CN113444996A - Preparation method of thermal barrier coating, thermal barrier coating and engine piston - Google Patents
Preparation method of thermal barrier coating, thermal barrier coating and engine piston Download PDFInfo
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- CN113444996A CN113444996A CN202110729291.8A CN202110729291A CN113444996A CN 113444996 A CN113444996 A CN 113444996A CN 202110729291 A CN202110729291 A CN 202110729291A CN 113444996 A CN113444996 A CN 113444996A
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- 239000012720 thermal barrier coating Substances 0.000 title claims abstract description 158
- 238000002360 preparation method Methods 0.000 title abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 86
- 238000005507 spraying Methods 0.000 claims abstract description 71
- 238000007750 plasma spraying Methods 0.000 claims abstract description 18
- 229910052751 metal Inorganic materials 0.000 claims description 83
- 239000002184 metal Substances 0.000 claims description 83
- 238000005524 ceramic coating Methods 0.000 claims description 74
- 230000007704 transition Effects 0.000 claims description 62
- 239000000843 powder Substances 0.000 claims description 56
- 229910001233 yttria-stabilized zirconia Inorganic materials 0.000 claims description 29
- 239000000956 alloy Substances 0.000 claims description 27
- 229910045601 alloy Inorganic materials 0.000 claims description 26
- 239000002245 particle Substances 0.000 claims description 26
- 239000000919 ceramic Substances 0.000 claims description 25
- 238000007788 roughening Methods 0.000 claims description 9
- 238000005488 sandblasting Methods 0.000 claims description 8
- 238000012216 screening Methods 0.000 claims description 7
- 238000000151 deposition Methods 0.000 claims description 6
- 239000003960 organic solvent Substances 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 38
- 238000010791 quenching Methods 0.000 abstract description 13
- 230000000171 quenching effect Effects 0.000 abstract description 13
- 230000007547 defect Effects 0.000 abstract description 12
- 230000008713 feedback mechanism Effects 0.000 abstract description 12
- 239000011229 interlayer Substances 0.000 abstract description 12
- 238000012544 monitoring process Methods 0.000 abstract description 12
- 239000010410 layer Substances 0.000 description 47
- 239000011248 coating agent Substances 0.000 description 30
- 238000000576 coating method Methods 0.000 description 30
- 239000000758 substrate Substances 0.000 description 17
- 230000002349 favourable effect Effects 0.000 description 12
- 230000002035 prolonged effect Effects 0.000 description 12
- 230000000694 effects Effects 0.000 description 11
- 230000002028 premature Effects 0.000 description 11
- 239000000463 material Substances 0.000 description 10
- 238000002844 melting Methods 0.000 description 8
- 239000011148 porous material Substances 0.000 description 8
- 239000011159 matrix material Substances 0.000 description 7
- 238000004901 spalling Methods 0.000 description 7
- 230000007797 corrosion Effects 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 230000035939 shock Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000007743 anodising Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/134—Plasma spraying
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
- C23C4/073—Metallic material containing MCrAl or MCrAlY alloys, where M is nickel, cobalt or iron, with or without non-metal elements
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
- C23C4/11—Oxides
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/30—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention relates to the field of thermal barrier coating preparation, in particular to a preparation method of a thermal barrier coating, the thermal barrier coating and an engine piston. The method aims to solve the problem that when the thermal barrier coating is prepared by a plasma spraying method, the thermal barrier coating on the surface of a part is easy to peel off and lose effectiveness. The invention provides a preparation method of a thermal barrier coating, the thermal barrier coating and an engine piston, wherein a real-time monitoring and feedback mechanism is established for the temperature of the surface to be sprayed of a part in the spraying process, so that the temperature of the surface to be sprayed of the part is always in a preset temperature range in the spraying process, the quenching internal stress and the interlayer internal stress of the thermal barrier coating are reduced, the defect that the thermal barrier coating on the surface of the part is easy to peel off and lose efficacy is overcome, and the purpose of prolonging the service life of the thermal barrier coating is further achieved.
Description
Technical Field
The invention relates to the field of thermal barrier coating preparation, in particular to a preparation method of a thermal barrier coating, the thermal barrier coating and an engine piston.
Background
The thermal barrier coating is a surface protection technology which utilizes the excellent high temperature resistance, corrosion resistance and low heat conduction performance of ceramic materials to compound the ceramic and the metal substrate in a coating mode, thereby improving the working temperature of the metal hot end component, enhancing the high temperature oxidation resistance of the hot end component, prolonging the service life of the hot end component and improving the efficiency of an engine.
The preparation method of the thermal barrier coating mainly comprises top hard anodic oxidation and plasma spraying. The top hard anodizing method is to place the piston in electrolyte prepared according to a certain proportion as an anode, so that a layer of thermal barrier ceramic coating with functions of corrosion prevention, heat insulation and the like is deposited on the surface of the piston, but the thermal insulation effect is limited, and the actual requirements cannot be met in application; plasma spraying is to ionize working gas by high-frequency voltage to generate plasma beams, then spraying powder is sent into the plasma beams, the powder is finally deposited on the surfaces of parts through a heating acceleration process, and the plasma spraying has the advantages of high efficiency and good heat insulation performance, so that the plasma spraying is more and more widely applied.
However, when the thermal barrier coating is prepared by the above plasma spraying method, the thermal barrier coating on the surface of the part is easy to peel off and fail.
Disclosure of Invention
The invention provides a preparation method of a thermal barrier coating, the thermal barrier coating and an engine piston, and aims to solve the problem that the thermal barrier coating on the surface of a part is easy to peel off and lose efficacy when the thermal barrier coating is prepared by a plasma spraying method.
