CN114032494A - Slurry aluminizing method for turbine guide device - Google Patents

Slurry aluminizing method for turbine guide device Download PDF

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Publication number
CN114032494A
CN114032494A CN202111347616.2A CN202111347616A CN114032494A CN 114032494 A CN114032494 A CN 114032494A CN 202111347616 A CN202111347616 A CN 202111347616A CN 114032494 A CN114032494 A CN 114032494A
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China
Prior art keywords
slurry
aluminizing
turbine
aluminized
spraying
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CN202111347616.2A
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Chinese (zh)
Inventor
丛丽杰
代德美
王永占
潘柳成
欧婷
刘波
何莉
尹邹凯
潘东华
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AECC Guizhou Liyang Aviation Power Co Ltd
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AECC Guizhou Liyang Aviation Power Co Ltd
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Priority to CN202111347616.2A priority Critical patent/CN114032494A/en
Publication of CN114032494A publication Critical patent/CN114032494A/en
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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
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
    • C23C10/30—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes using a layer of powder or paste on the surface
    • 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
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/04—Diffusion into selected surface areas, e.g. using masks
    • 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
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/60—After-treatment

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)

Abstract

A slurry aluminizing method for a turbine guider is characterized in that uniform slurry is obtained through ball milling and stirring; protecting the non-aluminized surface by an adhesive tape or a special fixture; activating the aluminized surface and improving the binding force between the aluminized surface and the slurry through sand blowing; spraying and drying for multiple times to obtain a uniform slurry layer with a certain thickness; obtaining an aluminized layer on the surface to be aluminized of the part by a vacuum aluminizing technology; and finally, cleaning residues and dust on the aluminized surface of the part by using compressed air or sand blowing. The invention adopts the finished product slurry which can be repeatedly used, effectively reduces the waste phenomenon generated by preparing the slurry, and can obtain the high-quality aluminized layer with uniform and continuous infiltrated layer through mass production verification, and the surface of the part has no phenomena of sintering, falling off and the like.

