CN118218214A - Manufacturing process of heat-resistant coating of engine composite shell - Google Patents
Manufacturing process of heat-resistant coating of engine composite shell Download PDFInfo
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- CN118218214A CN118218214A CN202410384144.5A CN202410384144A CN118218214A CN 118218214 A CN118218214 A CN 118218214A CN 202410384144 A CN202410384144 A CN 202410384144A CN 118218214 A CN118218214 A CN 118218214A
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- 238000005507 spraying Methods 0.000 claims abstract description 112
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- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a manufacturing process of a heat-resistant coating of an engine composite shell, which comprises the following steps of 1) grinding the spraying surface of the composite shell; 2) Cleaning the surface; 3) Checking compressed air; 4) Coating the surface of the composite shell with a primer; 5) Coating configuration; 6) Spraying the surface of the composite shell for multiple times; 7) Detecting a heat-resistant coating; 8) And (5) finishing the surface of the coating. According to the invention, the shell is sprayed for three times in a sectionalized way, so that the residual quantity of the sprayed coating gasoline on the surface of the shell is reduced, and the product adhesive property is prevented from being reduced due to excessive quantity of the subsequent sprayed gasoline; the whole spraying system is cleaned after each spraying, so that the consistency of the spraying effect of each spraying device is ensured, the spraying device is divided into three sections, the residual quantity of gasoline is reduced, the coating is ensured not to foam, and the binding force of the coating is ensured.
Description
Technical Field
The invention relates to the technical field of aerospace engines, in particular to a manufacturing process of a heat-resistant coating of an engine composite shell.
Background
With the longer range and faster flying speed of tactical missiles, the mechanical properties of the missile shells are easily reduced due to pneumatic heating generated by friction between the tactical missiles and air during flying. Under the condition of pneumatic heating of a spacecraft (such as an electronic cabin), the temperature in the cabin is increased, so that precise instruments in the cabin are easily damaged (tactical missiles generally require the temperature inside a shell to be less than 300 ℃). Therefore, the external heat-proof material plays an important role in the quality assurance of the aerospace craft.
The early heat-resistant coating is prepared by adding a thermal decomposition filler into elastic resin such as polyurethane, polysulfide rubber modified epoxy resin and the like, decomposing the resin to generate gas in the rapid heating process, dispersing the gas in the resin in the form of bubbles, and reducing the heat conductivity of the resin. The third generation heat-proof paint developed at the end of the 80 s has the performance of being used at the ultra-high sound speed. By using higher Tg, high carbon residue after ablation, heat resistant resins such as phenolic resin, phenolic epoxy and silicone, the coating is able to withstand short term, high heat flux gas flow scouring of several Mach numbers. By the beginning of the 21 st century, heat-resistant coatings capable of being used under long-term and high Mach number airflows were developed by using modified silicone resins, silicones, silicone plastic elastomers and the like which have higher heat resistance and ablation resistance and have certain toughness. How to ensure that the thermal protection coating is firmly bonded with the shell interface under the high Mach number, and improve the spraying stability of the thermal protection coating also becomes an industry technical problem. The heat-resistant coating has extremely high heat insulation effect, so that the bonding performance between the heat-resistant coating and the shell and the overall uniformity of spraying are particularly important in the environment of high Mach number air flow. The uniformity of the coating is insufficient, the coating is directly debonded and damaged in the environment of high Mach number airflow, the composite material of the shell is exposed, the temperature is quickly raised, and the mechanical property of the shell is reduced.
At present, the heat-proof coating on the surface of the composite engine shell is only rough according to the spraying technical instruction of paint manufacturers, each manufacturer needs to change parameters according to the actual conditions of different manufacturers, normal operation cannot be formed, the spraying stability of the heat-proof coating cannot be ensured, and the appearance quality of a product cannot be improved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a manufacturing process of a heat-proof coating of an engine composite shell, which optimizes the manufacturing process of the heat-proof coating, improves the adaptability of product operation and ensures the stability and uniformity of the heat-proof coating of the product.
