CN110387520A - Bionical dam configuration gradient coating of crack arrest anti-strip and preparation method thereof - Google Patents
Bionical dam configuration gradient coating of crack arrest anti-strip and preparation method thereof Download PDFInfo
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- CN110387520A CN110387520A CN201910830862.XA CN201910830862A CN110387520A CN 110387520 A CN110387520 A CN 110387520A CN 201910830862 A CN201910830862 A CN 201910830862A CN 110387520 A CN110387520 A CN 110387520A
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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
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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
- C23C4/129—Flame 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
- C23C4/12—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
- C23C4/18—After-treatment
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Abstract
The present invention relates to bionical dam configuration gradient coatings of a kind of crack arrest anti-strip and preparation method thereof, belong to thermal barrier coating and its field of surface modification.Including ceramic layer on surface, metal bonding coating and annular dykes and dams structural body.Annular dykes and dams structural body is prepared in surface ceramii layer using laser technology.Self-healing particle molybdenum disilicide proportion is gradually increased from the inside to the outside in annular dykes and dams structural body, so as to form the thermal barrier coating with gradient characteristics dam configuration body, can effectively block the germinating and extension of crackle.The method that different materials system dam configuration body is arranged due to using laser technology in the present invention in thermal barrier coating, scleroid dam configuration body is set to form the reinforced structure that there is bipolar mixture to replace variation characteristic with the spraying state ceramic coating of quality flexible relative, the germinating of crackle is delayed in this way, the extension for having blocked crackle improves the thermal shock resistance of thermal barrier coating.
Description
Technical field
The present invention relates to thermal barrier coating and its field of surface modification, in particular to a kind of bionical dam configuration of crack arrest anti-strip
Gradient coating and preparation method thereof.
Background technique
Thermal Barrier Coating Technologies are to develop the key technology of high-performance aeroengine, are widely used in aero-engine at present
Combustion chamber and engine blade on, can reduce the surface temperature of matrix high temperature alloy using thermal barrier coating, protection matrix is exempted from
By high-temperature oxydation, reduce cooling gas dosage in engine, fuel gas temperature is improved, to improve the thrust ratio of aero-engine.
Therefore, with the development of science and technology, in various fields such as space flight, aviation, fuel gas generation, chemical industry, metallurgy, thermal barrier coating will
It obtains widely studying and applying.
Now widely used thermal barrier coating is double-layer structure, that is, by metal bonding coating and surface ceramic coat group
At.Ceramic layer is generally the yttrium partially stabilized zirconium oxide of 6%~8% oxidation, and ceramic layer plays heat-insulated effect, general using big
Gas plasma spraying, electro beam physics vapour deposition or plasma spraying-physical gas-phase deposite method preparation.Bonding layer material is general
All over MCrAlY alloy is used, wherein M represents Ni, Co or Ni and Co mixture, and metal bonding coating plays antioxidant anticorrosive and makes to make pottery
The effect that enamel coating and matrix are combined closely.This intermediate layer reduces interfacial stress, avoids the too early peeling of ceramic layer.
Generally prepared using Low Temperature High Oxygen-Air Fuel Spray or low-voltage plasma spraying method.
The Service Environment of aero engine turbine blades thermal barrier coating is sufficiently complex, should be rushed during the work time by heat
Load is hit, and will receive mechanical load, work and off working state can make coating repeatedly be subjected to cold cycling, and micro-crack is opened
Begin to germinate, extend, to the last crackle, which is gained a thorough understanding of through mastery of all relevant material, leads to thermal barrier coating spalling failure and service life reduction.Therefore, thermal boundary
The too early peeling of coating is one of the principal mode of thermal barrier coating failure.Use laser technology with thermal spraying complex technique to improve
Concern of the thermal shock resistance of thermal barrier coating by domestic and international experts and scholars is generally studied using following several method.One
It is the overlap joint weight for carrying out monoblock type to the ceramic layer on surface of thermal barrier coating using the biggish laser energy density of Laser Cladding
It is molten；Second is that being taken using the lesser laser energy density of laser glazing technology to the thin layer of the ceramic layer on surface of thermal barrier coating
Connect remelting.But these methods make residual stress in coating larger, and coating cracking is serious, cannot effectively improve thermal barrier coating
Performance.Therefore, the research for improving heat-barrier coating heat-shock resisting performance is urgently explored.
