CN108517483A - A kind of method of tungsten carbide coating reparation - Google Patents
A kind of method of tungsten carbide coating reparation Download PDFInfo
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- CN108517483A CN108517483A CN201810370368.5A CN201810370368A CN108517483A CN 108517483 A CN108517483 A CN 108517483A CN 201810370368 A CN201810370368 A CN 201810370368A CN 108517483 A CN108517483 A CN 108517483A
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- coating
- tungsten carbide
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/18—After-treatment
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F3/00—Electrolytic etching or polishing
- C25F3/02—Etching
- C25F3/04—Etching of light metals
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Electrochemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Coating By Spraying Or Casting (AREA)
- Golf Clubs (AREA)
Abstract
The present invention relates to a kind of methods of tungsten carbide coating reparation, it is mechanically and chemically removed by the coating to repair piece, then flame-spraying is carried out, and it is processed after spraying, complete reprocessing for part, each step parameter is reasonable, it is easy to operate, it is good to reprocess effect, it ensure that the cylindricity of part is less than 0.02mm, roughness is less than Ra0.8, coating layer thickness is the requirement that 0.3mm and position of positioning hole degree are less than 0.02mm, and part coating surface should be complete, it is fine and close, color uniformity, flawless, it peels off, layering, the defects of edge tilts, meet the requirement of helicopter.
Description
Technical field
The present invention relates to a kind of coating recovery technique, especially a kind of method of tungsten carbide coating reparation.
Background technology
Commonly using tube kind part is led to a kind of aluminium alloy in Helicopter Tail Drive System system, as shown in Figure 1, being provided with three on guide tube
A location hole is coated with one layer of tungsten carbide coating in guide tube outer surface and plays wear-resisting damping effect.After working long hours, coating meeting
It is damaged, is repaired.In order to ensure the normal use of helicopter, the aluminium alloy guide tube after repairing is needed to reach one
Fixed required precision, i.e. cylindricity are less than 0.02mm, roughness is less than Ra0.8, coating layer thickness is 0.3mm and position of positioning hole
Requirement of the degree less than 0.02mm, and part coating surface answers complete, fine and close, color uniformity, flawless, peeling, layering, side
The defects of edge tilts.Ripe technology there is no to ensure These parameters requirement at present.
Invention content
The object of the present invention is to provide a kind of method that tungsten carbide coating part is reprocessed, this method can not destroy part body
Under the premise of, tungsten carbide coating is removed and is sprayed again, the requirement of helicopter is reached, i.e., after guide tube is repaired, part
Cylindricity is less than 0.02mm, roughness is less than Ra0.8, coating layer thickness is 0.3mm and position of positioning hole degree is less than 0.02mm's
It is required that and part coating surface should complete, fine and close, color uniformity, the defects of flawless, peeling, layering, edge tilt.
The present invention is technical solution, and the method includes the following steps：
(1) removal of coating
A) part is filled on plain external grinding machine, the bounce of centering tungsten carbide coating outer diameter is not more than 0.02mm, is ground part carbon
Changing tungsten coating to part has 1/4 above section surface to expose body；
B) remaining tungsten carbide coating is removed by Conventional electrochemical mode；
(2) spraying of coating
A) surface cleaning：Remove grease with acetone or gasoline scrub-up piece surface, wipes 3-5 times；
B) blasting treatment：Sandblasting carries out surface sand-blasting using 24# fused alumina zirconias, and pressure 0.28-0.32MPa is sprayed away from 120-150mm,
15 ° -45 ° of angle, stops after sandblasting to surface roughness Ra 4.2-5.2；
C) supersonic flame spraying：Using preceding that dusty spray baking oven is 1-2 hours dry with 80-100 DEG C, flame is then carried out
Spraying, after thickness reaches requirement, first stops powder feeding, then stop rifle, spray parameters are：
Coating material：DTS W484-25/5
Coating composition：WC-14Co
Compressed air：84-87PSI
Compressed air inlet pressure：100-130PSI
Hydrogen inlet pressure：100-120PSI
Fuel gas inlet pressure：110-140PSI
Nitrogen inlet pressure：150-180PSI
Turntable rotating speed：190-200rpm
Spray gun spray away from：170-175mm
Movement speed：10-11mm/s
Workpiece temperature：Less than 100 DEG C
Spray gun and workpiece surface angle：45-435 degree
Coating thickness：0.3-0.5mm
(3) tungsten carbide coating is processed
A) part is cleared up：Part mating surface, location hole are slightly cleared up using polishing cotton cooperation acetone, cleaning to piece surface
Without visible dirt；Then cotton cooperation acetone is used to carry out seminal plasma reason to part, cleaning without dirt, that is, is used clean to piece surface
Cotton wiping after, cotton noresidue dirt；
B) auxiliary mould makes, and designs and process three positioning pins, and the positioning pin is that ladder determines positioning pin, the cooperation with hole
Precision is not more than 0.005mm, and two sections of outer diameters of ladder pin are coaxially not more than 0.001mm；
C) it is ground：Three positioning pins are matched with the location hole on part, by the principle of three points centering, centering part is laggard
Row is machined to predetermined size；
(4) final inspection
A) appearance：Accessory appearance progress 100% is checked, part coating surface answers complete, fine and close, color uniformity, nothing to split
The defects of line, peeling, layering, edge tilt；
B) binding force：It is piece surface knife after spraying to check coating and parent metal interface whether to have binding deficient, method
Piece cuts off a coated tape of 7mm around outer diameter, then cuts coating perpendicular to the band, when uncovering coating edge and pulling open, no farad
Coating is played, binding force qualification is considered as；
C) thickness：Coating layer thickness is checked with the size of part after painting, the thickness of coating, which should meet design, to be wanted before being applied by measurement
It asks.