In order to achieve the above object, in a first aspect, the present invention provides a method for preparing a thermal barrier coating, comprising:
pretreating the surface to be sprayed of the part;
acquiring the real-time temperature of the surface to be sprayed;
judging whether the real-time temperature is within a preset temperature range;
if so, preparing a thermal barrier coating on the surface to be sprayed; wherein the thermal barrier coating comprises a metal transition layer and a ceramic coating;
if not, adjusting the real-time temperature of the surface to be sprayed to be within the preset temperature range, and executing the second step of operation.
The preparation method of the thermal barrier coating provided by the invention comprises the following steps: pretreating the surface to be sprayed of the part; acquiring the real-time temperature of the surface to be sprayed; judging whether the real-time temperature is within a preset temperature range; if so, preparing a thermal barrier coating on the surface to be sprayed; if not, adjusting the real-time temperature of the surface to be sprayed to be within the preset temperature range, and executing the second step of operation. The method establishes a real-time monitoring and feedback mechanism for the temperature of the surface to be sprayed of the part in the spraying process, so that the temperature of the surface to be sprayed of the part is always within a preset temperature range in the spraying process, the quenching internal stress and the interlayer internal stress of the thermal barrier coating are reduced, the defect that the thermal barrier coating on the surface of the part is easy to peel off and lose efficacy is overcome, and the purpose of prolonging the service life of the thermal barrier coating is further achieved.
In the above method for preparing a thermal barrier coating, optionally, the step of preparing a thermal barrier coating on the surface to be sprayed specifically includes:
preparing a metal transition layer; depositing MCrAl alloy powder on the surface to be sprayed in a plasma spraying mode, and forming a metal transition layer; wherein, the alloy element M is at least one of Ni and Co.
The arrangement can ensure that the coating has good corrosion resistance and thermal shock resistance, is favorable for relieving the premature spalling failure of the ceramic coating and the metal matrix, and improves the service life of the thermal barrier coating.
Preparing a ceramic coating; and depositing the yttria-stabilized zirconia ceramic powder on the surface of the metal transition layer by adopting a plasma spraying mode to form a ceramic coating.
The arrangement can ensure that the coating has good physical and chemical stability, is favorable for relieving premature spallation failure of the ceramic coating and the metal matrix, and improves the service life of the thermal barrier coating.
In the above method for preparing a thermal barrier coating, optionally, the preset temperature range in the step of preparing the metal transition layer is the same as the preset temperature range in the step of preparing the ceramic coating. The control difficulty of reducing the temperature is facilitated.
Wherein the preset temperature range is 200-270 ℃. By the arrangement, a small amount of components such as moisture, grease and the like absorbed in the spraying process can be removed; the firm combination between the thermal barrier coating and the part to be sprayed can be realized, the premature spalling failure of the coating can be effectively relieved, and the service life of the thermal barrier coating is prolonged.
In the above method for preparing a thermal barrier coating, optionally, the step of pretreating the surface to be sprayed of the part specifically includes:
and cleaning the surface to be sprayed by adopting an organic solvent.
The arrangement is favorable for avoiding impurities between the surface to be sprayed and the thermal barrier coating and reducing the combination effect of the surface to be sprayed and the thermal barrier coating.
And roughening the cleaned surface to be sprayed.
The arrangement can ensure that the surface to be sprayed has certain roughness, is favorable for the heat barrier coating to be firmly grabbed with the surface to be sprayed in the spraying process and is not easy to peel off.
In the step of roughening the cleaned surface to be sprayed, the parameters of roughening are as follows: the sand blasting pressure is 2.5-3.5bar, the grain size of sand is 50-100 meshes, and the sand blasting distance is 120-180 mm; the Rz value range of the surface to be sprayed after coarsening treatment is 30-100 mu m; ra value ranges from 3.2 to 10 μm.
The arrangement can ensure that the coating and the surface to be sprayed have enough gripping force, and meanwhile, the internal stress of the coating cannot be obviously increased.
In the above method for preparing a thermal barrier coating, optionally, the surface to be sprayed is subjected to a preheating treatment before the step of obtaining the real-time temperature of the surface to be sprayed.
The arrangement is not only favorable for reducing the internal stress of the thermal barrier coating, but also favorable for removing impurities such as dust and the like introduced by coarsening on the surface to be sprayed, can obviously improve the combination quality of the ceramic coating and the surface to be sprayed, is favorable for relieving the problem that the thermal barrier coating is easy to peel off and lose efficacy prematurely, and improves the service life of the thermal barrier coating.
In the above method for preparing a thermal barrier coating, optionally, the step of preparing a metal transition layer specifically includes:
the thickness of the metal transition layer ranges from 0.15mm to 0.2 mm.
By the arrangement, uniform transition of material characteristics can be realized, a large difference between the thermal expansion coefficients of the ceramic coating and the metal matrix is avoided, and the condition that the ceramic coating and the metal matrix are easy to peel off and lose efficacy is effectively relieved, so that the service life of the thermal barrier coating is prolonged; and the excessive thickness of the metal transition layer can be avoided, and unnecessary spraying cost is increased.
The spraying parameters of the metal transition layer are as follows: the current is 570-630A, the main gas Ar is 42-48NLPM, and the auxiliary gas H211.5-13.5NLPM, powder feeding rate 28-32g/min, and spraying distance 120-140 mm.
The arrangement can improve the spraying quality of the formed metal transition layer.