Improving ceramic performance using crack healing mechanism is research hotspot in recent years.Ceramics belong to fragile material, counterincision
Line is very sensitive.The process of thermal barrier coating thermal shock failure is actually a series of crack initiation, extension and merges, and is eventually led to
The process of disbonding.Self-healing particle is added in thermal barrier coating, when the crack surfaces in coating encounter the oxygen in atmosphere,
Under the high temperature conditions, the self-healing particle being present in around crackle occurs oxidation reaction and fills up crackle, triggers crack healing mechanism,
To restorer intensity.
Many of nature biology shell, plant leaf blade etc. have excellent crack arrest, anti-fatigue performance.These lifes
Object table has certain geometrical shape (dowel pin shape, dykes and dams shape, rail shape etc.) in the prevalence of geometric non-smooth morphological feature
Structural unit body with random or regularity distribution in its body surface.These geometric non-smooth cell cubes not only have good rigid
Property and toughness, and these unique structures are bonded with matrix in several ways, to impart these biologies
Excellent functional characteristic.
Summary of the invention
The purpose of the present invention is to provide bionical dam configuration gradient coating of a kind of crack arrest anti-strip and preparation method thereof, solutions
The problem of air plasma spraying thermal barrier coating of the existing technology of having determined peels off too early under high-temperature service environment, i.e. heat resistanceheat resistant
Shock stability.The present invention not only optimizes the pattern and structure of coating surface modifying, but also passes through the self-healing of addition different proportion
Distribution gradient greatly improves high temperature oxidation resistance and the heat resistanceheat resistant of coating in annular dam configuration to particle from inside to outside
Shock stability.The present invention uses bionics theory, using laser technology and thermal spraying complex technique, by adding crackle self-healing
Grain, prepares a kind of thermal barrier coating with gradient characteristics dam configuration body.
Above-mentioned purpose of the invention is achieved through the following technical solutions:
The bionical dam configuration gradient coating of crack arrest anti-strip, including ceramic layer on surface 1, metal bonding coating 3 and annular dam configuration
Body 2, the ceramic layer on surface 1 are set there are three annular dykes and dams structural body 2 of different sizes, described three annular dykes and dams structural bodies 2
Cross section be it is parabola shaped, three annular dykes and dams structural bodies are with one heart and depth is 100 μm~350 μm, three annular dykes and dams
The width of structural body is 1mm~3mm, and adjacent annular dam configuration body spacing is 1mm~4mm；Innermost annular dam configuration
Body is 1mm~4mm away from circular specimen centre distance, and outermost annular distance of the dykes and dams structural body away from circular specimen outer rim is
1mm~3mm, and the sum of the surface area of all annular dykes and dams structural bodies accounts for the 10%~70% of thermal barrier coating surface in thermal barrier coating；
The material of the annular dykes and dams structural body 2 ZrO2(7YSZ partially stabilized by 7wt.%Y2O3) and molybdenum disilicide form, and by interior
Into outer dykes and dams structural body, mass percent shared by molybdenum disilicide is followed successively by 5%~10%, 10%~15%, 15%~20%.
Another object of the present invention is to provide a kind of preparation method of the bionical dam configuration gradient coating of crack arrest anti-strip,
Include the following steps:
Step 1: carrying out cleaning and blasting treatment to 4 surface of matrix；
Step 2: the thermal barrier coating includes that ceramic layer on surface 1 and metal are viscous in the thermal barrier coating of matrix surface preparation thermal spraying state
Layer 3 is tied, when preparing thermal barrier coating, first metal bonding coating 3 is prepared on 4 surface of matrix, then prepares table on metal bonding coating 3
Face ceramic layer 1；
Step 3: carrying out the pre-heat treatment to thermal barrier coating；
Step 4: preparing annular dykes and dams structural body 2, three annular dykes and dams structural bodies on ceramic layer on surface using laser technology
With one heart and depth is 100 μm~350 μm, and the width of three annular dykes and dams structural bodies is 1mm~3mm, adjacent annular dam configuration
Body spacing is 1mm~4mm；Innermost annular dykes and dams structural body is 1mm~4mm away from circular specimen centre distance, outermost
Annular distance of the dykes and dams structural body away from circular specimen outer rim be 1mm~3mm, and in thermal barrier coating all dam configuration bodies surface
The sum of product accounts for the 10%~70% of thermal barrier coating surface.
