CN101463458A - Method for high speed flame spraying heat-resistant alloy on steel cast workpiece surface - Google Patents
Method for high speed flame spraying heat-resistant alloy on steel cast workpiece surface Download PDFInfo
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- CN101463458A CN101463458A CNA2008102385569A CN200810238556A CN101463458A CN 101463458 A CN101463458 A CN 101463458A CN A2008102385569 A CNA2008102385569 A CN A2008102385569A CN 200810238556 A CN200810238556 A CN 200810238556A CN 101463458 A CN101463458 A CN 101463458A
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Abstract
The invention relates to a method of cast steel workpiece surface high speed flame plating fireproof alloy, comprising the steps: 1) pretreatment and roughening treatment are carried out on the surface of the cast steel workpiece; 2) a high speed oxygen-acetylene flame hot spray method is adopted to spray a priming coat on the surface of the cast steel workpiece; 3) working layers are sprayed on the surface of the cast steel workpiece by adopting the high speed oxygen-acetylene flame hot spray method, and 2-4 working layers are repeatedly sprayed by using the method and under the condition of the step 3). The parts prepared by the technique of cast steel workpiece surface high speed oxygen-acetylene flame plating fireproof alloy have higher inoxidability and thermal shock resistance, and can greatly prolong the service life of the cast steel workpiece. Meanwhile, the technology of the invention has the characteristics of simple and convenient operation, low cost and strong applicability, and is convenient for popularization and application.
Description
Technical field
The present invention relates to a kind of metallic surface spraying technology, especially a kind of method of improving the high speed flame spraying heat-resistant alloy on steel cast workpiece surface of cast steel surface thermal shock resistance.
Background technology
In recent years, along with the development and the application of spraying technology, the technology of preparation coating has obtained using widely on material matrix.Wherein the spraying of oxygen-acetylene torch have that cost is low, spray efficiency is high, easy and simple to handle and characteristics such as have wide range of applications and receive publicity.But, conventional flame plating is to melt powdered alloy to be sprayed with oxygen-acetylene torch, but there are not oxygen supply and fuel to carry out incendiary High Temperature High Pressure combustion chamber in the common spray gun, products of combustion so flame flow velocity degree is slow, heat is not concentrated, the aerial time of powder is long, makes the coating rough porous directly by the mixing section ejection, and oxide compound and no cofusing particle are many, Bond Strength of Coating is low, easily cracks and peels off, and the thickness of coating also is restricted.So adopt conventional oxygen-acetylene torch spraying to be difficult to form in conjunction with firm refractory coating on the cast steel surface.
HVOF (High Velocity Oxygen Fuel) is to utilize combustion gas to mix in specific High Temperature High Pressure combustion chamber with high pressure oxygen, burning and generation high speed flame stream (more than the flame flow velocity Du Keda 300m/s) in compression-expanding type nozzle, powdered alloy is sent into this flame stream, spraying particle can be heated to fusing or semi-molten state, and accelerating jetting is gone out.The time that the high-velocity spray particle stops in air is very short, and the chance that oxidation takes place is minimum, so HVOF (High Velocity Oxygen Fuel) can reduce even eliminate the oxide compound in the coating, increases substantially the density and the interface bond strength of coating.
At cast steel surface spraying one deck refractory alloy, can improve the thermal shock resistance of steel casting surface greatly.But, the difficulty of this technology is that the linear expansivity of cast steel and refractory alloy coating differs greatly, be difficult to form stable metallurgical binding between the two, and in thermal spray process, can produce bigger stress at bonding interface, cause component in use easily to produce coating stripping, influence quality product and work-ing life.For this reason, people have carried out great deal of experimental for many years, and the measure of employing mainly contains built-up welding, multiple permeation and thermospray.Wherein adopt plasma arc to carry out built-up welding on the cast steel surface, must adopt oxy-acetylene flame that workpiece is preheating to 450-500 ℃ before the weldering, complex process, productivity are low, and cost is higher.
Along with the development of hot-spraying techniques, spray to improve on the iron and steel parts surface and to be subjected to people's attention its work-ing life.Nippon Steel company is a prime coat with the nickel-based self-fluxing alloy that contains Co, Cr etc., adopts Al
2O
3+ Zr
2O
3For working lining sprays material surface, obtain and improve the component effect in work-ing life.With Al
2O
3+ Zr
2O
3Powder metallurgy is compared, and Ni-Cr powdered alloy cost is low, oxidation-resistance property is strong, if can successfully spray the alloy layer that contains the Ni-Cr alloy at the cast steel component surface, can prolong the work-ing life of cast steel component in hot environment greatly.By retrieval, about yet there are no report by the high speed oxygen-acetylene torch spraying refractory alloy especially method of Ni-Cr alloy on the cast steel surface.
Summary of the invention
The objective of the invention is for overcoming above-mentioned the deficiencies in the prior art, provide a kind of and can obtain the good alloy coat of thermal shock resistance, satisfy the method for cast steel component high speed flame spraying heat-resistant alloy on steel cast workpiece surface of service requirements under hot conditions at the cast steel component surface.
