CN103266295A - Laser surfacing modification method for thermal barrier coating - Google Patents
Laser surfacing modification method for thermal barrier coating Download PDFInfo
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Abstract
一种热障涂层激光表面改性方法，首先对基体的表面进行清洗和喷砂处理；然后在基体的表面制备热喷涂态的热障涂层；然后对热障涂层中即将制备的桩钉结构激光改性单元体的形状、尺寸、排布规律和分布密度进行设计；然后按设计模型调节激光器的加工参数；然后对热障涂层进行激光改性；最后对激光改性后的热障涂层进行去应力退火处理。本发明由于采用了在热障涂层中设置不连续的、分散的桩钉结构强化单元体的方法，使热涨涂层既能产生软硬交替变化的特征，又能产生“钉扎效应”，这样既减缓了涂层的裂纹尖端应力集中，降低了涂层的裂纹率，又极大地提高了各涂层间的结合强度，延长了热障涂层的热疲劳寿命，并改善了涂层组织结构，提高了涂层的致密度。
A laser surface modification method for thermal barrier coatings, first cleaning and sandblasting the surface of the substrate; then preparing a thermal sprayed thermal barrier coating on the surface of the substrate; Design the shape, size, arrangement and distribution density of the nail structure laser modification unit; then adjust the processing parameters of the laser according to the design model; then perform laser modification on the thermal barrier coating; The barrier coating was subjected to stress relief annealing. Because the present invention adopts the method of discontinuous and dispersed peg structure strengthening units in the thermal barrier coating, the thermal expansion coating can not only produce the characteristics of alternating soft and hard, but also produce the "pinning effect" , which not only slows down the stress concentration at the crack tip of the coating, reduces the crack rate of the coating, but also greatly improves the bonding strength between the coatings, prolongs the thermal fatigue life of the thermal barrier coating, and improves the coating organizational structure, improving the density of the coating.
Description
Technical field
The invention belongs to thermal barrier coating preparation and modification technology field, specifically relate to a kind of thermal barrier coating by laser surface modifying method with dowel pin constitutional features.
Background technology
Thermal barrier coating be with high temperature resistant, high heat insulation coated materials on the matrix alloy surface, to improve the matrix alloy high-temperature resistance, reduce a kind of thermal protection technology of its surface temperature.Thermal barrier coating not only has broad application prospects in fields such as naval vessel, the energy, develops the requisite gordian technique of aircraft engine of future generation simultaneously especially.Along with aircraft engine develops to high thrust-weight ratio, the design inlet temperature of engine improves constantly, use high-temperature structural material can not meet design requirement separately, adopting Thermal Barrier Coating Technologies is to increase substantially the practicable method of aircraft engine working temperature at present.
The typical aviation thermal barrier coating of practical application mostly is bilayer structure, namely is divided into ceramic layer and the middle tack coat on top layer.Wherein, ceramic layer material is generally the partially stabilized zirconium white of 7%-8% yttrium oxide, and by the method preparation of air plasma spraying or electro beam physics vapour deposition, the thermal conductivity of ceramic layer is lower, mainly plays heat-blocking action.It is tack coat between ceramic layer and matrix, the general purpose material of this layer is MCrAlY at present, wherein M represents the mixture of Ni, Co or Ni and Co, tack coat is by the method preparation of low-voltage plasma spraying or hypersonic flame spraying, its function is the thermal expansion mismatch of improving between matrix and the ceramic layer, prevents that matrix is by high temperature oxidation and corrosion.
