CN106399901A - Method for spraying SiC-Si-Cr-Mn-Al abrasion-resistant coating on aluminum alloy through high velocity oxygen fuel spraying - Google Patents
Method for spraying SiC-Si-Cr-Mn-Al abrasion-resistant coating on aluminum alloy through high velocity oxygen fuel spraying Download PDFInfo
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- CN106399901A CN106399901A CN201611015378.4A CN201611015378A CN106399901A CN 106399901 A CN106399901 A CN 106399901A CN 201611015378 A CN201611015378 A CN 201611015378A CN 106399901 A CN106399901 A CN 106399901A
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Abstract
The invention discloses a method for spraying Si-Cr-Mn-SiC-Al abrasion-resistant coating on aluminum alloy through high velocity oxygen fuel spraying. The method includes the steps that firstly, an aluminum alloy base material is subjected to sand blasting roughening treatment, and roughness is larger than Ra25; secondly, surface impurities of the aluminum alloy base material subjected to sand blasting roughening treatment are removed; thirdly, composite powder comprising 10wt%-15wt% of Si, 2wt%-6wt% of Cr, 0.5wt%-3wt% of Mn, 0.5wt%-2wt% of SiC and the balance aluminum is mixed uniformly and is blended into material slurry after being ground; fourthly, the surface of the aluminum alloy base material is evenly coated with the material slurry, and drying is performed at 100-140 DEG C; and fifthly, high velocity oxygen fuel spraying is performed on the surface of the aluminum alloy base material subjected to sand blasting roughening by adopting propane gas as fuel, high-pressure oxygen as combustion-supporting gas and nitrogen gas as powder supplying gas, the spraying thickness is 700-800 microns, and the Si-Cr-Mn-SiC-Al abrasion-resistant coating arranged on the surface of the aluminum alloy in a fusion covering manner is obtained. According to the method, by means of high velocity oxygen fuel spraying, the layer of Si-Cr-Mn-SiC-Al abrasion-resistant coating is arranged on the surface of the aluminum alloy in the fusion covering manner, the hardness of the Si-Cr-Mn-SiC-Al abrasion-resistant coating is larger than 305HV<0.2>, and the performance is improved by 5 times or above compared with that of matrix aluminum alloy. The abrasion-resistant performance of the aluminum alloy is greatly improved.
Description
Technical field
The present invention relates to field of material technology, more particularly, to a kind of aluminium alloy HVAF SiC-Si-Cr-Mn-
The method of Al wear-resistant coating.
Background technology
The research that material subject scholar and engineers and technicians are deepened continuously to alumina-base material always, alumina-base material
Modified aluminium alloy and aluminum matrix composite are developed into by traditional cast aluminium alloy gold.Aluminum matrix composite makes the wear-resisting of aluminium alloy
The comprehensive mechanical performance such as property and intensity is to increasing substantially.However, alumina-base material fusing point is low, hardness is low and wear no resistance lack
Fall into still without obtaining basic overcoming, which greatly limits the range of application of aluminium alloy.For many years, in order to overcome aluminum
The deficiency of alloy, the bulk modified and surface modification of aluminium alloy is always the direction that people make great efforts.
HVAF is also referred to as high-velocity oxy-fuel spraying (High Velocity Oxygen Fuel-HVOF).Super
Velocity of sound flame-spraying be gaseous state or liquid fuel are mixed with high pressure oxygen after in specific combustor or nozzle burn, produce
High temperature, the burning flame stream of high speed be used to spray.Because the speed of combustion flame is the several times of velocity of sound, visually in visible flame stream
Bright " Mach section ", thus general HVOF are called HVAF.HVAF is 80 years 20th century
Generation research and development successfully, adopt combustor and the nozzle of particular design from HVAF unlike conventional flame-spraying,
The fuel of driving big flow is simultaneously combustion-supporting with high pressure oxygen, thus obtaining the burning flame stream of flank speed.Using liquid fuel
Spray gun, also referred to as high pressure HVAF (HP-HVOF), its combustion pressure up to 8.2 bars, 7 times of velocities of sound of flame speed with
On.The representative of this kind of product is the JP5000 type HVAF system with aerial kerosene as fuel.
