CN108265259A - It is a kind of for protective coating of TiAl alloy and preparation method thereof - Google Patents
It is a kind of for protective coating of TiAl alloy and preparation method thereof Download PDFInfo
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- CN108265259A CN108265259A CN201711451929.6A CN201711451929A CN108265259A CN 108265259 A CN108265259 A CN 108265259A CN 201711451929 A CN201711451929 A CN 201711451929A CN 108265259 A CN108265259 A CN 108265259A
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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
-
- 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
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- 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
-
- 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
Abstract
It is a kind of for protective coating of TiAl alloy and preparation method thereof.The protective coating for TiAl alloy prepares tie coat using plasma spraying method on TiAl matrix alloys surface, and ceramic coating is prepared on the tie coat surface；Alloy antioxygenic property can be effectively improved by coating, while keep the mechanical property of TiAl alloy, to meet it as structural material requirement in a high temperauture environment, improve the antioxygenic property of alloy by external ceramic coating, add in suitable TiO2The defects of coating porosity is big, compactness is poor can be improved；And tie coat can not only enhance alloy and apply the bond strength of interlayer, can also solve due to the not fine and close caused oxygen atom infiltration problem of ceramic coating, further enhance the antioxygenic property of alloy.Meanwhile process of the present invention is simple, and it is easy to operation, it is efficient.
Description
Technical field
The present invention relates to a kind of antioxidant coating for metal, specifically using plasma spraying method in TiAl alloy
Surface prepares a kind of high-temperature oxidation resistant coating, belongs to thermal spraying technical field of surface.
Background technology
With the rapid development of Aeronautics and Astronautics industry, requirement of the Aeronautics and Astronautics aircraft to its engine is more and more tighter
Lattice.Turbo blade is the kernel component of aero-engine, it be constantly in high temperature, high pressure, high speed exhaust gas corrosion building ring
In border, the repeats such as centrifugal force, aerodynamic force, temperature stress load and dynamic load effect, Service Environment very severe subject.
The high-temperature structural material that this requirement uses has the performance characteristics such as high temperature resistant, high specific strength and specific stiffness, to meet first precession
Power apparatus and the needs of course of new aircraft development.TiAl alloy is a kind of Novel light high-strength structural material, it have high-melting-point,
The advantages that low-density, good mechanical property is the high-temperature structural material of less than 750 DEG C great application prospects.In practical application
In, also there are some urgent problems to be solved in TiAl alloy, such as：Application temperature up to 800 DEG C and more than when, alloy can go out
The phenomenon that now antioxygenic property is insufficient；There is relatively low elevated temperature strength in 1000 DEG C of high-temperature components used above；Alloy
Hardness is relatively low, and wear resistance is poor etc..Currently it is broadly divided into about the research of TiAl alloy：1. it is closed by adding
Gold element and processing technology regulate and control alloy interior tissue, to improve alloy property.2. by process for treating surface, improve alloy
Surface property improves alloy high-temp antioxygenic property, wearability and heat and corrosion resistant performance.
Document " Mechanical properties and oxidation resistance of plasma-sprayed
multilayered Al2O3/ZrO2It is proposed in thermal barrier coatings. ", Al is prepared in alloy surface2O3/
ZrO2Thermal barrier coating significantly improves the mechanical performance and antioxygenic property of alloy surface；But the porosity of coating is higher, coating
Internal stress is uneven in cooling procedure, and coating surface is caused to generate micro-crack.
In document " Improvement of Tribological Behavior of Ti -6Al -4V Alloy Using
Nanostructured NbSi2and NbSi2–Al2O3It is proposed in Plasma Spray Coating. ", in titanium alloy surface system
Standby NbSi2And NbSi2–Al2O3Composite coating, NbSi2The fusing degree of powder in spraying process can be improved, reduces the hole of coating
Rate improves coating consistency.But NbSi2And NbSi2–Al2O3The bond strength of composite coating and titanium alloy substrate is not high enough,
The service life of practical engineering application floating coat is limited.
