CN109504932A - A kind of preparation method of resistance to CMAS high temperature corrosion composite thermal barrier coating - Google Patents
A kind of preparation method of resistance to CMAS high temperature corrosion composite thermal barrier coating Download PDFInfo
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- CN109504932A CN109504932A CN201910043664.9A CN201910043664A CN109504932A CN 109504932 A CN109504932 A CN 109504932A CN 201910043664 A CN201910043664 A CN 201910043664A CN 109504932 A CN109504932 A CN 109504932A
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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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- 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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Abstract
The present invention is a kind of preparation method of resistance to CMAS high temperature corrosion composite thermal barrier coating.This method is first by LZ ceramic powder and Al2O3Powder carries out mechanical mixture, and LZ/Al is made using ultrasonic vibration2O3Composite powder, then Al has been synthesized using plasma spraying2O3LZ/Al of the content 5~30%2O3Composite coating.The present invention improves TBCs thermal shock resistance, overcomes the defect that corrosion resistance of the coating under CMAS environment is lost.
Description
Technical field
Technical solution of the present invention is related to using LZ/Al2O3To the plating of nickel base superalloy, specifically LZ/Al2O3
The preparation method of composite coating.
Background technique
Thermal barrier coating (Thermal Barrier Coatings, TBCs) has been widely used in ground gas turbine and boat
In the high-temperature component of empty engine, barrier metal component is directly contacted with high-temperature fuel gas, with the multi-functional matrix material of effective protection
Expect [1-3].However, when operating temperature is higher than, originally at a lower temperature without the deposit CMAS (CaO- of too big harm
MgO-Al2O3-SiO2) be deposited on 1200 DEG C and can even more melt under high temperature, wetting coating surface, prolonged high temperature meeting
The mobility for improving melting CMAS, causes it to infiltrate through in ceramic layer heterogeneous microstructure.In cooling procedure, CMAS solidifies shape
At the vitreum of rigidity, the porosity and strain tolerance of coating are reduced, the thermal conductivity of coating is improved, greatly reduces coating
Heat-insulated safeguard function, so as to cause coating failure.Now widely used heat barrier coat material is to use Y2O3Stable ZrO2
(YSZ), YSZ coating is utilized for many years because of its good heat-proof quality and longer service life.But YSZ coating is only preferably following
It is used for a long time, at higher temperatures, phenomena such as coating will appear sintering and phase transformation, in addition, being also subjected to very harmful CMAS
Corrosion, these problems, especially CMAS corrosion, can directly result in coating failure.TBCs is invaded in order to alleviate CMAS deposit
Erosion, higher turbine inlet temperature (TIT) will be had by having carried out the following advanced aero-engine of correlative study both at home and abroad, to adapt to it
Development, it is necessary to find more stable thermal conductivity lower heat barrier coat material under high temperature environment and substitute YSZ.La2Zr2O7
(LZ) there is extremely low thermal conductivity and excellent phase stability, be generally considered a kind of very promising novel thermal boundary painting
Layer material.Have many studies have shown that LZ thermal boundary, which is coated in heat-insulated and high-temperature stability etc., to be had significantly compared with coating
Superiority.However since the thermal expansion coefficient (CTE) of LZ and adhesive layer NiCoCrAlY is different (respectively), in Thermal Cycling
In, it is easy to cause protective layer to peel off, so as to cause TBCs failure.During CMAS penetrates into, a large amount of Ca2+、Si4+It is consumed shape
At stable compound anorthite, front end is reacted in CMAS, fusant is with Mg2+、Al3+Based on, Al3+Increase can accelerate
The generation of high melting compound spinelle prevents CMAS fusant to form the defence line for stablizing densification in CMAS reaction front end
It penetrates further into.It therefore, can be by adding " the second phase " Al into LZ coating2O3Improve the thermal shock cycle life of TBCs, together
Corrosion resistance of the Shi Zengjia coating under CMAS environment.
Currently, both at home and abroad about preparation Al2O3The main method of coating and LZ coating has plasma spraying method, physics coating
Method, vapour deposition process.
