CN107326318A - A kind of laser remolten thermal barrier coating preparation technology for suppressing single crystal substrate recrystallization - Google Patents
A kind of laser remolten thermal barrier coating preparation technology for suppressing single crystal substrate recrystallization Download PDFInfo
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- CN107326318A CN107326318A CN201710509497.3A CN201710509497A CN107326318A CN 107326318 A CN107326318 A CN 107326318A CN 201710509497 A CN201710509497 A CN 201710509497A CN 107326318 A CN107326318 A CN 107326318A
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- Prior art keywords
- laser
- single crystal
- barrier coating
- thermal barrier
- remolten
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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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- 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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- Engineering & Computer Science (AREA)
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- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Laser Beam Processing (AREA)
Abstract
A kind of laser remolten thermal barrier coating preparation technology for suppressing single crystal substrate recrystallization, when carrying out laser remolten on band thermal barrier coating nickel-base high-temperature single crystal alloy matrix with laser, the less laser energy value of threshold needed for remelting coating can be reduced using high-frequency induction heating, and the heat that laser conducts into matrix can be significantly reduced, therefore during auxiliary laser remelting thermal barrier coating is preheated, preheating temperature is improved in certain limit can significantly decrease temperature and heat history at matrix/tack coat, and this is beneficial to the change for being avoided monocrystal nickel-base high-temperature alloy matrix recurring structure performance.
Description
Technical field
The invention belongs to technical field of laser processing, and in particular to a kind of laser remolten heat of suppression single crystal substrate recrystallization
Barrier coating preparation technology.
Background technology
It is that coating is peeled off too early that current China thermal barrier coating, which prepares the greatest problem faced, and numerous studies show, coating stripping
Three main causes fallen：(TGO, main component is Al to ceramic layer with tie-layer interface thermal growth oxide2O3) formation and life
It is long；Interface bond strength is not enough；The thermal coefficient of expansion of ceramic layer and matrix is mismatched.This aspect and the attribute phase of coating material
Close, on the other hand also have close relationship with coating structure and preparation method thereof.
Single crystal super alloy is due to eliminating crystal boundary, and its mechanical property is significantly improved, and is prepared using directional solidification technique
Single crystal alloy, temperature in use is already close to the 90% of single crystal alloy fusing point, as contemporary advanced aero engine and combustion gas wheel
The main material of machine blade.But the casting solidification of single crystal blade in the fabrication process shrinks, surface blast and grinding process etc.
Cause blade surface to be plastically deformed, cause blade to produce residual stress, occur Surface Recrystallization in subsequent heat treatment.
Due to boundary-strengthening element is free of or contained less in single crystal alloy, recrystallization is easy to sprout crackle and causes alloy fracture to lose
Effect.
Laser remolten is as one kind of thermal barrier coating modification technology, and it is quickly moved using high energy thermal source, melts material
Quick solidification produces uniform, fine and close microstructure after change, and surface smoothness is high.By the thermal barrier coating of laser remolten, go out
Epitaxial growth at existing closelypacked columnar crystal structure, column crystal orientation, perpendicular to matrix surface, this is for reducing by matrix and pottery
Thermal stress caused by enamel coating thermal coefficient of expansion mismatch is quite effective, and ceramics can form metallurgical binding with metal interface, improves
Bond strength, numerous researchs show：Laser Cladding can be obviously improved the performance of plasma spraying coating, coating life
2-6 times can be improved.
But be hot-working in laser remolten, its thermal source is easy to have influence on matrix.Therefore, single crystal alloy is the heat of matrix
During barrier coating, it should try one's best and avoid its fire damage, prevent single crystal alloy matrix from occurring the generation of recrystallization phenomenon.
The content of the invention
In order to overcome the shortcoming of above-mentioned prior art, single crystal substrate is avoided to recrystallize it is an object of the invention to provide one kind
Laser remolten thermal barrier coating preparation technology, while excellent remelting coating can be prepared, be effectively prevented from single crystal substrate because
Laser heat source and the defect such as recrystallization, fire damage for occurring occurs.