Zhou Chungen et al. (Publication No. CN 101121308A) in publication invention is proposed, in Nb alloy surface systems
Standby Al2O3/ Al-Si-Cr composite coatings, Al2O3Coating is between Al-Si-Cr mixed layers and matrix.Surface A l-Si-Cr coatings
Al can be generated under high temperature environment2O3、SiO2And Cr2O3Mixed oxide layer improves the anti-oxidant service life of alloy.But coating table
Layer is Al-Si-Cr mixed layers, and hardness is low, rub resistance and corrosion resistance are poor, inadequate in the practical engineering application floating coat service life
It is long.
(Publication No. CN 1490360A) is proposed Sun Chao et al. in publication invention, and thermal boundary is prepared in alloy surface
Coating.Including MCrAlY tie coats, Ni-Al diffusion barrier coatings, ZrO2-8Y2O3Ceramic coating.ZrO2-8Y2O3Ceramic coating
With the excellent properties such as high temperature resistant, heat shock resistance, wear-resistant, Ni-Al diffusion barrier coatings can effectively stop the expansion of oxygen atom
It dissipates, further improves anti-oxidant speed of composite performance.This composite coating is made of three parts, and preparation process is complicated；And coating system
Standby to use detonation flame spraying technique, manufacturing cost is higher.
(Publication No. CN 1069447934A) is proposed beam love people et al. in publication invention, is prepared in alloy surface
Ni-Al tie coats and α-Al2O3Ceramic coating.Compared to general γ-Al2O3Coating, α-Al2O3Coating has higher resistance to
Polishing machine and high-temperature stability.But α-Al2O3Coating fusing point is high, and easily fusing is incomplete in Plasma Spraying Process Using, generates
The defects of hole, hole, micro-crack, causes coating not fine and close, influences coating performance.
Show to be concentrated mainly in antioxidant coating research field at present in above-mentioned document and patent of invention prepare it is compound
Coating to carry out antioxidant defense to alloy.Tie coat and effect coating are combined, tie coat plays connection matrix with making
With the effect of coating, internal stress is discharged, enhances bond strength.Effect coating is mostly ceramic coating, and ceramic coating has excellent
Antioxygenic property, corrosion resistance, good chemical stability.But ceramic coating is due to its fusing point height, in spraying process
Endless running down situation easily occurs, the porosity for leading to coating is higher, and coating internal stress is unevenly distributed, and coating surface generates micro-
Crackle generates deleterious effect to coating performance.It is therefore necessary to be improved to coating composition, and then improve the property of coating
Energy.
Invention content
Porosity to overcome coating in the prior art is higher, and coating internal stress is unevenly distributed, coating surface
The deficiency of micro-crack is generated, the present invention proposes a kind of for protective coating of TiAl alloy and preparation method thereof.
The protective coating for TiAl alloy is by being sprayed on the tie coat on TiAl matrix alloys surface and being sprayed on
The ceramic coating composition on the tie coat surface.Wherein, the thickness of tie coat is 90~110 μm, and the thickness of ceramic coating is
280~320 μm.
The ceramic coating by 87wt.% Al2O3And 13wt.%TiO2Mixed-powder spray；The mixing
The grain size of powder is 15~45 μm；Tie coat is sprayed by the alloy powder NiCoCrAlY that grain size is 45~105 μm；
The chemical composition of the tie coat is：The Al of Co, 12wt.% of Cr, 23wt.% of Ni, 18wt.% of 46wt.% and
The Y of 1wt.%.
The detailed process of protective coating described in preparation proposed by the present invention for TiAl alloy is as follows：
Step 1, the preparation of sample；
Step 2：The blasting treatment of sample：
In the blasting treatment for carrying out sample, blasting treatment is carried out to spraying sample using the emergy of 50~70 mesh, is made
Alloy surface roughness reaches 3~5 μm；Drying and processing is carried out to dusty spray under 80 DEG C of environment, dries 2h；
Step 3：The preparation of tie coat：
Make the upper surface that the alloy powder NiCoCrAlY is sprayed to the TiAl alloy using plasma spray system
For tie coat；The thickness of the tie coat is 90~110 μm.Spray voltage is 30~35V, and spraying current is 600~650A.