(1) plasma spraying method: i.e. using plasma flame flow as heat source and power source, heating, accelerated material, (including
Powder, drop) carry out thermal spraying process.CN201510691307.5 discloses a kind of preparation of high-performance thermal barrier coating
Method, specifically 4YSZ (4mol%Y2O3Stablize ZrO2) thermal barrier coating and preparation method thereof.Using colloidal sol-spray pyrolysis
The preparation of method synthesis technology has the 4YSZ powder of fine nanostructure, the uniform pure tetragonal phase of component, then successively through spraying dry
Dry granulation, screening and air plasma spraying (APS) prepares coating.Coating prepared by the present invention is ingredient uniformly pure tetragonal phase
Nanostructure, preparation process letter better than the thermal diffusion coefficient low and high temperature phase stability and thermal shock resistance of traditional YSZ coating
The advantages that single and at low cost.Coating of the invention is more advantageous to the efficiency and operating temperature for improving turbogenerator, and extension is started
Machine service life.But castering action is not played for the resistance to CMAS corrosivity of coating.A kind of environment resistant of CN108004543A
Deposit corrosion thermal barrier coating and preparation method thereof.Vacuum arc plating, plasma spraying or super are followed successively by high temperature alloy matrix
Velocity of sound sprays MCrAlY metal bond coating, plasma spraying or electro beam physics vapour deposition YSZ ceramic topcoats, magnetron sputtering
Or the pure Pt surface layer of multi-arc ion coating noble metal, LZAlY metal bond coating is with a thickness of 0.05~0.15mm, YSZ ceramic plane thickness
Degree is 30 μm~100 μm, and the pure Pt surface thickness of noble metal is 10 μm~60 μm.Using MCrAlY bond coating, YSZ ceramic topcoats
With the thermal barrier coating system of precious metals pt surface layer composition, it is effectively prevent the corrosion of CMAS, but due to the thermal expansion system of ceramic topcoats
Several and thermal conductivity relationship, TBCs thermal shock resistance do not improve, and the method complex process, higher cost.
(2) physics cladding process: obtained coating material will be needed to be configured to certain slurries or certain viscose glue is added
Then liquid is directly brushed in matrix surface, directly forms coating in matrix surface by drying or being heat-treated.
CN201310517848.7 discloses a kind of technique of metal base surface aluminum oxide coating layer and preparation method thereof, selected gold
Belonging to matrix is the alloy materials such as carbon steel, the structural steel of Ge Shi hardness < 40.First by water, the organic alcohol compound of aluminium and inorganic acid
Proportionally heating stirring obtains alumina sol, colloidal sol is carried out hydro-thermal process later, then the colloidal sol after hydro-thermal process is existed
Metal base surface carries out repeatedly coating drying, carries out calcination processing in last 500 DEG C of hot environments below, obtaining has one
Determine thickness, fine and close γ phase alumina coating.Although the coating simple process coated by physics, obtained painting
Layer bond strength is significant lower, and thermal shock resistance is poor.
(3) physical vaporous deposition: i.e. PVD method, it is corresponding with chemical vapour deposition technique, refer under vacuum conditions, adopts
With physical method, material source-solid or liquid surface are gasificated into gaseous atom, molecule or partial ionization into ion, and passed through
Low-pressure gas or plasma process have the technology of the film of certain specific function in matrix surface deposition.
CN201310048106.4 disclose the invention discloses a kind of bivalent metal ion adulterate La2Ce2O7Thermal barrier coating ceramics material
Material, the bivalent metal ion adulterate La2Ce2O7Thermal barrier coating ceramic material chemical formula is (La0.95M0.05)2Ce2O6.95, wherein M
For Ca2+、Mg2+Or Sr2+.Bivalent metal ion of the invention adulterates La2Ce2O7Its crystal structure of thermal barrier coating ceramic material is scarce
Property fluorite structure is fallen into, powder granule degree is 50~150nm, it is completely potential to be used as novel thermal barrier coating superficial layer ceramic material,
But its bond strength is lower, and thermal shock resistance is poor.
Summary of the invention
It is an object of the present invention to provide LZ/Al for deficiency existing for current techniques2O3The preparation method of composite coating.It should
Method is first by LZ ceramic powder and Al2O3Powder carries out mechanical mixture, and LZ/Al is made using ultrasonic vibration2O3Composite powder, then adopt
Al has been synthesized with plasma spraying2O3LZ/Al of the content in 5-30%2O3Composite coating.The present invention improves TBCs anti-thermal shock
Property, overcome the defect that corrosion resistance of the coating under CMAS environment is lost.
