CN112779491B - Flame spraying construction method for micro-melting ceramic coating - Google Patents
Flame spraying construction method for micro-melting ceramic coating Download PDFInfo
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- CN112779491B CN112779491B CN202011617397.0A CN202011617397A CN112779491B CN 112779491 B CN112779491 B CN 112779491B CN 202011617397 A CN202011617397 A CN 202011617397A CN 112779491 B CN112779491 B CN 112779491B
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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
- C23C4/129—Flame spraying
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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
- C23C4/04—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
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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
- C23C4/04—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
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Abstract
The invention relates to a flame spraying construction method of a micro-melting ceramic coating, which comprises the following steps: step 1) pretreatment: cleaning the crack part of the undercarriage to remove surface impurities; step 2) spraying and repairing the base material: spraying a layer of aluminum alloy powder with the same material as that of the landing gear on the surface of the crack part of the landing gear treated in the step 1) by using supersonic flame spraying equipment; step 3), spraying micro-melting ceramic: spraying micro-melting ceramic powder on the surface of the crack part of the landing gear treated in the step 2) by using supersonic flame spraying equipment; step 4), deposition repair: repeating the spraying operation of the step 2) and the step 3) for 2-4 times, and then performing the operation of the step 2) again; step 5) post-treatment: polishing the spraying and repairing part of the repaired undercarriage obtained in the step 4) to finish repairing. The invention can effectively repair the fatigue crack on the surface of the landing gear component, the repaired additive is not easy to fall off, and the crack initiation life is long.
Description
Technical Field
The invention relates to the technical field of metal surface treatment, in particular to a flame spraying construction method of a micro-melting ceramic coating.
Background
Landing gear is an attachment device for supporting an aircraft for ground (surface) movement during takeoff and landing or ground (surface) taxiing on the lower portion of the aircraft. The landing gear device is an important bearing and maneuvering part of the aircraft, and plays an extremely important role in the safe taking-off and landing process of the aircraft. The landing gear is a support system necessary for taking off, landing, running, ground moving and parking of the airplane, is one of main parts of the airplane, and the quality of the performance of the landing gear is directly related to the use safety of the airplane.
Modern aircraft's volume is bigger and bigger, and the dead weight is also heavier and heavier, and payload is also promoting constantly. For example, the Boeing 747-8 passenger plane produced by Boeing company has the empty weight of 185 tons and the maximum takeoff weight of more than 435 tons; the air weight of European A380 type passenger plane reaches 277 tons, and the maximum takeoff weight is above 575 tons. Therefore, the load required to be borne by the landing gear is higher and higher, and when the landing gear is actually used, fatigue cracks are generated due to the impact of taking off and landing of the airplane, so that the use safety of the airplane is seriously affected, and if the landing gear cannot be timely treated or is improperly treated, the airplane is easily damaged and people die.
The existing method for treating the cracks of the undercarriage generally adopts a spraying technology to perform additive life-prolonging repair, namely, a layer of additive coating is sprayed on the surfaces of the cracks of the undercarriage to repair the undercarriage. At present, the spraying modes mainly adopted include supersonic flame spraying, plasma spraying, electric arc spraying, supersonic cold spraying, laser cladding and the like, and metal materials are generally adopted as repairing materials. However, the existing repairing technology has poor effect on repairing the undercarriage, and has the problems of short crack initiation life, easy falling of additive materials and the like.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a flame spraying construction method for a micro-melting ceramic coating, which can effectively repair fatigue cracks on the surface of a landing gear component, the repaired additive is not easy to fall off, the crack initiation life is long, no spraying hole is generated, and the strength and the toughness can meet the performance requirements of the landing gear.