It is described while pair to be sprayed with the test piece of guide tube material identical in the spraying process of coating, then in binding force
In inspection, test piece is cut and is checked, inspection result is considered as the inspection result of part.
In procedure of processing, the correct error deviation of positioning pin is not more than 0.001mm, position error 0.02mm.
Equipment, tooling, coolant liquid and the chemical solution used in the present invention does not react with aluminium alloy, ensure that aluminum alloy organism
Material is unaffected, meanwhile, the purpose of mechanical removal coating is that extra surplus is removed for chemical electrolysis method, and removing coating is removed in raising
Efficiency；Since part is repair piece, the dirt remained on part will have a direct impact on machining accuracy, therefore, it is clear carry out part
It manages very necessary；High accuracy positioning pin is designed and manufactured, the positioning accuracy in process is ensure that, ensure that machining accuracy；
In spraying process, sprayed together with test piece, cut examine when, test piece is operated, can be to avoid after to reparation
Part destroyed, carry out supersonic flame thermal spraying, and using rationally, the technological parameter of science, ensure that the effect of spraying
Fruit and binding force requirement, realize the requirement using function.Through being applied multiple times, the present invention is with obvious effects, ensure that circle after spraying
Column degree is less than 0.02mm, roughness is less than Ra0.8, coating layer thickness is that 0.3mm and position of positioning hole degree are wanted less than 0.02mm
Ask, and part coating surface should complete, fine and close, color uniformity, it is the defects of flawless, peeling, layering, edge tilt, full
The foot requirement of helicopter.
Specific implementation mode
A kind of method that tungsten carbide coating is reprocessed, the method include the following steps：
(1) removal of coating
A) part is filled on plain external grinding machine, the bounce of centering tungsten carbide coating outer diameter is not more than 0.02mm, is ground part carbon
Changing tungsten coating to part has 1/4 above section surface to expose body；
B) remaining tungsten carbide coating is removed by Conventional electrochemical mode；
(2) spraying of coating
A) surface cleaning：Remove grease with acetone or gasoline scrub-up piece surface, wipes 3-5 times；
B) blasting treatment：Sandblasting carries out surface sand-blasting using 24# fused alumina zirconias, and pressure 0.28-0.32MPa is sprayed away from 120-150mm,
15 ° -45 ° of angle, stops after sandblasting to surface roughness Ra 4.2-5.2；
C) supersonic flame spraying：Using preceding that dusty spray baking oven is 1-2 hours dry with 80-100 DEG C, flame is then carried out
Spraying, after thickness reaches requirement, first stops powder feeding, then stop rifle, spray parameters are：
Coating material：DTS W484-25/5
Coating composition：WC-14Co
Compressed air：84-87PSI
Compressed air inlet pressure：100-130PSI
Hydrogen inlet pressure：100-120PSI
Fuel gas inlet pressure：110-140PSI
Nitrogen inlet pressure：150-180PSI
Turntable rotating speed：190-200rpm
Spray gun spray away from：170-175mm
Movement speed：10-11mm/s
Workpiece temperature：Less than 100 DEG C
Spray gun and workpiece surface angle：45-435 degree
Coating thickness：0.3-0.5mm
(3) tungsten carbide coating is processed
A) part is cleared up：Part mating surface, location hole are slightly cleared up using polishing cotton cooperation acetone, cleaning to piece surface
Without visible dirt；Then cotton cooperation acetone is used to carry out seminal plasma reason to part, cleaning without dirt, that is, is used clean to piece surface
Cotton wiping after, cotton noresidue dirt；
B) auxiliary mould makes, and designs and process three positioning pins, and the positioning pin is that ladder determines positioning pin, the cooperation with hole
Precision is not more than 0.005mm, and two sections of outer diameters of ladder pin are coaxially not more than 0.001mm；
C) it is ground：Three positioning pins are matched with the location hole on part, by the principle of three points centering, centering part is laggard
Row is machined to predetermined size；
(4) final inspection
A) appearance：Accessory appearance progress 100% is checked, part coating surface answers complete, fine and close, color uniformity, nothing to split
The defects of line, peeling, layering, edge tilt；
B) binding force：It is piece surface knife after spraying to check coating and parent metal interface whether to have binding deficient, method
Piece cuts off a coated tape of 7mm around outer diameter, then cuts coating perpendicular to the band, when uncovering coating edge and pulling open, no farad
Coating is played, binding force qualification is considered as；
C) thickness：Coating layer thickness is checked with the size of part after painting, the thickness of coating, which should meet design, to be wanted before being applied by measurement
It asks.