Description

Slurry aluminizing method for turbine guide device
Technical Field
The invention belongs to the technical field of machining of parts of aero-engines, and particularly relates to a slurry aluminizing method for a turbine guider.
Background
A certain low-pressure turbine guider in the aircraft engine is a brazing combined part, and due to structural characteristics and use requirements, designated parts of the part need to be aluminized, and only a slurry aluminizing technology can be adopted. At present, the aluminized slurry used in the slurry aluminizing technology is mostly prepared on site, and after the aluminizing is finished, the residual slurry cannot be reused, so that a great deal of waste is caused. Meanwhile, when the aluminizing temperature is high, the brazing quality of the part is affected, and the phenomenon of weld joint cracking is caused. In addition, the slurry aluminizing quality is unstable, and the phenomena of sintering, falling, large fluctuation of aluminized layers, breaking points and the like are easy to occur. Therefore, it is desirable to provide a slurry aluminizing process that can obtain an aluminized layer of high quality.
Disclosure of Invention
In order to solve the technical problem, the invention provides a slurry aluminizing method for a turbine guider.
The invention is realized by the following technical scheme.
The invention provides a slurry aluminizing method for a turbine guider, which is characterized by comprising the following steps of:
step one, preparing slurry: putting the aluminized slurry into a ball milling tank for ball milling, wherein the first ball milling time is as follows: 3-4 h, and the subsequent ball milling time: 2h +/-30 min; step two, blowing sand: wrapping the non-aluminized part of the turbine guider by using an adhesive tape, then blowing sand on the surface of the turbine guider by using white corundum, removing the protective adhesive tape after the sand blowing is finished, and scrubbing the sand-blown surface of the part; step three, slurry spraying: make itWrap up the non-spraying surface of turbine director with pressure sensitive adhesive tape, use the even ground paste spraying after the stirring afterwards to wait the aluminizing surface at the turbine director, the spraying number of times is 8 ~ 16, need dry to the part after spraying at every turn, and drying temperature is 130 +/-20 ℃, and the stoving time: not less than 10 min; after finishing, drying the turbine guider at high temperature, wherein the drying temperature is 330 +/-20 ℃, and the drying time is more than 30 min; step four, vacuum aluminizing: putting the turbine guider into a vacuum furnace, vacuumizing to less than or equal to 6.65 multiplied by 10﹣1Pa, opening the furnace and heating, uniformly raising the temperature to 950 +/-10 ℃ within 2h +/-10 min, then keeping the temperature at 950 +/-10 ℃, maintaining for 6-10 h, then cooling the temperature to 500 ℃ at a cooling speed of not more than 10 ℃ per minute, then filling argon into the furnace, then cooling to 150 ℃ and discharging; step five, cleaning: and (3) cleaning residual slag and dust on the surface of the turbine guide by using compressed air, and completing slurry aluminizing of the turbine guide.
Further, in the second step, when sand blowing is performed, the used wind pressure is 0.3-0.6 MPa, and the sand blowing distance is 10-30 cm.
Further, when sand blowing is carried out in the second step, white corundum with the grain size of 120-150 meshes is used.
Further, in the first step, after the preparation of the slurry is completed, the slurry needs to be placed in a refrigerator for storage, and the refrigeration temperature is 0-15 ℃.
Further, in the second step, when the sand blasting surface is scrubbed, the cleaning agent is any one of alcohol and acetone.
Further, in the third step, the thickness of single spraying is less than or equal to 0.02mm, and when the spraying thickness reaches 0.012-0.018 mm, the spraying is stopped, and the next step is carried out.
And further, after the fifth step, the method also comprises the inspection of the turbine guide, the surface aluminizing quality of the turbine guide is visually checked, the aluminized surface is required to have no sintering, falling and other phenomena, and then the depth of the aluminized layer of the furnace sample is detected by a metallographic method, and the depth of the aluminized layer is required to be 20-60 mu m.
Further, in the fourth step, when argon is filled into the furnace, the pressure in the furnace reaches 0.2-0.4 MPa.
The invention has the beneficial effects that: the slurry aluminizing method provided by the invention obtains a slurry layer with a certain thickness and uniformity through multiple spraying and drying; obtaining an aluminized layer on the surface to be aluminized of the part by a vacuum aluminizing technology; and finally, cleaning residues and dust on the aluminized surface of the part by using compressed air or sand blowing, wherein the finished product slurry is adopted and can be repeatedly used, so that the waste phenomenon generated by preparing the slurry is effectively reduced, and mass production verifies that the high-quality aluminized layer with uniform and continuous aluminized layer can be obtained by the method disclosed by the invention, and the surface of the part has no phenomena of sintering, falling and the like.
Drawings
