CN109680239A - Anti- sintering long life double layer structure thermal barrier coating of one kind and preparation method thereof - Google Patents
Anti- sintering long life double layer structure thermal barrier coating of one kind and preparation method thereof Download PDFInfo
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- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
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- C23C4/134—Plasma spraying
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- 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
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- C—CHEMISTRY; METALLURGY
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- 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
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- 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
- C23C4/129—Flame spraying
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Abstract
The present invention discloses the anti-sintering long life double layer structure thermal barrier coating of one kind and its preparation process, including internally positioned toughening layer and positioned at external thermal insulation layer；Thermal insulation layer is made of fine and close piece layer unit and loose nano particle heap composite stack；Toughening layer accounts for the 10%~50% of double-layer structure thermal barrier coating overall thickness, and the fracture toughness of the first heat barrier coat material used is greater than or equal to 2.5MPam1/2；Thermal insulation layer accounts for the 50%~90% of the double-deck overall thickness, and the second heat barrier coat material and third the heat barrier coat material used thermal conductivity at 1000~1600 DEG C are no more than 2.5W/mK.Double-layer structure thermal barrier coating proposed by the invention, the purpose of achievable ceramic coating anti-sintering under high temperature environment, and heat-insulated hole is counteracted to the deleterious effects of service life by the design of toughening layer, to realize the anti-sintering of new structure thermal barrier coating and the collaborative design of long-life.
Description
Technical field
The invention belongs to coating technology field, in particular to a kind of thermal barrier coating and preparation method thereof.
Background technique
The hot end construction material of aero-engine and gas turbine is mostly high temperature alloy.Currently, state-of-the-art monocrystalline high temperature
Alloy holds the warm limit no more than 1000 DEG C, however the service temperature of engine interior hot end component is considerably beyond high temperature conjunction
Gold holds the warm limit.Moreover, the service temperature of engine interior can be increasingly with the continuous improvement of aero-engine thrust ratio
It is high.Therefore, it is on active service to stablize high temperature alloy in far surpassing its environment for holding the warm limit, it is necessary to be provided for alloy components heat-insulated
" vest ", that is, thermal barrier coating (Thermal barrier coatings, TBCs).TBCs can be effectively by high-temperature fuel gas
It is isolated with hot-end component matrix, so that alloy surface temperature significantly reduces, and then improves the working efficiency of engine.Therefore,
TBCs is one of the core technology of aero-engine of new generation and gas turbine development.
TBCs needs to consider its heat insulating function and military service stability simultaneously during military service.For its functionality,
Apparent sintering phenomenon can occur in prolonged heat exposure for TBCs, so that its internal a large amount of micropore for playing heat-blocking action is cured
It closes；In turn, the heat insulating function of TBCs is significantly reduced.For example, 1300 DEG C heat exposure 50 hours, with YSZ preparation TBCs heat
Conductance by from initial state~1.0W/mK rises to~2.2W/mK, heat-insulating capability directly declines 50% or more.Therefore, inhibit
The key for the TBCs heat-proof quality decline that sintering causes is to maintain being stabilized for its internal void.The hole caused due to sintering
Healing is inevitable, therefore, feasible approach be exactly by structure design allow micropore healing while again
It is raw, to remain stable heat-insulated void content.
On the other hand, hole is a double-edged sword to thermal barrier coating.Hole also reduces while improving heat insulation
The ability that coating cracking resistance peels off.Thermal barrier coating be mostly the failure during military service by its internal void under the action of stress
Caused by extension, connection.Therefore, while realizing the regeneration of thermal barrier coating hole, it is necessary to while being designed and being improved by structure
The anti-strip ability of coating is on active service so that high heat-insulated thermal barrier coating can be stablized with the long period.
To sum up, on the one hand high-performance TBCs of new generation structure design need to guarantee that the stabilization of heat-insulated hole is deposited in heat exposure
On the other hand the anti-strip ability of coating need to be being promoted, simultaneously to realize the collaborative design of TBCs high heat-insulated long-life.