It is described while pair to be sprayed with the test piece of guide tube material identical in the spraying process of coating, then in binding force
In inspection, test piece is cut and is checked, inspection result is considered as the inspection result of part.
In procedure of processing, the correct error deviation of positioning pin is not more than 0.001mm, position error 0.02mm.
Embodiment
Certain helicopter auto-bank unit guide tube, the blistering of discovery surface tungsten carbide coating, can not be used when reprocessing inspection,
Need to place under repair, it is desirable that after repairing part cylindricity be less than 0.02mm, roughness be less than Ra0.8, coating layer thickness be 0.3mm with
And position of positioning hole degree is less than the requirement of 0.02mm, while part coating surface answers complete, fine and close, color uniformity, nothing to split
The defects of line, peeling, layering, edge tilt, specific implementation process is as follows：
(1) removal of coating
A) part is filled on plain external grinding machine, centering tungsten carbide coating outer diameter, until jerk value is 0.01mm, is ground part carbon
Changing tungsten coating to part has 1/3 surface to expose body；
B) remaining tungsten carbide coating is removed by Conventional electrochemical mode；
(2) spraying of coating
A) surface cleaning：Remove grease with acetone or gasoline scrub-up piece surface, wipes 5 times；
B) blasting treatment：Sandblasting carries out surface sand-blasting using 24# fused alumina zirconias, and pressure 0.3MPa, spray is away from 140mm, 30 ° of angle, spray
Stop after sand to surface roughness Ra 4.2-5.2；
C) supersonic flame spraying：Dusty spray baking oven is dried 2 hours with 100 DEG C using preceding, then carries out flame-spraying,
The degree piece of same material is sprayed together while spraying, after thickness reaches requirement, first stops powder feeding, then stop rifle, spray parameters are：
Coating material：DTS W484-25/5
Coating composition：WC-14Co
Compressed air：86PSI
Compressed air inlet pressure：120PSI
Hydrogen inlet pressure：120PSI
Fuel gas inlet pressure：140PSI
Nitrogen inlet pressure：170PSI
Turntable rotating speed：200rpm
Spray gun spray away from：175mm
Movement speed：11mm/s
Workpiece temperature：80℃
Spray gun and workpiece surface angle：90 degree
Coating thickness：0.5mm
(3) tungsten carbide coating is processed
A) part is cleared up：Part mating surface, location hole are slightly cleared up using polishing cotton cooperation acetone, cleaning to piece surface
Without visible dirt；Then cotton cooperation acetone is used to carry out seminal plasma reason to part, cleaning without dirt, that is, is used clean to piece surface
Cotton wiping after, cotton noresidue dirt；
B) auxiliary mould makes, and designs and process three positioning pins, and the positioning pin is that ladder determines positioning pin, the cooperation with hole
Precision is 0.004mm, and two sections of outer diameters of ladder pin are coaxially 0.0008mm；
C) it is ground：Three positioning pins are matched with the location hole on part, by the principle of three points centering, centering part is laggard
Row is machined to predetermined size；Wherein the correct error deviation of positioning pin is 0.001mm, position error 0.02mm.
(4) final inspection
A) appearance：100% being carried out to accessory appearance to check, part coating surface is complete, fine and close, color uniformity, flawless,
The defects of peeling, layering, edge tilt；
B) binding force：It cuts off a coated tape of 7mm around outer diameter with blade in test piece piece surface, is then cut perpendicular to the band
Coating, when uncovering coating edge and pulling open, can not pull-up coating, binding force is qualified；
C) thickness：Coating layer thickness is checked with the size of part after painting, the thickness of coating is 0.03mm before being applied by measurement.
Conclusion：Reprocess qualification.
