CN111647885A - Cold spraying repair method for aluminum alloy shell inner hole abrasion - Google Patents
Cold spraying repair method for aluminum alloy shell inner hole abrasion Download PDFInfo
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- CN111647885A CN111647885A CN202010730655.XA CN202010730655A CN111647885A CN 111647885 A CN111647885 A CN 111647885A CN 202010730655 A CN202010730655 A CN 202010730655A CN 111647885 A CN111647885 A CN 111647885A
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- spraying
- inner hole
- spray gun
- aluminum alloy
- cold spraying
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/082—Coating starting from inorganic powder by application of heat or pressure and heat without intermediate formation of a liquid in the layer
- C23C24/085—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
Abstract
The invention relates to the field of aeroengines, in particular to a flexible and reliable cold spraying repairing method for aluminum alloy shell inner hole abrasion, which meets the mechanical property requirement of a repairing layer at the same time, and comprises the following steps: a. mixing Al with Al2O3The powder is evenly mixed according to the volume ratio of 4:1 to prepare Al and Al2O3The composite powder of (1); b. polishing an inner hole to be repaired of the shell by using a pneumatic polishing pen, and polishing the inner hole to be smooth and have metallic luster; c. repairing the polished area by adopting a low-pressure cold spraying method, wherein the spraying angle between a spray gun and a spraying surface is 30 degrees; d. after spraying a layer, adjusting the spraying angle between the spray gun and the spraying surface to 60 degrees for spraying; e. finally, adjusting the spraying angle between the spray gun and the spraying surface to 90 degrees for spraying; f. and grinding the spraying area to finish the abrasion repair after the size requirement of the part is met. The invention is particularly suitable for the process for repairing the abrasion of the inner hole of the aluminum alloy shell.
Description
Technical Field
The invention relates to the field of aeroengines, in particular to a cold spraying repair method for abrasion of an inner hole of an aluminum alloy shell.
Background
For an aircraft engine pump shell cast from aluminum alloy, the matching surface of an inner hole of the aircraft engine pump shell is prone to causing size out-of-tolerance due to fretting wear, and parts are scrapped. Meanwhile, the repair thickness is large (about 1mm) due to the thin wall thickness, and the repair difficulty is large due to the fact that the inner diameter of the part to be repaired is usually small (about 40mm) and the depth is large (greater than 20 mm). The conventional argon arc welding repair mode is adopted, and the argon arc welding cannot meet the size requirement due to large heat input and serious deformation in the welding process. The cold spraying repair process is suitable for aluminum alloy, but the existing high-pressure cold spraying equipment cannot repair due to the limitation of the overall dimension of a spray gun, and the mechanical property of a low-pressure cold spraying repair layer of the equipment cannot meet the requirement.
Disclosure of Invention
The invention aims to solve the technical problem of providing a cold spraying repairing method for the abrasion of an inner hole of an aluminum alloy shell, which is flexible and reliable and meets the mechanical property requirement of a repairing layer.
The technical scheme adopted by the invention for solving the technical problems is as follows: the cold spraying repair method for the wear of the inner hole of the aluminum alloy shell comprises the following steps: a. mixing Al with Al2O3The powder is evenly mixed according to the volume ratio of 4:1 to prepare Al and Al2O3The composite powder of (1); b. polishing an inner hole to be repaired of the shell by using a pneumatic polishing pen, and polishing the inner hole to be smooth and have metallic luster; c. repairing the polished area by adopting a low-pressure cold spraying method, wherein the spraying angle between a spray gun and a spraying surface is 30 degrees; d. after spraying a layer, adjusting the spraying angle between the spray gun and the spraying surface to 60 degrees for spraying; e. finally, the spraying angle between the spray gun and the spraying surface is adjusted to 90 degrees for spraying(ii) a f. And grinding the spraying area to finish the abrasion repair after the size requirement of the part is met.
Further, in the step c, during the low-pressure cold spraying, the parameters of the cold spraying are as follows: the gas source is nitrogen, the inlet temperature of the nitrogen is 400-450 ℃, the pressure is 1.0-2.0 MPa, the powder feeding amount is 5-6 g/min, and the distance between the spray gun and the surface of the substrate is 10-15 mm.
