CN111334747A - Surface texture of thermal barrier coating and processing method thereof - Google Patents

Surface texture of thermal barrier coating and processing method thereof Download PDF

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CN111334747A
CN111334747A CN202010097430.5A CN202010097430A CN111334747A CN 111334747 A CN111334747 A CN 111334747A CN 202010097430 A CN202010097430 A CN 202010097430A CN 111334747 A CN111334747 A CN 111334747A
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CN111334747B (en
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陈天阳
符永宏
纪敬虎
张显程
符昊
杨锡平
王鸥
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Jiangsu University
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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
    • 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
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
    • C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer

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Abstract

The invention provides a surface texture of a thermal barrier coating and a processing method thereof, wherein an interface between a substrate and the coating is used as a texture surface, or a plane which is positioned on the interface and deviates into the coating is used as the texture surface, and a plurality of special-shaped appearances are regularly distributed on the texture surface. The interface between the substrate and the coating is specifically the interface between the substrate and the bonding layer or the interface between the bonding layer and the functional coating. The invention utilizes a plurality of laser composite processing technologies to process regularly distributed special-shaped appearances on the texture surface so as to achieve the effects of strong combination of the coating, optimization of the internal stress of the coating and inhibition of crack propagation.

Description

Surface texture of thermal barrier coating and processing method thereof
Technical Field
The invention relates to the field of surface engineering, in particular to a surface texture of a thermal barrier coating and a processing method thereof.
Background
The current technologies for preparing thermal barrier coatings mainly comprise plasma spraying, electron beam-physical vapor deposition, high-speed flame spraying technology, laser cladding and the like. The plasma spraying has the advantages of mature process, high deposition efficiency and the like, the prepared thermal barrier coating has a fish scale-shaped layered structure, but is mechanically combined with the base material with poor bonding force, and the base material is easy to peel off in the use process due to the thermal mismatching between the base material and the bonding layer, the bonding layer and the functional coating, so that the overall service life is influenced.
Chinese patent discloses a coating preparation method for improving the binding force of a thermal barrier coating and a substrate, which adopts industrial NiCrAlY composite powder as a bottom layer, adopts a step of plasma spraying the thermal barrier coating and adopts industrial ZrO2+8Y2O3In order to spray powder, a step of plasma spraying an anti-oxidation layer is carried out, and before the step of plasma spraying a thermal barrier coating, the surface of a substrate, namely the high-temperature alloy, is subjected to micro-modeling by adopting femtosecond laser, so that the bonding strength of the coating and the substrate is improved. According to the technical scheme, the micro-pit array on the surface of the substrate is used as a mechanical anchoring point between the coating and the substrate, although the bonding force between the coating and the substrate can be improved to a certain degree, the diameter of the adopted light spot is 22 mu m, and the depth of the prepared micro-hole reaches 30-50 mu m, namely the micro-hole is a deep micro-hole with a small diameter, and the micro-hole structure is not beneficial to the entering of coating particles and is easy to generate pore defects; meanwhile, although the micropores prepared by the femtosecond laser can obtain better appearance quality, the slag defects at the edges and inner walls of the micropores can generate crack sources in the coating, and the coating is easy to peel off; in addition, the copying performance of the adopted morphology is poor, the binding force between the substrate and the binding layer is optimized, but the difficult problem of poor binding force between the binding layer and the functional coating cannot be effectively solved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a surface texture of a thermal barrier coating and a processing method thereof, which select a specific surface in a substrate and the coating as a texture surface, and process regularly distributed cross-scale concave-convex composite special-shaped morphology on the texture surface in multiple steps by utilizing various laser composite processing technologies so as to achieve the effects of strong combination of the coating, optimization of the internal stress of the coating and inhibition of crack propagation of the coating.
The present invention achieves the above-described object by the following technical means.
The surface texture of the thermal barrier coating takes an interface between a substrate and the coating as a texture surface, or takes a plane which is positioned on the interface and deviates into the coating as the texture surface, and a plurality of special-shaped appearances are regularly distributed on the texture surface.