In order to achieve the above object, the technical solution adopted by the present invention is：
A kind of laser remolten thermal barrier coating preparation technology for suppressing single crystal substrate recrystallization, comprises the steps：
1) workpiece 1 of the single crystal super alloy with thermal barrier coating is fixed on heat conducting sleeve 5, heat conducting sleeve 5 is placed on the line of induction
In circle 4, and it is placed on together in heat shield 6, heat shield 6 is fixed on 5-axis movement workbench 11 by fixture 8,5-axis movement
Workbench 11 is connected by kinetic control system 16 and computer 13, and high-frequency inductor 7 heats heat conducting sleeve 5 through radio-frequency induction coil 4,
Heat conducting sleeve 5 transfers heat to workpiece 1, and computer 13 controls the setting for realizing laser remolten parameter of laser 14, laser 14
In the laser launched focused on through lens 10 after be radiated on ceramic layer 3, computer 13 passes through temperature monitor 15 and infrared temperature
Measuring instrument 12 is connected；
2) on the premise of the whole remelting ceramic coatings 3 of laser energy are ensured, the power output of laser, regulation are reduced as far as possible
Laser remolten parameter：Regulation laser single-pulse energy is 6J~7J, and laser pulse width is 0.5ms~1ms, and repetition rate is
40HZ~50HZ, laser spot diameter is 3mm~4mm；
3) laser remolten route is programmed in kinetic control system 16 according to the size of workpiece 1, sets laser scanning speed
For 5~10mm/s, scan mode is multi-track overlapping method；
4) operating power of regulation high-frequency inductor 7 is 20KW~25KW；
5) after the temperature of infrared thermography instrument 12 reaches 0 DEG C~800 DEG C and stabilization, laser 14, open movement are opened
Control system 16 makes 5-axis movement workbench 11 by the programming line-of-road movement of setting, carries out laser remolten.
Advantages of the present invention：The workpiece mode of high-frequency induction heating monocrystal nickel-base high-temperature alloy is employed, is characterized in rising
Warm speed is fast, and can carry out local preheating to predetermined region, reduces the thermal stress in reflow process, it is to avoid the remelting of laser depth is made pottery
A large amount of crackles during enamel coating are produced；Remelting coating is effectively reduced to the pre- heat energy of workpiece progress sensing of monocrystal nickel-base high-temperature alloy
Required less laser energy value of threshold, and the heat that laser conducts into workpiece can be significantly reduced, therefore in preheating auxiliary laser weight
During molten thermal barrier coating, raising preheating temperature can significantly decrease temperature and heat at matrix/tack coat and tire out in certain limit
Product, this is beneficial to be avoided the change of the workpiece recurring structure performance of monocrystal nickel-base high-temperature alloy.
Brief description of the drawings
Fig. 1 is the structural representation of device therefor of the present invention.
Fig. 2 is to recrystallize situation using the inventive method remelting thermal barrier coating interface single crystal substrate.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.
