CN104498861B - Preparation method of sealing coating with high peeling failure resistance - Google Patents
Preparation method of sealing coating with high peeling failure resistance Download PDFInfo
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- CN104498861B CN104498861B CN201410785439.XA CN201410785439A CN104498861B CN 104498861 B CN104498861 B CN 104498861B CN 201410785439 A CN201410785439 A CN 201410785439A CN 104498861 B CN104498861 B CN 104498861B
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Abstract
The invention provides a preparation method of a sealing coating with high peeling failure resistance. The preparation method comprises the following steps: carrying out structure shaping on the surface of a matrix by means of electron beam texturing or laser beam texturing, wherein the height of the structure shape is not less than 1/4 of the thickness of the coating; carrying out the thermal spraying deposition of a sealing coating material on the surface with the structure shape, of the matrix to obtain the sealing coating with high peeling failure resistance; the thermal spraying comprises the following steps: spraying by means of inclined rotary spraying, and carrying out coating deposition by means of vertical spraying after the deposition thickness of the coating achieves the height of the shape, that is, excesses the top of the shape. The preparation method provided by the invention is capable of increasing the contact area between the coating and the matrix, changing a laminated superposition structure, releasing the stress of the coating, and improving the peeling-resistant capacity of the sealing coating, thus the ingredients of the coating cannot be decomposed while the service life of the coating is prolonged.
Description
Technical field
The present invention relates to a kind of preparation method of seal coating, the seal coating losing efficacy particularly to a kind of high anti-strip
Preparation method, belongs to coat preparing technology field.
Background technology
Aero-turbine outer shroud tip clearance often increases by 1% with the ratio of length of blade, and turbine efficiency loses therewith
Increase 1-3%, thermal spraying gas circuit seal coating is to improve engine efficiency and performance, reduce one of important channel of oil consumption, is
One of crucial manufacturing technology of aero-engine.
The operating temperature of high-pressure turbine outer shroud seal coating, more than 1000 DEG C, still suffers from supersonic speed combustion gas simultaneously and washes away
And the tip scraping of the turbo blade of high-speed rotation, it is excellent that above condition of work requires high pressure turbine outer ring seal coating to have
Thermal shock resistance and antioxygenic property, enough bond strengths, excellent abradable performance and anti-airflow scouring performance, its performance
Quality directly affect power, thrust, efficiency and the reliability of engine.
The high temperature seal coating using at present, due to hot-spraying coating inherently, coating is tied with basal body interface
Be combined into mechanical bond, bond strength is relatively low, determine coating work in high temperature environments easily because adhesion is weak, stress concentration etc.
Defect and crack and flake off, lead to reliability reduce, service life shorten, have a strong impact on engine reliability and aircraft peace
Entirely.Therefore, at present in the urgent need to a kind of preparation method of new coating, anti-strip, long-life protection of obturaging can be prepared
Coating.Therefore how to improve the adhesion of coating, finally strengthen its anti-strip ability, ask thus extending coating service life and becoming
The key of topic.
In the research in past, in order to lift the anti-strip inefficacy ability of coating, heat treatment after coating is sprayed is
A kind of effective processing method, can lift the adhesion of coating, thus improving coating anti-strip ability, extending coating and being on active service the longevity
Life.But, in heat treatment process, coating composition will occur because of being heated partially or completely to decompose, and reduces coating
Performance.
In sum, provide a kind of anti-strip inefficacy ability of lifting coating and the preparation method of coating performance will not be reduced
Become this area problem demanding prompt solution.
Content of the invention
In order to solve the above problems, it is an object of the invention to provide a kind of easily send out for traditional thermal spraying seal coating
The preparation method of the seal coating of high anti-strip inefficacy of block and spalling failure problem is fallen in life.
In order to achieve the above object, the invention provides a kind of preparation method of seal coating that lost efficacy of high anti-strip,
In this preparation method before coating spraying deposition, using electron beam roughing method or laser texturing method, matrix surface is tied
Structure type is processed, and the specific modelling required for realizing, afterwards on the matrix with modeling structure, using Sloped rotating spraying process
The mode combining with vertical spraying process carries out spray deposited to target coating.This preparation method specifically includes following steps：
Mechanical Builds are carried out to matrix surface by electron beam roughing method or laser beam roughing method；Wherein, described knot
The height of structure type is not less than the 1/4 of coating layer thickness；
The thermal spray deposition of sealing coating material is carried out on the matrix surface with Mechanical Builds, obtains high anti-strip and lose
The seal coating of effect；
Wherein, described thermal spray deposition comprises the following steps：
First sprayed using Sloped rotating spraying method, deposit thickness to be coated reaches build height, that is, do not had moulding
Behind top, then coating deposition is carried out using vertical spraying method.
