out to matrix, and coating is deposited to the 75~90% of total coating thickness early period；
4）, change plasma gas and adjust spray parameters simultaneously, into coating later deposition, high cohesive strength surface is made
Layer, completes the preparation of the ceramic layer of feathery structure.
4. the preparation method of the thermal barrier coating with anti-particle erosion superficial layer according to claim 3, it is characterised in that：On
It states coating and deposits the spraying current used as 2500~2700 A early period, spray power is 120~130 kW, plasma work
Gas is Ar, He, and flow is 25~45 55~75 L/min of L/min, He of Ar, and substrate temperature is 850~950 DEG C, powder feeding rate
For 10~20 g/min, spray distance is 850~1100 mm.
5. the preparation method of the thermal barrier coating with anti-particle erosion superficial layer according to claim 3, it is characterised in that：On
The spraying current that coating later deposition uses is stated as 1900~2000 A, spray power is 115~120 kW, plasma work
Gas is Ar, He, H2, flow is 30~40 L/min, He 55~65 L/min, H of Ar25~10 L/min, substrate temperature
It it is 900~950 DEG C, powder feeding rate is 5~10 g/min, and spray distance is 850~1100 mm.
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Cited By (4)
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| CN109628929A (en) * | 2019-01-07 | 2019-04-16 | 广东省新材料研究所 | A kind of thermal barrier coating and the preparation method and application thereof, aero engine turbine blades |
| CN112111184A (en) * | 2020-07-31 | 2020-12-22 | 西安交通大学 | Anti-dust high-temperature adhesion coating alternately stacked in layered and column/tree shapes |
| CN112126889A (en) * | 2020-08-21 | 2020-12-25 | 中国地质大学（武汉） | Method for optimizing thermal barrier coating stability by constructing bionic structure through 3D printing |
| CN113151772A (en) * | 2021-03-31 | 2021-07-23 | 辽宁科技大学 | Novel high-temperature corrosion-resistant thermal barrier coating with double ceramic layer structure and preparation method thereof |
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| CN112126889A (en) * | 2020-08-21 | 2020-12-25 | 中国地质大学（武汉） | Method for optimizing thermal barrier coating stability by constructing bionic structure through 3D printing |
| CN113151772A (en) * | 2021-03-31 | 2021-07-23 | 辽宁科技大学 | Novel high-temperature corrosion-resistant thermal barrier coating with double ceramic layer structure and preparation method thereof |
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