Summary of the invention
It is heat-insulated the purpose of the present invention is to provide a kind of anti-sintering long life double layer structure thermal barrier coating and its preparation process
Compact layer structure design in layer the spontaneous opening by interface can form heat-insulated hole in high-temperature service, to reach anti-
The purpose of sintering；The cracking resistance peel-ability of thermal barrier coating then can be improved in toughening layer, extends its service life, to realize a new generation
The collaborative design of thermal barrier coating anti-sintering long-life.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of anti-sintering long life double layer structure thermal barrier coating, including the toughening layer that sets gradually from bottom to top and heat-insulated
Layer, toughening layer includes first layer unit that several layers are formed by the first heat barrier coat material；Thermal insulation layer includes being arranged alternately
First coating and second coating, first coating include second layer unit of several layers, and second coating includes several is arranged at intervals on
Third piece layer unit in first coating, the bottom of thermal insulation layer are first coating, and the first coating of non-bottom covers below
First coating and third piece layer unit；Second layer unit and third piece layer unit respectively by the second heat barrier coat material powder and
Third heat barrier coat material is made, and the lamella consistency of first layer unit and second layer unit is all larger than 90%；Third piece
The lamella consistency of layer unit is less than 60%；Toughening layer accounts for the 10%~50% of toughening layer and thermal insulation layer overall thickness, the first thermal boundary
The fracture toughness of coating material is greater than or equal to 2.5MPam1/2；Thermal insulation layer account for toughening layer and thermal insulation layer overall thickness 50%~
90%, the second heat barrier coat material and third the heat barrier coat material used thermal conductivity at 1000~1600 DEG C are no more than 2.5W/
m·K。
Further, there is second layer unit of M layer between direction of heat flow, adjacent second coating, M is between 10-100
Natural number；The volume of all third piece layer units is all second layer units and all third piece layer unit total volumes
10%~50%.
Further, the Coating combination rate of first layer unit is not less than 50% in toughening layer；Second lamella in thermal insulation layer
The Coating combination rate of unit is not higher than 30%.
Further, first layer unit and second layer unit are applied by the first heat barrier coat material and the second thermal boundary respectively
Layer material powder dissolved drip sprawls solidification formation again, first layer unit and second layer unit perpendicular to the size of direction of heat flow
It is 5 μm~40 μm, the size along direction of heat flow is 0.5~5 μm；Third piece layer unit is by the suspension containing nano particle
It sprawls, is 10~300 μm along the size perpendicular to direction of heat flow, along being parallel to direction of heat flow having a size of 0.5~15 μm, institute
The partial size for stating the nano particle in the suspension containing nano particle is 5~200nm.
Further, in toughening layer, there is the first interlayer micropore between first layer unit of adjacent two layers, same layer
There is micro-crack in first layer between adjacent first layer unit；In thermal insulation layer, have between second layer unit of adjacent two layers
Second interlayer micropore has micro-crack in the second layer between adjacent second layer unit of same layer.
Further, third lamella unit interval is arranged in first coating, and third piece layer unit covers the under it
The 10%~50% of the surface area of one coating.
A kind of preparation method of anti-sintering long life double layer structure thermal barrier coating comprising the steps of:
Step 1, the method deposited metal adhesive layer of thermal spraying is used on matrix；
Step 2, the first heat barrier coat material is deposited using the method for thermal spraying on metal bonding coating and forms toughening layer；
Step 3, using the method for mixing spraying, the second heat barrier coat material of alternating deposit and third thermal boundary on toughening layer
Coating material forms thermal insulation layer.
Further, in step 2, preheated substrate temperature is to 300 DEG C~500 DEG C during deposition.
Further, in step 3, substrate temperature is no more than 200 DEG C during deposition.
Further, it in step 3, using the second heat barrier coat material of plasma spray deposition, is sprayed using suspension liquid material
Painting technology sprays the suspension of third heat barrier coat material powder, and the suspension concentration of third heat barrier coat material powder is
2mol/L~5mol/L.
Compared with the existing technology, the invention has the following advantages:
The present invention is based on the plasma spray coating process of mature low cost, the double-layer structure heat with the anti-sintering long-life is designed
Barrier coating.Compact layer stacked structure is deposited in thermal insulation layer, based on the sintering shrinkage otherness of different consistency lamellas, in height
It warmly takes and spontaneously forms high heat-insulated hole in labour, realize designing and preparing for anti-sintering thermal barrier coating；Toughening layer is introduced, with enhancing
The anti-strip ability of thermal barrier coating entirety, realizes the long life serve of thermal barrier coating.Toughening layer lower thickness limit 10% is to guarantee to apply
Layer is whole to have certain anti-cracking ability, and toughening layer upper thickness limit is 50%, to guarantee the thermal insulation of not weaken coating entirety
Energy；Double-layer structure based on the proposition of this research institute can take into account anti-sintering and the long-life for realizing coating, to high-performance heat of new generation
The development of barrier coating has great influence.