According to the specific embodiment of the present invention, the spraying method that the present invention adopts is plasma spray coating process.
According to the specific embodiment of the present invention, electron beam texturing is carried out under vacuum, and laser roughening is antivacuum
Under the conditions of carry out；
It is preferable that entering to matrix surface in the preparation method of the seal coating that the high anti-strip that the present invention provides lost efficacy
The frequency of row Mechanical Builds is 750-4500Hz.
It is preferable that entering to matrix surface in the preparation method of the seal coating that the high anti-strip that the present invention provides lost efficacy
The time of row Mechanical Builds is 15-60s.
It is preferable that entering to matrix surface in the preparation method of the seal coating that the high anti-strip that the present invention provides lost efficacy
The electric current of row Mechanical Builds is 2-10mA.
It is preferable that entering to matrix surface in the preparation method of the seal coating that the high anti-strip that the present invention provides lost efficacy
The voltage of row Mechanical Builds is 90-150kV.
It is preferable that Sloped rotating sprays in the preparation method of the seal coating that the high anti-strip that the present invention provides lost efficacy
In mode, the angle between spray gun and matrix is more than 45 ° and to be less than 90 °, and concrete angle those skilled in the art can be according to tool
Body situation determines.
It is preferable that sealing coating material in the preparation method of the seal coating that the high anti-strip that the present invention provides lost efficacy
Heat 1h-4h using front at 100 DEG C -200 DEG C；Sealing coating material from sealing coating material commonly used in the art is
Can.
It is preferable that the electric current of thermal spraying in the preparation method of the seal coating that the high anti-strip that the present invention provides lost efficacy
For 450-550A；Voltage is 60-75V.
It is preferable that the powder feeding of thermal spraying in the preparation method of the seal coating that the high anti-strip that the present invention provides lost efficacy
Speed is 40-80g/min.
It is preferable that carrier gas in thermal spraying in the preparation method of the seal coating that the high anti-strip that the present invention provides lost efficacy
Flow velocity be 4-7L/min.
According to the specific embodiment of the present invention, the main gas of thermal spraying is 35-45L/min, and the auxiliary gas of thermal spraying is
5.0-7.0L/min.
The preparation method of the seal coating that the high anti-strip that the present invention provides lost efficacy, specifically includes following steps：
First, with absolute ethyl alcohol or acetone, matrix is carried out, removes greasy dirt, rusty stain or dust of matrix surface etc. miscellaneous
Matter；
Then, Mechanical Builds are carried out to the matrix surface cleaning up by electron beam texturing or laser beam texturing technique,
Modeling structure yardstick generates software by waveform after determining and controls generating structure moulding；
According to different sprayed on material and matrix, the Service Environment condition of integration objective coating, design specific texturing and make
Type structure, size, density and distribution pattern, because different molding surfaces, size and Density Distribution etc. all can be to follow-up mesh
The deposition of mark coating sprawls, between coating structure compactness, coating and matrix and interfacial bonding strength etc. plays decisive role,
Modeling structure parameter determines according to following condition：
First, the physical dimension of surface texturing moulding is according to the raw material composition of sealing coating material, coating layer thickness, coating
The factors such as Service Environment determine.In spray deposition process, according to different sealing coating materials, matrix and different surfaces moulding
Structure, selects different deposition process parameters and angle；
Second, determine, recessed features improve the mechanical interlocked of same connection member, and dash forward according to protruding with recessed size
Go out the Stress Release that feature contributes to joint interface, and protrude main with recessed size and matrix material, target coating material
Material and final thickness are related；
Finally, the thermal spray deposition of sealing coating material is carried out on the matrix surface with Mechanical Builds, obtains high anti-
The seal coating of spalling failure；
In coating deposition process, first have to take Sloped rotating spraying method, that is, between spray gun and matrix at an angle, base
Body is fixed by frock and is arranged specific rotating speed and carries out rotary spraying.Because after matrix surface processes modeling structure, if still
By traditional vertical mode spraying, because of the stop of modeling structure, spraying shielding effect can occur, and produce more great hole,
Cause coating texture uneven, stability is poor；Deposit thickness to be coated reaches build height, that is, do not had moulding top
Afterwards, coating deposition is carried out using vertical spraying process.