Though thermal barrier coating has been widely used in the hot-end component of engine at present, its early stage spalling failure problem is very serious, also needs the work-ing life of thermal barrier coating further to improve.Studies show that: the tissue defects of coating inside, the inner big internal stress that produces of coating under the thermal load effect, the intrinsic problems such as coating bonding force difference of the formation of coating interface thermal growth oxide and growth and hot-spraying techniques are to influence the thermal barrier coating principal element in work-ing life.Although a lot of about material, structure and the research of preparation technology aspect of thermal barrier coating, the early stage spalling failure problem of thermal barrier coating still exists.In recent years, aspect raising thermal barrier coating performance and life-span, adopt laser and thermospray compounding technology to cause domestic and international expert's concern gradually, and become the research focus.But present thermal barrier coating by laser surface modifying method also exists some drawbacks: on the one hand, can improve coating density and bonding strength to the whole laser remolten of thermal barrier coating, but also will produce tack coat and problems such as ceramic layer mutual diffusion and dilution; On the other hand, ceramic layer is carried out the top layer laser remolten can reduce the crackle rate, prevent the bonded layer dilution of ceramic layer, but in ceramic layer, introduce new interface inevitably, produce big unrelieved stress, and this method is meaningless to improving ceramic layer and tack coat bonding strength.Therefore, the laser modified technology of thermal barrier coating presses for and is obtaining innovation aspect methodology and the structure design thought and breaking through.
Summary of the invention
The objective of the invention is at above-mentioned existing problems and deficiency, a kind of thermal barrier coating by laser surface modifying method that can significantly improve thermal barrier coating performance and work-ing life with dowel pin constitutional features is provided.
Technical scheme of the present invention is achieved in that
Thermal barrier coating by laser surface modifying method of the present invention is characterized in comprising the steps:
A, processing sequence is cleaned and sandblasting the surface of matrix routinely;
B, at the thermal barrier coating of the surface preparation thermospray attitude of matrix, this thermal barrier coating comprises ceramic layer and tack coat, during making, is at first to make tack coat on the surface of matrix, makes ceramic layer on the surface of tack coat again;
C, by computer and design software shape, size, the rule of arranging and the distribution density that is about to the laser modified cell cube of dowel pin structure of preparation in the thermal barrier coating designed;
D, regulate the machined parameters of laser apparatus by designing a model;
E, thermal barrier coating is carried out laser modified, make to be formed with the laser modified cell cube of dowel pin structure that C set by step sets in the thermal barrier coating;
F, the thermal barrier coating after laser modified is carried out stress relief annealing handle.
Wherein, the laser modified cell cube of above-mentioned dowel pin structure is for being inverted spherical cell cube, this exposed surface of being inverted spherical cell cube is for circular, and this circular surface diameter of being inverted spherical cell cube is 0.5mm～2.5mm, and this height of being inverted spherical cell cube is 210 μ m～440 μ m.
The laser modified cell cube of dowel pin structure in the above-mentioned thermal barrier coating is arranged to equidistant parallel arrangement or equidistantly staggered, the edge spacing of adjacent two laser modified cell cubes of dowel pin structure is 1mm～4mm, and the total surface area of all laser modified cell cubes of dowel pin structure accounts for 10%～60% of thermal barrier coating surface-area in the thermal barrier coating.
It is the Nd:YAG solid pulse laser of 500W～1000W that above-mentioned laser apparatus adopts rated output, and the electric current of this laser apparatus is 100A～300A, and pwm value is 3ms～10ms, and frequency values is 1 ~ 10Hz.
Among the above-mentioned steps E, carrying out laser modified to thermal barrier coating is to adopt manual mode to control laser input pulse quantity, and the laser input pulse quantity for preparing the laser modified cell cube of each dowel pin structure is 1～6.
It is to carry out in vacuum heat treatment furnace that the stress relief annealing of above-mentioned thermal barrier coating is handled, and Heating temperature is 600 ℃～700 ℃, and soaking time is 1h～2h, and furnace cooling.
Above-mentioned ceramic layer adopts the method for air plasma spraying to make, and the thickness of ceramic layer is 150 μ m～350 μ m.
Above-mentioned tack coat adopts the method for low-voltage plasma spraying or hypersonic flame spraying to make, and the thickness of tack coat is 50 μ m～100 μ m.