FIG. 1 is a schematic view showing a heating curve in the case of performing vacuum alumetizing according to the present invention.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
Material for aluminized part of certain turbine guide: k403 and GH4648, the depth of aluminized layer requires: 20-60 μm) by the following steps:
firstly, preparing production. Placing AC-200 aluminized slurry produced by the Hunan Xinghong new material science and technology limited company into a ball milling tank for ball milling, wherein the ball milling time is proper and is short: the slurry is not uniform, the ball milling time is too long: affecting the slurry activity. When not in use, the slurry needs to be stored at low temperature. Specifically, the AC-200 aluminized slurry produced by the new material science and technology limited of Hunan Xinhong is put into a ball milling tank for ball milling, and the first ball milling time is as follows: (3-4) h, and the subsequent ball milling time: 2h +/-30 min, and when the slurry is not used, the slurry needs to be stored in a refrigerated cabinet at the temperature of 0-15 ℃.
Secondly, blowing sand. Before sand blowing, an adhesive tape or a special clamp is needed to protect the non-aluminized part of the part. The white corundum is adopted to blow sand on the surface of the part, under a certain condition, along with the increase of the number of sand blowing meshes, the roughness of the surface of the part is reduced, the fluctuation of an aluminized layer is reduced, the binding force between the surface of the part and a slurry layer is reduced, and the probability of the falling phenomenon on the surface of the part is increased. Through tests, sand of 80-240 meshes is adopted for sand blowing. After the sand blowing is finished, the sand blowing surface needs to be cleaned by using a cleaning agent, so that the aluminum aluminizing layer is prevented from being discontinuous and discontinuous due to the residual sand and other pollutants on the surface of the part. During specific implementation, the (120-150) mesh white corundum is adopted to blow sand on the surface of the part, and the air pressure is as follows: (0.3-0.6) MPa, sand blowing distance: (10-30) cm. And after the sand blowing is finished, removing the protective adhesive tape, and scrubbing the sand blowing surface of the part by using alcohol or acetone.
Thirdly, spraying slurry. And uniformly spraying the uniformly stirred slurry on the surface to be aluminized of the part by using a spray gun, drying the part after each spraying to remove water and solvent in the slurry layer, wherein the thickness of each spraying is thinner, and the uniform slurry layer is obtained through multiple spraying and drying. The slurry spraying state has a direct relation with the aluminized layer quality. The slurry spraying thickness directly influences the depth of a slurry aluminized layer, the thickness of the slurry aluminized layer is determined by aluminizing requirements and test conditions, and the spraying thickness can be controlled by a measurement or weight increasing method. During specific operation, a pressure sensitive adhesive tape is used for protecting the non-spraying surface of the part before spraying. The evenly stirred slurry is evenly sprayed on the surface to be aluminized of the part by using a spray gun, and the single spraying thickness is required: less than or equal to 0.02mm, need dry the part after spraying every time, stoving temperature: (130 +/-20) DEG C, drying time: more than or equal to 10min, spraying times: (8-16) times, when the spraying thickness of the part is: and (0.012-0.018) mm, stopping spraying. After the spraying is finished, the protective appliance is detached, and the coating is dried at the high temperature of (330 +/-20) DEG C for the drying time: not less than 30 min.
Fourthly, aluminizing in vacuum. Placing the part into a vacuum furnace, vacuumizing to be less than or equal to 6.65 multiplied by 10 < -1 > Pa, aluminizing according to a heating curve shown in figure 1, namely uniformly raising the temperature to 950 +/-10 ℃ within 2h +/-10 min, then keeping the temperature at 950 +/-10 ℃, maintaining for 6-10 h, then cooling the temperature to 500 ℃ at a cooling speed of not more than 10 ℃ per minute, then filling argon into the furnace, then cooling to 150 ℃, and then discharging from the furnace.
Fifthly, cleaning. And cleaning residual residues and dust on the aluminized surface by using compressed air.
And sixthly, checking. The aluminizing quality of the surface of the part is visually checked, and the aluminizing surface is required to have no sintering, falling and other phenomena. The depth of the aluminized layer of the furnace sample is detected by a metallographic method, and the depth of the aluminized layer is required to be 20-60 mu m when the detection is carried out by using a same furnace test piece.
The invention adopts finished product slurry (AC-200 aluminized slurry produced by Hunan Xinghong new material science and technology limited company) for aluminizing, and the slurry can be repeatedly used, so that the waste phenomenon generated by preparing the slurry can be effectively reduced. Through mass production verification, a high-quality aluminized layer with uniform and continuous infiltrated layer can be obtained through process control, and the surface of the part has no sintering, falling and other phenomena.