In the above method for preparing a thermal barrier coating, before the step of preparing a metal transition layer, optionally, the method further comprises:
screening the MCrAl alloy powder to obtain MCrAl alloy powder with a first preset particle size; wherein the first predetermined particle size is in the range of 45-90 μm.
The arrangement can avoid the phenomenon of easy over-melting under the same spraying condition due to the over-small particle size, thereby causing more pores in the coating; the problem that the melting effect is poor under the same spraying condition due to the overlarge particle size, so that unmelted particles are formed in the coating can be avoided; the quality of the formed metal transition layer is improved, cracks are not generated at the positions of pores and/or unmelted particles in the using process, and the service life of the metal transition layer is further prolonged.
Before the step of preparing the ceramic coating, the method also comprises the following steps:
screening the yttria-stabilized zirconia ceramic powder to obtain yttria-stabilized zirconia ceramic powder with a second preset particle size; wherein the second predetermined particle size range is 45-75 μm.
The arrangement can avoid the phenomenon of easy over-melting under the same spraying condition due to the over-small particle size, thereby causing more pores in the coating; the problem that the melting effect is poor under the same spraying condition due to the overlarge particle size, so that unmelted particles are formed in the coating can be avoided; the quality of the formed ceramic coating is improved, cracks are not generated at the positions of pores and/or unmelted particles in the using process, and the service life of the ceramic coating is further prolonged.
In the above method for preparing a thermal barrier coating, optionally, the step of preparing a ceramic coating specifically includes:
the thickness of the ceramic coating ranges from 0.2 to 0.25 mm.
The spraying parameters of the ceramic coating are as follows: the current is 570-630A, the main gas Ar is 38-42NLPM, and the auxiliary gas H2Is 11-13NLPM, the powder feeding rate is 38-42g/min, and the spraying distance is 120-140 mm.
The arrangement can effectively relieve the loss of energy which is transmitted into the cooling system through the piston, and improve the specific power and the thermal efficiency of the diesel engine. Unnecessary spraying costs can also be avoided.
The spraying parameters of the ceramic coating are as follows: the current is 570-630A, the main gas Ar is 38-42NLPM, and the auxiliary gas H2Is 11-13NLPM, the powder feeding rate is 38-42g/min, and the spraying distance is 120-140 mm.
The arrangement can improve the spraying quality of the formed ceramic coating.
In a second aspect, the present invention provides a thermal barrier coating prepared by the above method, the thermal barrier coating comprising: the coating comprises a metal transition layer and a ceramic coating, wherein the ceramic coating is positioned on one side of the metal transition layer, which is far away from the surface to be sprayed.
The arrangement can realize uniform transition of material characteristics, and avoid great difference of thermal expansion coefficients between the ceramic coating and the metal substrate, so that the ceramic coating and the metal substrate are not easy to peel off and lose efficacy, and the service life of the thermal barrier coating is prolonged.
The metal transition layer is made of MCrAl alloy powder, and the ceramic coating is made of yttria-stabilized zirconia ceramic powder.
The arrangement can ensure that the metal transition layer has good corrosion resistance and thermal shock resistance, is favorable for relieving the premature spalling failure of the ceramic coating and the metal matrix, and prolongs the service life of the thermal barrier coating. The ceramic coating has good physical and chemical stability, is favorable for further relieving the premature spalling failure of the ceramic coating and the metal substrate, and improves the service life of the thermal barrier coating.
The invention provides a thermal barrier coating, which is prepared by the following method: pretreating the surface to be sprayed of the part; acquiring the real-time temperature of the surface to be sprayed; judging whether the real-time temperature is within a preset temperature range; if so, preparing a thermal barrier coating on the surface to be sprayed; if not, adjusting the real-time temperature of the surface to be sprayed to be within the preset temperature range, and executing the second step of operation. The thermal barrier coating establishes a real-time monitoring and feedback mechanism for the temperature of the surface to be sprayed of the part in the spraying process, so that the temperature of the surface to be sprayed of the part is always within a preset temperature range in the spraying process, the quenching internal stress and the interlayer internal stress of the thermal barrier coating are reduced, the defect that the thermal barrier coating on the surface of the part is easy to peel off and lose efficacy is overcome, and the purpose of prolonging the service life of the thermal barrier coating is further achieved.
In a third aspect, the present invention provides an engine piston having a surface provided with a thermal barrier coating prepared by the above method.
The invention provides an engine piston.A thermal barrier coating prepared by the following method is arranged on the surface of the engine piston; pretreating the surface to be sprayed of the part; acquiring the real-time temperature of the surface to be sprayed; judging whether the real-time temperature is within a preset temperature range; if so, preparing a thermal barrier coating on the surface to be sprayed; if not, adjusting the real-time temperature of the surface to be sprayed to be within the preset temperature range, and executing the second step of operation. The engine piston establishes a real-time monitoring and feedback mechanism for the temperature of the surface to be sprayed of the part in the spraying process, so that the temperature of the surface to be sprayed of the part is always in a preset temperature range in the spraying process, the quenching internal stress and the interlayer internal stress of the thermal barrier coating are reduced, the defect that the thermal barrier coating on the top of the piston is easy to peel off and lose efficacy is overcome, and the purpose of prolonging the service life of the thermal barrier coating is further achieved.
