CN103614691A - Slurry-type silicon-aluminizing protection method of DD6 monocrystal superalloy blades - Google Patents
Slurry-type silicon-aluminizing protection method of DD6 monocrystal superalloy blades Download PDFInfo
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Abstract
The invention discloses a slurry-type silicon-aluminizing protection method of DD6 monocrystal superalloy blades, which belongs to the field of heat treatment. The method is implemented through the following steps: (1) slurry preparation: mixing an aluminizing agent, a binder and an ethanol solution so as to obtain slurry; and (2) carrying out silicon aluminizing: after the surface of a DD6 monocrystal superalloy low-pressure turbine operating blade is cleaned by using acetone and then dried, protecting a non-aluminized surface by using a high-temperature adhesive tape, uniformly spraying the prepared slurry to the runner surface of the blade by using a spray gun, then drying the blade 2 h in a drying oven, placing the blade in an aluminizing tank of a silicon-aluminizing furnace, carrying out heat preservation on the blade 2-3 h in an argon atmosphere at a temperature of 700-750 DEG C, hanging the aluminizing tank out of the furnace, simultaneously closing argon and an exhaust valve, opening the aluminizing tank and taking the blade out of the aluminizing tank after the aluminizing tank is cooled below 80 DEG C, and after silicon aluminizing is completed, carrying out secondary ageing diffusion on the blade under the condition of 900 DEG C*16 h by using a vacuum furnace, so that a 0.02-0.04 mm silicon-aluminizing layer meeting design requirements is prepared. According to the invention, a part can be partially coated with a coating; a complex multicomponent coating can be prepared by using a simple method.
Description
Technical field
The invention belongs to Field of Heat-treatment, particularly a kind of slip type aluminising silicon means of defence of DD6 single crystal super alloy blade.
Background technology
Blade is the important hot-end component of aircraft engine, and under working conditions, its surface exists high temperature oxidation and corrosion phenomenon.In order to extend blade work-ing life, its process for protecting surface enjoys countries in the world to pay close attention to always.DD6 single crystal super alloy is the second generation single crystal superalloy of developing in recent years.Compare DD6 single crystal super alloy with axle such as grade or directed nickel base superalloy and there is higher working temperature, thereby be applied to gradually the manufacture of aero engine turbine blades, it is the developing direction of alternate-engine, before improving engine turbine, temperature can make the working conditions of single crystal turbine blade more harsh, the corrosion of blade and oxidation just become a technical barrier of engine design
At present the surface protection coating of high-temperature alloy blades is mainly divided into following several: 1. 2. 3. 4. thermal barrier coating of coating of modified aluminide coating of aluminide coating.Wherein slip type aluminising silicon belongs to modified aluminide coating.Aluminide coating is the surface protection coating developing the earliest, and its protection effect is general.Coating and thermal barrier coating are two type coatings of developed recently, can prepare anti-oxidant type coating and corrosion-resistant coating according to working conditions adjusting component, but production cost are higher, and equipment is also had higher requirements, and the scope of application is limited.The modified aluminide coating of aluminium silicon, resistance to high temperature oxidation, heat and corrosion resistant performance are superior, and cost is cheap compared with platinum aluminium protective coating, thereby are used widely.Aluminium silicon protective coating can be prepared by several different methods, as solid process, gas method, slurry process, chemical Vapor deposition process.Solid process is that the part that needs are applied is placed in container, and container is filled with pulverulent mixture.This mixture contains the activator of the powder of the metal or alloy that forms coating and the salt of halogen and neutral substance conventionally.The important difference of solid process and additive method is that part packs into be in pulverous mixture and (wherein adds activator), and metal reacts and forms gaseous compound with activator in mixture.Solid process is simple, need not use complicated fixture and equipment, is mainly to produce the high quality uniform coating that there is no pore and do not peel off defect.Gas method and chemical Vapor deposition process are all to produce coating with gas method, first make the gaseous state industrialization compound containing saturated element, then flowed to part, contact bottom layer, at bottom, through pyrolysis, reduction reaction, disproportionation reaction or other gas transmissions reaction, be settled out the atom of saturated element, form coating.The feature of this method is, saturated metal is present in gas phase with the compound form of volatilization, and saturated metal itself does not contact with part or sample.