Spray distance is 100~110mm.The powder feeding rate of plasma spray system is 20~25g/min.Spray gun rate travel is 700mm/
min。
During spraying prepares tie coat, while using Ar and He as working gas, wherein the pressure of Ar for 0.3~
The flow of 0.35MPa, Ar are 30~35L/min；The pressure of He is 0.35~0.4MPa, and the flow of He is 3~5L/min.
Step 4：The preparation of ceramic coating：The surface of tie coat will be sprayed to as the mixed-powder of the ceramics, obtained
To ceramic coating.The thickness of the ceramic coating is 280~320 μm.Spray voltage is 35~45V；Spraying current for 750~
850A；Spray distance is 100~110mm, and the powder feeding rate of plasma spray system is 22.5~27.5g/min.Spray gun movement speed
Rate is 700mm/min.
During spraying prepares ceramic coating, while using Ar and He as working gas, the pressure of Ar for 0.4~
The flow of 0.5MPa, Ar are 40~50L/min；The pressure of He is 0.45~0.5MPa, and the flow of He is 4~6L/min.
So far, it completes and prepares the process of antioxidant coating on the TiAl alloy surface.
The present invention provides a kind of 800 DEG C of high-temperature oxidation resistant coatings for TiAl alloy, and the coating is by plasma spraying method system
, this method is simple for process, easy to operation, efficient.The coating can effectively improve alloy antioxygenic property, keep simultaneously
The mechanical property of TiAl alloy, to meet it as structural material requirement in a high temperauture environment.
The present invention is made of ceramic coating and tie coat.The main function of ceramic coating is enhancing alloy surface antioxygen
Change, corrosion-resistant, abrasion resistance properties.The main function of tie coat is connection matrix and ceramic coating, alleviates internal stress, enhancing knot
Close intensity.
Present invention employs NiCoCrAlY transition zones and Al2O3- 13wt.%TiO2The composite coating knot that ceramic layer is combined
Structure.Al2O3Coating has good anti-oxidant, crocking resistance, can avoid the problem that being aoxidized by transition in spraying process,
But hole is easily generated in Plasma Spraying Process Using causes structure not fine and close, adds in 13wt.%TiO2Can play sealing hole,
Discharge stress, the effect for reducing crackle so that structure is finer and close.And ceramic coating Al2O3- 13wt.%TiO2With the heat of matrix
Coefficient of expansion difference is larger, in cooling procedure has been sprayed, is also easy to produce larger internal stress, coating cracking is caused even to come off.
Increase tie coat between matrix and ceramic coating, the coefficient of thermal expansion of NiCoCrAlY alloyed powders between matrix and ceramic coating it
Between, it in cooling procedure, plays a transition role, slows down internal stress, enhance anchoring strength of coating.In spraying process, tie coat
It is differed with the spray parameters of ceramic coating, ceramic powders different from the fusing point of ceramic powders this is mainly due to alloy powder
With higher fusing point, needing the fusing power of bigger can just make ceramic powders fusing more complete；Powder feeding rate, spray distance etc.
Parameter changes also with the variation of spray power.
In the present invention, Al2O3- 13wt.%TiO2Ceramic coating is to be sprayed on composite coating the top, to improving alloy
Antioxygenic property is of crucial importance.According to Fig. 1, Fig. 2, it is followed successively by ceramic coating, tie coat, base from top to bottom
Body.It can be seen from the figure that there is the particle (atrament) not being completely melt in ceramic coating.This is because Al2O3With compared with
High fusing point, in spraying process, Al is not achieved in non-uniform temperature in spray gun, partial particulate central temperature2O3Fusing point, particle melt
Change incomplete.From Fig. 1, Fig. 2 as can be seen that in addition to most of Al in ceramic coating2O3Outside, it goes back Dispersed precipitate and white strip
Substance understands that this substance is TiO by energy disperse spectroscopy test analysis2。TiO2The relatively low fusing of fusing point is complete, and Dispersed precipitate is applied in ceramics
It can play the role of sealing hole in layer, release stress, reduce crackle so that structure is finer and close.