The heating temperature of the pre-heat treatment is carried out at 500 DEG C~700 DEG C to thermal barrier coating described in step 3.
In laser technology described in step 4, laser uses rated power to swash for the Nd:YAG solid of 800W~1000W
Light device, the electric current of the laser are 60A~200A, and pulsewidth is 1ms~10ms, and frequency is 1Hz~20Hz, scanning speed 1mm/
S~5mm/s, adjacent laser radiation area overlapping rate are 10%~50%.
Mass percent shared by molybdenum disilicide is followed successively by 5%~10%, 10%~15% in annular dykes and dams structural body from the inside to the outside,
15%~20%.
The metal bonding coating 3 is made of the method for Low Temperature High Oxygen-Air Fuel Spray, and metal bonding coating with a thickness of
50 μm~120 μm.
The ceramic layer on surface 1 is made of the method for air plasma spraying, and ceramic layer on surface is with a thickness of 150 μm
~400 μm.
The beneficial effects of the present invention are: the present invention is prepared on thermal barrier coating using laser and thermal spraying complex technique
Dam configuration body.In dam configuration body of the present invention mass percent shared by self-healing particle molybdenum disilicide by inside to outside gradually
Increase, the germinating of crackle can be effectively delayed, block the extension of crackle, improve the thermal shock resistance of thermal barrier coating.Self-healing
The defects of oxidation reaction occurs at high temperature for grain, and the oxidation product of generation can fill stomata in coating, gap and micro-crack from
And achieve the effect that self-healing, the antioxygenic property of coating on the one hand can be improved, on the other hand, by regulating and controlling crack size, benefit
With the improved strain tolerance ability of crackle, maximizing improves the thermal shock resistance of thermal barrier coating, extends the service life of coating.
At the same time, laser technology eliminates plasma spraying and prepares the inherent shortcomings such as the stomata of thermal barrier coating, crackle, makes coating surface
Roughness be improved significantly, improve coating consistency and hardness.It is practical.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, this hair
Bright illustrative example and its explanation is used to explain the present invention, and is not constituted improper limitations of the present invention.
Fig. 1 is dam configuration body surface face structural schematic diagram of the invention；
Fig. 2 is the A-A schematic cross-sectional view of Fig. 1；
Fig. 3 is the cross-section structure of spraying state thermal barrier coating of the invention；
Fig. 4 is the cross-sectional structure of falling parabolic type of dam configuration body of the invention；
Fig. 5 is the distribution map of dam configuration body of the invention on thermal barrier coating surface.
In figure: 1, ceramic layer on surface；2, annular dykes and dams structural body；3, metal bonding coating；4, matrix.
Specific embodiment
Detailed content and its specific embodiment of the invention are further illustrated with reference to the accompanying drawing.
Referring to figs. 1 to 5, bionical dam configuration gradient coating of crack arrest anti-strip of the invention and preparation method thereof,
Including ceramic layer on surface, metal bonding coating and dam configuration body.Ceramic layer on surface is prepared by atmospheric plasma spraying technology, metal
Adhesive layer is prepared by Low Temperature High Oxygen-Air Fuel Spray technology, prepares different materials system in surface ceramii layer using laser technology
Dam configuration body.Yttrium oxide partially stabilized zirconia of the material of the dam configuration body by heterogeneity ratio, i.e. 7wt.%
Y2O3 partially stabilized ZrO2(7YSZ) and molybdenum disilicide composition.Self-healing particle molybdenum disilicide institute in dam configuration body of the present invention
Mass percent is accounted for be gradually increased from the inside to the outside, so as to form the thermal barrier coating with gradient characteristics dam configuration body,
The germinating and extension of crackle can effectively be blocked.Different materials are arranged due to using laser technology in the present invention in thermal barrier coating
The method of system dam configuration body forms scleroid dam configuration body and the spraying state ceramic coating of quality flexible relative
Reinforced structure with bipolar mixture alternating variation characteristic, delays the germinating of crackle in this way, has blocked the extension of crackle, improves