The technical scheme adopted by the invention is that:
A kind of preparation method of resistance to CMAS high temperature corrosion composite thermal barrier coating, comprising the following steps:
Step 1: being formulated for the LZ/Al of plasma spraying2O3Composite powder；
By LZ powder and Al2O3Powder mixing composition mixed powder, adds binder later；Then 15~25 points of ultrasonic vibration
Clock, then LZ/Al is obtained by mechanical mixture2O3Composite powder；
Wherein, the granularity of LZ powder is 20 microns~40 microns, Al2O3The granularity of powder is 0.07 micron~1 micron；Mixture
In powder, Al2O powder accounts for the 5~30% of compound powder gross mass；Bonding agent mass ratio is compound powder: binder=80~100:
20~1；
Second step, metal matrix material pretreatment:
Blasting treatment is carried out to the metal matrix material surface of required coating, then the metallic matrix material after blasting treatment
Expect that surface sprays bond coating, completes metal matrix material pretreatment；
Third step, LZ/Al2O3The preparation of composite coating
Using the method for plasma spraying, by LZ/Al obtained in the first step2O3Composite powder, which is sprayed in second step, to be passed through
Pretreated metal matrix material surface, coating layer thickness is at 150~250 μm, so that preparation forms LZ/Al2O3Composite coating；
Wherein, spray power is in 35~40KW, and 80~120mm of spray distance, argon gas powder feeding throughput is 0.3~1.5m3/
H, hydrogen flowrate 1.0m3/h。
The binder is polyvinyl alcohol or methylcellulose.
The bond coating material is NiCoCrAlY or NiCrAlYTa or NiCoCrAlY+Al2O3, wherein mass ratio
For NiCoCrAlY:Al2O3=70:30；Thickness is at 50~100 μm.
The metal material matrix is cast iron or nickel base superalloy.
The nickel base superalloy is preferably GH3044 nickel base superalloy.
The LZ/Al2O3In the preparation method of composite coating, related raw material is working material or obtains commercially available from
?.
Beneficial effects of the present invention are as follows:
Compared with prior art, present invention substantive distinguishing features outstanding are: the method for the present invention utilizes LZ/Al2O3Composite powder is logical
Cross the LZ/Al that plasma spray is coated in one layer of environmental corrosion of resistance to CMAS of surface formation of metal material2O3Composite coating.Meanwhile gained
The porosity of composite coating is lower, and thermal shock resistance is preferable.
Compared with prior art, marked improvement of the invention is:
(1) present invention uses LZ/Al for the first time2O3Composite powder carries out plating to metal base surface, by the way that different content is added
Al2O3Ceramic powder applies resistance to CMAS corrosive nature at high temperature to improve LZ thermal boundary.
(2) using the LZ/Al of this method preparation2O3Composite coating consistency with higher, high temperature corrosion, anti-height
Warm oxidisability and thermal shock resistance.Specifically:
First passage adds a certain proportion of Al2O3Powder is sufficiently mixed it with LZ powder
It is even, metal material surface is then coated in by plasma spray and forms LZ/Al2O3It is single can to significantly improve tradition for composite coating
High-temperature corrosion resistance performance of the LZ coating under CMAS environment.Observe coating SEM photograph it can also be seen that coating and matrix knot
It closes closely, coating porosity is less, i.e., porosity is relatively low, and consistency is higher.Fig. 4 be the obtained LZ of this implementations and
Al2O3The LZ/Al of synthesis2O3Dynamic potential polarization curve figure of the composite coating in the rainwater environment that electrolyte solution is PH=5.6
It is compared with the dynamic potential polarization curve figure of LZ coating.From the graph, it is apparent that under the conditions of the rainwater of PH=5.6, LZ's
Corrosion electric current density is higher than LZ/Al2O3, this shows LZ/Al2O3Resistance to CMAS performance is better than LZ.That is Al2O3Addition significantly improve
Corrosion resistance of the LZ coating under CMAS environment.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is LZ/Al obtained by embodiment 52O3The SEM of composite powder schemes.
Fig. 2 is LZ/Al obtained by embodiment 52O3(300 times) amplification SEM figures of low power of composite coating.