Due to can inevitably generate some holes and micro-crack in spraying process, in oxidation process, oxygen atom passes through this
Some holes gap and micro-crack are entered in coating.And NiCoCrAlY alloyed powders are complete due to melting, so the more ceramic painting of tie coat
Layer is more fine and close, and tie coat can react generation oxide (in Fig. 3 with penetrating the oxygen atom of ceramic coating
Atrament), further oxygen atom is prevented to permeate, improve alloy antioxygenic property.Fig. 4 is spraying pre-ceramic powder, Fig. 5 is spray
The diffracting spectrum of ceramic coating after painting, it can be seen that after plasma spraying, a large amount of α-Al2O3Inversion of phases is γ-Al2O3
Phase, and TiO2Mutually but without what significant change.By α-Al2O3、γ-Al2O3、TiO2The ceramic coating of mixed oxide composition,
With good antioxygenic property and chemical stability.Fig. 6 is the oxidation weight gain curve that 100h is aoxidized at 800 DEG C, it can be seen that
There is the oxidation weight gain of coating alloy significantly lower than virgin alloy, illustrate that antioxidant coating can effectively resist TiAl alloy
Oxidation protection.
The present invention has invented a kind of high-temperature oxidation resistant coating for TiAl alloy surface, that is, utilizes plasma spraying method
NiCoCrAlY tie coats and Al are prepared in alloy surface2O3- 13wt.%TiO2The composite coating knot that ceramic coating is combined
Structure.Compared with other surface treatment methods, plasma spraying method has simple for process, easy to operate, efficient, coating layer thickness
The features such as easily controllable, but anchoring strength of coating caused by its spraying process is not high, the unsound feature of coating also restricts
It develops.And NiCoCrAlY tie coats and Al2O3- 13wt.%TiO2The composite coating structure that ceramic coating is combined draws
Enter, effectively solve the problems, such as this.External ceramic coating can be obviously improved the antioxygenic property of alloy, add in suitable TiO2
The defects of coating porosity is big, compactness is poor can be improved；And tie coat can not only enhance alloy and the combination of painting interlayer is strong
Degree can also solve due to the not fine and close caused oxygen atom infiltration problem of ceramic coating, to further enhance the antioxygenic property of alloy.
Entire Plasma Spraying Process Using, it is simple for process, easy to operate, of low cost, be conducive to practical engineering application.
Description of the drawings
Fig. 1 is the scanning electron microscope macrograph in the inoxidized section of one plasma spraying coating of embodiment；
Fig. 2 is the scanning electron microscope macrograph in the section after one plasma spraying coating oxidation of embodiment；
Fig. 3 is the scanning electron microscope macrograph of transition layer cross section after one plasma spraying coating oxidation of embodiment；
Fig. 4 is Al before one plasma spraying of embodiment2O3- 13wt.%TiO2The XRD diffracting spectrums of ceramic powders, wherein 1
For α-Al2O3X-ray diffraction peak, 2 be TiO2X-ray diffraction peak, 3 be γ-Al2O3X-ray diffraction peak；
Fig. 5 is Al after one plasma spraying of embodiment2O3- 13wt.%TiO2The XRD diffracting spectrums of ceramic coating, wherein 2
For TiO2X-ray diffraction peak, 1 be α-Al2O3X-ray diffraction peak, 3 be γ-Al2O3X-ray diffraction peak.
After Fig. 6 is one plasma spraying coating of embodiment, coating sample is at 800 DEG C, the oxidation weight gain of oxidation 100 hours
Curve, 4 be virgin alloy oxidation weight gain curve, and 5 is have coating alloy oxidation weight gain curve.
Fig. 7 is the flow chart of the present invention.