The thermal shock resistance of thermal barrier coating.At the same time, oxidation reaction, the oxidation product of generation occur at high temperature for self-healing particle
The defects of stomata in coating, gap and micro-crack can be filled, to achieve the effect that self-healing, on the one hand can improve coating
Antioxygenic property, on the other hand, by regulating and controlling crack size, using the improved strain tolerance ability of crackle, maximizing is improved
The thermal shock resistance of thermal barrier coating extends the service life of coating.In addition, laser technology, which eliminates plasma spraying, prepares thermal boundary
The inherent shortcomings such as stomata, the crackle of coating, make Coating Surface Roughness be improved significantly, improve coating consistency and hard
Degree.The bionical dam configuration gradient coating of crack arrest anti-strip of the invention includes ceramic layer on surface 1, metal bonding coating 3 and eskar
Dam structural body 2, the ceramic layer on surface 1 are set there are three annular dykes and dams structural body 2 of different sizes, described three annular dykes and dams knots
The cross section of structure body 2 be it is parabola shaped, three annular dykes and dams structural bodies are with one heart and depth is 100 μm~350 μm, three annulars
The width of dam configuration body is 1mm~3mm, and adjacent annular dam configuration body spacing is 1mm~4mm；Innermost annular dykes and dams
Structural body is 1mm~4mm away from circular specimen centre distance, outermost distance of the annular dykes and dams structural body away from circular specimen outer rim
For 1mm~3mm, and in thermal barrier coating the sum of the surface area of all annular dykes and dams structural bodies account for thermal barrier coating surface 10%~
70%；The material of the annular dykes and dams structural body 2 ZrO2(7YSZ partially stabilized by 7wt.%Y2O3) and molybdenum disilicide form, and
Mass percent shared by molybdenum disilicide is followed successively by 5%~10%, 10%~15%, 15%~20% in dam configuration body from the inside to the outside.
The preparation method of the bionical dam configuration gradient coating of crack arrest anti-strip of the invention, includes the following steps:
Step 1: routinely technique carries out cleaning and blasting treatment to 4 surface of matrix；
Step 2: the thermal barrier coating includes that ceramic layer on surface 1 and metal are viscous in the thermal barrier coating of matrix surface preparation thermal spraying state
Layer 3 is tied, when preparing thermal barrier coating, first metal bonding coating 3 is prepared on 4 surface of matrix, then prepares table on metal bonding coating 3
Face ceramic layer 1；
Step 3: carrying out the pre-heat treatment to thermal barrier coating；
Step 4: preparing annular dykes and dams structural body 2, three annular dykes and dams structural bodies on ceramic layer on surface using laser technology
With one heart and depth is 100 μm~350 μm, and the width of three annular dykes and dams structural bodies is 1mm~3mm, adjacent annular dam configuration
Body spacing is 1mm~4mm；Innermost annular dykes and dams structural body is 1mm~4mm away from circular specimen centre distance, outermost
Annular distance of the dykes and dams structural body away from circular specimen outer rim be 1mm~3mm, and in thermal barrier coating all dam configuration bodies surface
The sum of product accounts for the 10%~70% of thermal barrier coating surface.
The heating temperature of the pre-heat treatment is carried out at 500 DEG C~700 DEG C to thermal barrier coating described in step 3.
In laser technology described in step 4, laser uses rated power to swash for the Nd:YAG solid of 800W~1000W
Light device, the electric current of the laser are 60A~200A, and pulsewidth is 1ms~10ms, and frequency is 1Hz~20Hz, scanning speed 1mm/
S~5mm/s, adjacent laser radiation area overlapping rate are 10%~50%.
Mass percent shared by molybdenum disilicide is followed successively by 5%~10%, 10%~15% in annular dykes and dams structural body from the inside to the outside,
15%~20%.
The metal bonding coating 3 is made of the method for Low Temperature High Oxygen-Air Fuel Spray, and metal bonding coating with a thickness of
50 μm~120 μm.
The ceramic layer on surface 1 is made of the method for air plasma spraying, and ceramic layer on surface is with a thickness of 150 μm
~400 μm.
Embodiment 1:
The matrix 4 that the present embodiment uses is K417G high temperature alloy matrix.