The present invention is owing to adopted the laser surface modification method that the structure-reinforced cell cube of dowel pin is set in thermal barrier coating, can form the laser modified cell cube of " timber " type discontinuous, that disperse in the breadth wise dimension of thermal barrier coating, has the reinforced structure that soft or hard replaces variation characteristic thereby produce, so both can reduce and the laser modified stress of lax coating, reduce the crackle rate, can realize resisting between coat layer again and the longitudinal crack expansion, the purpose of slowing down the crack tip stress concentration; Simultaneously, can form perforation ceramic layer and tack coat at the vertical scale of thermal barrier coating until the laser modified cell cube of " nail wedge " shape near matrix by this method, generation has the reinforced structure of " pinning effect ", laser modified cell cube connects ceramic layer and tack coat, so both can form local metallurgical binding at the two interface, make anchoring strength of coating can improve more than 40%, destroy the continuity of interface thermal growth oxide, make the thermal fatigue life of thermal barrier coating can improve 1-4 doubly, can greatly improve coating texture again, in ceramic layer, formed and be different from the columanar structure that sprays attitude, make the coatingsurface roughness be improved significantly, improve the coating density, eliminated the residual pore of thermospray attitude effectively, defective such as be mingled with.
The present invention is further illustrated below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is the cross section shape appearance figure of thermospray attitude thermal barrier coating in the embodiment of the invention one.
Fig. 2 is the laser surface modification outside drawing of thermal barrier coating in the embodiment of the invention one.
Fig. 3 is the surface topography map of the laser modified cell cube of dowel pin structure of thermal barrier coating in the embodiment of the invention one.
Fig. 4 is columanar structure's synoptic diagram of the laser modified cell cube of the embodiment of the invention one king-pile pin structure.
Embodiment
Embodiment one:
Technical process is cleaned and sandblasting GH4169 superalloy matrix at first, routinely; Then, thermal barrier coating in the surface preparation thermospray attitude of matrix, because this thermal barrier coating is made up of ceramic layer and tack coat, during making, be to adopt supersonic spray coating to prepare the NiCoCrAlYTa tack coat of the about 60 μ m of thickness earlier, adopt air plasma spraying to prepare the 7% yttrium oxide partial stabilization zirconium oxide ceramic layer of the about 200 μ m of thickness again, and the cross section pattern of the thermal barrier coating of this thermospray attitude as shown in Figure 1; Then, design the laser modified cell cube of dowel pin structure by computer and design software, the laser modified cell cube of this dowel pin structure is for being inverted spherical cell cube, this exposed surface of being inverted spherical cell cube is for circular, this circular surface diameter of being inverted spherical cell cube is 2mm, this height of being inverted spherical cell cube is 230 μ m, and the rule of arranging of being inverted spherical cell cube setting is equidistant parallel arrangement, it arranges rule as shown in Figure 2, and adjacent two edge spacings of being inverted spherical cell cube are 2mm, and the total surface area of all laser modified cell cubes of dowel pin structure accounts for 25% of thermal barrier coating surface-area in the thermal barrier coating; Then, adopt the Nd:YAG pulsed solid stale laser of rated output 600W that thermal barrier coating is carried out laser surface modification, just in thermal barrier coating, produce the laser modified cell cube of needed dowel pin structure by designing a model, and laser diode current input 200A, pwm value is 6ms, frequency is 7Hz, and be to adopt manual control mode to make the laser modified cell cube of each dowel pin structure of processing only import 2 bundle of pulsed laser, from Fig. 3, can clearly be seen that the surface topography of the single dowel pin structure laser modified cell cube of preparation in thermal barrier coating; At last, the thermal barrier coating after laser modified is put into vacuum heat treatment furnace, heat 700 ℃, insulation 1h, taking-up gets final product behind the furnace cooling.Owing to formed at the vertical scale of thermal barrier coating and to have connected ceramic layer and tack coat until the laser modified cell cube of " nail wedge " shape near matrix, generation has the reinforced structure of " pinning effect ", and in ceramic layer, formed and be different from the columanar structure that sprays attitude, this columanar structure as shown in Figure 4, thereby make the coatingsurface roughness be improved significantly, improved the coating density, eliminated the residual pore of thermospray attitude effectively, defective such as be mingled with.