Further, the interface between the substrate and the coating is specifically the interface between the substrate and the bonding layer or the interface between the bonding layer and the functional coating.
Further, let the distance of the texture surface offset interface be Th, and its value be:
Figure BDA0002385587730000021
wherein: TH0＝(1-OB)*TH1+OB*TH2，layer0＝(1-OB)*layer1+OB*layer2；
When Th is 0, the texture surface is an interface; when Th is equal to Th1While the texture surface is located in the coating layer and at a distance Th from the interface1A plane of (a);
wherein: th is the distance of the texture surface offset interface;
OB is a surface texture object symbol, and when OB is 0, the interface between the substrate and the coating is the interface between the matrix and the bonding layer; when OB is 1, the interface between the substrate and the coating is the interface between the bonding layer and the functional coating;
Nasfis the internal texture coefficient of the coating; layer0The thickness of the single-layer coating layer after the single-layer coating particles are attached; layer1The thickness of the single-layer coating after the single-layer particles of the bonding layer are attached; layer2The thickness of the single-layer coating is the thickness of the single-layer coating after the single-layer particles of the functional coating are attached; TH0Is the total thickness of the coating; TH1The total thickness of the bonding layer; TH2The total thickness of the functional coating.
Further, when the texture surface is a plane in which the interface between the substrate and the bonding layer or the interface between the bonding layer and the functional coating or the interface between the substrate and the bonding layer is shifted inwards towards the bonding layer, the special-shaped morphology comprises an annular micro-peak platform and an inclined saccular pit; the inclined saccular pits are positioned at or near the center of the annular micro-peak platform;
when the texture surface is a plane in which the interface surface between the bonding layer and the functional coating is deviated towards the inside of the functional coating, the special-shaped appearance is an inclined saccular pit.
Further, the special-shaped morphology parameter is
Figure BDA0002385587730000022
The specific morphology parameters are as follows:
the appearance parameters of the annular micro-peak platform are as follows:
Figure BDA0002385587730000023
the morphology parameters of the inclined saccular pits are as follows:
Figure BDA0002385587730000024
wherein: mor is a special-shaped morphology parameter set; morringIs a feature parameter set of the annular micro-peak platform; morPurseA set of topographical parameters for the tilted bladder pocket; drIs the ring diameter of the annular microfacet; width is the peak platform section width of the annular micro-peak platform; height is the peak platform section height of the annular micro peak platform;
tau is the coefficient of the annular micro-peak table,
Figure BDA0002385587730000031
wherein D isouterA closed diameter of the inclined saccular pits; dmiddleThe diameter of the middle expanding part of the inclined saccular pit, Depth of the inclined saccular pit, α of the inclination of the inclined saccular pit, d0Is the particle size of the coating, d0＝(1-OB)*d1+OB*d2；d1Particle size of the coating for the bonding layer; d2Is the particle size of the functional coating.
Further, the angle of inclination α of the inclined bladder-like depression coincides with the direction of thermal shock experienced by the coating.
A processing method of the surface texture of the thermal barrier coating comprises the following steps:
at the texture point on the texture surface, pulse Laser is fused by high-energy Laser1Acting on a point to be textured along the normal of the texture surface; pulse Laser fused by broad area Laser1_wBreaking through the melting threshold of the texture surface material, carrying out heat treatment on the texture surface material, and forming a molten pool; by local Laser ablation of pulsed Laser1_aBreaking through the ablation threshold of materials in the molten pool, carrying out laser ablation processing on local points in the molten pool, and generating eccentric recoil pressure on the molten pool by plasma generated by ablation so as to enable the molten mass to flow and form an annular micro-peak platform and an inclined micro-capsule pit;
laser ablation of pulses by rotating rough machining2_rThe liquid enters the inclined saccular pit at an angle of α, and is scanned along the inner wall of the inclined saccular pit in a profiling way to expand the inclined saccular pit;
laser ablation of pulses by rotary fine machining2_fEntering the inclined saccular pit at an angle of α, scanning along the inner wall of the inclined saccular pit in a profiling mode, and carrying out thinning processing on the surface of the inclined saccular pit;
by rotating a low-energy Laser-lustrated pulse Laser3The surface of the inclined saccular pit is fused and repaired by scanning along the inner wall of the inclined saccular pit at an angle of α, and the fused and repaired surface is used for forming a smooth hard shell.