The purpose of the invention is realized in the following way: a manufacturing process of a heat-resistant coating of an engine composite shell comprises the following steps:
1) Polishing the spraying surface of the composite shell: polishing the surface of the substrate by adopting a pneumatic polisher, and carrying out local manual polishing by using sand paper;
2) Surface cleaning: after polishing, wiping the surface of the engine shell by using a reagent, and wiping the surface floating ash clean;
3) And (3) compressed air inspection: checking the quality of compressed air in an air inlet pipeline, spraying the compressed air on clean white paper by using an air pipe, and requiring oil-free and water-free;
4) And (3) coating and spraying the primer coating on the surface of the composite shell: preparing a coating curing agent and gasoline according to a certain proportion, cleaning the surface of the shell for the last time, and checking the surface of the shell after the gasoline volatilizes to ensure that the surface gloss is uniform and consistent;
5) Coating configuration: preparing an organosilicon material, a curing agent and gasoline according to a certain proportion; adjusting the addition amount of the curing agent according to the construction temperature; weighing organic silicon materials and gasoline, stirring for a certain time by using a pneumatic stirrer until no lump matters exist in the coating, filtering by using a metal filter screen, adding a curing agent according to the proportion, and stirring for a certain time;
6) And (3) coating the surface of the composite shell in a plurality of times: the surface of the shell is sprayed with the prepared coating in three sections through a spraying device, and after the coating is cured at room temperature after the coating is sprayed for the first time with corresponding thickness, the surface of the coating is polished; then, after the coating is sprayed for the second time to have corresponding thickness and solidified at room temperature, polishing the surface of the coating; curing at room temperature after the third spraying, and finally curing in an oven; cleaning the spray gun and the spraying integral pipeline after each spraying is finished, and keeping the spraying pipeline clean and free of blockage;
7) And (3) detecting a heat-resistant coating: detecting the weight, thickness, hardness and cohesiveness of the coating;
8) Coating surface finishing: the Shore A hardness of the coating is more than or equal to 50, and the coating is trimmed by pneumatic sanding machine sand paper; the local repair of the coating adopts a manual brushing or scraping coating process; and polishing the part to be repaired by using a pneumatic polisher or sand paper, and cleaning by using compressed air.
In order to improve the efficiency of cleaning the spraying pipeline and the spray gun, the spraying device in the step 6) specifically comprises a paint bucket and a gasoline bucket, wherein a valve I is arranged on the paint bucket, a valve II is arranged on the gasoline bucket, the paint bucket and the gasoline bucket are connected with a spraying material pipe through the valve I and the valve II, and a valve III is arranged on the spraying material pipe.
In order to reduce the residual amount of the gasoline of the sprayed coating on the surface of the shell, the step 6) of spraying the surface of the shell by using the prepared coating through the spraying device in three sections specifically comprises the following steps: spraying under the environment with humidity of 30-70% and temperature of 15-35 ℃, rotating speed of 12r/min, running speed of an automatic spray gun of 12-15mm/s, distance between the spray gun and the shell of 200-300mm, fan width of the spray gun of 150-300mm, spray gun vertical to the surface of the shell, uniformly spraying along the direction from front skirt to rear skirt, and overlapping the two spraying areas by about 1/2; the thickness of single spraying is 200-500um, and no light is lost within 10 seconds after the spraying is finished; the spraying time of the two times at the same position is not less than 30min.
In order to keep the spray pipeline clean and free of blockage and achieve uniformity of spraying, cleaning the spray gun and the spray integral pipeline after each spraying in the step 6) specifically comprises the following steps: after the spraying is finished, firstly closing a valve I on a paint bucket, opening a valve II on a gasoline bucket, pressurizing to a proper pressure by using compressed air, starting a spray gun, cleaning the spray gun and a spraying material pipe, then closing a valve III on the spraying material pipe, unloading the pressure of the paint bucket, opening a paint bucket cover, taking out an upper cover, placing the upper cover on a waste bucket, opening the valve I on the paint bucket, applying air pressure to the gasoline bucket, and cleaning a material pipe close to the end of the paint bucket and an internal pipeline of the paint bucket.
As a further limitation of the present invention, the paint curing agent in step 4) is configured with gasoline according to a certain proportion, and specifically includes: the coating TR-52 curing agent is adopted: gasoline=1:20 is configured 1200g-1500g.
As a further limitation of the present invention, in step 5), the organosilicon material, the curing agent and the gasoline are configured according to a certain proportion; the adjusting of the addition amount of the curing agent according to the construction temperature specifically comprises the following steps: the proportion is that the organic silicon material: curing agent: gasoline = 100: 0.5:120-100:1.5:120; when the construction temperature is 15-20 ℃, the addition amount of the curing agent is 1.0-1.5; when the construction temperature is 20-35 ℃, the addition amount of the curing agent is 0.5-1.0.