Fig. 3 is LZ/Al obtained by embodiment 52O3(1000 times) amplification SEM figures of high power of composite coating.
Fig. 4 is LZ and Al obtained by this implementation 52O3The LZ/Al of synthesis2O3Composite coating is PH=in electrolyte solution
The dynamic potential polarization curve figure of dynamic potential polarization curve figure and LZ coating in 5.6 rainwater environment compares.
Specific embodiment
LZ powder of the present invention is well known materials, is zirconic acid lanthanum powder (La2O3) and zirconia powder (ZrO2) according to mixing after
It is the composite powder that can be used for plasma spraying through solid-phase sintering.Following embodiment is specially zirconic acid lanthanum powder (La2O3) and zirconia powder
(ZrO2) be 1:2 composite powder.
Embodiment 1
Step 1: being formulated for the LZ/Al of plasma spraying2O3Composite powder；
By LZ powder of the particle size range between 15 microns~40 microns, particle size range between 0.07 micron~1 micron
Al2O3Powder is uniformly mixed into compound powder.Wherein, Al2O3The weight percent that powder accounts for raw material powder gross mass is that 5%, LZ powder accounts for original
The weight percent of feed powder gross mass is 95%, Al2O3Weight ratio between LZ is then 5:95, then is uniformly mixed into weight
Than being feed powder: polyvinyl alcohol=100:1 binder ultrasonic vibration 20 minutes, then passes through mechanical mixture normal agitation
Thus 90min is configured to the LZ/Al for plasma spraying2O3Composite powder；
Second step, metal matrix material pretreatment:
Blasting treatment is carried out to the GH3044 nickel base superalloy surface of required coating, then the metal after blasting treatment
Substrate material surface sprays NiCoCrAlY bottom.Coating layer thickness is at 70 μm or so, spray power 30KW, 120 ㎜ of spray distance.
Thus metal matrix material pretreatment is completed；
Third step, LZ/Al2O3The preparation of composite coating
Using the method for plasma spraying, selected technological parameter is: power 35KW, 100 ㎜ of spray distance, and argon gas is sent
Powder flow is 0.5m3/ h, hydrogen flowing quantity 1.0m3/h.The LZ/Al for being used for thermal spraying that will be made in the first step2O3Composite powder
Be sprayed in second step by pretreated GH3044 nickel base superalloy matrix surface, coating layer thickness at 200 μm or so, thus
Preparation forms LZ/Al2O3Composite coating.
Embodiment 2
Step 1: being formulated for the LZ/Al of plasma spraying2O3Composite powder；
By LZ powder of the particle size range between 15 microns~40 microns, particle size range between 0.07 micron~1 micron
Al2O3Powder is uniformly mixed into compound powder.Wherein, Al2O3The weight percent that powder accounts for raw material powder gross mass is that 10%, LZ powder accounts for
The weight percent of raw material powder gross mass is 90%, Al2O3Weight ratio between LZ is then 10:90, then is uniformly mixed into weight
Measuring ratio is feed powder: polyvinyl alcohol=100:1 binder, ultrasonic vibration 20 minutes, then passes through mechanical mixture normal agitation
Thus 90min is configured to the LZ/Al for plasma spraying2O3Composite powder；
Second step, metal matrix material pretreatment:
Blasting treatment is carried out to the GH3044 nickel base superalloy surface of required coating, then the metal after blasting treatment
Substrate material surface sprays NiCoCrAlY bottom.Coating layer thickness is at 70 μm or so, spray power 30KW, 120 ㎜ of spray distance.
Thus metal matrix material pretreatment is completed；
Third step, LZ/Al2O3The preparation of composite coating
Using the method for plasma spraying, selected technological parameter is: power 35KW, 100 ㎜ of spray distance, and argon gas is sent
Powder flow is 0.5m3/ h, hydrogen flowing quantity 1.0m3/h.The LZ/Al for being used for thermal spraying that will be made in the first step2O3Composite powder
Be sprayed in second step by pretreated GH3044 nickel base superalloy matrix surface, coating layer thickness at 200 μm or so, thus
Preparation forms LZ/Al2O3Composite coating.