Claims (3)
1. a kind of method of tungsten carbide coating reparation, which is characterized in that the method includes the following steps
(1) removal of coating
A) part is filled on plain external grinding machine, the bounce of centering tungsten carbide coating outer diameter is not more than 0.02mm, is ground part carbon
Changing tungsten coating to part has 1/4 above section surface to expose body；
B) remaining tungsten carbide coating is removed by Conventional electrochemical mode；
(2) spraying of coating
A) surface cleaning：Remove grease with acetone or gasoline scrub-up piece surface, wipes 3-5 times；
B) blasting treatment：Sandblasting carries out surface sand-blasting using 24# fused alumina zirconias, and pressure 0.28-0.32MPa is sprayed away from 120-150mm,
15 ° -45 ° of angle, stops after sandblasting to surface roughness Ra 4.2-5.2；
C) supersonic flame spraying：Using preceding that dusty spray baking oven is 1-2 hours dry with 80-100 DEG C, flame is then carried out
Spraying, after thickness reaches requirement, first stops powder feeding, then stop rifle, spray parameters are：
Coating material：DTS W484-25/5
Coating composition：WC-14Co
Compressed air：84-87PSI
Compressed air inlet pressure：100-130PSI
Hydrogen inlet pressure：100-120PSI
Fuel gas inlet pressure：110-140PSI
Nitrogen inlet pressure：150-180PSI
Turntable rotating speed：190-200rpm
Spray gun spray away from：170-175mm
Movement speed：10-11mm/s
Workpiece temperature：Less than 100 DEG C
Spray gun and workpiece surface angle：45-435 degree
Coating thickness：0.3-0.5mm
(3) tungsten carbide coating is processed
A) part is cleared up：Part mating surface, location hole are slightly cleared up using polishing cotton cooperation acetone, cleaning to piece surface
Without visible dirt；Then cotton cooperation acetone is used to carry out seminal plasma reason to part, cleaning without dirt, that is, is used clean to piece surface
Cotton wiping after, cotton noresidue dirt；
B) auxiliary mould makes, and designs and process three positioning pins, and the positioning pin is that ladder determines positioning pin, the cooperation with hole
Precision is not more than 0.005mm, and two sections of outer diameters of ladder pin are coaxially not more than 0.001mm；
C) it is ground：Three positioning pins are matched with the location hole on part, by the principle of three points centering, centering part is laggard
Row is machined to predetermined size；
(4) final inspection
A) appearance：Accessory appearance progress 100% is checked, part coating surface answers complete, fine and close, color uniformity, nothing to split
The defects of line, peeling, layering, edge tilt；
B) binding force：It is piece surface knife after spraying to check coating and parent metal interface whether to have binding deficient, method
Piece cuts off a coated tape of 7mm around outer diameter, then cuts coating perpendicular to the band, when uncovering coating edge and pulling open, no farad
Coating is played, binding force qualification is considered as；
C) thickness：Coating layer thickness is checked with the size of part after painting, the thickness of coating, which should meet design, to be wanted before being applied by measurement
It asks.
2. a kind of method of tungsten carbide coating reparation as described in claim 1, which is characterized in that the spraying in coating
In step, while pair being sprayed with the test piece of guide tube material identical, then in binding force inspection, to test piece carry out cutting and
It checks, inspection result is considered as the inspection result of part.
3. a kind of method of tungsten carbide coating reparation as described in claim 1, which is characterized in that in procedure of processing, positioning
The correct error deviation of pin is not more than 0.001mm, position error 0.02mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810370368.5A CN108517483A (en) | 2018-04-23 | 2018-04-23 | A kind of method of tungsten carbide coating reparation |
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| CN201810370368.5A CN108517483A (en) | 2018-04-23 | 2018-04-23 | A kind of method of tungsten carbide coating reparation |
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| CN201810370368.5A Pending CN108517483A (en) | 2018-04-23 | 2018-04-23 | A kind of method of tungsten carbide coating reparation |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109514436A (en) * | 2018-12-12 | 2019-03-26 | 常州大学 | A method of improving coating binding force in the way of sandblasting |
| CN110408881A (en) * | 2019-08-16 | 2019-11-05 | 中国航发北京航空材料研究院 | A kind of tungsten carbide coating post-processing approach |
| CN110936099A (en) * | 2019-11-19 | 2020-03-31 | 中国航发沈阳黎明航空发动机有限责任公司 | Process method for maintaining high-pressure turbine guide pipe |
| CN112064008A (en) * | 2020-09-14 | 2020-12-11 | 水利部杭州机械设计研究所 | Repair method for supersonic spraying hard alloy coating |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109514436A (en) * | 2018-12-12 | 2019-03-26 | 常州大学 | A method of improving coating binding force in the way of sandblasting |
| CN110408881A (en) * | 2019-08-16 | 2019-11-05 | 中国航发北京航空材料研究院 | A kind of tungsten carbide coating post-processing approach |
| CN110936099A (en) * | 2019-11-19 | 2020-03-31 | 中国航发沈阳黎明航空发动机有限责任公司 | Process method for maintaining high-pressure turbine guide pipe |
| CN112064008A (en) * | 2020-09-14 | 2020-12-11 | 水利部杭州机械设计研究所 | Repair method for supersonic spraying hard alloy coating |
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