Further, the cold spraying parameters in the step d are as follows: the gas source is nitrogen, the inlet temperature of the nitrogen is 400-450 ℃, the pressure is 1.0-2.0 MPa, the powder feeding amount is 5-6 g/min, and the distance between the spray gun and the surface of the substrate is 10-15 mm.
Further, in step e, the cold spraying parameters are as follows: the gas source is nitrogen, the inlet temperature of the nitrogen is 400-450 ℃, the pressure is 1.0-2.0 MPa, the powder feeding amount is 5-6 g/min, and the distance between the spray gun and the surface of the substrate is 10-15 mm.
The invention has the beneficial effects that: the invention creatively improves the practical condition of repairing the inner hole of the aluminum alloy shell. The low-pressure cold spraying equipment is adopted, so that the spray gun has the characteristics of small overall dimension, better accessibility, flexibility in operation, handholdability and low cost, is particularly suitable for repairing the position with complex molded surface which is difficult to reach, and well meets the requirement of repairing the abrasion of the inner hole of the aluminum alloy shell. Secondly, the composite powder is creatively adopted, the ceramic hard phase is added, the mechanical property of the repairing layer is improved, and meanwhile, the ceramic phase remained in the coating can also play a role in improving the wear resistance. The invention is particularly suitable for the process for repairing the abrasion of the inner hole of the aluminum alloy shell.
Drawings
FIG. 1 is a schematic view of the spray coating of the present invention.
Labeled as: the device comprises a shell 1, a spray gun spraying direction 2 and a spraying angle a.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The cold spraying repair method for the wear of the inner hole of the aluminum alloy shell comprises the following steps: a. mixing Al with Al2O3The powder is evenly mixed according to the volume ratio of 4:1 to prepare Al and Al2O3The composite powder of (1); b. polishing an inner hole to be repaired of the shell by using a pneumatic polishing pen, and polishing the inner hole to be smooth and have metallic luster; c. repairing the polished area by adopting a low-pressure cold spraying method, wherein the spraying angle a between a spray gun and a spraying surface is 30 degrees; d. after spraying a layer, adjusting the spraying angle a between the spray gun and the spraying surface to 60 degrees for spraying; e. finally, adjusting the spraying angle a between the spray gun and the spraying surface to 90 degrees for spraying; f. and grinding the spraying area to finish the abrasion repair after the size requirement of the part is met.
The invention creatively designs the process according to the repairing environmental conditions of the inner hole of the aluminum alloy shell. The low-pressure cold spraying equipment can give full play to the characteristics of small overall dimension, better accessibility, flexible operation, handholdability and low cost of the spray gun, and is particularly suitable for repairing the position of a complex profile which is difficult to reach, thereby really ensuring the requirement of repairing the abrasion of the inner hole of the aluminum alloy shell. In addition, the composite powder is adopted, the ceramic hard phase is added, the mechanical property of the repairing layer is improved, and meanwhile, the ceramic phase remained in the coating can play a role in improving the wear resistance. Meanwhile, when in actual spraying, the spraying angle a of each step period is also ingeniously designed, so that the spraying quality is further improved, the spraying effect is ensured, and a high-density coating with good binding force is finally formed. The principle of the cold spraying is as follows: the addition of a metal or cermet mixed powder to the ultrasonic gas stream is accelerated and then impacted onto the metal surface to form a high density coating with good bonding force.
In order to further improve the spraying quality and thus obtain better spraying effect, the following scheme is preferred: in the step c, when the low-pressure cold spraying is carried out, the parameters of the cold spraying are as follows: the gas source is nitrogen, the inlet temperature of the nitrogen is 400-450 ℃, the pressure is 1.0-2.0 MPa, the powder feeding amount is 5-6 g/min, and the distance between the spray gun and the surface of the substrate is 10-15 mm.
Based on the same design concept, it is preferable that: the cold spraying parameters in the step d are as follows: the gas source is nitrogen, the inlet temperature of the nitrogen is 400-450 ℃, the pressure is 1.0-2.0 MPa, the powder feeding amount is 5-6 g/min, and the distance between the spray gun and the surface of the substrate is 10-15 mm. And in the preferred step e, the cold spraying parameters are as follows: the gas source is nitrogen, the inlet temperature of the nitrogen is 400-450 ℃, the pressure is 1.0-2.0 MPa, the powder feeding amount is 5-6 g/min, and the distance between the spray gun and the surface of the substrate is 10-15 mm.