In the preparation method of the seal coating that the high anti-strip that the present invention provides lost efficacy, by tying to matrix surface
Structure type increased the contact area and interlocking power between coating and matrix, changes stratiform overlaying structure, such that it is able to change painting
Crack growth mechanism in layer surface, guiding and release coating stress, enhance coating shear strength.Coating can be effectively stoped to exist
Be there is spalling failure by the presence of shearing friction power, lift coating performance, extend coating service life.
The preparation method of the seal coating that the high anti-strip that the present invention provides lost efficacy, first pass through electron beam texturing technique or
Laser roughening technique carries out Mechanical Builds in matrix surface, utilizes hot-spraying technique to deposit seal coating in molding surface afterwards,
To improve the contact area between coating and matrix, to change the anti-stripping of stratiform overlaying structure, release coating stress, lifting seal coating
Fall ability, makes that coating service life obtains very big prolongation and composition will not produce decomposition.
Brief description
Fig. 1 is the structural representation that matrix is carried out with texturing moulding in embodiment 1；
Fig. 2 is the coating in embodiment 1 and the shape appearance figure between matrix texturing interface.
Specific embodiment
In order to be more clearly understood to the technical characteristic of the present invention, purpose and beneficial effect, the now skill to the present invention
Art scheme carry out described further below, but it is not intended that to the present invention can practical range restriction.
Embodiment 1
Present embodiments provide a kind of preparation method of the seal coating that high anti-strip lost efficacy, this preparation method includes following
Step：
Using absolute ethyl alcohol or acetone, matrix to be sprayed is carried out, dries；
Sealing coating material powder is put into and in heating furnace, is heated to 100 DEG C of insulations 1 hour, wherein, the painting of obturaging of employing
The raw material composition of layer material includes：Co24Ni16Cr6Al0.3Y7BN14Polyester, particle diameter is 176 ± 7.8 μm；
The matrix cleaning up is placed in the vacuum tank of texturing equipment, sets texturing parameter, open electron beam texturing
Equipment, vacuumizes, and carries out matrix surface Mechanical Builds processing, and its structural representation is as shown in figure 1, program to be processed operation finishes
Afterwards, close electron beam texturing equipment, open vacuum tank, take out the good matrix of texturing；Wherein, concrete texturing parameter is (according to matrix
Design parameter when texturing thorn reaches required yardstick in processing is determined)：Waveform is Com-ajmd, frequency is 1500Hz, bundle
Flow for electronic beam current, the time be 60S, electric current be 2mA-10mA, voltage be 90kV；
Shape after texturing generates software by waveform and carries out after Waveform Design by Software Create；
Coating material powder is put in spraying powder feeder, opens cooling water, cooling air etc., open powder feeder, open
Spraying equipment, carries out the deposition of target coating in the matrix surface with modeling structure：First pass through Sloped rotating plasma spray
Coating method (between spray gun and matrix be in 70 °) is sprayed, to be coated covered whole modeling structure after, then adopt vertical plasma
Spraying process carries out coating deposition, to be painted be applied to target thickness after, close powder feeder, close spraying equipment, close cooling water, cooling
Air, wherein, the parameter of plasma spraying is electric current 500A, voltage 70V, main gas 40L/min, auxiliary gas 6.0L/min, powder feeding
Speed 40g/min, flow rate of carrier gas 5L/min, obtain the seal coating that high anti-strip lost efficacy, between coating and matrix texturing interface
Pattern is as shown in Figure 2.
The seal coating that high anti-strip manufactured in the present embodiment was lost efficacy has carried out correlated performance test, test result such as table
Shown in 1.
Table 1
As shown in Table 1, the preparation method of the seal coating that the high anti-strip that the present invention provides lost efficacy can ensure to prepare
Coating there is good wearability, coating porosity and microhardness all one preferably in the range of and controlled, by it
Cooperation the abradability of coating is adjusted.And matrix surface modeling structure changes coating stratiform overlaying structure, separately
The outer anchoring coupling mechanism force for coating so as to 1100 DEG C of thermal shock resistances bring up to 500 circulations above (traditional in 150-
Between 200 cycles), effectively improve the anti-strip ability of coating, extend service life.