But aluminium alloy is easily oxidized in atmosphere, in Surface Creation layer oxide film.The oxide-film of aluminum alloy surface
Fusing point very, is difficult to melt, and its proportion is bigger than aluminum, thus will sink in the molten bath that HVAF produces,
Formed on interface and be mingled with or pore, affect cladding quality.Want to obtain high-quality coating, just want method to remove as far as possible and deoxygenate
Change film.Remove Al at present2O3Method have Mechanical Method, from slag making element method and synthetic method etc..In this several method, synthetic method is grasped
Make complex, be not suitable with large-scale production application, be mainly limited to laboratory research；Mechanical Method is simple to operate because of it,
Application is wide, but goes oxide film dissolving not thorough, and effect is undesirable；Obtain in the industrial production at present from slag making element method
Successful Application.Therefore aluminum alloy surface carries out the defect that HVAF is also difficult to overcome.
Content of the invention
It is an object of the invention to proposing a kind of aluminium alloy HVAF SiC-Si-Cr-Mn-Al wear-resistant coating
Method, can be greatly improved the anti-wear performance of aluminium alloy.
The earlier application of the present invention proposes one kind, and " a kind of aluminium alloy HVAF Si-Cr-Mn-W-Al is wear-resisting
The method of coating ", it, in one layer of Si-Cr-Mn-W-Al wear-resistant coating of aluminum alloy surface cladding, substantially increases the resistance to of aluminium alloy
Mill performance.But because it adopts W, its processing difficulties, melt blending there is also certain difficulty, and the therefore present invention changes to it
Enter, to find the material replacing W.
For reaching this purpose, the present invention employs the following technical solutions：
A kind of method of aluminium alloy HVAF Si-Cr-Mn-SiC-Al wear-resistant coating, it includes：
(1) by aluminum alloy base material sandblasting roughening treatment, roughness is more than Ra25；
(2) aluminum alloy base material after sandblasting roughening treatment is removed surface impurity；
(3) by the composite powder of 10-15wt%Si, 2-6wt%Cr, 0.5-3wt%Mn, 0.5-2wt%SiC and balance aluminum
Mix homogeneously, is deployed into slip after grinding；
(4) described slip is uniformly coated on aluminum alloy base material surface, is dried at 100-140 DEG C；
(5) propane gas are adopted to be fuel, high pressure oxygen is combustion-supporting gas, nitrogen is powder feeding gas, after sandblasting roughening
Aluminum alloy base material surface carries out HVAF, and during spraying, propane pressure is 0.55-0.7MPa, and flow is 20-30L/
Min, oxygen pressure is 0.65-0.7MPa, and flow is 180-200L/min, and nitrogen pressure is 0.85-1MPa, and flow is 18-
30L/min, coating thickness is 700-800 μm, obtains cladding in the Si-Cr-Mn-SiC-Al wear-resistant coating of aluminum alloy surface.
The present invention passes through HVAF, in one layer of Si-Cr-Mn-SiC-Al wear-resistant coating of aluminum alloy surface cladding,
Its hardness is more than 305HV0.2, improve more than 5 times compared with aluminum matrix alloy performance.Considerably increase the anti-wear performance of aluminium alloy.
Specific embodiment
To further illustrate technical scheme below by specific embodiment.
Embodiment 1
A kind of method of aluminium alloy HVAF Si-Cr-Mn-SiC-Al wear-resistant coating, it includes：
(1) by aluminum alloy base material sandblasting roughening treatment, roughness is more than Ra25；
(2) aluminum alloy base material after sandblasting roughening treatment is removed surface impurity；
(3) by the composite powder mix homogeneously of 10wt%Si, 2wt%Cr, 0.5wt%Mn, 0.5wt%SiC and balance aluminum,
It is deployed into slip after grinding；
(4) described slip is uniformly coated on aluminum alloy base material surface, is dried at 100 DEG C；
(5) propane gas are adopted to be fuel, high pressure oxygen is combustion-supporting gas, nitrogen is powder feeding gas, after sandblasting roughening
Aluminum alloy base material surface carries out HVAF, and during spraying, propane pressure is 0.55MPa, and flow is 20L/min, oxygen
Pressure is 0.65MPa, and flow is 180L/min, and nitrogen pressure is 0.85MPa, and flow is 18L/min, and coating thickness is 700 μm,
Obtain cladding in the Si-Cr-Mn-SiC-Al wear-resistant coating of aluminum alloy surface.