Laser remelting is modified thermal barrier coating 3 on workpiece 1, and the material of workpiece 1 is nickel-base high-temperature single crystal alloy, model
DD6, size is 50mm × 100mm × 2mm, and the surface of workpiece 1 scribbles thermal barrier coating, and thermal barrier coating includes tack coat 2 and ceramic layer
3, the thickness of tack coat 2 is about 0.1mm, and the thickness of ceramic layer 3 is about 0.3mm, and the material of tack coat 2 is NiCoCrAlY, ceramic layer 3
Material is 6%-8%Y2O3ZrO2。
Reference picture 1, a kind of laser remolten thermal barrier coating preparation technology for suppressing single crystal substrate recrystallization, including following steps
Suddenly：
1) workpiece 1 of the nickel-base high-temperature single crystal alloy with thermal barrier coating is fixed on heat conducting sleeve 5, heat conducting sleeve 5 to placement
In radio-frequency induction coil 4, and it is placed on together in heat shield 6, heat shield 6 is fixed on fixture 8, fixture 8 is fixed on five axles
On motion workbench 11,5-axis movement workbench 11 is connected by kinetic control system 16 and computer 13, and high-frequency inductor 7 passes through
The sensing heating heat conducting sleeve 5 of induction coil 4, heat transfer is realized to high temperature alloy matrix 1 to workpiece 1 after heat conducting sleeve 5 is heated
Preheating, computer 13 controls the setting for realizing laser remolten parameter of laser 14, laser 14 to launch after being controlled through computer 13
Laser through lens 10 focus on after be radiated on ceramic layer 3, computer 13 passes through temperature monitor 15 and infrared thermography instrument 12
Connection；
2) on the premise of the whole remelting ceramic coatings 3 of laser energy are ensured, the power output of laser is reduced as far as possible, to keep away
Exempt from influence of the laser energy to workpiece 1, adjust laser remolten parameter：Regulation laser single-pulse energy is 7J, laser pulse width
For 1ms, repetition rate is 40HZ, and laser spot diameter is 3mm；
3) programmed according to the size of workpiece 1 in kinetic control system 16 in laser remolten route, this example, laser head 9
Fixed, 5-axis movement workbench 11 drives fixture 8 to move, and the accurate control of sweep speed is realized by kinetic control system 16
System, sets laser scanning speed as 5mm/s, and scan mode is multi-track overlapping method；
4) operating power of regulation high-frequency inductor 7 is 20KW,
5) after the temperature of infrared thermography instrument 12 reaches 200 DEG C and stabilization, laser 14, open movement control system are opened
System 16 makes 5-axis movement workbench 11 by the programming line-of-road movement of setting, carries out laser remolten.
Above procedure is repeated, ceramic layer 3 is preheating to 0 DEG C, 600 DEG C, 800 DEG C respectively, accordingly adjusts different laser weights
Molten parameter, then carry out radio-frequency preheating laser remolten experiment.After above-mentioned laser remolten, different preheating temperature interface monocrystalline bases
Body tissue is different, such as Fig. 2, preheats as 0 DEG C (not preheating) and to preheat be 200 DEG C of workpiece, the single crystal substrate that near interface goes out
There is obvious recrystallization trend, preheating is 600 DEG C and when preheating is 800 DEG C, and single crystal organization is uniform, no distortion of lattice, without again
Crystallization tendency.Therefore, the inventive method can be effectively prevented from the recrystallization phenomenon of single crystal substrate during laser remolten.
Claims (1)
1. a kind of laser remolten thermal barrier coating preparation technology for suppressing single crystal substrate recrystallization, it is characterised in that including following steps
Suddenly：
1) workpiece (1) of the single crystal super alloy with thermal barrier coating is fixed on heat conducting sleeve (5), heat conducting sleeve (5) is placed on sensing
In coil (4), and it is placed on together in heat shield (6), heat shield (6) is fixed on 5-axis movement workbench by fixture (8)
(11) on, 5-axis movement workbench (11) is connected by kinetic control system (16) and computer (13), and high-frequency inductor (7) is through height
Frequency induction coil (4) heating heat conducting sleeve (5), heat conducting sleeve (5) transfers heat to workpiece (1), computer (13) control laser
(14) laser launched in the setting for realizing laser remolten parameter, laser (14) is radiated at pottery after being focused on through lens (10)