Specific embodiment
Embodiment one
The present embodiment is that a kind of 800 DEG C of high-temperature oxidation resistant coatings are prepared in TiAl alloy.The TiAl alloy is Ti-
45Al-8.5Nb-0.2W。
The high-temperature oxidation resistant coating is by being sprayed on the tie coat on TiAl matrix alloys surface and being sprayed on the mistake
Cross the ceramic coating composition of coating surface；The thickness of the tie coat is 90 μm, and the thickness of ceramic coating is 280 μm.
The tie coat is sprayed by alloy powder NiCoCrAlY, and chemical composition is by weight percentage：
46% Ni, 18% Cr, 23% Co, 12% Al, 1% Y.Powder diameter is：45~105 μm.
The ceramic coating by 87wt.% Al2O3And 13wt.%TiO2Mixed-powder spray, powder diameter
It is 15~45 μm.
The preparation process of TiAl alloy antioxidant coating that this embodiment is proposed is as follows：
Step 1, the preparation of sample：The lath-shaped that TiAl alloy is cut into 20 × 10 × 3mm using spark cutting tries
Sample with acetone, ethyl alcohol is cleaned by ultrasonic 5 minutes and removes degreasing successively.
Step 2：The blasting treatment of sample：Blasting treatment is carried out to spraying sample using the emergy of 50~70 mesh, makes conjunction
Golden watch surface roughness reaches 3~5 μm, and the remaining grains of sand in coating surface position are blown away using compressed air after roughening；In 80 DEG C of rings
Drying and processing is carried out to dusty spray under border, dries 2h；
Step 3：The preparation of tie coat：The alloy powder NiCoCrAlY is sprayed using plasma spray system
To the upper surface of the TiAl alloy as tie coat；The thickness of the tie coat is 90 μm.In spraying process, at the same with Ar and
He is working gas, and wherein the pressure of Ar is 0.3MPa, and the flow of Ar is 30L/min；The pressure of He be 0.35MPa, the stream of He
It measures as 3L/min.Spray voltage is 30V, spraying current 600A.Spray distance is 100mm.The powder feeding of plasma spray system
Rate is 20g/min.Spray gun rate travel is 700mm/min.
Step 4：The preparation of ceramic coating.The surface of tie coat will be sprayed to as the mixed-powder of the ceramics, obtained
To ceramic coating.The thickness of the ceramic coating is 280 μm.In spraying, while using Ar and He as working gas, the pressure of Ar is
The flow of 0.4MPa, Ar are 40L/min, and the pressure of He is 0.45MPa, and the flow of He is 5L/min.Spray voltage is 35V；Spray
Painting electric current is 750A；Spray distance is 100mm, and the powder feeding rate of plasma spray system is 22.5g/min.Spray gun rate travel is
700mm/min。
So far, it completes and prepares the process of antioxidant coating on the TiAl alloy surface.
In order to examine coating antioxygenic property, coating sample is subjected to constant temperature oxidation experiment.Oxidation experiment is in box resistance
It is carried out in stove, test medium is still air, and temperature is 800 DEG C, total duration 100h.It is taken out every 20h together with crucible
It weighs, it is 1 × 10 to weigh with electronics accuracy of balance-4G is put into stove after weighing and continues to aoxidize.The results show that NiCoCrAlY mistakes
Cross coating and Al2O3- 13wt.%TiO2The composite coating structure that ceramic coating is combined can be obviously improved alloy property, original
The oxidation weight gain of TiAl alloy unit area is 0.91mg/cm-2, the oxidation weight gain of coating unit area is 0.53mg/cm-2, compared with
Virgin alloy reduces about 42%, and high temperature oxidation resistance is obviously improved.
Embodiment two
The present embodiment is that a kind of 800 DEG C of high-temperature oxidation resistant coatings are prepared in TiAl alloy.The TiAl alloy is Ti-
45Al-8.5Nb-0.2W。
The high-temperature oxidation resistant coating is by being sprayed on the tie coat on TiAl matrix alloys surface and being sprayed on the mistake
Cross the ceramic coating composition of coating surface；The thickness of the tie coat is 100 μm, and the thickness of ceramic coating is 300 μm.