Slurry process be coated material with slip form,, with the form of the concentrated suspension liquid of metal oxide powder or other compound powders, be sprayed on piece surface, then sintering at high temperature.Slurry process is produced the process of coating, and with slip fusing or slip evaporation and deposit on bottom, or in slip, metal component and all phenomenons of bottom direct effect occur simultaneously.
Summary of the invention
For improving the anti-oxidant and corrosion resistance of blade surface, the present invention proposes a kind of slip type aluminising silicon means of defence of DD6 single crystal super alloy blade, adopts slip spraying method on the blast tube surface of blade, listrium and the integral shroud of blade, to prepare the aluminising silicon layer that thickness is 0.02mm～0.04mm.
The slip type aluminising silicon means of defence of a kind of DD6 single crystal super alloy of the present invention blade, carries out according to following steps:
(1) slip configuration
The silica flour of the Nickel Aluminium Alloy Powder of mass percent 20～30% and 70 ~ 80% is mixed, then add the ammonium chloride of above-mentioned two kinds of powder total masses 3～5%, above three kinds of powder are put into ball grinder and carry out making penetration enhancer after ball milling, roasting;
By the 2:9 mixing by volume of polyvinyl alcohol, water, after stirring, add ethanolic soln dilution, make binding agent;
Add ethanolic soln volume be polyvinyl alcohol, aqueous solution volume 1.5 times;
Again penetration enhancer, binding agent, ethanolic soln are mixed and made into slip; Wherein the volume ratio of the quality of penetration enhancer and binding agent, ethanolic soln is 100g:30ml:100ml ratio;
(2) aluminising silicon
DD6 single crystal super alloy low-pressure turbine working-blade surface is used after acetone cleaning, drying, with the non-surface of oozing of high temperature gummed tape protection, then utilize spray gun that the slip configuring is evenly sprayed to blade passage surface, after spraying at drying in oven 2h, blade is contained in to oozing in tank of aluminising silicon stove, in argon gas atmosphere, at 700～750 ℃, be incubated 2～3h, to ooze tank hangs out in stove, close argon gas and vent valve valve simultaneously, to be cooledly to opening below 80 ℃, ooze tank and take out blade, after aluminising silicon completes, with vacuum oven, blade is carried out the secondary ageing diffusion of 900 ℃ * 16h, prepare the aluminising silicon layer that meets design requirements 0.02mm ~ 0.04mm.
Described ethanolic soln is that mass percent is 70% aqueous ethanolic solution.
Low-pressure turbine working-blade adopts the manufacture of DD6 single crystal super alloy, and Working environment is comparatively harsh, and the feature of DD6 single crystal super alloy low-pressure turbine working-blade is thin-walled hollow, and never prepares aluminising silicon protective coating on monocrystal material surface.In order to obtain the aluminising silicon layer of even thickness, surperficial non-oxidation, need in thering is the aluminising silicon stove of argon shield, carry out aluminising silicon.In order to make single crystal blade surfaces of aluminum weight percent be greater than 20%, silicon weight percent is less than 8%, to possess good resistance of oxidation, need to configure a certain proportion of slip.
The slip type aluminising silicon means of defence of a kind of DD6 single crystal super alloy of the present invention blade has many good qualities, and the most important thing is: can topical application coating on part; Available better simply method is produced complicated polycomponent coating; Can in operating process, make to apply two processes of the overheated structure restoration of component and component and carry out simultaneously, method is to select corresponding heat treating regime; On the heavy parts of expansion plane, during applying coating, particularly, under the local saturated condition of needs, the economic benefit of slurry process is very high.Adopt slip spraying method at the blast tube surface of blade, listrium and the integral shroud of blade preparation aluminising silicon layer, make blade resistance of oxidation improve 2 times of left and right than matrix, corrosion resistance improves 15 times of left and right.The method is simple, production efficiency is high, antioxidant anticorrosive performance is good.
figure of description
Fig. 1 is fabricated part pictorial diagram after embodiment 1 aluminising silicon,
Fig. 2 is the Cross Section Morphology after embodiment 1 blade aluminising silicon,
Fig. 3 is the Cross Section Morphology after embodiment 2 blade aluminising silicon,
Fig. 4 is the Cross Section Morphology after embodiment 3 blade aluminising silicon.
Embodiment
Its chemical composition of DD6 single crystal super alloy blade of the present invention is as shown in table 1.