Examples
The method adopts low-pressure cold spraying composite powder to repair the inner hole of the shell of a certain type of aeroengine, and comprises the following steps:
a. mixing Al with Al2O3The powder is evenly mixed according to the volume ratio of 4:1 to prepare Al and Al2O3The composite powder of (1);
b. polishing an inner hole to be repaired of the shell by using a pneumatic polishing pen, and polishing the inner hole to be smooth and have metallic luster;
c. repairing the polished area by adopting a low-pressure cold spraying method, wherein the spraying angle between a spray gun and a spraying surface is adjusted to 30 degrees, and the cold spraying parameters are as follows: the gas source is nitrogen, the inlet temperature of the nitrogen is 420 ℃, the pressure is 1.5MPa, the powder feeding amount is 5.5g/min, and the distance between the spray gun and the surface of the substrate is 12 mm;
d. after spraying a layer, adjusting the spraying angle between the spray gun and the spraying surface to 60 degrees, wherein the cold spraying parameters are as follows: the gas source is nitrogen, the inlet temperature of the nitrogen is 420 ℃, the pressure is 1.5MPa, the powder feeding amount is 5.5g/min, and the distance between the spray gun and the surface of the substrate is 12 mm;
e. and finally adjusting the spraying angle between the spray gun and the spraying surface to 90 degrees, wherein the cold spraying parameters are as follows: the gas source is nitrogen, the inlet temperature of the nitrogen is 430 ℃, the pressure is 1.5MPa, the powder feeding amount is 5.5g/min, the distance between the spray gun and the surface of the substrate is 12mm, and the moving speed of the spray gun is 2.5 mm/s;
f. and grinding the spraying area to finish the abrasion repair after the size requirement of the part is met.
After the repair, the size of the inner hole of the shell finally meets the corresponding repair requirement. The invention has obvious technical advantages and wide market promotion prospect.
Claims (4)
1. The cold spraying repair method for the abrasion of the inner hole of the aluminum alloy shell is characterized by comprising the following steps of:
a. mixing Al with Al2O3The powder is evenly mixed according to the volume ratio of 4:1 to prepare Al and Al2O3The composite powder of (1);
b. polishing an inner hole to be repaired of the shell by using a pneumatic polishing pen, and polishing the inner hole to be smooth and have metallic luster;
c. repairing the polished area by adopting a low-pressure cold spraying method, wherein the spraying angle (a) between a spray gun and a spraying surface is 30 degrees;
d. after spraying a layer, adjusting the spraying angle (a) between the spray gun and the spraying surface to 60 degrees for spraying;
e. finally, adjusting the spraying angle (a) between the spray gun and the spraying surface to 90 degrees for spraying;
f. and grinding the spraying area to finish the abrasion repair after the size requirement of the part is met.
2. The aluminum alloy shell inner hole abrasion cold spraying repair method as claimed in claim 1, characterized in that: in the step c, when the low-pressure cold spraying is carried out, the parameters of the cold spraying are as follows: the gas source is nitrogen, the inlet temperature of the nitrogen is 400-450 ℃, the pressure is 1.0-2.0 MPa, the powder feeding amount is 5-6 g/min, and the distance between the spray gun and the surface of the substrate is 10-15 mm.
3. The aluminum alloy shell inner bore wear cold spraying repair method of claim 1 or 2, characterized in that: the cold spraying parameters in the step d are as follows: the gas source is nitrogen, the inlet temperature of the nitrogen is 400-450 ℃, the pressure is 1.0-2.0 MPa, the powder feeding amount is 5-6 g/min, and the distance between the spray gun and the surface of the substrate is 10-15 mm.