The tie coat is sprayed by alloy powder NiCoCrAlY, and chemical composition is by weight percentage：
46% Ni, 18% Cr, 23% Co, 12% Al, 1% Y.Powder diameter is：45~105 μm.
The ceramic coating by 87wt.% Al2O3And 13wt.%TiO2Mixed-powder spray, powder diameter
It is 15-45 μm.
The preparation process of TiAl alloy antioxidant coating that this embodiment is proposed is as follows：
Step 1：The preparation of sample：The lath-shaped that TiAl alloy is cut into 20 × 10 × 3mm using spark cutting tries
Sample with acetone, ethyl alcohol is cleaned by ultrasonic 5 minutes and removes degreasing successively.
Step 2：The blasting treatment of sample：Blasting treatment is carried out to spraying sample using the emergy of 50~70 mesh, makes conjunction
Golden watch surface roughness reaches 3~5 μm, and the remaining grains of sand in coating surface position are blown away using compressed air after roughening；In 80 DEG C of rings
Drying and processing is carried out to dusty spray under border, dries 2h；
Step 3：The preparation of tie coat：Alloy powder NiCoCrAlY sprayed to using plasma spray system described
The upper surface of TiAl alloy is as tie coat；The thickness of the tie coat is 100 μm.In spraying process, while with Ar and He
For working gas, the wherein pressure of Ar is 0.33MPa, and the flow of Ar is 32L/min；The pressure of He be 0.38MPa, the flow of He
For 4L/min.Spray voltage is 35V, spraying current 625A.Spray distance is 105mm.The powder feeding rate of plasma spray system
For 22.5g/min.Spray gun rate travel is 700mm/min.
Step 4：The preparation of ceramic coating：The surface of tie coat will be sprayed to as the mixed-powder of the ceramics, obtained
To ceramic coating.The thickness of the ceramic coating is 300 μm.In spraying, while using Ar and He as working gas, the pressure of Ar is
The flow of 0.45MPa, Ar are 45L/min, and the pressure of He is 0.48MPa, and the flow of He is 4L/min.Spray voltage is 40V；Spray
Painting electric current is 800A；Spray distance is 105mm, and the powder feeding rate of plasma spray system is 25g/min.Spray gun rate travel is
700mm/min。
So far, it completes and prepares the process of antioxidant coating on the TiAl alloy surface.
In order to examine coating antioxygenic property, coating sample is subjected to constant temperature oxidation experiment.Oxidation experiment is in box resistance
It is carried out in stove, test medium is still air, and temperature is 800 DEG C, total duration 100h.It is taken out every 20h together with crucible
It weighs, it is 1 × 10 to weigh with electronics accuracy of balance-4G is put into stove after weighing and continues to aoxidize.The results show that NiCoCrAlY mistakes
Cross coating and Al2O3- 13wt.%TiO2The composite coating structure that ceramic coating is combined can be obviously improved alloy property, original
The oxidation weight gain of TiAl alloy unit area is 0.89mg/cm-2, the oxidation weight gain of coating unit area is 0.45mg/cm-2, compared with
Virgin alloy reduces about 49%, and high temperature oxidation resistance is obviously improved.
Embodiment three
The present embodiment is that a kind of 800 DEG C of high-temperature oxidation resistant coatings are prepared in TiAl alloy.The TiAl alloy is Ti-
45Al-8.5Nb-0.2W。
The high-temperature oxidation resistant coating is by being sprayed on the tie coat on TiAl matrix alloys surface and being sprayed on the mistake
Cross the ceramic coating composition of coating surface；The thickness of the tie coat is 100 μm, and the thickness of ceramic coating is 300 μm.
The tie coat is formed by alloyed powder NiCoCrAlY powder sprays, and chemical composition is by weight percentage：
46% Ni, 18% Cr, 23% Co, 12% Al and 1% Y.Powder diameter is：45~105 μm.