Embodiment 3
Step 1: being formulated for the LZ/Al of plasma spraying2O3Composite powder；
By LZ powder of the particle size range between 15 microns~40 microns, particle size range between 0.07 micron~1 micron
Al2O3Powder is uniformly mixed into compound powder.Wherein, Al2O3The weight percent that powder accounts for raw material powder gross mass is that 15%, LZ powder accounts for
The weight percent of raw material powder gross mass is 85%, Al2O3Weight ratio between LZ is then 15:85, then is uniformly mixed into weight
Measuring ratio is feed powder: polyvinyl alcohol=100:1 binder, ultrasonic vibration 20 minutes, then passes through mechanical mixture normal agitation
Thus 90min is configured to the LZ/Al for plasma spraying2O3Composite powder；
Second step, metal matrix material pretreatment:
Blasting treatment is carried out to the GH3044 nickel base superalloy surface of required coating, then the metal after blasting treatment
Substrate material surface sprays NiCoCrAlY bottom.Coating layer thickness is at 70 μm or so, spray power 30KW, 120 ㎜ of spray distance.
Thus metal matrix material pretreatment is completed；
Third step, LZ/Al2O3The preparation of composite coating
Using the method for plasma spraying, selected technological parameter is: power 35KW, 100 ㎜ of spray distance, and argon gas is sent
Powder flow is 0.5m3/ h, hydrogen flowing quantity 1.0m3/h.The LZ/Al for being used for thermal spraying that will be made in the first step2O3Composite powder
Be sprayed in second step by pretreated GH3044 nickel base superalloy matrix surface, coating layer thickness at 200 μm or so, thus
Preparation forms LZ/Al2O3Composite coating.
Embodiment 4
Step 1: being formulated for the LZ/Al of plasma spraying2O3Composite powder；
By LZ powder of the particle size range between 15 microns~40 microns, particle size range between 0.07 micron~1 micron
Al2O3Powder is uniformly mixed into compound powder.Wherein, Al2O3The weight percent that powder accounts for raw material powder gross mass is that 20%, LZ powder accounts for
The weight percent of raw material powder gross mass is 80%, Al2O3Weight ratio between LZ is then 20:80, then is uniformly mixed into weight
Measuring ratio is feed powder: polyvinyl alcohol=100:1 binder, ultrasonic vibration 20 minutes, then passes through mechanical mixture normal agitation
Thus 90min is configured to the LZ/Al for plasma spraying2O3Composite powder；
Second step, metal matrix material pretreatment:
Blasting treatment is carried out to the GH3044 nickel base superalloy surface of required coating, then the metal after blasting treatment
Substrate material surface sprays NiCoCrAlY bottom.Coating layer thickness is at 70 μm or so, spray power 30KW, 120 ㎜ of spray distance.
Thus metal matrix material pretreatment is completed；
Third step, LZ/Al2O3The preparation of composite coating
Using the method for plasma spraying, selected technological parameter is: power 35KW, 100 ㎜ of spray distance, and argon gas is sent
Powder flow is 0.5m3/ h, hydrogen flowing quantity 1.0m3/h.The LZ/Al for being used for thermal spraying that will be made in the first step2O3Composite powder
Be sprayed in second step by pretreated GH3044 nickel base superalloy matrix surface, coating layer thickness at 200 μm or so, thus
Preparation forms LZ/Al2O3Composite coating.
Embodiment 5
Step 1: being formulated for the LZ/Al of plasma spraying2O3Composite powder；
By LZ powder of the particle size range between 15 microns~40 microns, particle size range between 0.07 micron~1 micron
Al2O3Powder is uniformly mixed into compound powder.Wherein, Al2O3The weight percent that powder accounts for raw material powder gross mass is that 30%, LZ powder accounts for
The weight percent of raw material powder gross mass is 70%, Al2O3Weight ratio between LZ is then 30:70, then is uniformly mixed into weight
Measuring ratio is feed powder: polyvinyl alcohol=100:1 binder, ultrasonic vibration 20 minutes, then passes through mechanical mixture normal agitation
Thus 90min is configured to the LZ/Al for plasma spraying2O3Composite powder；
Second step, metal matrix material pretreatment:
Blasting treatment is carried out to the GH3044 nickel base superalloy surface of required coating, then the metal after blasting treatment
Substrate material surface sprays NiCoCrAlY bottom.Coating layer thickness is at 70 μm or so, spray power 30KW, 120 ㎜ of spray distance.