By the composite deposition of the piece layer unit of different consistency, single lamella stacked structure is overcome in high-temperature service
The performance that sintering causes significantly fails, and has achieved the purpose that whole anti-sintering；By introducing toughening layer, guaranteeing that coating height is heat-insulated
While, the ability of coating anti-strip is further improved, realizes the long life serve of high heat-insulated TBCs.And the anti-burning of proposition
The new structure of long life double layer structure thermal barrier coating is tied based on inexpensive mature plasma spray coating process, is had feasible
Property feature strong, that engineering application can be fast implemented.
Further, along the adjacent third piece layer unit of direction of heat flow in thermal insulation layer second layer unit of longitudinal gap M layer,
M is the natural number in 10-100.The volume content of third piece layer unit is second layer unit and third piece layer unit total volume
10%~50%.The lower limit of M and volume content be in order to make coating that can spontaneously form certain new hole in high-temperature service,
Achieve the purpose that anti-sintering；The upper limit of M and volume content be interconnected to form in order to avoid the hole newly formed macrovoid into
And the cracking for causing coating peels off.
Further, the Coating combination rate of first layer unit 5 in toughening layer 3 is not less than 50%；Second in thermal insulation layer 4
The Coating combination rate of piece layer unit 6 is not higher than 30%.Toughening layer Percentage bound can guarantee its whole cracking resistance energy not less than 50%
Power, thermal insulation layer Percentage bound can guarantee its whole heat-insulating capability not higher than 30%.
Detailed description of the invention
Fig. 1 is the section shape using the anti-sintering long life double layer structure thermal barrier coating of plasma spraying technology deposition preparation
Looks schematic diagram；
Fig. 2 is the cross-section morphology schematic diagram of the anti-sintering long life double layer structure thermal barrier coating after heat treatment；
In attached drawing: 1, matrix, 2, metal bonding coating, 3, toughening layer, 4, thermal insulation layer, 5, first layer units, 6, second
Layer unit, 7, third piece layer unit, the 81, first interlayer micropore, the 82, second interlayer micropore, 91, micro-crack in first layer,
92, micro-crack in the second layer, 10, high-temperature service formed hole.
Specific embodiment
It is the specific embodiment that inventor provides below, it should be noted that these embodiments are the present invention preferably examples
Son is used for it will be understood by those skilled in the art that the present invention, but the invention is not limited to these embodiments.
Refering to Figure 1, the present invention provides a kind of preparation method of anti-sintering long life double layer structure thermal barrier coating, packet
Containing following steps:
Step 1, the gold for preparing 150 μ m-thicks using low-voltage plasma spraying technique on cylindrical 1 surface of high temperature alloy matrix
Belong to adhesive layer 2.
Step 2 uses partial size to be crushed powder for 5 μm~25 μm of 8YSZ melting on metal bonding coating 2, passes through atmosphere etc.
Plasma-spray method prepares 150 μm of thickness of toughening layer 3.During spraying, in order to make the interlayer of first layer unit 5
Percentage bound is not less than 50%, is sprayed substrate preheating to 400 DEG C again using warm table；First layer unit 5 along perpendicular to
The size of direction of heat flow is 5 μm~40 μm, and the size along direction of heat flow is 0.5~5 μm, in two layers adjacent of first layer units
Contain the first interlayer micropore 81 between 5, contains micro-crack in the second layer between two adjacent first layer units 5 of same layer
91, the first interlayer micropore 81 perpendicular to direction of heat flow having a size of 1~40 μm, be parallel to 0.01~0.5 μ of direction of heat flow size
M, micro-crack 91, having a size of 0.01~0.8 μm, is being parallel to 0.5~5 μ of direction of heat flow size perpendicular to direction of heat flow in first layer
m.Spray power is 42kW, and main gas argon gas is 50L/min, and auxiliary gas hydrogen is 7L/min, and spray distance 80mm walks rifle rate
500mm/s；
Step 3 prepares thermal insulation layer 4 using the method for mixing spraying on toughening layer 3:
Step 3.1 uses partial size for 40 μm~70 μm of 8YSZ spherical hollow powder, is being increased by atmospheric plasma technology
The first coating of 10 μm of thickness, Coating combination rate 30% is prepared in spraying on tough layer 3, and first coating is by 8~15 layer of second lamella