Embodiment two:
Technical process is cleaned and sandblasting GH4169 superalloy matrix at first, routinely; Thermal barrier coating in the surface preparation thermospray attitude of matrix, because this thermal barrier coating is made up of ceramic layer and tack coat, during making, be to adopt low-voltage plasma spraying to prepare the NiCoCrAlYTa tack coat of the about 100 μ m of thickness earlier, adopt air plasma spraying to prepare the 7% yttrium oxide partial stabilization zirconium oxide ceramic layer of the about 300 μ m of thickness again; Then, design the laser modified cell cube of dowel pin structure by computer and design software, the design of the laser modified cell cube of this dowel pin structure is to finish by computer and design software, the laser modified cell cube of this dowel pin structure is for being inverted spherical cell cube, this exposed surface of being inverted spherical cell cube is for circular, this circular surface diameter of being inverted spherical cell cube is 1.8mm, this height of being inverted spherical cell cube is 320 μ m, and be inverted the rule of arranging of spherical cell cube setting for equidistantly staggered, and adjacent two edge spacings of being inverted spherical cell cube are 2mm, and the total surface area of all laser modified cell cubes of dowel pin structure accounts for 20% of thermal barrier coating surface-area in the thermal barrier coating; Then, adopt the Nd:YAG pulsed solid stale laser of rated output 800W that thermal barrier coating is carried out laser surface modification, just in thermal barrier coating, produce the laser modified cell cube of needed dowel pin structure by designing a model, and laser diode current input 220A, pwm value is 7ms, frequency is 10Hz, and is to adopt manual control mode to make each laser modified cell cube of processing only import 3 bundle of pulsed laser; At last, the thermal barrier coating after laser modified is put into vacuum heat treatment furnace, heat 650 ℃, insulation 1h, taking-up gets final product behind the furnace cooling.
The present invention describes by embodiment, but the present invention is not construed as limiting, with reference to description of the invention, other variations of the disclosed embodiments, expect easily that as the professional person for this area such variation should belong within the claim restricted portion of the present invention.
Claims (8)
1. a thermal barrier coating by laser surface modifying method is characterized in that comprising the steps:
A, processing sequence is cleaned and sandblasting the surface of matrix routinely.
B, at the thermal barrier coating of the surface preparation thermospray attitude of matrix, this thermal barrier coating comprises ceramic layer and tack coat, during making, is at first to make tack coat on the surface of matrix, makes ceramic layer on the surface of tack coat again.
C, by computer and design software shape, size, the rule of arranging and the distribution density that is about to the laser modified cell cube of dowel pin structure of preparation in the thermal barrier coating designed;
D, regulate the machined parameters of laser apparatus by designing a model.
E, thermal barrier coating is carried out laser modified, makes to be formed with the laser modified cell cube of dowel pin structure that C set by step sets in the thermal barrier coating.
F, the thermal barrier coating after laser modified is carried out stress relief annealing handle.
2. according to the described thermal barrier coating by laser surface modifying method of claim 1, it is characterized in that the laser modified cell cube of above-mentioned dowel pin structure is for being inverted spherical cell cube, this exposed surface of being inverted spherical cell cube is for circular, this circular surface diameter of being inverted spherical cell cube is 0.5mm～2.5mm, and this height of being inverted spherical cell cube is 210 μ m～440 μ m.
3. according to the described thermal barrier coating by laser surface modifying method of claim 1, it is characterized in that the laser modified cell cube of dowel pin structure in the above-mentioned thermal barrier coating is arranged to equidistant parallel arrangement or equidistantly staggered, the edge spacing of adjacent two laser modified cell cubes of dowel pin structure is 1mm～4mm, and the total surface area of all laser modified cell cubes of dowel pin structure accounts for 10%～60% of thermal barrier coating surface-area in the thermal barrier coating.