Table l DD6 single crystal super alloy leaf chemical ingredient (wt) %
| Composition | C | Cr | Co | W | Mo | Ta | Al | Re | Hf | Nb | Ni |
| Content | 0.001~0.040 | 3.8~4.8 | 8.5~9.5 | 7.0~9.0 | 1.5~2.5 | 6.0~8.5 | 5.2~6.2 | 1.6~2.4 | 0.05~0.15 | 0.0~1.2 | Surplus |
In the embodiment of the present invention, the model of scanning electron microscope used is SUPRA55 type.
embodiment 1
A slip type aluminising silicon means of defence for DD6 single crystal super alloy blade, carries out according to following steps:
(1) slip configuration
The silica flour of the Nickel Aluminium Alloy Powder of mass percent 20% and 80% is mixed, then add the ammonium chloride of above-mentioned two kinds of powder total masses 5%, above three kinds of powder are put into ball grinder and carry out making penetration enhancer after ball milling, roasting;
By the 2:9 mixing by volume of polyvinyl alcohol, water, after stirring, add ethanolic soln dilution, make binding agent;
Add ethanolic soln volume be polyvinyl alcohol, aqueous solution volume 1.5 times;
Again penetration enhancer, binding agent, ethanolic soln are mixed and made into slip; Wherein the volume ratio of the quality of penetration enhancer and binding agent, ethanolic soln is 100g:30ml:100ml ratio;
(2) aluminising silicon
DD6 single crystal super alloy low-pressure turbine working-blade surface is used after acetone cleaning, drying, with the non-surface of oozing of high temperature gummed tape protection, then utilize spray gun that the slip configuring is evenly sprayed to blade passage surface, after spraying at drying in oven 2h, blade is contained in to oozing in tank of aluminising silicon stove and in argon gas atmosphere, at 750 ℃, is incubated 2.5h, to ooze tank hangs out in stove, close argon gas and vent valve valve simultaneously, to be cooledly to opening below 80 ℃, ooze tank and take out blade, after aluminising silicon completes, with vacuum oven, blade is carried out the secondary ageing diffusion of 900 ℃ * 16h, prepare the aluminising silicon layer that meets design requirements 0.025mm ~ 0.035mm.
Described ethanolic soln is that mass percent is 70% aqueous ethanolic solution.
Pattern to aluminising silicon layer detects, the single crystal blade pattern after slip method aluminising silicon as shown in Figure 1, blade passage smooth surface, the consistent gray of color even as seen from the figure, non-scale, tenon oozes without leakage, pore is without obstruction.
By scanning electron microscope to the Cross Section Morphology of aluminising silicon layer as shown in Figure 2, aluminising silicon layer divides two outer layers and diffusion layer.Outermost layer aluminium content 23% left and right, silicone content only has 6% left and right, and aluminium element ecto-entad reduces gradually, and its skin is mainly β-NiAl phase, and diffusion layer is mainly the Carbide Phases of chromium, has slowed down surfaces of aluminum atom to alloy substrate internal divergence.According to the chemical composition analysis in infiltration layer, outside surface can significantly improve the anti-oxidant and corrosion resistance of matrix.
Blade after aluminising silicon carries out 200h static oxidation test, the anti-oxidant test of 1000 ℃/200h constant temperature adopts interruption weighting method to carry out in high temperature static air, when coming out of the stove, sample with quartz wafer, the crucible of splendid attire sample is covered one by one, after sample oxidation, use scales/electronic balance weighing, while weighing, the oxide film peeling off in crucible counts total gain in weight, matrix DD6 material weightening finish 0.70mg/cm during 200h
2, with weightening finish 0.43 mg/cm of aluminising silicon layer
2.