Further, the large-energy Laser fusing pulse is a combined Laser pulse formed by a wide-area Laser fusing pulse and a local Laser ablation pulse which are modulated in a time-space domain, and the Laser parameter is Laser1＝{Laser1_W，Laser1_aχ, ψ }, wherein:
Figure BDA0002385587730000032
Figure BDA0002385587730000033
Figure BDA0002385587730000034
wherein, Δ P ═ P2-P1；Dmor＝(dr+width)+(1-τ)*Douter；
The Laser ablation pulse is a pulse train of nanosecond/ultrafast Laser pulse combination and comprises a rough machining Laser ablation pulse Laser2_rAnd finishing the Laser ablation pulses Laser2_fThe specific parameters are as follows:
Figure BDA0002385587730000041
Figure BDA0002385587730000042
the low-energy Laser luster pulse Laser3The method is a small-energy laser fusing pulse, and the specific parameters are as follows:
Figure BDA0002385587730000043
wherein:
Laser1fusing pulse laser parameters for the high-energy laser; laser1_WPulse laser parameters for broad area laser consolidation; laser1_aThe parameters are local laser ablation pulse laser parameters; laser2_rRough machining laser ablation pulse laser parameters; laser2_rFine machining laser ablation pulse laser parameters; laser3The parameters of the small-energy laser polishing pulse laser are adopted; χ is the time domain difference proportion of the wide area laser fusing pulse and the local laser ablation pulse; psi is the spatial difference proportion of the wide area laser melting pulse and the local laser ablation pulse; PluseWidth is the pulse width of the laser pulse; p is the peak power of the laser pulse; p1Is the material melting threshold; p2For burning of materialsAn erosion threshold; Δ P is the difference between the material ablation threshold and the material melting threshold; f is the laser pulse output frequency; m2A laser pulse mode; dfIs the spot diameter of the laser pulse; num is the number of nanosecond/ultrafast laser pulses in the laser ablation pulses; Δ t is the output time difference between the wide-area laser fusion pulse and the local laser ablation pulse; e is the spot center distance of the wide area laser melting pulse and the local laser ablation pulse; dmorThe diameter is a cross-scale concave-convex composite heterogeneous morphology diameter; PulseWidth1_wA pulse width that is a broad area laser consolidation pulse;
Figure BDA0002385587730000044
spot diameter for a broad area laser consolidation pulse;
Figure BDA0002385587730000045
is the spot diameter of the local laser ablation pulse.
The invention has the beneficial effects that:
1. the surface texture of the thermal barrier coating has the advantages that the adopted composite morphology of the annular micro-peak platform and the inclined saccular pits or the single inclined saccular pits has better copying capability, and meanwhile, the selected texture surface gives consideration to the interfaces of the substrate and the bonding layer of the thermal barrier coating, the bonding layer and the functional coating, so that the integral bonding strength of the coating and the substrate can be effectively improved.
2. According to the surface texture of the thermal barrier coating, the adopted composite morphology of the annular micro-peak platform and the inclined saccular pits respectively plays roles of interface tangential occlusion and normal anchoring, and the bonding strength of the coating and a substrate can be greatly improved.
3. According to the surface texture of the thermal barrier coating, the saccular pits form hard shells under the laser hardening effect, and the hard shells can be used as stress release spaces, so that the bonding toughness of the coating and a substrate can be effectively improved, and the residual stress state/size/distribution/aging performance in the coating is optimized, so that the crack initiation of the coating is inhibited.