As a further definition of the present invention, the step 8) specifically includes: before blade coating or brush coating, the brush or scraper blade is cleaned by gasoline and then is configured with paint: when brushing or knife coating, the proportion is that the organic silicon material: curing agent: gasoline = 100:1.5: 20-100:1.5:80; coating the TR-52 paint on the part to be coated, wherein the thickness of the single brush coating is 0.3-0.4mm, the thickness of the single brush coating is not more than 1mm, and the interval time between the two brush coating and the knife coating is not less than 30 min; repairing the hole left by thickness measurement, scraping and filling the actually measured thick hole by using a TR-52 coating, and lightly polishing by using sand paper until no step is left to the hand touch after the curing hardness is more than or equal to 50A.
Compared with the prior art, the invention adopts the technical scheme and has the beneficial effects that: the spraying process optimizes the spraying stage and ensures the full volatilization of the gasoline; the apparent treatment of staged spraying improves the apparent quality of the coating and ensures the compactness of the coating; the design of the material pipe cleaning system ensures the uniformity of spraying, improves the overall product, improves the overall bonding strength of the shell, and reduces the later coating finishing process.
Because the heat-resistant paint is a relatively viscous solid, the diluent is gasoline, the volatilization speed is high, in the spraying process, the prepared paint is poured into a pressure barrel, paint residues at a nozzle after a spray gun is closed and gasoline contacted with air from the spray gun nozzle volatilizes, the paint can be quickly dried and agglomerated, the whole spraying system is blocked, the non-uniformity of the sprayed paint is caused, the apparent mass of a product is reduced, and the surface burrs are more and uneven. The invention provides a spraying process of a heat-resistant coating, which is used for cleaning the whole spraying system by spraying each time, ensuring the consistency of the spraying effect of each spraying equipment, and realizing three-section spraying, reducing the residual quantity of gasoline, ensuring that the coating cannot foam, and ensuring the cohesive force of the coating.
Drawings
FIG. 1 is a flow chart of the present invention.
Fig. 2 is a schematic view of a spray device according to the invention.
Wherein, 1 paint bucket, 2 gasoline bucket, 3 valve one, 4 valve two, 5 valve three.
Detailed Description
In combination with the existing mature spraying technology and forming technology, materials are selected according to the heat protection requirement, and the material properties are shown in the following table 1:
TABLE 1 Material Performance data
The manufacturing process of the heat-resistant coating of the engine composite shell shown in fig. 1 specifically comprises the following steps:
1) Polishing the spraying surface of the composite shell: polishing the surface of the base material by adopting a pneumatic polisher (80-mesh sand paper is used and the air pressure is 0.4-0.5 MPa), and carrying out local manual polishing by using the sand paper until the surface of the base material loses gloss and is slightly whitish;
2) Surface cleaning: after finishing polishing, wiping the surface of the engine shell by using ethyl acetate or acetone, and wiping the surface floating ash cleanly until the clean white cotton cloth is basically not discolored;
3) And (3) compressed air inspection: checking the quality of compressed air in an air inlet pipeline, spraying the compressed air on clean white paper by using an air pipe, and requiring oil-free and water-free;
4) And (3) coating and spraying the primer coating on the surface of the composite shell: the coating TR-52 curing agent and No. 120 gasoline=1:20 are used for preparing 1200 g-1500 g, the surface of the shell is cleaned for the last time, and the surface of the shell is inspected after the gasoline volatilizes, so that the surface gloss is uniform and consistent;
5) TR-52 paint configuration: the proportion is that the organic silicon material: curing agent: gasoline = 100: (0.5-1.5): 120; when the construction temperature is 15-20 ℃, the addition amount of the curing agent is 1.0-1.5; when the construction temperature is 20-35 ℃, the addition amount of the curing agent is 0.5-1.0; weighing an organic silicon material and No. 120 gasoline, stirring for more than 2 minutes by using a pneumatic stirrer until no lump matters exist in the TR-52 coating, filtering by using a 20-mesh metal filter screen, adding a curing agent according to the proportion, and stirring for more than 2 minutes to obtain the coating, wherein the organic silicon material is a silicon rubber base material, inorganic seasonings such as phosphorus-nitrogen organic materials, mica and the like are added, and the curing agent is a silicon rubber platinum vulcanizing agent;
6) And (3) coating the surface of the composite shell in a plurality of times: the surface of the shell is sprayed with the prepared coating in three sections through a spraying device, and after the coating is cured at room temperature after the coating is sprayed for the first time with corresponding thickness, the surface of the coating is polished; then, after the coating is sprayed for the second time to have corresponding thickness and solidified at room temperature, polishing the surface of the coating; curing at room temperature after the third spraying, and finally curing in an oven; cleaning the spray gun and the spraying integral pipeline after each spraying is finished, and keeping the spraying pipeline clean and free of blockage;
As shown in fig. 2, the spraying device specifically comprises a paint bucket 1 and a gasoline bucket 2, wherein a valve I3 is arranged on the paint bucket 1, a valve II 4 is arranged on the gasoline bucket 2, the paint bucket 1 and the gasoline bucket 2 are connected with a spraying material pipe through the valve I3 and the valve II 4, and a valve III 5 is arranged on the spraying material pipe.