To the blade hot salt corrosion test after aluminising silicon, test is to use 5%NaCl+95%Na
2sO
4solution is coated on sample, tests matrix DD6 material weightening finish 30mg/cm during 100h in air furnace at 900 ℃
2, with the weightening finish 2mg/cm of aluminising silicon layer
2.Therefore aluminising silicon layer is remarkable to blade body material protection effect, and blade resistance of oxidation improves approximately 2 times than matrix, and corrosion resistance improves approximately 15 times, has extended the work-ing life of blade.
embodiment 2
A slip type aluminising silicon means of defence for DD6 single crystal super alloy blade, carries out according to following steps:
(1) slip configuration
The silica flour of the Nickel Aluminium Alloy Powder of mass percent 20% and 80% is mixed, then add the ammonium chloride of above-mentioned two kinds of powder total masses 5%, above three kinds of powder are put into ball grinder and carry out making penetration enhancer after ball milling, roasting;
By the 2:9 mixing by volume of polyvinyl alcohol, water, after stirring, add ethanolic soln dilution, make binding agent;
Add ethanolic soln volume be polyvinyl alcohol, aqueous solution volume 1.5 times;
Again penetration enhancer, binding agent, ethanolic soln are mixed and made into slip; Wherein the volume ratio of the quality of penetration enhancer and binding agent, ethanolic soln is 100g:30ml:100ml ratio;
(2) aluminising silicon
DD6 single crystal super alloy low-pressure turbine working-blade surface is used after acetone cleaning, drying, with the non-surface of oozing of high temperature gummed tape protection, then utilize spray gun that the slip configuring is evenly sprayed to blade passage surface, after spraying at drying in oven 2h, blade is contained in to oozing in tank of aluminising silicon stove and in argon gas atmosphere, at 750 ℃, is incubated 2h, to ooze tank hangs out in stove, close argon gas and vent valve valve simultaneously, to be cooledly to opening below 80 ℃, ooze tank and take out blade, after aluminising silicon completes, with vacuum oven, blade is carried out the secondary ageing diffusion of 900 ℃ * 16h, prepare the aluminising silicon layer that meets design requirements 0.02mm ~ 0.03mm.
Described ethanolic soln is that mass percent is 70% aqueous ethanolic solution.
Pattern to aluminising silicon layer detects, blade passage smooth surface, the consistent gray of color even, and non-scale, tenon oozes without leakage, and pore is without obstruction.
By scanning electron microscope, the Cross Section Morphology of aluminising silicon layer is detected as shown in Figure 3, aluminising silicon layer divides two outer layers and diffusion layer.Outermost layer aluminium content 21% left and right, silicone content only has 5% left and right, and aluminium element ecto-entad reduces gradually, and its skin is mainly β-NiAl phase, and diffusion layer is mainly the Carbide Phases of chromium, has slowed down surfaces of aluminum atom to alloy substrate internal divergence.According to the chemical composition analysis in infiltration layer, outside surface can significantly improve the anti-oxidant and corrosion resistance of matrix.Aluminising silicon layer is remarkable to blade body material protection effect after testing, and blade resistance of oxidation improves approximately 2 times than matrix, and corrosion resistance improves approximately 15 times, has extended the work-ing life of blade.
embodiment 3
A slip type aluminising silicon means of defence for DD6 single crystal super alloy blade, carries out according to following steps:
(1) slip configuration
The silica flour of the Nickel Aluminium Alloy Powder of mass percent 20% and 80% is mixed, then add the ammonium chloride of above-mentioned two kinds of powder total masses 5%, above three kinds of powder are put into ball grinder and carry out making penetration enhancer after ball milling, roasting;
By the 2:9 mixing by volume of polyvinyl alcohol, water, after stirring, add ethanolic soln dilution, make binding agent;
Add ethanolic soln volume be polyvinyl alcohol, aqueous solution volume 1.5 times;
Again penetration enhancer, binding agent, ethanolic soln are mixed and made into slip; Wherein the volume ratio of the quality of penetration enhancer and binding agent, ethanolic soln is 100g:30ml:100ml ratio;
(2) aluminising silicon
DD6 single crystal super alloy low-pressure turbine working-blade surface is used after acetone cleaning, drying, with the non-surface of oozing of high temperature gummed tape protection, then utilize spray gun that the slip configuring is evenly sprayed to blade passage surface, after spraying at drying in oven 2h, blade is contained in to oozing in tank of aluminising silicon stove and in argon gas atmosphere, at 750 ℃, is incubated 3h, to ooze tank hangs out in stove, close argon gas and vent valve valve simultaneously, to be cooledly to opening below 80 ℃, ooze tank and take out blade, after aluminising silicon completes, with vacuum oven, blade is carried out the secondary ageing diffusion of 900 ℃ * 16h, prepare the aluminising silicon layer that meets design requirements 0.03mm ~ 0.04mm.