The ceramic coating by 87wt.% Al2O3And 13wt.%TiO2Mixed-powder spray, powder diameter
It is 15-45 μm.
The preparation process of TiAl alloy antioxidant coating that this embodiment is proposed is as follows：
Step 1, the preparation of sample：The lath-shaped that TiAl alloy is cut into 20 × 10 × 3mm using spark cutting tries
Sample with acetone, ethyl alcohol is cleaned by ultrasonic 5 minutes and removes degreasing successively.
Step 2, pre-treatment is sprayed：Blasting treatment is carried out to spraying sample using the emergy of 50~70 mesh, makes alloy table
Surface roughness reaches 3~5 μm, and the remaining grains of sand in coating surface position are blown out using compressed air after roughening；Under 80 DEG C of environment
Drying and processing is carried out to dusty spray, dries 2h.
Step 3, the preparation of tie coat：Alloy powder NiCoCrAlY sprayed to using plasma spray system described
The upper surface of TiAl alloy is as tie coat；The thickness of the tie coat is 110 μm.In spraying process, while with Ar and He
For working gas, the wherein pressure of Ar is 0.35MPa, and the flow of Ar is 35L/min；The pressure of He be 0.4MPa, the flow of He
For 5L/min.Spray voltage is 33V, spraying current 650A.Spray distance is 100mm.The powder feeding rate of plasma spray system
For 25g/min.Spray gun rate travel is 700mm/min.
Step 4, the preparation of ceramic coating：The surface of tie coat will be sprayed to as the mixed-powder of the ceramics, obtained
To ceramic coating.The thickness of the ceramic coating is 320 μm.In spraying, while using Ar and He as working gas, the pressure of Ar is
The flow of 0.5MPa, Ar are 50L/min, and the pressure of He is 0.5MPa, and the flow of He is 9L/min.Spray voltage is 45V；Spraying
Electric current is 850A；Spray distance is 110mm, and the powder feeding rate of plasma spray system is 27.5g/min.Spray gun rate travel is
700mm/min。
So far, it completes and prepares the process of antioxidant coating on the TiAl alloy surface.
In order to examine coating antioxygenic property, coating sample is subjected to constant temperature oxidation experiment.Oxidation experiment is in box resistance
It is carried out in stove, test medium is still air, and temperature is 800 DEG C, total duration 100h.It is taken out every 20h together with crucible
It weighs, it is 1 × 10 to weigh with electronics accuracy of balance-4G is put into stove after weighing and continues to aoxidize.The results show that NiCoCrAlY mistakes
Cross layer and Al2O3- 13wt.%TiO2The composite coating structure that ceramic layer is combined can be obviously improved alloy property, original TiAl
The oxidation weight gain of alloy unit area is 0.88mg/cm-2, the oxidation weight gain of coating unit area is 0.41mg/cm-2, it is more original
Alloy reduces about 53%, and high temperature oxidation resistance is obviously improved.
Claims (6)
1. a kind of protective coating for TiAl alloy, which is characterized in that applied by the transition for being sprayed on TiAl matrix alloys surface
Layer and the ceramic coating composition for being sprayed on the tie coat surface.Wherein, the thickness of tie coat is 90~110 μm, and ceramics apply
The thickness of layer is 280~320 μm.
2. as described in claim 1 be used for TiAl alloy protective coating, which is characterized in that the ceramic coating by
The Al of 87wt.%2O3And 13wt.%TiO2Mixed-powder spray；The grain size of the mixed-powder is 15~45 μm；It crosses
Crossing coating is sprayed by the alloy powder NiCoCrAlY that grain size is 45~105 μm；The chemical composition of the tie coat is：
The Y of the Al and 1wt.% of Co, 12wt.% of Cr, 23wt.% of Ni, 18wt.% of 46wt.%.