The spraying process comprises the following steps: spraying under the environment with humidity of 30-70% and temperature of 15-35 ℃, pouring the prepared and uniformly stirred TR-52 paint into a spraying system tank, setting the pressure of a pressure tank to 0.2MPa, waiting for a pneumatic stirrer to stir for 2min to start spraying, ensuring uniform spraying, controlling the spraying pressure of a spray gun to be 0.2MPa, and calling a spraying program to start spraying. Spraying by using a two-dimensional winding machine, wherein the spraying program requires to write the program according to the rotating speed of 12r/min, the running speed of an automatic spray gun of 13mm/s and the single spraying surface width of 75 mm; the distance between the spray gun and the shell is 250mm, the fan width of the spray gun is 150+/-20 mm, the spray gun is vertical to the surface of the shell, the spray gun is uniformly sprayed along the direction from the front skirt to the rear skirt, and the two spraying areas overlap by about 1/2; the thickness of single spraying is 250-300um, no light is lost within 10s after the spraying is finished, the interval time between two spraying at the same position is not less than 30min, and gasoline is required to be used for cleaning after each spraying is finished. Each section is sprayed for 2-3mm, cured for 12 hours at room temperature, polished and then sprayed until the overall thickness of the sprayed coating reaches more than 7.5 mm.
Curing: and (3) after the third time of curing at room temperature (not lower than 15 ℃) for more than 12 hours, feeding the coating into an oven for curing, wherein the curing temperature is 70 ℃, the heating rate is 1 ℃/min, the cooling rate is 1 ℃/min, and the curing time at 70 ℃ is more than or equal to 12 hours until the Shore A hardness of the coating is more than or equal to 60A.
Cleaning the spray gun and the whole spray pipeline after each spray coating is completed specifically comprises the following steps: after the spraying is finished, firstly, a valve I3 on a paint bucket 1 is closed, a valve II 4 on a gasoline bucket 2 is opened, compressed air is used for pressurizing to proper pressure, a spray gun is started, the spray gun and a spraying material pipe are cleaned, a valve III 5 on the spraying material pipe is closed, the pressure of the paint bucket is discharged, a paint bucket cover is opened, an upper cover is taken out and placed on a waste bucket, a valve I3 on the paint bucket 1 is opened, air pressure is applied to the gasoline bucket 2, and a pipeline close to the end material pipe of the paint bucket and the interior of the paint bucket is cleaned.
7) And (3) detecting a heat-resistant coating: detecting the weight, thickness, hardness and cohesiveness of the coating;
And (3) coating weight detection: weighing the sprayed shell, and calculating the coating weight;
Thickness detection: detecting the thickness of the coating by using a verified coating thickness gauge, and detecting a measuring tool with the outer diameter of the shell barrel section required by using precision;
Hardness testing: the verified Shore A hardness agent is used for measuring the surface coating of the shell, the test hardness is required to be more than or equal to 60A, and the surface heat-resistant coating is cured without problems;
And (3) detecting the cohesiveness: using an air gun to check the bonding condition of the heat-proof coatings at the end faces of the front skirt and the rear skirt, wherein the pressure of compressed air is required to be not lower than 0.5MPa, the distance between a gun nozzle and a checked position is not more than 50mm, and the end face heat-proof coating is ensured not to be de-bonded; and checking the bonding condition of the heat-resistant coating of any piece of test piece along with the furnace by using a plane cutter, and confirming that the bonding phenomenon does not exist.