4. According to the processing method of the thermal barrier coating surface texture, the large-energy laser fusion pulse bombardment is adopted to quickly form the special-shaped appearance, then the inclined saccular pit is roughly/finely processed through the laser ablation pulse, and finally the inclined saccular pit surface is trimmed through the small-energy laser decoration pulse.
Drawings
Fig. 1 is a sectional view of the coating layer when OB is 0 and Th is 0.
FIG. 2 shows OB being 0 and Th being Th1The cross-section of the coating.
Fig. 3 is a sectional view of the coating layer when OB is 1 and Th is 0.
FIG. 4 shows OB 1 and Th1The cross-section of the coating.
FIG. 5 is a graph showing the effect of the coating integrally bonded to the substrate.
FIG. 6 is a graph showing the effect of optimizing the internal stress of the coating.
FIG. 7 is a graph showing the effect of inhibiting crack propagation inside the coating.
FIG. 8 is a composite topography profile according to the present invention.
FIG. 9 is a graph of a large energy laser consolidation pulse according to the present invention.
Fig. 10 is a graph of laser ablation pulses according to the present invention.
FIG. 11 is a diagram of a low energy laser grooming pulse in accordance with the present invention.
FIG. 12 is a diagram of a high-energy laser consolidation pulse process according to the present invention.
FIG. 13 is a rough laser ablation pulse processing diagram in accordance with the present invention.
FIG. 14 is a diagram of a finishing laser ablation pulse process according to the present invention.
FIG. 15 is a diagram of the low energy laser finishing pulse process of the present invention.
Fig. 16 is a schematic view of the special laser head processing of the invention.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.
The surface texture of the thermal barrier coating as shown in fig. 1, fig. 2, fig. 3 and fig. 4 is that the interface between the substrate and the coating is taken as a texture surface, or a plane which is located in the interface and is deviated towards the inside of the coating is taken as a texture surface, and a plurality of special-shaped topographies are regularly distributed on the texture surface. By utilizing various laser composite processing technologies, irregularly-shaped features which are regularly distributed are processed on a texture surface, so that the effects of strong bonding of the coating, optimization of internal stress of the coating and inhibition of crack propagation are achieved. The multiple laser composite processing technologies are respectively used for carrying out laser texture processing on the texture surface by utilizing large-energy laser fusion pulses, laser ablation pulses and small-energy laser finishing pulses.
As shown in fig. 5, the heterogeneous morphology is composed of an annular micro-peak platform and an inclined saccular pit, which respectively play roles of tangential occlusion and normal anchoring between the substrate and the coating and can obviously improve the bonding strength between the substrate and the coating; as shown in fig. 6, the capsule pits form hard shells due to laser melting, and the hard shells serve as stress release spaces, so that the bonding toughness of the substrate and the coating can be improved, and the residual stress state/size/distribution/aging performance in the coating can be optimized, thereby inhibiting the initiation of cracks in the coating; as shown in fig. 7, the texture points act as crack traps inside the coating, and can rapidly capture cracks, thereby inhibiting crack propagation.
The interface between the substrate and the coating is specifically the interface between the substrate and the bonding layer or the interface between the bonding layer and the functional coating. Texturing the object with an OB surface, as shown in fig. 1 or 2, wherein when OB is 0, the interface between the substrate and the coating is the interface between the substrate and the bonding layer; when OB is 1, the interface between the substrate and the coating is the interface between the tie layer and the functional coating, as shown in fig. 3 or 4.