On enamel coating (3), computer (13) is connected by temperature monitor (15) and infrared thermography instrument (12)；
2) on the premise of the whole remelting ceramic coatings (3) of laser energy are ensured, the power output of laser is reduced as far as possible, and regulation swashs
Light remelting parameter：Regulation laser single-pulse energy is 6J~7J, and laser pulse width is 0.5ms~1ms, and repetition rate is 40HZ
~50HZ, laser spot diameter is 3mm~4mm；
3) laser remolten route is programmed in kinetic control system (16) according to the size of workpiece (1), sets laser scanning speed
For 5~10mm/s, scan mode is multi-track overlapping method；
4) operating power of regulation high-frequency inductor (7) is 20KW~25KW；
5) after infrared thermography instrument (12) temperature reaches 0 DEG C~800 DEG C and stabilization, laser (14), open movement are opened
Control system (16) makes 5-axis movement workbench (11) by the programming line-of-road movement of setting, carries out laser remolten.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710509497.3A CN107326318A (en) | 2017-06-28 | 2017-06-28 | A kind of laser remolten thermal barrier coating preparation technology for suppressing single crystal substrate recrystallization |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710509497.3A CN107326318A (en) | 2017-06-28 | 2017-06-28 | A kind of laser remolten thermal barrier coating preparation technology for suppressing single crystal substrate recrystallization |
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| CN107326318A true CN107326318A (en) | 2017-11-07 |
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| CN201710509497.3A Pending CN107326318A (en) | 2017-06-28 | 2017-06-28 | A kind of laser remolten thermal barrier coating preparation technology for suppressing single crystal substrate recrystallization |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108220953B (en) * | 2017-12-27 | 2019-12-31 | 中国石油大学(华东) | Laser surface treatment method for improving heat corrosion resistance of thermal barrier coating |
| CN114309659A (en) * | 2021-11-19 | 2022-04-12 | 中国航发北京航空材料研究院 | High-temperature alloy laser rapid forming system and forming method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19906765A1 (en) * | 1999-02-17 | 2000-08-24 | Euromat Gmbh | Protective coating or repair, e.g. of pipeline, turbine blade, engine part, glass molding part or tool, is carried out by thermal bonding of pressed metal powder strip |
| EP2140042A1 (en) * | 2007-03-17 | 2010-01-06 | KS Kolbenschmidt GmbH | Production of a partial fiber composite structure in a component using a laser remelting treatment |
| CN103088337A (en) * | 2013-01-31 | 2013-05-08 | 南昌航空大学 | Method for laser-induction hybrid cladding of copper composite coating dispersedly strengthened by carbon nanotubes (CNTs) |
| CN103276394A (en) * | 2013-06-17 | 2013-09-04 | 铜陵学院 | Laser remelting one-step reinforcing processing method and device thereof for plasma sprayed thermal barrier coating with double-layer structure |
| CN103993313A (en) * | 2014-05-29 | 2014-08-20 | 西安交通大学 | Preparation process of densely-arranged columnar crystal ceramic coating based on laser remelting technology |
-
2017
- 2017-06-28 CN CN201710509497.3A patent/CN107326318A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19906765A1 (en) * | 1999-02-17 | 2000-08-24 | Euromat Gmbh | Protective coating or repair, e.g. of pipeline, turbine blade, engine part, glass molding part or tool, is carried out by thermal bonding of pressed metal powder strip |
| EP2140042A1 (en) * | 2007-03-17 | 2010-01-06 | KS Kolbenschmidt GmbH | Production of a partial fiber composite structure in a component using a laser remelting treatment |
| CN103088337A (en) * | 2013-01-31 | 2013-05-08 | 南昌航空大学 | Method for laser-induction hybrid cladding of copper composite coating dispersedly strengthened by carbon nanotubes (CNTs) |
| CN103276394A (en) * | 2013-06-17 | 2013-09-04 | 铜陵学院 | Laser remelting one-step reinforcing processing method and device thereof for plasma sprayed thermal barrier coating with double-layer structure |
| CN103993313A (en) * | 2014-05-29 | 2014-08-20 | 西安交通大学 | Preparation process of densely-arranged columnar crystal ceramic coating based on laser remelting technology |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108220953B (en) * | 2017-12-27 | 2019-12-31 | 中国石油大学(华东) | Laser surface treatment method for improving heat corrosion resistance of thermal barrier coating |
| CN114309659A (en) * | 2021-11-19 | 2022-04-12 | 中国航发北京航空材料研究院 | High-temperature alloy laser rapid forming system and forming method |
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Application publication date: 20171107 |