8) Coating surface finishing: the Shore A hardness of the coating is more than or equal to 50, and the coating is trimmed by pneumatic sanding machine sand paper; the local repair of the coating adopts a manual brushing or scraping coating process; polishing the part to be repaired by using a pneumatic polisher or sand paper, and cleaning by using compressed air; before blade coating/brushing, the brush or scraper is cleaned by gasoline and then is prepared with paint: when in brush coating/knife coating, the proportion is that the organic silicon material: curing agent: no. 120 gasoline = 100:1.5: (20-80); the TR-52 coating is brushed/scraped on the part to be coated of the product, the thickness of the single brushing is 0.3-0.4mm, the thickness of the single scraping is not more than 1mm, and the interval time between the two brushing/scraping is not less than 30min until the thickness of the coating meets the requirement. Repairing holes left by thickness measurement, scraping and filling the actually measured thick holes by using TR-52 paint, and lightly polishing by using 320-mesh sand paper until no step is left when the curing hardness is more than or equal to 50A.
The invention uses a spraying tool to be connected to a threaded hole at the skirt end of a missile shell, so that the product can rotate in the spraying process, the spraying is carried out for 2mm-3mm once, the second spraying is carried out for 2mm-3mm at intervals of 12 hours, and the final spraying is carried out at intervals of 12 hours until the thickness reaches the requirement of more than 7.5 mm; the shell is sprayed for 3 times in sections, so that the residual quantity of the sprayed coating gasoline on the surface of the shell is reduced, and the product adhesive property is prevented from being reduced due to excessive quantity of the subsequent sprayed gasoline; the whole spraying system is cleaned by each spraying, so that the consistency of the spraying effect of each spraying device is ensured, the spraying is divided into three sections, the residual quantity of gasoline is reduced, the coating is ensured not to foam, and the adhesive force of the coating is ensured; the external heat-proof coating sprayed by the spraying process has good stability, is beneficial to ensuring the overall uniformity of the heat-proof coating, and improves the efficiency for the surface finishing of the subsequent coating.
The invention is not limited to the above embodiments, and based on the technical solution disclosed in the invention, a person skilled in the art may make some substitutions and modifications to some technical features thereof without creative effort according to the technical content disclosed, and all the substitutions and modifications are within the protection scope of the invention.
Claims (7)
1. The manufacturing process of the heat-resistant coating of the engine composite shell is characterized by comprising the following steps of:
1) Polishing the spraying surface of the composite shell: polishing the surface of the substrate by adopting a pneumatic polisher, and carrying out local manual polishing by using sand paper;
2) Surface cleaning: after polishing, wiping the surface of the engine shell by using a reagent, and wiping the surface floating ash clean;
3) And (3) compressed air inspection: checking the quality of compressed air in an air inlet pipeline, spraying the compressed air on clean white paper by using an air pipe, and requiring oil-free and water-free;
4) And (3) coating and spraying the primer coating on the surface of the composite shell: preparing a coating curing agent and gasoline according to a certain proportion, cleaning the surface of the shell for the last time, and checking the surface of the shell after the gasoline volatilizes to ensure that the surface gloss is uniform and consistent;
5) Coating configuration: preparing an organosilicon material, a curing agent and gasoline according to a certain proportion; adjusting the addition amount of the curing agent according to the construction temperature; weighing organic silicon materials and gasoline, stirring for a certain time by using a pneumatic stirrer until no lump matters exist in the coating, filtering by using a metal filter screen, adding a curing agent according to the proportion, and stirring for a certain time;
6) And (3) coating the surface of the composite shell in a plurality of times: the surface of the shell is sprayed with the prepared coating in three sections through a spraying device, and after the coating is cured at room temperature after the coating is sprayed for the first time with corresponding thickness, the surface of the coating is polished; then, after the coating is sprayed for the second time to have corresponding thickness and solidified at room temperature, polishing the surface of the coating; curing at room temperature after the third spraying, and finally curing in an oven; cleaning the spray gun and the spraying integral pipeline after each spraying is finished, and keeping the spraying pipeline clean and free of blockage;
7) And (3) detecting a heat-resistant coating: detecting the weight, thickness, hardness and cohesiveness of the coating;
8) Coating surface finishing: the Shore A hardness of the coating is more than or equal to 50, and the coating is trimmed by pneumatic sanding machine sand paper; the local repair of the coating adopts a manual brushing or scraping coating process; and polishing the part to be repaired by using a pneumatic polisher or sand paper, and cleaning by using compressed air.