Unit 6 stacks；Second layer unit 6 is 5 μm~40 μm along the size perpendicular to direction of heat flow, along the size of direction of heat flow
It is 0.5~5 μm, the second interlayer micropore 82, the second adjacent lamella of same layer is contained between two layers adjacent of second layer units 6
Between unit 6 have the second layer in micro-crack 92, the second interlayer micropore 82 perpendicular to direction of heat flow having a size of 1~40 μm,
It is parallel to 0.01~0.5 μm of direction of heat flow size；In the second layer micro-crack 92 perpendicular to direction of heat flow having a size of 0.01~0.8
μm, it is parallel to 0.5~5 μm of direction of heat flow size.Spray power is 42kW, and main gas argon gas is 50L/min, and auxiliary gas hydrogen is 7L/
Min, spray distance 110mm walk rifle rate 800mm/s, are no more than 150 DEG C using compressed air control substrate temperature；
Step 3.2 sprays nanocrystals YSZ dispersion liquid using suspension liquid material spraying technology, in deposited first coating
Spraying forms several perpendicular to direction of heat flow having a size of 10~300 μm, be parallel to direction of heat flow having a size of 0.5~15 μm the
Three pieces layer unit 7 forms second coating, spray power 39kW, and main gas argon gas is 60L/min, and auxiliary gas hydrogen is 4L/min, spray
Distance 250mm is applied, rifle rate 1500mm/s, liquid flowing rate 20mL/min are walked.Since suspension only sprays several third pieces
Layer unit 7 substantially only needs to spray and quickly sweep one time, will not have apparent heat effect to following coating, so
Control substrate temperature is not needed.
Step 3.3, in the second coating that the first coating and step 3.2 that step 3.1 is formed are formed using atmosphere etc. from
Sub- technology covers one layer of first coating again, and first coating includes 8~15 layers of second layer unit 6；Second layer unit 6 is by second
In the second coating for hitting the first coating and step 3.2 formation that are formed to step 3.1 after the fusing of heat barrier coat material powder, and
It is sprawled solidification and is formed；It is no more than 150 DEG C using compressed air control substrate temperature；
Step 3.4 repeats step 3.1 to step 3.3, until 4 overall thickness of thermal insulation layer reaches 350 μm, wherein all thirds
The volume of piece layer unit 7 accounts for the 30% of all second layer units 6 and all 7 total volumes of third piece layer unit.
In step 3, substrate temperature is controlled during deposition and is no more than 200 DEG C, to realize between second layer unit 6
Percentage bound is not higher than 30%.In step 3, using the second heat barrier coat material of plasma spray deposition, sprayed using suspension liquid material
Painting technology sprays the dispersion liquid of third heat barrier coat material powder, and suspension concentration is 2~5mol/L.
Embodiment 2
The present embodiment difference from example 1 is that, in step 1, the heat spraying method used is vacuum plasma
Spraying, supersonic flame spraying or cold spraying.
Embodiment 3
The present embodiment and embodiment 2 the difference is that, in step 1, metal bonding coating 2 with a thickness of 100 μm；Step
In 2, preheated substrate temperature is to 300 DEG C during deposition；In step 3, it is not surpass that substrate temperature is controlled during deposition
Cross 180 DEG C.
Embodiment 4
The present embodiment and embodiment 3 the difference is that, in step 1, metal bonding coating 2 with a thickness of 125 μm；Step
In 2, preheated substrate temperature is to 500 DEG C during deposition；In step 3, it is not surpass that substrate temperature is controlled during deposition
160 DEG C are crossed, the liquid concentration of nanocrystals YSZ dispersion liquid is 5mol/L.
Embodiment 5
The present embodiment difference from example 1 is that, in step 3, the liquid concentration of nanocrystals YSZ dispersion liquid is
3.5mol/L。
Embodiment 6
The present embodiment difference from example 1 is that, in step 2, toughening layer 3 with a thickness of 50 μm, step 3 interval
Thermosphere with a thickness of 450 μm.
Embodiment 7
The present embodiment difference from example 1 is that, in step 2, toughening layer 3 with a thickness of 250 μm, in step 3
Thermal insulation layer with a thickness of 250 μm.
Embodiment 8
The present embodiment difference from example 1 is that, in step 3, the volume of third piece layer unit 7 accounts for the second lamella
The 50% of 7 total volume of unit 6 and third piece layer unit.
Embodiment 9
The present embodiment difference from example 1 is that, in step 3, the volume of third piece layer unit 7 accounts for the second lamella
The 10% of 7 total volume of unit 6 and third piece layer unit.