The construction of the present invention and other objects and advantages thereof will be more apparent from the following description of the preferred embodiments taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a method for preparing a thermal barrier coating according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a surface pretreatment of a surface to be sprayed of a part according to a method for preparing a thermal barrier coating according to an embodiment of the present invention;
FIG. 3 is a flowchart of a method for preparing a thermal barrier coating on a surface to be sprayed according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a thermal barrier coating provided in accordance with a second embodiment of the present invention;
fig. 5 is a schematic structural diagram of an engine piston according to a third embodiment of the present invention.
Description of reference numerals:
10-thermal barrier coating;
11-a metal transition layer;
12-a ceramic coating;
20-engine piston.
Detailed Description
Through years of research on the service performance of the diesel engine piston, the inventor finds that the thermal barrier coating material of the diesel engine piston adopts Yttria Stabilized Zirconia (YSZ) material, which has good physical and chemical stability, but the thermal expansion coefficient of the thermal barrier coating material is greatly different from that of a metal matrix, so that an alloy material is required to be used as a transition layer to enable the material characteristics to be uniformly transited. When the thermal barrier coating is prepared by the plasma spraying method, because the temperature change of the metal substrate is large and cannot be accurately controlled in the spraying process, large quenching internal stress is easily generated in the coating solidification process and large internal stress is generated among the layered structures, particularly in the shape abrupt change regions of parts such as the throat region of a piston, the edge corners and the like, the generated stress concentration phenomenon is more obvious, and the problem that the thermal barrier coating on the surface of the part is easy to peel off and lose efficacy is caused.
Based on the technical problem, the invention provides a preparation method of a thermal barrier coating, which comprises the following steps: pretreating the surface to be sprayed of the part; acquiring the real-time temperature of the surface to be sprayed; judging whether the real-time temperature is within a preset temperature range; if so, preparing a thermal barrier coating on the surface to be sprayed; if not, adjusting the real-time temperature of the surface to be sprayed to be within the preset temperature range, and executing the second step of operation. The method establishes a real-time monitoring and feedback mechanism for the temperature of the surface to be sprayed of the part in the spraying process, so that the temperature of the surface to be sprayed of the part is always within a preset temperature range in the spraying process, the quenching internal stress and the interlayer internal stress of the thermal barrier coating are reduced, the defect that the thermal barrier coating on the surface of the part is easy to peel off and lose efficacy is overcome, and the purpose of prolonging the service life of the thermal barrier coating is further achieved.
The invention provides a thermal barrier coating, which is prepared by the following method: pretreating the surface to be sprayed of the part; acquiring the real-time temperature of the surface to be sprayed; judging whether the real-time temperature is within a preset temperature range; if so, preparing a thermal barrier coating on the surface to be sprayed; if not, adjusting the real-time temperature of the surface to be sprayed to be within the preset temperature range, and executing the second step of operation. The thermal barrier coating establishes a real-time monitoring and feedback mechanism for the temperature of the surface to be sprayed of the part in the spraying process, so that the temperature of the surface to be sprayed of the part is always within a preset temperature range in the spraying process, the quenching internal stress and the interlayer internal stress of the thermal barrier coating are reduced, the defect that the thermal barrier coating on the surface of the part is easy to peel off and lose efficacy is overcome, and the purpose of prolonging the service life of the thermal barrier coating is further achieved.
The invention provides an engine piston, wherein a thermal barrier coating prepared by the following method is arranged on the surface of the engine piston; pretreating the surface to be sprayed of the part; acquiring the real-time temperature of the surface to be sprayed; judging whether the real-time temperature is within a preset temperature range; if so, preparing a thermal barrier coating on the surface to be sprayed; if not, adjusting the real-time temperature of the surface to be sprayed to be within the preset temperature range, and executing the second step of operation. The engine piston establishes a real-time monitoring and feedback mechanism for the temperature of the surface to be sprayed of the part in the spraying process, so that the temperature of the surface to be sprayed of the part is always in a preset temperature range in the spraying process, the quenching internal stress and the interlayer internal stress of the thermal barrier coating are reduced, the defect that the thermal barrier coating on the top of the piston is easy to peel off and lose efficacy is overcome, and the purpose of prolonging the service life of the thermal barrier coating is further achieved.
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example one
Fig. 1 is a flowchart of a method for preparing a thermal barrier coating according to an embodiment of the present invention. Fig. 2 is a flowchart of surface pretreatment of the surface to be sprayed of the part according to the preparation method of the thermal barrier coating provided by the embodiment of the invention. Fig. 3 is a flowchart of a method for preparing a thermal barrier coating on a surface to be sprayed according to an embodiment of the present invention.
Referring to fig. 1 to fig. 3, a method for preparing a thermal barrier coating according to an embodiment of the present invention includes:
and S1, preprocessing the surface to be sprayed of the part.
And S2, acquiring the real-time temperature of the surface to be sprayed.
And S3, judging whether the real-time temperature is within the preset temperature range.
If so, S4, preparing a thermal barrier coating on the surface to be sprayed; wherein the thermal barrier coating comprises a metal transition layer and a ceramic coating;
if not, S5, adjusting the real-time temperature of the surface to be sprayed to be within the preset temperature range, and executing S2.
The preparation method of the thermal barrier coating provided by the embodiment of the invention comprises the following steps: pretreating the surface to be sprayed of the part; acquiring the real-time temperature of the surface to be sprayed; judging whether the real-time temperature is within a preset temperature range; if so, preparing a thermal barrier coating on the surface to be sprayed; if not, adjusting the real-time temperature of the surface to be sprayed to be within the preset temperature range, and executing the second step of operation. The method establishes a real-time monitoring and feedback mechanism for the temperature of the surface to be sprayed of the part in the spraying process, so that the temperature of the surface to be sprayed of the part is always within a preset temperature range in the spraying process, the quenching internal stress and the interlayer internal stress of the thermal barrier coating are reduced, the defect that the thermal barrier coating on the surface of the part is easy to peel off and lose efficacy is overcome, and the purpose of prolonging the service life of the thermal barrier coating is further achieved.