2. The process for manufacturing the heat-resistant coating of the composite shell of the engine according to claim 1, wherein in the step 6), the spraying device specifically comprises a paint bucket and a gasoline bucket, a valve I is arranged on the paint bucket, a valve II is arranged on the gasoline bucket, the paint bucket and the gasoline bucket are connected with a spraying material pipe through the valve I and the valve II, and a valve III is arranged on the spraying material pipe.
3. The process for manufacturing a heat-resistant coating for a composite engine casing according to claim 1, wherein the step 6) of spraying the surface of the casing with the prepared paint in three steps by a spraying device comprises: spraying under the environment with humidity of 30-70% and temperature of 15-35 ℃, rotating speed of 12r/min, running speed of an automatic spray gun of 12-15mm/s, distance between the spray gun and the shell of 200-300mm, fan width of the spray gun of 150-300mm, spray gun vertical to the surface of the shell, uniformly spraying along the direction from front skirt to rear skirt, and overlapping the two spraying areas by about 1/2; the thickness of single spraying is 200-500um, and no light is lost within 10 seconds after the spraying is finished; the spraying time of the two times at the same position is not less than 30min.
4. The process for manufacturing the heat-resistant coating of the composite engine shell according to claim 2, wherein the cleaning of the spray gun and the spray integral pipeline after each spraying in the step 6) specifically comprises the following steps: after the spraying is finished, firstly closing a valve I on a paint bucket, opening a valve II on a gasoline bucket, pressurizing to a proper pressure by using compressed air, starting a spray gun, cleaning the spray gun and a spraying material pipe, then closing a valve III on the spraying material pipe, unloading the pressure of the paint bucket, opening a paint bucket cover, taking out an upper cover, placing the upper cover on a waste bucket, opening the valve I on the paint bucket, applying air pressure to the gasoline bucket, and cleaning a material pipe close to the end of the paint bucket and an internal pipeline of the paint bucket.
5. The process for manufacturing the heat-resistant coating of the composite engine shell according to claim 1, wherein the paint curing agent and gasoline in the step 4) are configured according to a certain proportion, and specifically comprises the following steps: the coating TR-52 curing agent is adopted: gasoline=1:20, configuration 1200g-1500 g.
6. The process for manufacturing the heat-resistant coating of the engine composite shell according to claim 1, wherein in the step 5), an organosilicon material, a curing agent and gasoline are prepared according to a certain proportion; the adjusting of the addition amount of the curing agent according to the construction temperature specifically comprises the following steps: the proportion is that the organic silicon material: curing agent: gasoline = 100: 0.5:120-100:1.5:120; when the construction temperature is 15-20 ℃, the addition amount of the curing agent is 1.0-1.5; when the construction temperature is 20-35 ℃, the addition amount of the curing agent is 0.5-1.0.
7. The process for manufacturing a heat-resistant coating for a composite engine casing according to claim 1, wherein the step 8) specifically comprises: before blade coating or brush coating, the brush or scraper blade is cleaned by gasoline and then is configured with paint: when brushing or knife coating, the proportion is that the organic silicon material: curing agent: gasoline = 100:1.5: 20-100:1.5:80; coating the TR-52 paint on the part to be coated, wherein the thickness of the single brush coating is 0.3-0.4mm, the thickness of the single brush coating is not more than 1mm, and the interval time between the two brush coating and the knife coating is not less than 30min; repairing the hole left by thickness measurement, scraping and filling the actually measured thick hole by using a TR-52 coating, and lightly polishing by using sand paper until no step is left to the hand touch after the curing hardness is more than or equal to 50A.
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| CN202410384144.5A CN118218214A (en) | 2024-04-01 | 2024-04-01 | Manufacturing process of heat-resistant coating of engine composite shell |
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| CN202410384144.5A CN118218214A (en) | 2024-04-01 | 2024-04-01 | Manufacturing process of heat-resistant coating of engine composite shell |
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