Described ethanolic soln is that mass percent is 70% aqueous ethanolic solution.
Pattern to aluminising silicon layer detects, blade passage smooth surface, the consistent gray of color even, and non-scale, tenon oozes without leakage, and pore is without obstruction.
By scanning electron microscope, the Cross Section Morphology of aluminising silicon layer is detected as shown in Figure 4, aluminising silicon layer divides two outer layers and diffusion layer.Outermost layer aluminium content 19% left and right, silicone content only has 8% left and right, and aluminium element ecto-entad reduces gradually, and its skin is mainly β-NiAl phase, and diffusion layer is mainly the Carbide Phases of chromium, has slowed down surfaces of aluminum atom to alloy substrate internal divergence.According to the chemical composition analysis in infiltration layer, outside surface can significantly improve the anti-oxidant and corrosion resistance of matrix.Aluminising silicon layer is remarkable to blade body material protection effect after testing, and blade resistance of oxidation improves approximately 2 times than matrix, and corrosion resistance improves approximately 15 times, has extended the work-ing life of blade.
embodiment 4
A slip type aluminising silicon means of defence for DD6 single crystal super alloy blade, carries out according to following steps:
(1) slip configuration
The silica flour of the Nickel Aluminium Alloy Powder of mass percent 30% and 70% is mixed, then add the ammonium chloride of above-mentioned two kinds of powder total masses 3%, above three kinds of powder are put into ball grinder and carry out making penetration enhancer after ball milling, roasting;
By the 2:9 mixing by volume of polyvinyl alcohol, water, after stirring, add ethanolic soln dilution, make binding agent;
Add ethanolic soln volume be polyvinyl alcohol, aqueous solution volume 1.5 times;
Again penetration enhancer, binding agent, ethanolic soln are mixed and made into slip; Wherein the volume ratio of the quality of penetration enhancer and binding agent, ethanolic soln is 100g:30ml:100ml ratio;
(2) aluminising silicon
DD6 single crystal super alloy low-pressure turbine working-blade surface is used after acetone cleaning, drying, with the non-surface of oozing of high temperature gummed tape protection, then utilize spray gun that the slip configuring is evenly sprayed to blade passage surface, after spraying at drying in oven 2h, blade is contained in to oozing in tank of aluminising silicon stove and in argon gas atmosphere, at 700 ℃, is incubated 2h, to ooze tank hangs out in stove, close argon gas and vent valve valve simultaneously, to be cooledly to opening below 80 ℃, ooze tank and take out blade, after aluminising silicon completes, with vacuum oven, blade is carried out the secondary ageing diffusion of 900 ℃ * 16h, prepare the aluminising silicon layer that meets design requirements 0.02mm ~ 0.03mm.
Described ethanolic soln is that mass percent is 70% aqueous ethanolic solution.
Pattern to aluminising silicon layer detects, blade passage smooth surface, the consistent gray of color even, and non-scale, tenon oozes without leakage, and pore is without obstruction.
Cross Section Morphology to aluminising silicon layer detects, and aluminising silicon layer divides two outer layers and diffusion layer.Outermost layer aluminium content 16% left and right, silicone content only has 9% left and right, and aluminium element ecto-entad reduces gradually, and its skin is mainly β-NiAl phase, and diffusion layer is mainly the Carbide Phases of chromium, has slowed down surfaces of aluminum atom to alloy substrate internal divergence.According to the chemical composition analysis in infiltration layer, outside surface can significantly improve the anti-oxidant and corrosion resistance of matrix.Aluminising silicon layer is remarkable to blade body material protection effect after testing, and blade resistance of oxidation improves approximately 2 times than matrix, and corrosion resistance improves approximately 15 times, has extended the work-ing life of blade.