It should be noted that, the real-time temperature of the surface to be sprayed may be obtained by a temperature measuring instrument, for example, an infrared temperature measuring instrument. Specifically, the infrared thermometer can be placed at a position 1m away from the surface of the part to be sprayed, and the infrared probe is aligned to the position near the surface of the part to be sprayed, so that the surface temperature of the part can be monitored in real time.
In the spraying process, the infrared thermometer transmits real-time temperature data of the surface to be sprayed of the part to the control system, the control system reads the real-time temperature data and judges the real-time temperature data, if the temperature reaches an upper threshold value of a preset temperature, the spraying system stops spraying operation and cools the part, and when the temperature of the part is reduced to a lower threshold value, the spraying system starts to work and the spraying operation continues. The real-time monitoring and feedback mechanism is established for the temperature of the surface to be sprayed of the part in the spraying process, so that the temperature of the surface to be sprayed of the part is always in the preset temperature range in the spraying process, the quenching internal stress and the interlayer internal stress of the thermal barrier coating are reduced, the stability of the coating quality is greatly improved, the defect that the thermal barrier coating on the surface of the part is easy to peel off and lose efficacy is overcome, and the purpose of prolonging the service life of the thermal barrier coating is further achieved.
Further, the step of preparing the thermal barrier coating on the surface to be sprayed specifically comprises:
s41, preparing a metal transition layer; depositing MCrAl alloy powder on the surface to be sprayed in a plasma spraying mode, and forming a metal transition layer; wherein, the alloy element M is at least one of Ni and Co.
It should be noted that, by preparing the metal transition layer on the surface of the metal substrate before preparing the ceramic coating, uniform transition of material characteristics can be realized, and the ceramic coating and the metal substrate are prevented from being easily peeled off and losing efficacy due to large difference of thermal expansion coefficients, so that the service life of the thermal barrier coating is prolonged.
The plasma spraying operation of the MCrAl alloy powder can be realized by plasma spraying equipment, and for example, a plasma spray gun with the model of METCO F4 can be adopted for realizing the spraying. In view of the fact that the working conditions of a part of metal matrixes (such as diesel engine pistons) are severe, the MCrAl alloy powder is selected to prepare the metal transition layer, so that the metal transition layer has good corrosion resistance and thermal shock resistance, the ceramic coating and the metal matrixes are favorably relieved from premature spalling failure, and the service life of the thermal barrier coating is prolonged. The alloy element M is at least one of Ni and Co, and may be selected according to application conditions, and the embodiment of the present invention is not limited herein. For example, the MCrAl alloy powder may be selected from the NiCrAl of METCO334 NS.
S42, preparing a ceramic coating; depositing yttria-stabilized zirconia (YSZ) ceramic powder on the surface of the metal transition layer by adopting a plasma spraying mode, and forming a ceramic coating.
It should be noted that by preparing the ceramic coating on the surface of the metal substrate (such as a diesel engine piston), the energy loss caused by the transmission of energy into a cooling system through the piston can be reduced, and the specific power and the thermal efficiency of the diesel engine can be improved.
Among them, the plasma spraying operation of yttria-stabilized zirconia (YSZ) ceramic powder can be realized by a plasma spraying apparatus, for example, a plasma spray gun of a type METCO F4 can be used for the spraying. According to the embodiment of the invention, the ceramic coating is prepared by selecting Yttria Stabilized Zirconia (YSZ) ceramic powder, so that the ceramic coating has good physical and chemical stability, the premature spallation failure of the ceramic coating and a metal substrate is relieved, and the service life of the thermal barrier coating is prolonged. The content ratio of the yttrium oxide to the zirconium oxide may be selected according to application conditions, and the embodiment of the present invention is not limited herein. In the example, the mole fraction of the yttrium oxide content can be 8%, and at the moment, the strength is high, the fracture toughness is good, the hardness is high, the elastic modulus is high, the linear expansion coefficient is similar to that of metal, the wear resistance is good, and the material is non-magnetic and is resistant to medium corrosion. Specifically, the yttria and zirconia ceramic powder can be selected from 8% Yttria Stabilized Zirconia (YSZ) ceramic powder with the model of METCO 204B-NS.
Further, the preset temperature range in the step of preparing the metal transition layer is the same as the preset temperature range in the step of preparing the ceramic coating; wherein the preset temperature range is 200-270 ℃.
It should be noted that the preset temperature range for preparing the metal transition layer and the preset temperature range for preparing the ceramic coating are set to be the same, which is beneficial to reducing the difficulty of controlling the temperature.
The preset temperature range is 200-270 ℃, wherein the lower threshold of the preset temperature is 200 ℃, and the upper threshold of the preset temperature is 270 ℃. When the lower threshold value of the preset temperature is lower than 200 ℃, the removal of a small amount of components such as water, grease and the like absorbed in the spraying process is not facilitated; when the upper threshold value is higher than 270 ℃, the combination between the thermal barrier coating and the part to be sprayed is not firm, the premature spalling failure of the coating is easily caused, and the service life of the thermal barrier coating is prolonged.
Further, the step of pretreating the surface to be sprayed of the part specifically includes:
and S11, cleaning the surface to be sprayed by using an organic solvent.