Setting the distance of the texture surface offset interface as Th, and the value is as follows:
Figure BDA0002385587730000061
wherein: TH0＝(1-OB)*TH1+OB*TH2，layer0＝(1-OB)*layer1+OB*layer2；
When Th is 0, the texture surface is boundaryKneading; when Th is equal to Th1While the texture surface is located in the coating layer and at a distance Th from the interface1A plane of (a);
wherein: th is the distance of the texture surface offset interface;
OB is a surface texture object symbol, and when OB is 0, the interface between the substrate and the coating is the interface between the matrix and the bonding layer; when OB is 1, the interface between the substrate and the coating is the interface between the bonding layer and the functional coating;
Nasfis the internal texture coefficient of the coating; layer0The thickness of the single-layer coating layer after the single-layer coating particles are attached; layer1The thickness of the single-layer coating after the single-layer particles of the bonding layer are attached; layer2The thickness of the single-layer coating is the thickness of the single-layer coating after the single-layer particles of the functional coating are attached; TH0Is the total thickness of the coating; TH1The total thickness of the bonding layer; TH2The total thickness of the functional coating.
When Th is 0, the texture surface is the interface, the substrate surface is firstly processed by laser texture and then coated, as shown in fig. 1 and fig. 3; th is1The texture surface is located in the coating layer and is at a distance Th from the interface1Firstly, Th is performed on the surface of the substrate1Thick coating treatment, laser micro-texturing of the coating surface, and finally cover coating treatment, as shown in fig. 2 and 4.
When the texture surface is a plane in which the interface between the substrate and the bonding layer or the interface between the bonding layer and the functional coating or the interface between the substrate and the bonding layer is deviated towards the inside of the bonding layer, the special-shaped morphology is a composite morphology consisting of an annular micro-peak platform and an inclined saccular pit; the inclined bladder pockets are located at or near the center of the annular microfacet, as shown in FIG. 8; when the texture surface is a plane in which the interface surface between the bonding layer and the functional coating is deviated towards the inside of the functional coating, the special-shaped appearance is an inclined saccular pit.
The special-shaped morphology parameter is
Figure BDA0002385587730000071
Detailed description of the inventionThe number is as follows:
the appearance parameters of the annular micro-peak platform are as follows:
Figure BDA0002385587730000072
the morphology parameters of the inclined saccular pits are as follows:
Figure BDA0002385587730000073
wherein: mor is a special-shaped morphology parameter set; morringIs a feature parameter set of the annular micro-peak platform; morPurseA set of topographical parameters for the tilted bladder pocket; drIs the ring diameter of the annular microfacet; width is the peak platform section width of the annular micro-peak platform; height is the peak platform section height of the annular micro peak platform;
tau is the coefficient of the annular micro-peak table,
Figure BDA0002385587730000074
wherein the content of the first and second substances,
Doutera closed diameter of the inclined saccular pits; dmiddleThe diameter of the middle part of the inclined saccular pit is expanded, Depth is the Depth of the inclined saccular pit, α is the inclination of the inclined saccular pit, the inclination angle α of the inclined saccular pit is consistent with the thermal shock direction of the coating layer, d0Is the particle size of the coating, d0＝(1-OB)*d1+OB*d2；d1Particle size of the coating for the bonding layer; d2Is the particle size of the functional coating.
A processing method of the surface texture of the thermal barrier coating comprises the following steps:
as shown in FIG. 12, at the texture point on the texture surface, pulse Laser is fused by a large-energy Laser1Acting on a point to be textured along the normal of the texture surface; pulse Laser fused by broad area Laser1_wBreaking through the melting threshold of the texture surface material, carrying out heat treatment on the texture surface material, and forming a molten pool; by local Laser ablation of pulsed Laser1_aBreakthrough ofThe ablation threshold value of the materials in the molten pool is used for carrying out laser ablation processing on local points in the molten pool, and plasma generated by ablation generates eccentric recoil pressure on the molten pool to enable the molten mass to flow so as to form an annular micro-peak platform and an inclined micro-capsule pit;
as shown in FIG. 13, a rough machining Laser is used to ablate pulse Laser2_rThe special Laser head is utilized to guide Laser pulses to enter the inclined saccular pits at an angle of α degrees, a coaxial rotating motor of the special Laser head coaxially rotates to drive pulse Laser to rotate, meanwhile, a high-precision deflection unit carries out deflection scanning on tail end Laser, and a dynamic focusing module in the Laser carries out focus position compensation, so that rough machining Laser pulses Laser2_rScanning along the inner wall of the inclined saccular pit in a profiling way, and expanding the inclined saccular pit;
as shown in FIG. 14, the same machining method is used by a special Laser head, and the pulse Laser is ablated by rotating finish machining Laser2_fEntering the inclined saccular pit at an angle of α, scanning along the inner wall of the inclined saccular pit in a profiling mode, and carrying out thinning processing on the surface of the inclined saccular pit;
as shown in FIG. 15, the pulse Laser is polished by the rotating low-energy Laser using a special Laser head by the same processing method3The surface of the inclined saccular pit is fused and repaired by scanning along the inner wall of the inclined saccular pit at an angle of α, and the fused and repaired surface is used for forming a smooth hard shell.