Based on process above, anti-sintering long life double layer structure thermal barrier coating is prepared, as shown in Figure 1.Anti- sintering is long-lived
Ordering double-layer structure thermal barrier coating includes the metal bonding coating 2, toughening layer 3 and thermal insulation layer 4 set gradually.The thickness of metal bonding coating 2
Degree is 100 μm~150 μm, and toughening layer 3 is deposited by the first heat barrier coat material powder and formed, and toughening layer 3 accounts for double-layer structure thermal boundary
The fracture toughness of the 10%~50% of total coating thickness, the first heat barrier coat material used is greater than or equal to 2.5MPam1/2.Increase
Tough layer lower thickness limit 10% is that have certain anti-cracking ability in order to guarantee coating integrally, toughening layer upper thickness limit 50% be for
The not heat-proof quality of weaken coating entirety.
Thermal insulation layer 4 accounts for the 50%~90% of double-layer structure thermal barrier coating overall thickness, the second heat barrier coat material used and
Three heat barrier coat materials thermal conductivity at 1000~1600 DEG C is no more than 2.5W/mK.
Thermal insulation layer 4 is made of second layer unit 6 and 7 composite stack of third piece layer unit.Specifically, thermal insulation layer 4 is by
Two heat barrier coat material powder and third heat barrier coat material powder alternatively layered deposit to be formed；First heat barrier coat material powder
It is deposited respectively with the second heat barrier coat material powder and forms the layer unit 5 and second layer unit 6, and lamella consistency is big
In 90%；Third heat barrier coat material powder deposits to form third piece layer unit 7, and lamella consistency is less than 60%.
Along the adjacent third piece layer unit 7 of direction of heat flow, second layer unit 6 of longitudinal gap M layer, M are certainly in thermal insulation layer 4
So number, the value range of M are 10-100.The volume content of third piece layer unit 7 is second layer unit 6 and third piece layer unit
The 10%~50% of 7 total volumes.The lower limit of M and volume content is certain in order to spontaneously form coating can in high-temperature service
New hole achievees the purpose that anti-sintering；The upper limit of M and volume content is in order to avoid the hole newly formed is interconnected to form greatly
Hole and then the cracking peeling for causing coating.Third piece layer unit 7 is arranged at intervals in first coating, and it covers under it
The 10%~50% of the surface area of one coating, lower limit are to guarantee to form that certain hole is heat-insulated, and the upper limit avoids the formation of excessive
Hole influences service life.
First layer unit 5 and second layer unit 6 are sprawled solidification again by powder dissolved drip and are formed, perpendicular to direction of heat flow
Size be 5~40 μm, along direction of heat flow be 0.5~5 μm.Third piece layer unit 7 is sprawled by the suspension containing nano particle
It forms, is 10~300 μm along the size perpendicular to direction of heat flow, along being parallel to direction of heat flow having a size of 0.5~15 μm, nanometer
The partial size of grain is 5~200nm.
First layer unit, 5 Coating combination rate in toughening layer 3 is not less than 50%；Second 6 layers of layer unit in thermal insulation layer 4
Between Percentage bound be not higher than 30%.The Coating combination rate of toughening layer can guarantee its whole anti-cracking ability not less than 50%, heat-insulated
Percentage bound can guarantee its whole heat-insulating capability not higher than 30% between layer by layer.
Comprising micro-crack in interlayer micropore and layer in toughening layer 3 and thermal insulation layer 4, interlayer micropore is perpendicular to hot-fluid
Direction having a size of 1~40 μm, be parallel to 0.01~0.5 μm of direction of heat flow size, micro-crack is perpendicular to direction of heat flow ruler in layer
Very little is 0.01~0.8 μm, is parallel to 0.5~5 μm of direction of heat flow size.
Referring to Fig. 2, during military service, due to the shrinkage direction of third piece layer unit 7 and second layer unit 6 on the contrary,
And the shrinkage degree of loose third piece layer unit 7 is big compared with second layer unit 6, thus in second layer unit 6 and third lamella
7 interface of unit spontaneously forms several holes 10 perpendicular to direction of heat flow, delays performance degradation, reaches the mesh of whole anti-sintering
's.Meanwhile cracking resistance of coating during military service can be improved in toughening layer, achievees the purpose that long life serve.In turn, it is based on
The collaborative design of anti-sintering long-life thermal barrier coating is realized in double-layer structure design.