Claims (8)

1. A slurry aluminizing method for a turbine nozzle, characterized by comprising the steps of:
step one, preparing slurry: putting the aluminized slurry into a ball milling tank for ball milling, wherein the first ball milling time is as follows: 3-4 h, and the subsequent ball milling time: 2h +/-30 min;
step two, blowing sand: wrapping the non-aluminized part of the turbine guider by using an adhesive tape, then blowing sand on the surface of the turbine guider by using white corundum, removing the protective adhesive tape after the sand blowing is finished, and scrubbing the sand-blown surface of the part;
step three, slurry spraying: wrapping the non-spraying surface of the turbine guider by using a pressure sensitive adhesive tape, and then uniformly spraying the uniformly stirred slurry on the surface to be aluminized of the turbine guider for 8-16 times, wherein the part needs to be dried after each spraying, the drying temperature is 130 +/-20 ℃, and the drying time is more than 10 min; after finishing, drying the turbine guider at high temperature, wherein the drying temperature is 330 +/-20 ℃, and the drying time is more than 30 min;
step four, vacuum aluminizing: putting the turbine guider into a vacuum furnace, vacuumizing to less than or equal to 6.65 multiplied by 10﹣1Pa, opening the furnace and heating, uniformly raising the temperature to 950 +/-10 ℃ within 2h +/-10 min, then keeping the temperature at 950 +/-10 ℃, maintaining for 6-10 h, then cooling the temperature to 500 ℃ at a cooling speed of not more than 10 ℃ per minute, then filling argon into the furnace, then cooling to 150 ℃ and discharging;
step five, cleaning: and (3) cleaning residual slag and dust on the surface of the turbine guide by using compressed air, and completing slurry aluminizing of the turbine guide.
2. The slurry aluminizing method for a turbine nozzle as recited in claim 1, wherein: in the second step, when sand blowing is carried out, the used wind pressure is 0.3-0.6 MPa, and the sand blowing distance is 10-30 cm.
3. The slurry aluminizing method for a turbine nozzle as recited in claim 1, wherein: and when sand blowing is carried out in the second step, white corundum with the particle size of 120-150 meshes is used.
4. The slurry aluminizing method for a turbine nozzle as recited in claim 1, wherein: in the first step, after the preparation of the slurry is finished, the slurry needs to be placed in a refrigerator for storage, and the refrigeration temperature is 0-15 ℃.
5. The slurry aluminizing method for a turbine nozzle as recited in claim 1, wherein: in the second step, when the sand blowing surface is scrubbed, the cleaning agent is any one of alcohol and acetone.
6. The slurry aluminizing method for a turbine nozzle as recited in claim 1, wherein: in the third step, the thickness of single spraying is less than or equal to 0.02mm, and when the spraying thickness reaches 0.012-0.018 mm, the spraying is stopped, and the next step is carried out.
7. The slurry aluminizing method for a turbine nozzle as recited in claim 1, wherein: and after the fifth step, the method also comprises the inspection of the turbine guide, the aluminizing quality of the surface of the turbine guide is visually checked, the aluminizing surface is required to have no sintering, falling and other phenomena, and then the depth of the aluminizing layer of the furnace sample is detected by a metallographic method, and the depth of the aluminizing layer is required to be 20-60 mu m.
8. The slurry aluminizing method for a turbine nozzle as recited in claim 1, wherein: in the fourth step, when argon is filled into the furnace, the pressure in the furnace reaches 0.2-0.4 MPa.
CN202111347616.2A 2021-11-15 2021-11-15 Slurry aluminizing method for turbine guide device Pending CN114032494A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040109948A1 (en) * 2002-12-04 2004-06-10 General Electric Company Aluminide coating process
US20060141283A1 (en) * 2004-12-29 2006-06-29 Honeywell International, Inc. Low cost inovative diffused MCrAIY coatings
CN102936713A (en) * 2012-11-28 2013-02-20 中国南方航空工业(集团)有限公司 Method for seeping aluminum silicon from aluminum silicon slurry
CN103589992A (en) * 2013-11-15 2014-02-19 西安航空动力股份有限公司 Aluminized silicon slurry and method for preparing aluminum-silicon permeated layer on surface of turbine blade
CN109295412A (en) * 2018-10-17 2019-02-01 中国航发航空科技股份有限公司 A kind of aero-engine high temperature alloy slurry process aluminizing method
CN112695271A (en) * 2020-12-22 2021-04-23 中南大学 Method for aluminizing chromium on surface of nickel-based superalloy for turbine blade or vane

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040109948A1 (en) * 2002-12-04 2004-06-10 General Electric Company Aluminide coating process
US20060141283A1 (en) * 2004-12-29 2006-06-29 Honeywell International, Inc. Low cost inovative diffused MCrAIY coatings
CN102936713A (en) * 2012-11-28 2013-02-20 中国南方航空工业(集团)有限公司 Method for seeping aluminum silicon from aluminum silicon slurry
CN103589992A (en) * 2013-11-15 2014-02-19 西安航空动力股份有限公司 Aluminized silicon slurry and method for preparing aluminum-silicon permeated layer on surface of turbine blade
CN109295412A (en) * 2018-10-17 2019-02-01 中国航发航空科技股份有限公司 A kind of aero-engine high temperature alloy slurry process aluminizing method
CN112695271A (en) * 2020-12-22 2021-04-23 中南大学 Method for aluminizing chromium on surface of nickel-based superalloy for turbine blade or vane

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