In the step of cleaning the surface to be sprayed by adopting the organic solvent, the surface to be sprayed is cleaned, so that impurities between the surface to be sprayed and the thermal barrier coating are avoided, and the combination effect of the surface to be sprayed and the thermal barrier coating is reduced. The organic solvent may be alcohol or acetone, and a user may select the organic solvent according to an application condition, which is not limited herein.
And S12, roughening the cleaned surface to be sprayed.
In the step of roughening the cleaned surface to be sprayed, the roughened surface to be sprayed is cleaned, so that the surface to be sprayed has certain roughness, the heat barrier coating and the surface to be sprayed are firmly held in the spraying process, and the surface to be sprayed is not easy to peel off.
The roughening treatment may be sand blasting, shot blasting, power tool grinding, hand grinding, or the like. For example, sand blasting coarsening can be adopted, and the parameters can be as follows: the sand blasting pressure is 2.5-3.5bar, the grain size of sand is 50-100 meshes, and the sand blasting distance is 120-180 mm; the Rz value range of the surface to be sprayed after coarsening treatment is 30-100 mu m; ra value ranges from 3.2 to 10 μm. The Rz value of the surface to be sprayed is in the range of 30-100 mu m; the Ra value is 3.2-10 μm, which can ensure that the coating and the surface to be sprayed have enough gripping force and can not obviously increase the internal stress of the coating. An excessively small roughness value results in insufficient holding power, while an excessively large roughness value results in an uneven coating thickness and a large internal stress in the coating.
Further, before the step of obtaining the real-time temperature of the surface to be sprayed, the surface to be sprayed is subjected to a preheating treatment.
It should be noted that, by performing the preheating treatment on the surface to be sprayed before obtaining the real-time temperature of the surface to be sprayed, not only is the internal stress of the thermal barrier coating favorably reduced, but also impurities such as dust and the like introduced by coarsening on the surface to be sprayed are favorably removed, the bonding quality of the ceramic coating and the surface to be sprayed can be remarkably improved, the problem that the thermal barrier coating is prone to premature spalling failure is relieved, and the service life of the thermal barrier coating is prolonged.
Further, in the step of preparing the metal transition layer, the method specifically comprises the following steps:
the thickness of the metal transition layer ranges from 0.15mm to 0.2 mm.
It should be noted that the thickness range of the metal transition layer is between 0.15mm and 0.2mm, wherein the thickness of the metal transition layer may be 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, etc., when the thickness of the metal transition layer is less than 0.15mm, it is difficult to achieve uniform transition of material characteristics, which results in a difference in thermal expansion coefficients between the ceramic coating and the metal substrate being still large, and the situation that the ceramic coating and the metal substrate are easy to peel off and fail cannot be effectively alleviated, thereby resulting in that the service life of the thermal barrier coating cannot be significantly improved; when the thickness of the metal transition layer is more than 0.2mm, unnecessary spraying cost is increased, and the stroke of a metal substrate (such as a diesel engine piston) is limited, so that the using effect of the diesel engine piston is influenced.
Wherein, the spraying parameters of the metal transition layer are as follows: the current is 570-630A, the main gas Ar is 42-48NLPM, and the auxiliary gas H211.5-13.5NLPM, powder feeding rate 28-32g/min, and spraying distance 120-140 mm. Through the arrangement, the spraying quality of the formed metal transition layer can be improved.
Further, before the step of preparing the metal transition layer, the method further comprises the following steps:
screening the MCrAl alloy powder to obtain MCrAl alloy powder with a first preset particle size; wherein the first predetermined particle size is in the range of 45-90 μm.
It is noted that the grain size distribution of the MCrAl alloy powder is of great importance for the quality of the metal transition layer, and the MCrAl alloy powder with grain size of 45-90 μm is obtained by screening the MCrAl alloy powder and spraying. Wherein the grain diameter of the MCrAl alloy powder can be 45 mu m, 55 mu m, 65 mu m, 75 mu m, 85 mu m, 90 mu m and the like, and when the grain diameter of the MCrAl alloy powder is less than 45 mu m, the phenomenon of over-melting is easy to occur under the same spraying condition, thereby leading to more pores in the coating; when the grain size of the MCrAl alloy powder is larger than 90 mu m, the melting effect is poor under the same spraying condition, so that non-melted grains are formed in the coating; the two conditions are not favorable for the quality of the formed metal transition layer, and cracks are easily generated at pores and/or unmelted particles during the use process, so that the metal transition layer fails in advance.
Further, before the step of preparing the ceramic coating, the method further comprises the following steps:
screening the yttria-stabilized zirconia ceramic powder to obtain yttria-stabilized zirconia ceramic powder with a second preset particle size; wherein the second predetermined particle size range is 45-75 μm.
It should be noted that the particle size distribution of the yttria-stabilized zirconia ceramic powder is important for the quality of the ceramic coating, and the yttria-stabilized zirconia ceramic powder with a particle size of 45-75 μm is obtained by sieving the yttria-stabilized zirconia ceramic powder and then spraying the yttria-stabilized zirconia ceramic powder. Wherein the grain size of the yttria-stabilized zirconia ceramic powder can be 45 μm, 55 μm, 65 μm, 75 μm and the like, and when the grain size of the yttria-stabilized zirconia ceramic powder is less than 45 μm, the over-melting phenomenon is easy to occur under the same spraying condition, so that more pores are generated in the coating; when the particle size of the yttria-stabilized zirconia ceramic powder is larger than 75 μm, the melting effect is poor under the same spraying condition, so that unmelted particles are formed in the coating; both of the above cases are not favorable for the quality of the formed ceramic coating, and cracks are easily generated at the pores and/or the unmelted particles during the use process, thereby causing early failure of the ceramic coating.