3. a kind of prepare described in claim 1 for the method for the protective coating of TiAl alloy, which is characterized in that detailed process is such as
Under：
Step 1, the preparation of sample；
Step 2：The blasting treatment of sample；
Step 3：The preparation of tie coat：
By the use of plasma spray system using the alloy powder NiCoCrAlY spray to the upper surface of the TiAl alloy as
Cross coating；The thickness of the tie coat is 90~110 μm.Spray voltage is 30~35V, and spraying current is 600~650A.Spraying
Distance is 100~110mm.The powder feeding rate of plasma spray system is 20~25g/min.Spray gun rate travel is 700mm/min.
Step 4：The preparation of ceramic coating：
The surface of tie coat will be sprayed to as the mixed-powder of the ceramics, obtain ceramic coating.The thickness of the ceramic coating
Spend is 280~320 μm.Spray voltage is 35~45V；Spraying current is 750~850A；Spray distance is 100~110mm, etc.
The powder feeding rate of plasma spray system is 22.5~27.5g/min.Spray gun rate travel is 700mm/min.
So far, it completes and prepares the process of antioxidant coating on the TiAl alloy surface.
4. as claimed in claim 3 for the preparation method of the protective coating of TiAl alloy, which is characterized in that carrying out sample
During blasting treatment, blasting treatment is carried out to spraying sample using the emergy of 50~70 mesh, make alloy surface roughness reach 3~
5μm；Drying and processing is carried out to dusty spray under 80 DEG C of environment, dries 2h.
5. as claimed in claim 3 for the preparation method of the protective coating of TiAl alloy, which is characterized in that spraying prepares transition
During coating, while using Ar and He as working gas, the wherein pressure of Ar is 0.3~0.35MPa, the flow of Ar for 30~
35L/min；The pressure of He is 0.35~0.4MPa, and the flow of He is 3~5L/min.
6. as claimed in claim 3 for the preparation method of the protective coating of TiAl alloy, which is characterized in that spraying prepares ceramics
During coating, while using Ar and He as working gas, the pressure of Ar is 0.4~0.5MPa, and the flow of Ar is 40~50L/
min；The pressure of He is 0.45~0.5MPa, and the flow of He is 4~6L/min.
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| CN108914043A (en) * | 2018-07-17 | 2018-11-30 | 西安交通大学 | A kind of preparation method of high-temperature wearable damage antioxidant coating |
| CN108914045A (en) * | 2018-09-25 | 2018-11-30 | 德清创智科技股份有限公司 | Vacuum brazing stainless steel chucking surface coating and preparation method thereof |
| CN110965005A (en) * | 2019-11-22 | 2020-04-07 | 江阴市东泰管件有限公司 | High-temperature corrosion resistant coating on surface of heating furnace radiation area collecting pipe and preparation method thereof |
| CN112144005A (en) * | 2020-08-20 | 2020-12-29 | 西安交通大学 | Blade tip cutting coating with interface barrier layer and preparation method thereof |
| CN114150313A (en) * | 2021-11-23 | 2022-03-08 | 西安文理学院 | TiAl alloy high-temperature oxidation-resistant nano thermal barrier coating and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108914043A (en) * | 2018-07-17 | 2018-11-30 | 西安交通大学 | A kind of preparation method of high-temperature wearable damage antioxidant coating |
| CN108914045A (en) * | 2018-09-25 | 2018-11-30 | 德清创智科技股份有限公司 | Vacuum brazing stainless steel chucking surface coating and preparation method thereof |
| CN110965005A (en) * | 2019-11-22 | 2020-04-07 | 江阴市东泰管件有限公司 | High-temperature corrosion resistant coating on surface of heating furnace radiation area collecting pipe and preparation method thereof |
| CN112144005A (en) * | 2020-08-20 | 2020-12-29 | 西安交通大学 | Blade tip cutting coating with interface barrier layer and preparation method thereof |
| CN112144005B (en) * | 2020-08-20 | 2021-12-28 | 西安交通大学 | Blade tip cutting coating with interface barrier layer and preparation method thereof |
| CN114150313A (en) * | 2021-11-23 | 2022-03-08 | 西安文理学院 | TiAl alloy high-temperature oxidation-resistant nano thermal barrier coating and preparation method thereof |
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