Claims (9)
1. the preparation method of the seal coating that a kind of high anti-strip lost efficacy, this preparation method comprises the following steps：
Mechanical Builds are carried out to matrix surface by electron beam roughing method or laser beam roughing method；Wherein, described structure is made
The height of type is not less than the 1/4 of coating layer thickness；
The thermal spray deposition of sealing coating material is carried out on the matrix surface with Mechanical Builds, obtains what high anti-strip lost efficacy
Seal coating；
Wherein, described thermal spray deposition comprises the following steps：
First sprayed using Sloped rotating spraying method, deposit thickness to be coated reaches build height, then sprayed using vertical
Mode carries out coating deposition, and in described Sloped rotating spraying method, the angle between spray gun and matrix is more than 45 ° and is less than 90 °.
2. preparation method according to claim 1, wherein, the described frequency that matrix surface is carried out with Mechanical Builds is 750-
4500Hz.
3. preparation method according to claim 1, wherein, the described time that matrix surface is carried out with Mechanical Builds is 15-
60s.
4. preparation method according to claim 1, wherein, the described electric current that matrix surface is carried out with Mechanical Builds is 2-
10mA.
5. preparation method according to claim 1, wherein, the described voltage that matrix surface is carried out with Mechanical Builds is 90-
150kV.
6. preparation method according to claim 1, wherein, described sealing coating material is using front at 100 DEG C -200 DEG C
Heating 1h-4h.
7. preparation method according to claim 1, wherein, the electric current of described thermal spraying is 450-550A；Voltage is 60-
75V.
8. preparation method according to claim 1, wherein, the powder feed rate of described thermal spraying is 40-80g/min.
9. preparation method according to claim 1, wherein, in described thermal spraying, the flow velocity of carrier gas is 4-7L/min.
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| CN201410785439.XA CN104498861B (en) | 2014-12-17 | 2014-12-17 | Preparation method of sealing coating with high peeling failure resistance |
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| CN201410785439.XA CN104498861B (en) | 2014-12-17 | 2014-12-17 | Preparation method of sealing coating with high peeling failure resistance |
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| CN104498861A CN104498861A (en) | 2015-04-08 |
| CN104498861B true CN104498861B (en) | 2017-02-22 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106676449A (en) * | 2015-11-04 | 2017-05-17 | 中国人民解放军装甲兵工程学院 | Method for improving bonding strength of coating |
| CN105385976B (en) * | 2015-11-30 | 2017-12-12 | 中国人民解放军装甲兵工程学院 | A kind of preparation method of machine components seal coating |
| CN110592517A (en) * | 2019-10-24 | 2019-12-20 | 中国科学院工程热物理研究所 | Manufacturing method of high-temperature sealing coating structure |
| CN114774826B (en) * | 2022-04-20 | 2023-03-21 | 西安热工研究院有限公司 | Environment barrier coating for preventing and treating overtemperature of boiler and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103572191A (en) * | 2013-11-05 | 2014-02-12 | 中国航空工业集团公司北京航空材料研究院 | Four-phase ceramic matrix high-temperature wearable sealing coating |
| CN103774080A (en) * | 2014-02-21 | 2014-05-07 | 北京矿冶研究总院 | Aluminum-silicon-boron nitride sealing composite powder material, coating and preparation method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103572191A (en) * | 2013-11-05 | 2014-02-12 | 中国航空工业集团公司北京航空材料研究院 | Four-phase ceramic matrix high-temperature wearable sealing coating |
| CN103774080A (en) * | 2014-02-21 | 2014-05-07 | 北京矿冶研究总院 | Aluminum-silicon-boron nitride sealing composite powder material, coating and preparation method |
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Address after: 100024 North East military villa, eight Li bridge, Chaoyang District, Beijing Patentee after: China Institute of Aeronautical Manufacturing Technology Address before: 100024 North East military villa, eight Li bridge, Chaoyang District, Beijing Patentee before: Beijing Aviation Manufacturing Engineering Institute of China Aviation Industry Group Company |
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