4. The aluminum alloy shell inner bore wear cold spraying repair method of claim 1 or 2, characterized in that: in step e, the cold spraying parameters are as follows: the gas source is nitrogen, the inlet temperature of the nitrogen is 400-450 ℃, the pressure is 1.0-2.0 MPa, the powder feeding amount is 5-6 g/min, and the distance between the spray gun and the surface of the substrate is 10-15 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010730655.XA CN111647885A (en) | 2020-07-27 | 2020-07-27 | Cold spraying repair method for aluminum alloy shell inner hole abrasion |
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| CN202010730655.XA CN111647885A (en) | 2020-07-27 | 2020-07-27 | Cold spraying repair method for aluminum alloy shell inner hole abrasion |
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| CN111647885A true CN111647885A (en) | 2020-09-11 |
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Citations (6)
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|---|---|---|---|---|
| CN1800447A (en) * | 2004-12-21 | 2006-07-12 | 联合工艺公司 | Structural repair using cold sprayed aluminum materials |
| RU2007113724A (en) * | 2007-04-12 | 2008-10-20 | ФЕДЕРАЛЬНОЕ ГОСУДАРСТВЕННОЕ УНИТАРНОЕ ПРЕДПРИЯТИЕ"ЦЕНТРАЛЬНЫЙ НАУЧНО-ИССЛЕДОВАТЕЛЬСКИЙ ИНСТИТУТ КОНСТРУКЦИОННЫХ МАТЕРИАЛОВ "ПРОМЕТЕЙ" (ФГУП "ЦНИИКМ "Прометей") (RU) | METHOD FOR PRODUCING NANOSTRUCTURED FUNCTIONALLY GRADIENT WEAR-RESISTANT COATINGS |
| WO2011088817A1 (en) * | 2010-01-22 | 2011-07-28 | Mtu Aero Engines Gmbh | Structured surface coating by means of dynamic cold gas spraying |
| CN104894554A (en) * | 2015-04-10 | 2015-09-09 | 西安交通大学 | Preparation method of high density cold spraying metal/metal-based sedimentary body and application thereof |
| CN106591821A (en) * | 2016-10-27 | 2017-04-26 | 中国人民解放军第五七九工厂 | Cold spraying repair method of cavitation erosion pit of booster pump volute |
| CN109972020A (en) * | 2019-03-28 | 2019-07-05 | 中国兵器工业第五九研究所 | A kind of high anti-corrosion composite coating and preparation method thereof |
-
2020
- 2020-07-27 CN CN202010730655.XA patent/CN111647885A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1800447A (en) * | 2004-12-21 | 2006-07-12 | 联合工艺公司 | Structural repair using cold sprayed aluminum materials |
| RU2007113724A (en) * | 2007-04-12 | 2008-10-20 | ФЕДЕРАЛЬНОЕ ГОСУДАРСТВЕННОЕ УНИТАРНОЕ ПРЕДПРИЯТИЕ"ЦЕНТРАЛЬНЫЙ НАУЧНО-ИССЛЕДОВАТЕЛЬСКИЙ ИНСТИТУТ КОНСТРУКЦИОННЫХ МАТЕРИАЛОВ "ПРОМЕТЕЙ" (ФГУП "ЦНИИКМ "Прометей") (RU) | METHOD FOR PRODUCING NANOSTRUCTURED FUNCTIONALLY GRADIENT WEAR-RESISTANT COATINGS |
| WO2011088817A1 (en) * | 2010-01-22 | 2011-07-28 | Mtu Aero Engines Gmbh | Structured surface coating by means of dynamic cold gas spraying |
| CN104894554A (en) * | 2015-04-10 | 2015-09-09 | 西安交通大学 | Preparation method of high density cold spraying metal/metal-based sedimentary body and application thereof |
| CN106591821A (en) * | 2016-10-27 | 2017-04-26 | 中国人民解放军第五七九工厂 | Cold spraying repair method of cavitation erosion pit of booster pump volute |
| CN109972020A (en) * | 2019-03-28 | 2019-07-05 | 中国兵器工业第五九研究所 | A kind of high anti-corrosion composite coating and preparation method thereof |
| CN111020558A (en) * | 2019-03-28 | 2020-04-17 | 中国兵器工业第五九研究所 | Multi-metal composite coating with high bonding strength with substrate and preparation method thereof |
Non-Patent Citations (1)
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| 周新晶等: "粒子材料特性和入射角度对冷喷涂涂层形成的影响", 《第七届中国功能材料及其应用学术会议论文集（第6分册）》 * |
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Application publication date: 20200911 |
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