Firstly, routinely technique carries out cleaning and blasting treatment to K417G high temperature alloy matrix surface.Then in matrix table
Wheat flour is for the thermal barrier coating of thermal spraying state, which includes ceramic layer on surface 1 and metal bonding coating 3, such as Fig. 1 and Fig. 2 institute
Show.When preparing thermal barrier coating, first preparing thickness on 4 surface of matrix using Low Temperature High Oxygen-Air Fuel Spray is about 50 μm
NiCrAlY metal bonding coating 3, it is about 200 μm that thickness is then prepared on metal bonding coating 3 using air plasma spraying
7wt.%Y2O3 partially stabilized ZrO2(7YSZ) ceramic layer on surface 1.Fig. 3 is the section structure for spraying state thermal barrier coating, can be seen
The defects of stomata, crackle is distributed in coating out.The pre-heat treatment heating temperature to thermal barrier coating is 500 DEG C, using specified function
Rate is that the Nd:YAG solid state laser of 800 W processes annular dykes and dams structural body 2 on thermal barrier coating, and the electric current of the laser is
100A, pulsewidth 5ms, frequency 1Hz, scanning speed are 1.2mm/s, and adjacent laser radiation area overlapping rate is 20%.It can from Fig. 4
To find out that the cross section of annular dykes and dams structural body 2 is parabola shaped；The surface topography of annular dykes and dams structural body is as shown in Figure 5.
The width of the annular dykes and dams structural body is 1.5mm, and the depth of the annular dykes and dams structural body is 210 μm.Adjacent annular dam configuration
Body spacing is 3mm, and innermost annular dykes and dams structural body is 3mm away from circular specimen centre distance, outermost annular dykes and dams knot
Distance of the structure body away from circular specimen outer rim is 2mm, and the sum of the surface area of all annular dykes and dams structural bodies accounts for heat in thermal barrier coating
The 45% of barrier coating surface.The annular dykes and dams structural body material ZrO2(7YSZ partially stabilized by 7wt.%Y2O3 from the inside to the outside) and two
Molybdenum silicide composition, wherein molybdenum disilicide proportion is followed successively by 5%, 10%, 15%.There is gradient characteristics dykes and dams knot what is prepared
In the thermal barrier coating of structure body, microhardness HV<840 of state coating, microhardness HV>1200 of annular dykes and dams structural body are sprayed.
The annular dykes and dams structural body formed using laser technology on thermal barrier coating surface, improves the surface roughness of coating, mentions
The high consistency and hardness of coating, the defects of eliminating the intrinsic stomata of Thermal Barrier Coating Layers Prepared By Plasma Spraying, crackle.
Embodiment 2:
The matrix 4 that the present embodiment uses is K417G high temperature alloy matrix.
Firstly, routinely technique carries out cleaning and blasting treatment to K417G high temperature alloy matrix surface.Then in matrix table
For wheat flour for the thermal barrier coating of thermal spraying state, which includes ceramic layer on surface 1 and metal bonding coating 3.It is applied preparing thermal boundary
When layer, the NiCrAlY metal bonding coating that thickness is about 100 μm is first prepared on 4 surface of matrix using Low Temperature High Oxygen-Air Fuel Spray
3, it is partially stabilized that the 7wt.%Y2O3 that thickness is about 250 μm is then prepared on metal bonding coating 3 using air plasma spraying
ZrO2(7YSZ) ceramic layer on surface 1.The pre-heat treatment heating temperature to thermal barrier coating is 700 DEG C, uses rated power for 1000
The Nd:YAG solid state laser of W processes annular dykes and dams structural body 2 on thermal barrier coating, and the electric current of the laser is 160A, pulsewidth
For 6ms, frequency 5Hz, scanning speed is 3.5mm/s, and adjacent laser radiation area overlapping rate is 35%.The annular dykes and dams structural body
Width be 1mm, the depth of the annular dykes and dams structural body is 265 μm.Adjacent annular dam configuration body spacing is 3mm, most inner side
Annular dykes and dams structural body away from circular specimen centre distance be 2.5mm, it is outermost annular dykes and dams structural body away from circular specimen outside
The distance of edge is 3mm, and the sum of the surface area of all annular dykes and dams structural bodies accounts for the 30% of thermal barrier coating surface in thermal barrier coating.
The annular dykes and dams structural body material ZrO2(7YSZ partially stabilized by 7wt.%Y2O3 from the inside to the outside) and molybdenum disilicide form, wherein
Molybdenum disilicide proportion is followed successively by 7.5%, 12.5%, 17.5%.In the thermal boundary with gradient characteristics dam configuration body prepared
In coating, microhardness HV > 1400 of annular dykes and dams structural body.