The large-energy Laser fusing pulse is a combined Laser pulse formed by a wide-area Laser fusing pulse and a local Laser ablation pulse which are modulated in a time-space domain, and as shown in fig. 9, the Laser parameter is Laser1＝{Laser1_W，Laser1_aχ, ψ }, wherein:
Figure BDA0002385587730000081
Figure BDA0002385587730000082
Figure BDA0002385587730000083
wherein, Δ P ═ P2-P1；Dmor＝(dr+width)+(1-τ)*Douter；
The Laser ablation pulse is a pulse train of nanosecond/ultrafast Laser pulse combination and comprises a rough machining Laser ablation pulse Laser2_rAnd finishing the Laser ablation pulses Laser2_fAs shown in fig. 10, the specific parameters are as follows:
Figure BDA0002385587730000084
Figure BDA0002385587730000085
the low-energy Laser luster pulse Laser3The laser fusing pulse with small energy is shown in fig. 11, and the specific parameters are as follows:
Figure BDA0002385587730000086
wherein:
Laser1fusing pulse laser parameters for the high-energy laser; laser1_WPulse laser parameters for broad area laser consolidation; laser1_aThe parameters are local laser ablation pulse laser parameters; laser2_rRough machining laser ablation pulse laser parameters; laser2_rFine machining laser ablation pulse laser parameters; laser3The parameters of the small-energy laser polishing pulse laser are adopted; χ is the time domain difference proportion of the wide area laser fusing pulse and the local laser ablation pulse; psi is the spatial difference proportion of the wide area laser melting pulse and the local laser ablation pulse; PluseWidth is the pulse width of the laser pulse; p is the peak power of the laser pulse; p1Is the material melting threshold; p2Is the material ablation threshold; Δ P is the difference between the material ablation threshold and the material melting threshold; f is the laser pulse output frequency; m2A laser pulse mode; dfIs the spot diameter of the laser pulse; num is the number of nanosecond/ultrafast laser pulses in the laser ablation pulses; Δ t is the output time difference between the wide-area laser fusion pulse and the local laser ablation pulse; e is the spot center distance of the wide area laser melting pulse and the local laser ablation pulse; dmorThe diameter is a cross-scale concave-convex composite heterogeneous morphology diameter; PulseWidth1_wA pulse width that is a broad area laser consolidation pulse;
Figure BDA0002385587730000091
spot diameter for a broad area laser consolidation pulse;
Figure BDA0002385587730000092
is the spot diameter of the local laser ablation pulse.
As shown in fig. 16, the special laser head includes coaxial rotating electrical machines, special laser head casing, high accuracy light beam beat unit and focus module, special laser head casing coaxial arrangement is on coaxial rotating electrical machines, high accuracy light beam beat unit and focus module are installed in special laser head casing, outside mechanical motion mechanism drives the special laser head motion through the coaxial rotating electrical machines of centre gripping, outside fiber splice coaxial coupling is on coaxial rotating electrical machines, the output laser pulse of laser instrument passes through during optical fiber transmission to the special laser head, laser pulse acts on the material surface through focus module, high accuracy light beam beat unit, control system realizes the scanning formula processing of the three-dimensional curved surface inner wall of laser focus through the dynamic focus module in control coaxial rotating electrical machines rotation, high accuracy light beam deflection unit, the laser instrument.