The technical scheme for solving the technical problems is as follows: a flame spraying construction method of a micro-melting ceramic coating comprises the following steps:
step 1) pretreatment: cleaning the crack part of the undercarriage to remove surface impurities;
step 2) spraying and repairing the base material: spraying a layer of aluminum alloy powder which is the same as the material of the landing gear on the surface of the crack part of the landing gear treated in the step 1) by using supersonic flame spraying equipment, wherein the pressure of oxygen, propane and nitrogen is 0.65-0.85 MPa, 0.50-0.65 MPa and 0.85-1.05 MPa respectively, and the oxygen flow is 220-240L/min;
step 3), spraying micro-melting ceramic: spraying micro-melting ceramic powder on the surface of the crack part of the landing gear treated in the step 2) by using supersonic flame spraying equipment, wherein the pressure of oxygen, propane and nitrogen is 0.45-0.65 MPa, 0.30-0.45 MPa and 0.50-0.70 MPa respectively, and the oxygen flow is 180-200L/min;
step 4), deposition repair: repeating the spraying operation of the step 2) and the step 3) for 2-4 times, and then performing the operation of the step 2) again;
step 5) post-treatment: polishing the spraying repair part of the repaired undercarriage obtained in the step 4) to finish the repair.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, in the step 1), 75% alcohol is selected for cleaning, and air drying is carried out after cleaning.
Further, in the step 2), the granularity of the aluminum alloy powder is 5-50 μm.
Further, in the step 2), the spraying thickness of the aluminum alloy powder is 1-3 mm.
Further, in the step 3), the particle size of the micro-melting ceramic powder is 2-20 μm.
Further, in the step 3), the micro-melting ceramic powder is a mixture of alumina ceramic powder and glass powder, and the volume ratio of the alumina ceramic powder to the glass powder is 1.6-1.8.
Further, in the step 3), the spraying thickness of the micro-melting ceramic powder is 1-2 mm.
Further, in the step 3), the spraying temperature is controlled to be 550-580 ℃.
Further, in the step 4), the spraying operation of the step 2) and the step 3) is repeated 3 times.
Further, in the step 5), before the polishing treatment, the landing gear needs to be subjected to vibration aging stress relief treatment.
The beneficial effects of the invention are: according to the invention, the landing gear cracks are repaired by combining flame spraying homogeneous additive and micro-melting ceramic, and spraying operation is alternately carried out, so that micro-melting ceramic powder and a metal base material are perfectly fused to form a special and compact repair coating, the bonding with the landing gear surface is firm, the landing gear is not easy to fall off, the overall strength and the anti-cracking performance are good, the crack initiation life of the repaired additive part is long, the porosity is extremely low, and the service life of the repaired landing gear is obviously prolonged; the method has the advantages of simple process, simple and easily obtained raw materials and low overall repair cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a photograph of a repaired product of example 1 of the present invention;
fig. 2 is a photograph of a repaired product according to example 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "inner", "outer", etc. indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally placed when the products of the present invention are used, and are only used for convenience of description and simplification of the description, but do not indicate or imply that the devices or elements referred to must have specific orientations, be constructed in specific orientations, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention designs a flame spraying construction method of a micro-melting ceramic coating, which comprises the following steps:
step 1) pretreatment: cleaning the crack part of the undercarriage to remove surface impurities;
step 2) spraying and repairing the base material: spraying a layer of aluminum alloy powder with the same material as that of the landing gear on the surface of the crack part of the landing gear treated in the step 1) by using supersonic flame spraying equipment, wherein the spraying parameters of the oxygen, propane and nitrogen pressure of 0.65-0.85 MPa, 0.50-0.65 MPa and 0.85-1.05 MPa and the oxygen flow of 220-240L/min are adopted;
step 3), spraying micro-melting ceramic: spraying micro-melting ceramic powder on the surface of the crack part of the landing gear treated in the step 2) by using supersonic flame spraying equipment, wherein the pressure of oxygen, propane and nitrogen is 0.45-0.65 MPa, 0.30-0.45 MPa and 0.50-0.70 MPa respectively, and the oxygen flow is 180-200L/min;
step 4), deposition repair: repeating the spraying operation of the step 2) and the step 3) for 2-4 times, and then performing the operation of the step 2) again;
step 5) post-treatment: polishing the spraying and repairing part of the repaired undercarriage obtained in the step 4) to finish repairing.