Thus metal matrix material pretreatment is completed；
Third step, LZ/Al2O3The preparation of composite coating
Using the method for plasma spraying, selected technological parameter is: power 35KW, 100 ㎜ of spray distance, and argon gas is sent
Powder flow is 0.5m3/ h, hydrogen flowing quantity 1.0m3/h.The LZ/Al for being used for thermal spraying that will be made in the first step2O3Composite powder
Be sprayed in second step by pretreated GH3044 nickel base superalloy matrix surface, coating layer thickness at 200 μm or so, thus
Preparation forms LZ/Al2O3Composite coating.
4th step, LZ/Al2O3The corrosion resistance of composite coating is tested
It is tested using three electrode test systems in Electrochemical Comprehensive Tester, includes reference electrode, work in system
Make electrode and auxiliary electrode.Sample with composite coating is packaged, coat side to be measured is external, other faces epoxy resin
Encapsulation.Coating corrosion liquid use PH=5.6 Simulated rainwater, open test 1800s, polarization -0.5~+0.5v. of section use from
In Fig. 4, it is apparent that under the conditions of the rainwater of PH=5.6, the corrosion electric current density of LZ is higher than LZ/Al2O3, this shows
LZ/Al2O3Resistance to CMAS performance is better than LZ.That is Al2O3Addition significantly improve corrosion resistance of the LZ coating under CMAS environment
Energy.
Fig. 1 is LZ/Al made from the present embodiment 52O3The SEM of composite powder schemes.As can be seen that granular size is moderate, reunite
Property it is good, have preferable mobility, be suitble to plasma spraying.
Fig. 2 is LZ/Al made from the present embodiment 52O3300 times of SEM of composite coating schemes.It can be seen that coating consistency
Height, coating porosity are lower.
Fig. 3 is the obtained LZ/Al of the present embodiment 52O31000 times of SEM of composite coating schemes.From magnification at high multiple SEM
As can be seen that river shape stacked distribution is presented in coating in figure.LZ/Al2O3Composite powder is uniformly laminated after plasma flame flow heats
It sprawls to form composite coating, the porosity of coating is lower, and the corrosion resistance under CMAS environment is further enhanced.
Embodiment 6
Step 1: being formulated for the LZ/Al of plasma spraying2O3Composite powder；
By LZ powder of the particle size range between 15 microns~40 microns, particle size range between 0.07 micron~1 micron
Al2O3Powder is uniformly mixed into compound powder.Wherein, Al2O3The weight percent that powder accounts for raw material powder gross mass is that 40%, LZ powder accounts for
The weight percent of raw material powder gross mass is 60%, Al2O3Weight ratio between LZ is then 40:60, then is uniformly mixed into weight
Measuring ratio is feed powder: polyvinyl alcohol=100:1 binder, ultrasonic vibration 20 minutes, then passes through mechanical mixture normal agitation
Thus 90min is configured to the LZ/Al for plasma spraying2O3Composite powder；
Second step, metal matrix material pretreatment:
Blasting treatment is carried out to the GH3044 nickel base superalloy surface of required coating, then the metal after blasting treatment
Substrate material surface sprays NiCoCrAlY bottom.Coating layer thickness is at 70 μm or so, spray power 30KW, 120 ㎜ of spray distance.
Thus metal matrix material pretreatment is completed；
Third step, LZ/Al2O3The preparation of composite coating
Using the method for plasma spraying, selected technological parameter is: power 35KW, 100 ㎜ of spray distance, and argon gas is sent
Powder flow is 0.5m3/ h, hydrogen flowing quantity 1.0m3/h.The LZ/Al for being used for thermal spraying that will be made in the first step2O3Composite powder
Be sprayed in second step by pretreated GH3044 nickel base superalloy matrix surface, coating layer thickness at 200 μm or so, thus
Preparation forms LZ/Al2O3Composite coating.
Embodiment 7
Except bond coating material is NiCoCrAlY+Al2O3(wherein NiCoCrAlY and Al2O3Mass ratio be 70%:
30%), other techniques are the same as embodiment 5
Embodiment 8
Removing coating spray power is outside 40KW, other techniques are the same as embodiment 5.