The present invention passes through HVAF, in one layer of Si-Cr-Mn-SiC-Al wear-resistant coating of aluminum alloy surface cladding,
Its hardness is 318HV0.2.
Embodiment 2
A kind of method of aluminium alloy HVAF Si-Cr-Mn-SiC-Al wear-resistant coating, it includes：
(1) by aluminum alloy base material sandblasting roughening treatment, roughness is more than Ra25；
(2) aluminum alloy base material after sandblasting roughening treatment is removed surface impurity；
(3) by the composite powder mix homogeneously of 15wt%Si, 6wt%Cr, 3wt%Mn, 2wt%SiC and balance aluminum, grind
After be deployed into slip；
(4) described slip is uniformly coated on aluminum alloy base material surface, is dried at 140 DEG C；
(5) propane gas are adopted to be fuel, high pressure oxygen is combustion-supporting gas, nitrogen is powder feeding gas, after sandblasting roughening
Aluminum alloy base material surface carries out HVAF, and during spraying, propane pressure is 0.7MPa, and flow is 30L/min, oxygen pressure
Power is 0.7MPa, and flow is 200L/min, and nitrogen pressure is 1MPa, and flow is 30L/min, and coating thickness is 800 μm, is melted
It is overlying on the Si-Cr-Mn-SiC-Al wear-resistant coating of aluminum alloy surface.
The present invention passes through HVAF, in one layer of Si-Cr-Mn-SiC-Al wear-resistant coating of aluminum alloy surface cladding,
Its hardness position 312HV0.2.
Embodiment 3
A kind of method of aluminium alloy HVAF Si-Cr-Mn-SiC-Al wear-resistant coating, it includes：
(1) by aluminum alloy base material sandblasting roughening treatment, roughness is more than Ra25；
(2) aluminum alloy base material after sandblasting roughening treatment is removed surface impurity；
(3) by the composite powder mix homogeneously of 12wt%Si, 4wt%Cr, 1wt%Mn, 1wt%SiC and balance aluminum, grind
After be deployed into slip；
(4) described slip is uniformly coated on aluminum alloy base material surface, is dried at 100 DEG C；
(5) propane gas are adopted to be fuel, high pressure oxygen is combustion-supporting gas, nitrogen is powder feeding gas, after sandblasting roughening
Aluminum alloy base material surface carries out HVAF, and during spraying, propane pressure is 0.65MPa, and flow is 24L/min, oxygen
Pressure is 0.66MPa, and flow is 193L/min, and nitrogen pressure is 0.96MPa, and flow is 22L/min, and coating thickness is 730 μm,
Obtain cladding in the Si-Cr-Mn-SiC-Al wear-resistant coating of aluminum alloy surface.
The present invention passes through HVAF, in one layer of Si-Cr-Mn-SiC-Al wear-resistant coating of aluminum alloy surface cladding,
Its hardness is more than 334HV0.2.
Embodiment 4
A kind of method of aluminium alloy HVAF Si-Cr-Mn-SiC-Al wear-resistant coating, it includes：
(1) by aluminum alloy base material sandblasting roughening treatment, roughness is more than Ra25；
(2) aluminum alloy base material after sandblasting roughening treatment is removed surface impurity；
(3) by the composite powder mix homogeneously of 11wt%Si, 5wt%Cr, 1.6wt%Mn, 0.6wt%SiC and balance aluminum,
It is deployed into slip after grinding；
(4) described slip is uniformly coated on aluminum alloy base material surface, is dried at 110 DEG C；
(5) propane gas are adopted to be fuel, high pressure oxygen is combustion-supporting gas, nitrogen is powder feeding gas, after sandblasting roughening
Aluminum alloy base material surface carries out HVAF, and during spraying, propane pressure is 0.58MPa, and flow is 23L/min, oxygen
Pressure is 0.69MPa, and flow is 185L/min, and nitrogen pressure is 0.94MPa, and flow is 27L/min, and coating thickness is 780 μm,
Obtain cladding in the Si-Cr-Mn-SiC-Al wear-resistant coating of aluminum alloy surface.