At present, for repairing the landing gear, a homogeneous material repairing mode is basically adopted in the field, a supersonic spraying technology is mainly adopted, and cold spraying or flame spraying is more applied. Mainly based on the factor that homogeneous materials are combined more firmly, and the consideration of avoiding the coating from falling off rarely adopts heterogeneous materials. Even if a heterogeneous material is adopted, a metal material is basically adopted, and the application of a non-metal material is extremely low.
The supersonic spraying effect is excellent, the supersonic spraying method is applied to repair of parts such as aircraft landing gears, and based on the characteristic of the supersonic spraying, the sprayed material powder is required to bombard and attach to the surface of a base material to be repaired at a supersonic speed. The undercarriage generally adopts super high strength aluminum alloy material, if select for use the texture lighter increase material, the spraying of hardly accomplishing in theory is attached, and during the spraying, a large amount of increase material powder can collide the substrate surface after rebound or drop.
The inventor discovers that when the undercarriage repairing layer repaired by the prior art is researched, the additive coating is sprayed by adopting a metal material, so that pores are easily generated in the additive coating, and although the spraying is uniform, the additive powder is continuously bombarded in the spraying process to form the technical effect similar to that of a rammed coating. However, by testing the fatigue performance of the additive, after analysis and research on the crack surface of the tested fatigue crack, a plurality of fine pores are found in the coating. The presence of these pores has a large impact on both the adhesion strength of the additive and the crack initiation life.
Based on the method, the inventor designs the invention, adopts a mode of combining micro-melting ceramic spraying and homogeneous additive spraying, and the homogeneous additive spraying and the micro-melting ceramic spraying are alternately carried out, so that the beneficial effect of the original supersonic spraying is kept, the characteristics of the supersonic spraying are fully utilized, the micro-melting ceramic is added into the coating by the reinforcing agent and the filling agent, the void ratio of the coating is greatly reduced, and the adhesion strength and the crack initiation life of the coating are obviously improved.
The method utilizes the designed synergistic effect of the operation steps 2), 3) and 4), reduces the pores, and utilizes the characteristic of supersonic spraying of additive powder to bombard, tamp and fuse the micro-melting ceramic powder into the homogeneous additive to form the effect similar to dispersion strengthening, so that the strength is improved.
In order to ensure the spraying effect, in a preferred embodiment of the present invention, in step 1), 75% alcohol is selected for cleaning and scrubbing, and then air-drying is performed after scrubbing.
In a more preferred embodiment of the present invention, in the step 2), the aluminum alloy powder has a particle size of 5 to 50 μm.
In a more preferred embodiment of the present invention, in the step 2), the thickness of the aluminum alloy powder sprayed is 1 to 3mm.
The method comprises the steps of firstly spraying a layer of base material, and adopting a certain spraying thickness, so that the coating and the repairing surface of the undercarriage can be combined to form homogeneous metal combination, the complete crack repairing can be effectively ensured, and the adhesion strength of the coating is improved.
In a more preferred embodiment of the present invention, in the step 3), the particle size of the micro-fused ceramic powder is 2 to 20 μm.
In a more preferred embodiment of the present invention, in the step 3), the micro-melting ceramic powder is a mixture of alumina ceramic powder and glass powder, and the volume ratio of the alumina ceramic powder to the glass powder is 1.6 to 1.8.
In a more preferred embodiment of the present invention, in the step 3), the spray thickness of the micro-melting ceramic powder is 1 to 2mm.
In a more preferred embodiment of the present invention, in the step 3), the spraying temperature is controlled to be 550 to 580 ℃.
The specific micro-melting ceramic is adopted and sprayed according to specific process parameters, so that the micro-melting ceramic layer can be well attached to the surface of the metal layer, and a better foundation is laid for subsequent operation. The ceramic powder with the smaller granularity can be easily fused with the metal layer to form a dispersion strengthening structure. And the spraying thickness of accurate control micro-melting ceramic layer can accurately control the addition of ceramic powder, avoids the coating brittleness reinforcing, and leads to the reduction of crack initiation life-span.
In the present invention, the particle size of the micro-fused ceramic powder is smaller than that of the aluminum alloy powder. The spraying thickness of the micro-melting ceramic layer is less than or equal to that of the aluminum alloy spraying layer. The present invention can be practiced within the above particle size and coating thickness parameters when the above conditions are met.