The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.

Claims (8)

1. The surface texture of the thermal barrier coating is characterized in that an interface between a substrate and the coating is used as a texture surface, or a plane which is positioned on the interface and deviates into the coating is used as the texture surface, and a plurality of special-shaped appearances are regularly distributed on the texture surface.
2. The surface texture of the thermal barrier coating according to claim 1, characterized in that the interface between the substrate and the coating is in particular the interface between the substrate and the bond coat or the interface between the bond coat and the functional coating.
3. The surface texture of the thermal barrier coating according to claim 1, wherein the distance of the texture surface from the interface is Th, and the values thereof are as follows:
Figure FDA0002385587720000011
wherein: TH0＝(1-OB)*TH1+OB*TH2，layer0＝(1-OB)*layer1+OB*layer2；
When Th is 0, the texture surface is an interface; when Th is equal to Th1While the texture surface is located in the coating layer and at a distance Th from the interface1A plane of (a);
wherein: th is the distance of the texture surface offset interface;
OB is a surface texture object symbol, and when OB is 0, the interface between the substrate and the coating is the interface between the matrix and the bonding layer; when OB is 1, the interface between the substrate and the coating is the interface between the bonding layer and the functional coating;
Nasfis the internal texture coefficient of the coating; layer0The thickness of the single-layer coating layer after the single-layer coating particles are attached; layer1The thickness of the single-layer coating after the single-layer particles of the bonding layer are attached; layer2The thickness of the single-layer coating is the thickness of the single-layer coating after the single-layer particles of the functional coating are attached; TH0Is the total thickness of the coating; TH1The total thickness of the bonding layer; TH2The total thickness of the functional coating.
4. The surface texture of the thermal barrier coating according to claim 2,
when the texture surface is a plane in which the interface between the substrate and the bonding layer or the interface between the bonding layer and the functional coating or the interface between the substrate and the bonding layer is deviated inwards towards the bonding layer, the special-shaped morphology comprises an annular micro-peak platform and an inclined saccular pit; the inclined saccular pits are positioned at or near the center of the annular micro-peak platform;
when the texture surface is a plane in which the interface surface between the bonding layer and the functional coating is deviated towards the inside of the functional coating, the special-shaped appearance is an inclined saccular pit.
5. The surface texture of the thermal barrier coating according to claim 4, wherein the topographically profiled parameter is
Figure FDA0002385587720000012
Figure FDA0002385587720000013
The specific morphology parameters are as follows:
the appearance parameters of the annular micro-peak platform are as follows:
Figure FDA0002385587720000014
the morphology parameters of the inclined saccular pits are as follows:
Figure FDA0002385587720000021
wherein: mor is a special-shaped morphology parameter set; morringIs a feature parameter set of the annular micro-peak platform; morPurseA set of topographical parameters for the tilted bladder pocket; drIs the ring diameter of the annular microfacet; width is the peak platform section width of the annular micro-peak platform; height is the peak platform section height of the annular micro peak platform;
tau is the coefficient of the annular micro-peak table,
Figure FDA0002385587720000022
wherein D isouterA closed diameter of the inclined saccular pits; dmiddleThe diameter of the middle expanding part of the inclined saccular pit, Depth of the inclined saccular pit, α of the inclination of the inclined saccular pit, d0Is the particle size of the coating, d0＝(1-OB)*d1+OB*d2；d1Particle size of the coating for the bonding layer; d2Is the particle size of the functional coating.
6. The surface texture of the thermal barrier coating of claim 5, wherein the inclined angle α of the inclined saccular pits is consistent with the direction of thermal shock experienced by the coating.