The present invention passes through HVAF, in one layer of Si-Cr-Mn-SiC-Al wear-resistant coating of aluminum alloy surface cladding,
Its hardness is more than 305HV0.2.
Claims (1)
1. a kind of method of aluminium alloy HVAF Si-Cr-Mn-SiC-Al wear-resistant coating, it includes：
(1) by aluminum alloy base material sandblasting roughening treatment, roughness is more than Ra25；
(2) aluminum alloy base material after sandblasting roughening treatment is removed surface impurity；
(3) composite powder of 10-15wt%Si, 2-6wt%Cr, 0.5-3wt%Mn, 0.5-2wt%SiC and balance aluminum is mixed
Uniformly, it is deployed into slip after grinding；
(4) described slip is uniformly coated on aluminum alloy base material surface, is dried at 100-140 DEG C；
(5) propane gas are adopted to be fuel, high pressure oxygen is combustion-supporting gas, nitrogen is powder feeding gas, the aluminum after sandblasting roughening closes
Golden substrate surface carries out HVAF, and during spraying, propane pressure is 0.55-0.7MPa, and flow is 20-30L/min, oxygen
Atmospheric pressure is 0.65-0.7MPa, and flow is 180-200L/min, and nitrogen pressure is 0.85-1MPa, and flow is 18-30L/min,
Coating thickness is 700-800 μm, obtains cladding in the Si-Cr-Mn-SiC-Al wear-resistant coating of aluminum alloy surface.
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| CN201611015378.4A CN106399901A (en) | 2016-11-18 | 2016-11-18 | Method for spraying SiC-Si-Cr-Mn-Al abrasion-resistant coating on aluminum alloy through high velocity oxygen fuel spraying |
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| CN201611015378.4A CN106399901A (en) | 2016-11-18 | 2016-11-18 | Method for spraying SiC-Si-Cr-Mn-Al abrasion-resistant coating on aluminum alloy through high velocity oxygen fuel spraying |
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Citations (5)
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| EP0853684A1 (en) * | 1995-10-06 | 1998-07-22 | Ford Motor Company Limited | Method of depositing composite metal coatings |
| US5846349A (en) * | 1994-12-09 | 1998-12-08 | Ford Global Technologies, Inc. | Low alloy steel powder for plasma deposition having solid lubricant properties |
| CN101497978A (en) * | 2008-01-31 | 2009-08-05 | 北京赛亿表面工程技术有限公司 | Powder core wire material for high chrome molybdenum alloy arc spraying |
| CN101550549A (en) * | 2009-03-30 | 2009-10-07 | 湖北工业大学 | Al2O3/Al-Si composite coating by spray coating on aluminium alloy surface and preparation method |
| CN104357748A (en) * | 2014-10-31 | 2015-02-18 | 广东电网有限责任公司电力科学研究院 | Iron-based nanocrystalline composite coating for protecting boiler tail heating surface and laser-cladding forming process of iron-based nanocrystalline composite coating |
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2016
- 2016-11-18 CN CN201611015378.4A patent/CN106399901A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5846349A (en) * | 1994-12-09 | 1998-12-08 | Ford Global Technologies, Inc. | Low alloy steel powder for plasma deposition having solid lubricant properties |
| EP0853684A1 (en) * | 1995-10-06 | 1998-07-22 | Ford Motor Company Limited | Method of depositing composite metal coatings |
| CN101497978A (en) * | 2008-01-31 | 2009-08-05 | 北京赛亿表面工程技术有限公司 | Powder core wire material for high chrome molybdenum alloy arc spraying |
| CN101550549A (en) * | 2009-03-30 | 2009-10-07 | 湖北工业大学 | Al2O3/Al-Si composite coating by spray coating on aluminium alloy surface and preparation method |
| CN104357748A (en) * | 2014-10-31 | 2015-02-18 | 广东电网有限责任公司电力科学研究院 | Iron-based nanocrystalline composite coating for protecting boiler tail heating surface and laser-cladding forming process of iron-based nanocrystalline composite coating |
Non-Patent Citations (2)
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| 石淼森等: "《耐磨耐蚀涂膜材料与技术》", 31 January 2003, 化学工业出版社 * |
| 蔡明伟等: "喷涂工艺对超音速火焰喷涂Al-Cu-Fe-Si准晶合金涂层性能的影响", 《表面技术》 * |
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