In a more preferred embodiment of the present invention, in the step 4), the spraying operations of the steps 2) and 3) are repeated 3 times.
The inventor tests that when the method is repeated for 3 times, the porosity can be controlled within 0.8%, and the ceramic powder can be uniformly mixed into the additive, so that the dispersion strengthening effect is good.
It should be noted that the spraying operation of step 2) and step 3) needs to be repeated at least 2 times to obtain a better crack initiation life; at 4 repetitions, the crack initiation life was not increased relative to 3 repetitions.
In a more preferred embodiment of the present invention, in step 5), before the polishing process, the landing gear is further subjected to a vibration aging stress relief process.
The following are examples of the present invention:
example 1
Step 1) pretreatment: scrubbing the crack part of the landing gear by using 75% alcohol, and then air-drying to remove surface impurities;
step 2) spraying and repairing the base material: spraying a layer of 3mm aluminum alloy powder which is made of the same material as the landing gear on the surface of the crack part of the landing gear treated in the step 1) by using supersonic flame spraying equipment, wherein the pressure of oxygen, propane and nitrogen is respectively 0.65-0.85 MPa, 0.50-0.65 MPa and 0.85-1.05 MPa, the oxygen flow is 220-240L/min, and the granularity of the aluminum alloy powder is controlled to be 25-50 mu m;
step 3), spraying micro-melting ceramic: spraying a layer of 2mm micro-melting ceramic powder on the surface of the crack part of the landing gear treated in the step 2) by using supersonic flame spraying equipment, wherein the pressure of oxygen, propane and nitrogen is 0.45-0.65 MPa, 0.30-0.45 MPa and 0.50-0.70 MPa respectively, the spraying parameter of oxygen flow is 180-200L/min, the spraying temperature is controlled at 550-580 ℃, the micro-melting ceramic powder is a mixture of alumina ceramic powder and glass powder, the volume ratio is 1.8, and the particle sizes of the alumina ceramic powder and the glass powder in the micro-melting ceramic powder are controlled at 10-20 mu m;
step 4), deposition repair: repeating the spraying operation of the step 2) and the step 3) for 3 times, and then performing the operation of the step 2) again;
step 5) post-treatment: and (4) carrying out vibration aging stress relief treatment on the repaired undercarriage obtained in the step 4), and then carrying out polishing treatment on the spraying repair part to finish the repair.
Example 2
Step 1) pretreatment: scrubbing the crack part of the landing gear by using 75% alcohol, and then air-drying to remove surface impurities;
step 2) spraying and repairing the base material: spraying a layer of 2mm aluminum alloy powder which is made of the same material as the landing gear on the surface of the crack part of the landing gear treated in the step 1) by using supersonic flame spraying equipment, wherein the pressure of oxygen, propane and nitrogen is respectively 0.65-0.85 MPa, 0.50-0.65 MPa and 0.85-1.05 MPa, the oxygen flow is 220-240L/min, and the granularity of the aluminum alloy powder is controlled to be 5-25 mu m;
step 3), spraying micro-melting ceramic: spraying a layer of 1mm of micro-melting ceramic powder on the surface of the crack part of the landing gear treated in the step 2) by using supersonic flame spraying equipment, wherein the spraying temperature is controlled to be 550-580 ℃, the micro-melting ceramic powder is a mixture of alumina ceramic powder and glass powder, the volume ratio is 1.6, and the particle sizes of the alumina ceramic powder and the glass powder in the micro-melting ceramic powder are controlled to be 2-10 mu m by adopting the spraying parameters that the pressures of oxygen, propane and nitrogen are respectively 0.45-0.65 MPa, 0.30-0.45 MPa and 0.50-0.70 MPa, and the oxygen flow is 180-200L/min;
step 4), deposition repair: repeating the spraying operation of the step 2) and the step 3) for 4 times, and then performing the operation of the step 2) again;
step 5) post-treatment: carrying out vibration aging stress relief treatment on the repaired undercarriage obtained in the step 4), and then carrying out polishing treatment on the spraying repair part to finish the repair.