Further, in the step of preparing the ceramic coating, the method specifically comprises the following steps:
the thickness of the ceramic coating ranges from 0.2 to 0.25 mm.
The spraying parameters of the ceramic coating are as follows: the current is 570-630A, the main gas Ar is 38-42NLPM, and the auxiliary gas H2Is 11-13NLPM, the powder feeding rate is 38-42g/min, and the spraying distance is 120-140 mm.
It should be noted that the thickness of the ceramic coating ranges from 0.2 to 0.25mm, wherein the thickness of the ceramic coating may be 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, etc., and when the thickness of the ceramic coating prepared on the surface of the metal substrate (e.g., a diesel engine piston) is less than 0.2mm, it is difficult to effectively alleviate the loss of energy transmitted into the cooling system through the piston, thereby being disadvantageous to improve the specific power and thermal efficiency of the diesel engine. When the thickness of the ceramic coating is more than 0.25mm, unnecessary spraying cost is increased, and the stroke of a metal substrate (such as a diesel engine piston) is limited, so that the using effect of the diesel engine piston is influenced.
Wherein the spraying parameters of the ceramic coating are as follows: the current is 570-630A, the main gas Ar is 38-42NLPM, and the auxiliary gas H2Is 11-13NLPM, the powder feeding rate is 38-42g/min, and the spraying distance is 120-140 mm. The spraying quality of the formed ceramic coating can be improved through the arrangement.
It should be noted that, through experimental tests, it is found that: by the preparation method of the thermal barrier coating provided by the embodiment of the invention, the thickness range of the prepared coating is 0.35-0.45mm, the uniformity of the coating thickness is good, and the repeatability is good; the thermal conductivity coefficient of the prepared thermal barrier coating is 0.95W/m.K at 1000 ℃, so that the thermal shock resistance of the coating is improved by about 10%. The real-time monitoring and feedback mechanism is established for the temperature of the surface to be sprayed of the part in the spraying process, so that the temperature of the surface to be sprayed of the part is always in the preset temperature range in the spraying process, the uniformity of the metallographic phase of the coating can be ensured, the heat conductivity coefficient of the coating is reduced, the quenching internal stress and the interlayer internal stress of the thermal barrier coating can be reduced, the stability of the quality of the coating is greatly improved, the defect that the thermal barrier coating on the surface of the part is easy to peel off and lose efficacy is overcome, and the service life of the thermal barrier coating is prolonged.
Example two
Fig. 4 is a schematic structural diagram of a thermal barrier coating according to a second embodiment of the present invention.
Referring to fig. 4, a thermal barrier coating provided by the second embodiment of the present invention is prepared by the method for preparing a thermal barrier coating according to the first embodiment, and the thermal barrier coating 10 includes: a metal transition layer 11 and a ceramic coating 12, wherein the ceramic coating 12 is positioned on the side of the metal transition layer 11 facing away from the surface to be sprayed.
It should be noted that, by preparing the metal transition layer 11 between the surface to be sprayed of the metal substrate and the ceramic coating 12, uniform transition of material characteristics can be achieved, and it is avoided that the ceramic coating 12 and the metal substrate are prone to peeling and failure due to a large difference in thermal expansion coefficient, thereby reducing the service life of the thermal barrier coating 10.
The metallic transition layer 11 is made of MCrAl alloy powder and the ceramic coating 12 is made of yttria stabilised zirconia ceramic powder.
It should be noted that the embodiment of the invention selects the MCrAl alloy powder to prepare the metal transition layer, so that the metal transition layer has good corrosion resistance and thermal shock resistance, is favorable for relieving premature spallation failure of the ceramic coating and the metal matrix, and prolongs the service life of the thermal barrier coating. The ceramic coating is prepared by selecting Yttria Stabilized Zirconia (YSZ) ceramic powder, so that the ceramic coating has good physical and chemical stability, the premature spallation failure of the ceramic coating and a metal substrate is further relieved, and the service life of the thermal barrier coating is prolonged.
The second embodiment of the invention provides a thermal barrier coating, which is prepared by the following method: pretreating the surface to be sprayed of the part; acquiring the real-time temperature of the surface to be sprayed; judging whether the real-time temperature is within a preset temperature range; if so, preparing a thermal barrier coating on the surface to be sprayed; if not, adjusting the real-time temperature of the surface to be sprayed to be within the preset temperature range, and executing the second step of operation. The thermal barrier coating establishes a real-time monitoring and feedback mechanism for the temperature of the surface to be sprayed of the part in the spraying process, so that the temperature of the surface to be sprayed of the part is always within a preset temperature range in the spraying process, the quenching internal stress and the interlayer internal stress of the thermal barrier coating are reduced, the defect that the thermal barrier coating on the surface of the part is easy to peel off and lose efficacy is overcome, and the purpose of prolonging the service life of the thermal barrier coating is further achieved.
Other technical features are the same as those of the first embodiment and can achieve the same technical effects, and are not described in detail herein.
EXAMPLE III
Fig. 5 is a schematic structural diagram of an engine piston according to a third embodiment of the present invention.
Referring to fig. 5, the engine piston provided by the third embodiment of the invention is provided with the thermal barrier coating 10 prepared in the second embodiment on the surface of the engine piston 20.