The foregoing is merely preferred embodiments of the invention, are not intended to restrict the invention, for the technology of this field
For personnel, the invention may be variously modified and varied.All any modification, equivalent substitution, improvement and etc. made for the present invention,
It should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of bionical dam configuration gradient coating of crack arrest anti-strip, especially suitable for thermal barrier coating, it is characterised in that: including table
Face ceramic layer (1), metal bonding coating (3) and annular dykes and dams structural body (2), the ceramic layer on surface (1) set that there are three sizes not
Same annular dykes and dams structural body (2), the cross section of described three annular dykes and dams structural bodies (2) are parabola shaped, three annulars
Dam configuration body is with one heart and depth is 100 μm~350 μm, and the width of three annular dykes and dams structural bodies is 1mm~3mm, adjacent ring
Shape dam configuration body spacing is 1mm~4mm；It is innermost annular dykes and dams structural body away from circular specimen centre distance be 1mm~
4mm, outermost annular distance of the dykes and dams structural body away from circular specimen outer rim is 1mm~3mm, and all annulars in thermal barrier coating
The sum of the surface area of dam configuration body accounts for the 10%~70% of thermal barrier coating surface；It is described annular dykes and dams structural body (2) material by
7wt.%Y2O3Partially stabilized ZrO2(7YSZ) and molybdenum disilicide composition, and from the inside to the outside in dam configuration body shared by molybdenum disilicide
Mass percent is followed successively by 5%~10%, 10%~15%, 15%~20%.
2. a kind of preparation method of the bionical dam configuration gradient coating of crack arrest anti-strip, characterized by the following steps:
Step 1: carrying out cleaning and blasting treatment to matrix (4) surface；
Step 2: the thermal barrier coating includes ceramic layer on surface (1) and metal in the thermal barrier coating of matrix surface preparation thermal spraying state
Adhesive layer (3) first prepares metal bonding coating (3) on matrix (4) surface, then in metal bonding coating when preparing thermal barrier coating
(3) ceramic layer on surface (1) is prepared on；
Step 3: carrying out the pre-heat treatment to thermal barrier coating；
Step 4: preparing annular dykes and dams structural body (2), three annular dam configurations on ceramic layer on surface using laser technology
Body is with one heart and depth is 100 μm~350 μm, and the width of three annular dykes and dams structural bodies is 1mm~3mm, adjacent annular dykes and dams knot
Structure body spacing is 1mm~4mm；Innermost annular dykes and dams structural body is 1mm~4mm, outermost away from circular specimen centre distance
Annular distance of the dykes and dams structural body away from circular specimen outer rim be 1mm~3mm, and in thermal barrier coating all dam configuration bodies table
The sum of area accounts for the 10%~70% of thermal barrier coating surface.
3. the preparation method of the bionical dam configuration gradient coating of crack arrest anti-strip according to claim 2, it is characterised in that:
The heating temperature of the pre-heat treatment is carried out at 500 DEG C~700 DEG C to thermal barrier coating described in step 3.
4. the preparation method of the bionical dam configuration gradient coating of crack arrest anti-strip according to claim 2, it is characterised in that:
In laser technology described in step 4, laser uses rated power for the Nd:YAG solid state laser of 800W~1000W, this swashs
The electric current of light device is 60A~200A, and pulsewidth is 1ms~10ms, and frequency is 1Hz~20Hz, and scanning speed is 1mm/s~5mm/s,
Adjacent laser radiation area overlapping rate is 10%~50%.
5. the preparation method of the bionical dam configuration gradient coating of crack arrest anti-strip according to claim 2, it is characterised in that:
Mass percent shared by molybdenum disilicide is followed successively by 5%~10% in annular dykes and dams structural body from the inside to the outside, 10%~15%, 15%~
20%。
6. the preparation method of the bionical dam configuration gradient coating of crack arrest anti-strip according to claim 2, it is characterised in that:
The metal bonding coating (3) is made of the method for Low Temperature High Oxygen-Air Fuel Spray, and metal bonding coating with a thickness of 50 μm~
120μm。
7. the preparation method of the bionical dam configuration gradient coating of crack arrest anti-strip according to claim 2, it is characterised in that:
The ceramic layer on surface (1) is made of the method for air plasma spraying, and ceramic layer on surface is with a thickness of 150 μm~400 μ
m。
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