Claims (2)
1. a slip type aluminising silicon means of defence for DD6 single crystal super alloy blade, is characterized in that carrying out according to following steps:
(1) slip configuration
The silica flour of the Nickel Aluminium Alloy Powder of mass percent 20～30% and 70 ~ 80% is mixed, then add the ammonium chloride of above-mentioned two kinds of powder total masses 3～5%, above three kinds of powder are put into ball grinder and carry out making penetration enhancer after ball milling, roasting;
By the 2:9 mixing by volume of polyvinyl alcohol, water, after stirring, add ethanolic soln dilution, make binding agent;
Add ethanolic soln volume be polyvinyl alcohol, aqueous solution volume 1.5 times;
Again penetration enhancer, binding agent, ethanolic soln are mixed and made into slip; Wherein the volume ratio of the quality of penetration enhancer and binding agent, ethanolic soln is 100g:30ml:100ml ratio;
(2) aluminising silicon
DD6 single crystal super alloy low-pressure turbine working-blade surface is used after acetone cleaning, drying, with the non-surface of oozing of high temperature gummed tape protection, then utilize spray gun that the slip configuring is evenly sprayed to blade passage surface, after spraying at drying in oven 2h, blade is contained in to oozing in tank of aluminising silicon stove, in argon gas atmosphere, at 700～750 ℃, be incubated 2～3h, to ooze tank hangs out in stove, close argon gas and vent valve valve simultaneously, to be cooledly to opening below 80 ℃, ooze tank and take out blade, after aluminising silicon completes, with vacuum oven, blade is carried out the secondary ageing diffusion of 900 ℃ * 16h, prepare the aluminising silicon layer that meets design requirements 0.02 ~ 0.04mm.
2. the slip type aluminising silicon means of defence of a kind of DD6 single crystal super alloy blade according to claim 1, is characterized in that described ethanolic soln is that mass percent is 70% aqueous ethanolic solution.
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Cited By (7)
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| CN105385985A (en) * | 2015-11-20 | 2016-03-09 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for manufacturing penetration layer for improving high-temperature-oxidation resistance of K444 alloy |
| CN107937882A (en) * | 2017-11-29 | 2018-04-20 | 无锡透平叶片有限公司 | A kind of method of the chemical vapor deposition Al Si of turbo blade |
| CN110102422A (en) * | 2019-04-30 | 2019-08-09 | 中国航发南方工业有限公司 | Blade sprays Protecting clamping apparatus, blade sprays means of defence |
| CN111424232A (en) * | 2020-03-31 | 2020-07-17 | 中国航发动力股份有限公司 | Preparation method and application of penetrating agent for slurry aluminizing |
| CN112323066A (en) * | 2020-09-21 | 2021-02-05 | 中国航发沈阳黎明航空发动机有限责任公司 | Preparation method of diffusion barrier layer suitable for large-scale component |
| CN113996516A (en) * | 2021-11-10 | 2022-02-01 | 中国航发南方工业有限公司 | Construction process of environment-friendly organic aluminum-chromium-infiltrated slurry |
| CN114472890A (en) * | 2020-11-13 | 2022-05-13 | 盖瑞特交通一公司 | Method for combined sintering and surface treatment of variable geometry turbocharger vanes |
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| CN105385985A (en) * | 2015-11-20 | 2016-03-09 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for manufacturing penetration layer for improving high-temperature-oxidation resistance of K444 alloy |
| CN105385985B (en) * | 2015-11-20 | 2018-07-27 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of infiltration layer preparation method improving K444 alloy high temperature oxidation resistances |
| CN107937882A (en) * | 2017-11-29 | 2018-04-20 | 无锡透平叶片有限公司 | A kind of method of the chemical vapor deposition Al Si of turbo blade |
| CN110102422A (en) * | 2019-04-30 | 2019-08-09 | 中国航发南方工业有限公司 | Blade sprays Protecting clamping apparatus, blade sprays means of defence |
| CN111424232A (en) * | 2020-03-31 | 2020-07-17 | 中国航发动力股份有限公司 | Preparation method and application of penetrating agent for slurry aluminizing |
| CN111424232B (en) * | 2020-03-31 | 2022-05-03 | 中国航发动力股份有限公司 | Preparation method and application of penetrating agent for slurry aluminizing |
| CN112323066A (en) * | 2020-09-21 | 2021-02-05 | 中国航发沈阳黎明航空发动机有限责任公司 | Preparation method of diffusion barrier layer suitable for large-scale component |
| CN114472890A (en) * | 2020-11-13 | 2022-05-13 | 盖瑞特交通一公司 | Method for combined sintering and surface treatment of variable geometry turbocharger vanes |
| CN113996516A (en) * | 2021-11-10 | 2022-02-01 | 中国航发南方工业有限公司 | Construction process of environment-friendly organic aluminum-chromium-infiltrated slurry |
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