The spraying process of the embodiment 1 and the embodiment 2 of the invention is taken as an embodiment, the existing homogeneous supersonic speed cold spraying and homogeneous supersonic speed flame spraying additive repair technology is taken as a comparative example 1 and a comparative example 2, the crack undercarriage of a certain domestic conveyor in China is repaired, the treated undercarriage is installed on a sinking test machine, and a rising and falling simulation experiment test is carried out on a sinking test site, and the test result is shown in table 1.
Table 1 test result table of undercarriage repairing tester
The results in table 1 show that the process of the invention can be used for repairing the landing gear of a certain type of domestic transport plane, and the landing gear is tested on a sinking flight testing machine, cracks are not generated after more than 5000 times of rising and falling of the test, the crack initiation life is improved by more than one time compared with the prior art, and if the reinforcing sheet is arranged, the crack can be generated after more than 9000 times of rising and falling of the test. As shown in figures 1 and 2, the repairing coating of the landing gear crack component repaired by the spraying process has better overall compactness and more uniform spraying, and the overall appearance of the repairing coating is similar to that of homogeneous additive spraying.
The experimental data show that the repair effect of the spraying process on the undercarriage is very good, the comprehensive accounting is carried out by combining the use duration of raw materials, manpower and spraying equipment and the service life of the repaired undercarriage, and by adopting the repair process, compared with the conventional supersonic homogeneous cold spraying and hot spraying technologies, the comprehensive maintenance cost of the undercarriage can be reduced by more than 40%, and the economic benefit is very obvious.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (4)
1. A flame spraying construction method of a micro-melting ceramic coating is characterized by comprising the following steps:
step 1) pretreatment: cleaning the crack part of the undercarriage to remove surface impurities;
step 2) spraying and repairing the base material: spraying a layer of aluminum alloy powder which is the same as the material of the landing gear on the surface of the crack part of the landing gear treated in the step 1) by using supersonic flame spraying equipment, wherein the pressure of oxygen, propane and nitrogen is 0.65-0.85 MPa, 0.50-0.65 MPa and 0.85-1.05 MPa respectively, and the oxygen flow is 220-240L/min; the granularity of the aluminum alloy powder is 5-50 mu m, and the spraying thickness of the aluminum alloy powder is 1-3 mm;
step 3), spraying micro-melting ceramic: spraying micro-melting ceramic powder on the surface of the crack part of the landing gear treated in the step 2) by using supersonic flame spraying equipment, wherein the pressure of oxygen, propane and nitrogen is 0.45-0.65 MPa, 0.30-0.45 MPa and 0.50-0.70 MPa respectively, and the oxygen flow is 180-200L/min; the micro-melting ceramic powder is a mixture of alumina ceramic powder and glass powder, and the volume ratio of the alumina ceramic powder to the glass powder is 1.6-1.8; the granularity of the micro-melting ceramic powder is 2-20 mu m, the spraying thickness of the micro-melting ceramic powder is 1-2 mm, and the spraying temperature is controlled at 550-580 ℃; the granularity of the micro-melting ceramic powder is smaller than that of the aluminum alloy powder, and the spraying thickness of the micro-melting ceramic layer is smaller than or equal to that of the aluminum alloy spraying layer;
step 4), deposition repair: repeating the spraying operation of the step 2) and the step 3) for 2-4 times, and then performing the operation of the step 2) again;
step 5) post-treatment: polishing the spraying and repairing part of the repaired undercarriage obtained in the step 4) to finish repairing.
2. The flame spraying construction method of the micro-melting ceramic coating according to claim 1, characterized in that: in the step 1), 75% alcohol is selected for cleaning, and air drying is carried out after cleaning.
3. The flame spraying construction method of the micro-melting ceramic coating according to claim 1, characterized in that: in the step 4), the spraying operation of the step 2) and the step 3) is repeated for 3 times.
4. The flame spraying construction method of the micro-melting ceramic coating according to any one of claims 1 to 3, characterized in that: in the step 5), before polishing treatment, vibration aging stress relief treatment is carried out on the landing gear.
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