Embodiment 9
Except metal matrix material is cast iron, bond coating is except NiCoCrAlYTa bottom, other techniques are the same as embodiment 5.
The explanation of embodiment 5 works as Al2O3When content reaches 30%, LZ/Al2O3Composite ceramic layer can effectively accelerate CMAS
The interaction of fusant and ceramic layer leads to its rapid crystallization, improves the corrosivity of its resistance to CMAS at high temperature.Embodiment 1-
The experimental result of embodiment 4 and 5 difference of embodiment are unobvious, and with Al2O3The increase of content, LZ/Al2O3Composite ceramic layer
CMAS corrosive effect is stopped to be more obvious.Work as Al2O3When content reaches 30% (embodiment 5), LZ/Al2O3Composite ceramic layer energy ratio
Relatively efficiently prevent the infiltration of CMAS.The LZ/Al of embodiment 7- embodiment 92O3Composite ceramic layer has also reached anti-CMAS corrosion
Effect.And embodiment 6 is due to Al2O3Excessively to 40%, instead results in coating and etch pit and part stripping not of uniform size occur
It falls, to cause LZ/Al2O3The anti-CMAS corrosivity decline of composite ceramic layer.
Raw material described in above-described embodiment is from commercially available, described sand blasting process, the laminated golden bottom of spraying one
Layer process and plasma spray coating process are technique known to this field is existing.
Unaccomplished matter of the present invention is well-known technique.
Claims (5)
1. a kind of preparation method of resistance to CMAS high temperature corrosion composite thermal barrier coating, it is characterized in that method includes the following steps:
Step 1: being formulated for the LZ/Al of plasma spraying2O3Composite powder；
By LZ powder and Al2O3Powder mixing composition mixed powder, adds binder later；Then ultrasonic vibration 15 ~ 25 minutes, then
LZ/Al is obtained by mechanical mixture2O3Composite powder；
Wherein, the granularity of LZ powder is 20 microns~40 microns, Al2O3The granularity of powder is 0.07 micron~1 micron；In compound powder,
Al2O powder accounts for the 5~30% of compound powder gross mass；Bonding agent mass ratio is compound powder: binder=80 ~ 100:20 ~ 1；
Second step, metal matrix material pretreatment:
Blasting treatment is carried out to the metal matrix material surface of required coating, then the metal matrix material table after blasting treatment
Face sprays bond coating, completes metal matrix material pretreatment；
Third step, LZ/Al2O3The preparation of composite coating
Using the method for plasma spraying, by LZ/Al obtained in the first step2O3Composite powder is sprayed in second step by pre- place
The metal matrix material surface of reason, coating layer thickness is at 150 ~ 250 μm, so that preparation forms LZ/Al2O3Composite coating；
Wherein, spray power is in 35 ~ 40KW, and 80 ~ 120mm of spray distance, argon gas powder feeding throughput is 0.3 ~ 1.5m3/ h, hydrogen flowrate
For 1.0m3/h。
2. the preparation method of resistance to CMAS high temperature corrosion composite thermal barrier coating as described in claim 1, it is characterized in that described is viscous
Tying agent is polyvinyl alcohol or methylcellulose.
3. the preparation method of resistance to CMAS high temperature corrosion composite thermal barrier coating as described in claim 1, it is characterized in that the bonding
Primer is NiCoCrAlY or NiCrAlYTa or NiCoCrAlY+Al2O3, wherein mass ratio NiCoCrAlY:
Al2O3=70:30；Thickness is at 50-100 μm.
4. the preparation method of resistance to CMAS high temperature corrosion composite thermal barrier coating as described in claim 1, it is characterized in that the gold
Belonging to material matrix is cast iron or nickel base superalloy.
5. the preparation method of resistance to CMAS high temperature corrosion composite thermal barrier coating as claimed in claim 4, it is characterized in that the nickel
Based high-temperature alloy is GH3044 nickel base superalloy.
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| CN104630688A (en) * | 2015-01-23 | 2015-05-20 | 华中科技大学 | Method for preparing gradient thermal barrier coating |
| CN105755418A (en) * | 2016-03-23 | 2016-07-13 | 西安交通大学 | Ceramic fiber/crystal whisker reinforced composite thermal barrier coating and preparation method thereof |
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