The invention provides an engine piston, wherein a thermal barrier coating prepared by the following method is arranged on the surface of the engine piston; pretreating the surface to be sprayed of the part; acquiring the real-time temperature of the surface to be sprayed; judging whether the real-time temperature is within a preset temperature range; if so, preparing a thermal barrier coating on the surface to be sprayed; if not, adjusting the real-time temperature of the surface to be sprayed to be within the preset temperature range, and executing the second step of operation. The engine piston establishes a real-time monitoring and feedback mechanism for the temperature of the surface to be sprayed of the part in the spraying process, so that the temperature of the surface to be sprayed of the part is always in a preset temperature range in the spraying process, the quenching internal stress and the interlayer internal stress of the thermal barrier coating are reduced, the defect that the thermal barrier coating on the top of the piston is easy to peel off and lose efficacy is overcome, and the purpose of prolonging the service life of the thermal barrier coating is further achieved.
Other technical features are the same as those of the embodiment and can achieve the same technical effects, and are not described in detail herein.
In the description of the embodiments of the present invention, it should be understood that the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, an indirect connection through intervening media, a connection between two elements, or an interaction between two elements, unless expressly stated or limited otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. The terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically stated otherwise.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method of preparing a thermal barrier coating, comprising:
pretreating the surface to be sprayed of the part;
acquiring the real-time temperature of the surface to be sprayed;
judging whether the real-time temperature is within a preset temperature range;
if so, preparing a thermal barrier coating on the surface to be sprayed; wherein the thermal barrier coating comprises a metal transition layer and a ceramic coating;
if not, adjusting the real-time temperature of the surface to be sprayed to be within the preset temperature range, and executing the second step of operation.
2. The method for preparing a thermal barrier coating according to claim 1, wherein the step of preparing a thermal barrier coating on the surface to be sprayed specifically comprises:
preparing the metal transition layer; depositing MCrAl alloy powder on the surface to be sprayed in a plasma spraying mode, and forming the metal transition layer; wherein, the alloy element M is at least one of Ni and Co;
preparing the ceramic coating; and depositing yttria-stabilized zirconia ceramic powder on the surface of the metal transition layer by adopting a plasma spraying mode, and forming the ceramic coating.
3. The method for preparing a thermal barrier coating according to claim 2, wherein the predetermined temperature range in the step of preparing the metal transition layer is the same as the predetermined temperature range in the step of preparing the ceramic coating;
wherein the preset temperature range is 200-270 ℃.
4. The method for preparing a thermal barrier coating according to claim 2, wherein the step of pretreating the surface to be sprayed of the part comprises:
cleaning the surface to be sprayed by adopting an organic solvent;
carrying out roughening treatment on the cleaned surface to be sprayed;
wherein, in the step of roughening the cleaned surface to be sprayed, the parameters of roughening are as follows: the sand blasting pressure is 2.5-3.5bar, the grain size of sand is 50-100 meshes, and the sand blasting distance is 120-180 mm; the Rz value range of the surface to be sprayed after coarsening treatment is 30-100 mu m; ra value ranges from 3.2 to 10 μm.
5. The method for producing a thermal barrier coating according to claim 3, characterized in that the surface to be sprayed is subjected to a pre-heating treatment before the step of obtaining the real-time temperature of the surface to be sprayed.
6. The method for preparing a thermal barrier coating according to claim 4, wherein the step of preparing the metal transition layer specifically comprises:
the thickness range of the metal transition layer is 0.15-0.2 mm;
the spraying parameters of the metal transition layer are as follows: the current is 570-630A, the main gas Ar is 42-48NLPM, and the auxiliary gas H211.5-13.5NLPM, powder feeding rate 28-32g/min, and spraying distance 120-140 mm.
7. The method for preparing a thermal barrier coating according to claim 3, further comprising, before the step of preparing the metal transition layer:
screening the MCrAl alloy powder to obtain MCrAl alloy powder with a first preset particle size;
wherein the range of the first preset particle size is 45-90 μm;
before the step of preparing the ceramic coating, further comprising:
screening the yttria-stabilized zirconia ceramic powder to obtain yttria-stabilized zirconia ceramic powder with a second preset particle size;
wherein the second predetermined particle size range is 45-75 μm.
8. The method for preparing a thermal barrier coating according to claim 6, comprising in particular, in the step of preparing the ceramic coating:
the thickness range of the ceramic coating is 0.2-0.25 mm;
the spraying parameters of the ceramic coating are as follows: the current is 570-630A, the main gas Ar is 38-42NLPM, and the auxiliary gas H2Is 11-13NLPM, the powder feeding rate is 38-42g/min, and the spraying distance is 120-140 mm.
9. A thermal barrier coating prepared by the method for preparing a thermal barrier coating according to any one of claims 1 to 8, said thermal barrier coating comprising: the ceramic coating is positioned on one side of the metal transition layer, which is far away from the surface to be sprayed;
the metal transition layer is made of MCrAl alloy powder, and the ceramic coating is made of yttria-stabilized zirconia ceramic powder.
10. An engine piston characterized in that its surface is provided with a thermal barrier coating as claimed in claim 9.
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| CN114215623A (en) * | 2021-12-20 | 2022-03-22 | 重庆三爱海陵实业有限责任公司 | Coated valve for internal combustion engine and method for manufacturing same |
| CN114774826A (en) * | 2022-04-20 | 2022-07-22 | 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 |
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| CN114107874A (en) * | 2022-01-27 | 2022-03-01 | 潍柴动力股份有限公司 | Heat-insulating piston and preparation method thereof |
| CN114774826A (en) * | 2022-04-20 | 2022-07-22 | 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 |
| 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 |
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