7. A method of processing the surface texture of a thermal barrier coating according to any of claims 1 to 6, characterized in that it comprises the following steps:
at the texture point on the texture surface, pulse Laser is fused by high-energy Laser1Acting on a point to be textured along the normal of the texture surface; pulse Laser fused by broad area Laser1_wBreaking through the melting threshold of the texture surface material, carrying out heat treatment on the texture surface material, and forming a molten pool; by local Laser ablation of pulsed Laser1_aBreaking through the ablation threshold of materials in the molten pool, carrying out laser ablation processing on local points in the molten pool, and generating eccentric recoil pressure on the molten pool by plasma generated by ablation so as to enable the molten mass to flow and form an annular micro-peak platform and an inclined micro-capsule pit;
laser ablation of pulses by rotating rough machining2_rThe liquid enters the inclined saccular pit at an angle of α, and is scanned along the inner wall of the inclined saccular pit in a profiling way to expand the inclined saccular pit;
laser ablation of pulses by rotary fine machining2_fEntering the inclined saccular pit at an angle of α, scanning along the inner wall of the inclined saccular pit in a profiling mode, and carrying out thinning processing on the surface of the inclined saccular pit;
by rotating a low-energy Laser-lustrated pulse Laser3The surface of the inclined saccular pit is fused and repaired by scanning along the inner wall of the inclined saccular pit at an angle of α, and the fused and repaired surface is used for forming a smooth hard shell.
8. The method of manufacturing a surface texture of a thermal barrier coating according to claim 7,
the large-energy Laser fusing pulse is a combined Laser pulse formed by a wide-area Laser fusing pulse and a local Laser ablation pulse which are modulated in a time-space domain, and the Laser parameter is Laser1＝{Laser1_W,Laser1_aχ, ψ }, wherein:
Figure FDA0002385587720000031
Figure FDA0002385587720000032
Figure FDA0002385587720000033
wherein, Δ P ═ P2-P1；Dmor＝(dr+width)+(1-τ)*Douter；
The Laser ablation pulse is a pulse train of nanosecond/ultrafast Laser pulse combination and comprises a rough machining Laser ablation pulse Laser2_eAnd finishing the Laser ablation pulses Laser2_fThe specific parameters are as follows:
Figure FDA0002385587720000034
Figure FDA0002385587720000035
the low-energy Laser luster pulse Laser3The method is a small-energy laser fusing pulse, and the specific parameters are as follows:
Figure FDA0002385587720000036
wherein:
Laser1fusing pulse laser parameters for the high-energy laser; laser1_wPulse laser parameters for broad area laser consolidation; laser1_aThe parameters are local laser ablation pulse laser parameters; laser2_rRough machining laser ablation pulse laser parameters; laser2_rFine machining laser ablation pulse laser parameters; laser3The parameters of the small-energy laser polishing pulse laser are adopted; χ is the time domain difference proportion of the wide area laser fusing pulse and the local laser ablation pulse; psi is the spatial difference proportion of the wide area laser melting pulse and the local laser ablation pulse; PluseWidth is the pulse width of the laser pulse; p is the peak power of the laser pulse; p1Is the material melting threshold; p2Is the material ablation threshold; Δ P is the difference between the material ablation threshold and the material melting threshold; f is the laser pulse output frequency; m2A laser pulse mode; dfIs the spot diameter of the laser pulse; num is the number of nanosecond/ultrafast laser pulses in the laser ablation pulses; Δ t is the output time difference between the wide-area laser fusion pulse and the local laser ablation pulse; e is the spot center distance of the wide area laser melting pulse and the local laser ablation pulse; dmorThe diameter is a cross-scale concave-convex composite heterogeneous morphology diameter; PulseWidth1_wA pulse width that is a broad area laser consolidation pulse;
Figure FDA0002385587720000041
spot diameter for a broad area laser consolidation pulse;
Figure FDA0002385587720000042
is the spot diameter of the local laser ablation pulse.
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