4. according to the described thermal barrier coating by laser surface modifying method of claim 1, it is characterized in that it is the Nd:YAG solid pulse laser of 500W～1000W that above-mentioned laser apparatus adopts rated output, the electric current of this laser apparatus is 100A～300A, and pwm value is 3ms～10ms, and frequency values is 1 ~ 10Hz.
5. according to the described thermal barrier coating by laser surface modifying method of claim 1, it is characterized in that among the above-mentioned steps E, carrying out laser modified to thermal barrier coating is to adopt manual mode to control laser input pulse quantity, and the laser input pulse quantity for preparing the laser modified cell cube of each dowel pin structure is 1～6.
6. according to the described thermal barrier coating by laser surface modifying method of claim 1, it is characterized in that the stress relief annealing processing of above-mentioned thermal barrier coating is to carry out in vacuum heat treatment furnace, Heating temperature is 600 ℃～700 ℃, and soaking time is 1h～2h, and furnace cooling.
7. according to the described thermal barrier coating by laser surface modifying method of claim 1, it is characterized in that above-mentioned ceramic layer adopts the method for air plasma spraying to make, and the thickness of ceramic layer is 150 μ m～350 μ m.
8. according to the described thermal barrier coating by laser surface modifying method of claim 1, it is characterized in that above-mentioned tack coat adopts the method for low-voltage plasma spraying or hypersonic flame spraying to make, and the thickness of tack coat is 50 μ m～100 μ m.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108411242A (en) * | 2018-01-31 | 2018-08-17 | 广东省新材料研究所 | A kind of thermal barrier coating and preparation method thereof with anti-particle erosion superficial layer |
| CN110387520A (en) * | 2019-09-04 | 2019-10-29 | 吉林大学 | Gradient coating for anti-cracking and anti-stripping biomimetic embankment structure and its preparation method |
| CN108220953B (en) * | 2017-12-27 | 2019-12-31 | 中国石油大学(华东) | A Laser Surface Treatment Method for Improving Thermal Corrosion Resistance of Thermal Barrier Coatings |
| CN111099893A (en) * | 2019-12-04 | 2020-05-05 | 天津大学 | Method for improving melting resistance CMAS corrosion of thermal barrier coating by laser surface treatment |
| CN111334747A (en) * | 2020-02-17 | 2020-06-26 | 江苏大学 | Surface texture of a thermal barrier coating and processing method thereof |
| CN112011755A (en) * | 2020-08-27 | 2020-12-01 | 西安石油大学 | Longitudinal hole forming method of layered thermal barrier coating based on reverse deformation and thermal barrier coating |
| CN112126889A (en) * | 2020-08-21 | 2020-12-25 | 中国地质大学（武汉） | Method for optimizing thermal barrier coating stability by constructing bionic structure through 3D printing |
| US11828196B2 (en) | 2022-01-28 | 2023-11-28 | Rtx Corporation | Gas turbine engine article with serpentine groove for coating interlock |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108220953B (en) * | 2017-12-27 | 2019-12-31 | 中国石油大学(华东) | A Laser Surface Treatment Method for Improving Thermal Corrosion Resistance of Thermal Barrier Coatings |
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| CN112126889A (en) * | 2020-08-21 | 2020-12-25 | 中国地质大学（武汉） | Method for optimizing thermal barrier coating stability by constructing bionic structure through 3D printing |
| CN112011755A (en) * | 2020-08-27 | 2020-12-01 | 西安石油大学 | Longitudinal hole forming method of layered thermal barrier coating based on reverse deformation and thermal barrier coating |
| US11828196B2 (en) | 2022-01-28 | 2023-11-28 | Rtx Corporation | Gas turbine engine article with serpentine groove for coating interlock |
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