Claims (10)
1. a kind of anti-sintering long life double layer structure thermal barrier coating, which is characterized in that including the toughening set gradually from bottom to top
Layer (3) and thermal insulation layer (4), toughening layer (3) include first layer unit (5) that several layers are formed by the first heat barrier coat material；
Thermal insulation layer (4) includes the first coating and second coating being arranged alternately, and first coating includes second layer unit (6) of several layers,
Second coating includes several third piece layer units (7) being arranged at intervals in first coating, and the bottom of the thermal insulation layer (4) is
One layer of first coating, the first coating covering of non-bottom first coating below and third piece layer unit in thermal insulation layer (4)
(7)；Second layer unit (6) is made of the second heat barrier coat material powder, third piece layer unit (7) the third thermal boundary
Coating material is made, and the lamella consistency of first layer unit (5) and second layer unit (6) is all larger than 90%；
The lamella consistency of the third piece layer unit (7) is less than 60%；
The thickness of the toughening layer (3) accounts for the 10%~50% of toughening layer (3) and thermal insulation layer (4) overall thickness, first thermal boundary
The fracture toughness of coating material is greater than or equal to 2.5MPam1/2；
The thermal conductivity of second heat barrier coat material and third heat barrier coat material at 1000~1600 DEG C is no more than 2.5W/
m·K。
2. the anti-sintering long life double layer structure thermal barrier coating of one kind according to claim 1, which is characterized in that along hot-fluid side
To having second layer unit (6) of M layer, natural number of the M between 10-100 between adjacent second coating；All third lamellas
The volume of unit (7) is the 10%~50% of all second layer units (6) and all third piece layer unit (7) total volumes.
3. the anti-sintering long life double layer structure thermal barrier coating of one kind according to claim 1, which is characterized in that the toughening
The Coating combination rate of first layer unit (5) is not less than 50% in layer (3)；The interlayer of second layer unit (6) in thermal insulation layer (4)
Percentage bound is not higher than 30%.
4. the anti-sintering long life double layer structure thermal barrier coating of one kind according to claim 1, which is characterized in that described first
Piece layer unit (5) and second layer unit (6) are respectively by the first heat barrier coat material and the second heat barrier coat material powder dissolved drip
It sprawls solidification again to be formed, first layer unit (5) and second layer unit (6) are 5 μm perpendicular to the size of direction of heat flow
~40 μm, the size along direction of heat flow is 0.5 μm~5 μm；Third piece layer unit (7) is spread by the suspension containing nano particle
It opens up, is 10 μm~300 μm along the size perpendicular to direction of heat flow, along being parallel to direction of heat flow having a size of 0.5 μm~15 μm,
The partial size of nano particle in the suspension containing nano particle is 5nm~200nm.
5. the anti-sintering long life double layer structure thermal barrier coating of one kind according to claim 1, which is characterized in that the toughening
Layer (3) in, between first layer unit (5) of adjacent two layers have the first interlayer micropore (81), adjacent first of same layer
There is micro-crack (91) in first layer between layer unit (5)；In the thermal insulation layer (4), second layer unit (6) of adjacent two layers it
Between there is the second interlayer micropore (82), there is between adjacent second layer unit (6) of same layer micro-crack in the second layer
(92)。
6. the anti-sintering long life double layer structure thermal barrier coating of one kind according to claim 1, which is characterized in that the third
Piece layer unit (7) is arranged at intervals in first coating, and the third piece layer unit (7) covers the surface of the first coating under it
Long-pending 10%~50%.
7. the preparation side of the anti-sintering long life double layer structure thermal barrier coating of one kind according to any one of claim 1 to 6
Method, which is characterized in that comprise the steps of:
Step 1, the method deposited metal adhesive layer (2) of thermal spraying is used on matrix (1)；
Step 2, the first heat barrier coat material is deposited on metal bonding coating (2) forms toughening layer (3)；
Step 3, using the method for mixing spraying, the second heat barrier coat material of alternating deposit and third thermal boundary on toughening layer (3)
Coating material is formed thermal insulation layer (4).
8. the preparation method of the anti-sintering long life double layer structure thermal barrier coating of one kind according to claim 6, feature exist
During deposition, matrix (1) is first preheated to 300 DEG C~500 DEG C in step 2.
9. the preparation method of the anti-sintering long life double layer structure thermal barrier coating of one kind according to claim 6, feature exist
In in step 3, the temperature of matrix (1) is no more than 200 DEG C during deposition.
10. the preparation method of the anti-sintering long life double layer structure thermal barrier coating of one kind according to claim 6, feature exist
In in step 3, using the second heat barrier coat material of plasma spray deposition, using suspension liquid material spraying technology spraying third
The suspension of heat barrier coat material powder, the suspension concentration of third heat barrier coat material powder are 2mol/L~5mol/L.
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Application publication date: 20190426 |