For achieving the above object, the present invention adopts following technical proposals: the method for a kind of cast steel workpiece surface high speed oxygen-acetylene torch spraying refractory alloy may further comprise the steps:
1) the cast steel workpiece surface is carried out pre-treatment and roughening treatment;
2) adopt high speed oxy-acetylene flame heat spraying method to cast steel workpiece surface spraying prime coat, processing parameter is: oxygen pressure 0.2MPa-0.8MPa, acetylene pressure 0.06MPa-0.12MPa, spray distance 120mm-180mm, powder sending quantity 10g/min-25g/min, 75 °-85 ° of spray angles, the prime coat thickness 20 μ m-60 μ m of acquisition;
3) adopt high speed oxy-acetylene flame heat spraying method to cast steel workpiece surface spraying working lining, processing parameter is: oxygen pressure 0.3MPa-0.9MPa, acetylene pressure 0.06MPa-0.14MPa, spray distance 120mm-200mm, powder sending quantity 20g/min-45g/min, 75 °-85 ° of spray angles, the working lining thickness 40 μ m-120 μ m of acquisition; Working lining repeats to spray 2-4 layers with the method and the condition of step 3).
Above-mentioned in the method for cast steel workpiece surface high speed oxygen-acetylene torch spraying heat-resistance abrasion-resistance alloy, the chemical ingredients of described cast steel workpiece is by weight percentage: C 0.12%-0.62%, Mn 0.35%-0.80%, Si 0.20%-0.45%, S and P are respectively 0.04%-0.06%, and all the other are Fe.
Pre-treatment in the described step 1) is meant carries out sandblasting or turning processing to cast steel workpiece surface to be sprayed, to remove the greasy dirt and the corrosion of cast steel workpiece surface.
Roughening treatment in the described step 1) is meant polishes with hand operated grinding wheel to the cast steel workpiece surface, makes it to expose the metallic surface of bright and clean alligatoring.
Described step 2) prime coat in adopts nickel alclad composite powder, and powder size is not less than 300 orders, and its composition is by weight percentage: Ni 75%～80%, Al 20%～25%.
Described step 2) optimal process parameter in: oxygen pressure 0.4MPa-0.6MPa, acetylene pressure 0.08MPa-0.10MPa, spray distance 140mm-160mm, powder sending quantity 10g/min-20g/min, 77 °-82 ° of spray angles.
Working lining in the described step 3) is the nickel base self-fluxing alloy powder that contains the Ni-Cr alloy, and powder size is not less than 300 orders, and its composition is by weight percentage: C 0.5%, and Si 3%, and B 2%, Fe＜3.3%, and Ni-Cr alloy 35%～50%, all the other are Ni.
Wherein, the nickel base self-fluxing alloy powder of the above-mentioned Ni-Cr of containing alloy preferably becomes component, is by weight percentage: C0.5%, and Si 3%, and B 2%, Fe＜3.3%, Ni-Cr alloy 40%～47%, all the other are Ni.
Optimal process parameter in the described step 3): oxygen pressure 0.5MPa-0.7MPa, acetylene pressure 0.09MPa-0.12MPa, spray distance 150mm-170mm, powder sending quantity 20g/min-45g/min, 77 °-82 ° of spray angles.
What the present invention proposed adopts nickel alclad composite powder at the cast steel component surface by the processing method that high speed oxygen-acetylene torch sprays refractory alloy, this powder is in thermal spray process, when the fusing point (660 ℃) that is arrived aluminium by flame heating is above, violent chemical reaction takes place between Ni, the Al, and emit a large amount of heats, help promoting forming metallurgical binding between prime coat and the cast steel substrate.
Adopt prime coat that obtains by the processing method of high speed oxygen-acetylene torch spraying refractory alloy on cast steel surface of the present invention and working lining dense structure, porosity low, chimeric mutually between the inner polygonal Ni-Cr alloying pellet of sprayed coating.This tissue morphology of sprayed coating inside has not only improved the bonding state between fine particle, and has improved the interface bond strength between matrix and sprayed coating and sprayed coating and the sprayed coating.
Compare with processing methodes such as metallic cementations with the built-up welding of surface plasma arc, adopt the component that prepare by the processing method of high speed oxygen-acetylene torch spraying refractory alloy on the cast steel surface of the present invention, have higher oxidation-resistance and heat-shock resistance, can improve the work-ing life of cast steel component greatly.Simultaneously, technology of the present invention also have easy and simple to handle, cost is low, characteristic of strong applicability, and is easy to utilize.
Embodiment
The present invention is further described below in conjunction with embodiment.
Embodiment 1:
Thickness is the conical steel casting of 40mm, and the upper bottom surface diameter is 200mm, and the bottom surface diameter is 350mm.The chemical ingredients of described cast steel is by weight percentage: C 0.20%, and Mn 0.55%%, and Si 0.36%, and S and P are respectively less than 0.04%, and all the other are Fe.Adopt the processing step of high speed oxygen-acetylene flame sprayed coating to be on the cast steel surface:
(1) sandblast cleaning steel casting surface is removed greasy dirt and corrosion.
(2), make it to expose the metallic surface of bright and clean alligatoring with hand operated grinding wheel polishing cast steel surface to be sprayed.
(3) adopting high speed oxy-acetylene flame spraying method, is that the nickel alclad powdered alloy of 40 μ m is as prime coat at the steel casting surface coating thickness.Processing parameter is: oxygen pressure 0.6MPaMPa, acetylene pressure 0.09MPaMPa, spray distance 160mm, powder sending quantity 20g/min, 80 ° of spray angles.
(4) adopt high speed oxy-acetylene flame spraying method, the nickel base self-fluxing alloy powder that contains the Ni-Cr alloy of coating thickness 60 μ m is as working lining on prime coat.Processing parameter is: oxygen pressure 0.7MPaMPa, acetylene pressure 0.10MPa, spray distance 170mm, powder sending quantity 30g/min, 82 ° of spray angles.
Working lining need repeat to spray 3 layers with step (4) method and condition.
The described prime coat of step (3) adopts nickel alclad composite powder, and powder size is not less than 300 orders, and its composition is by weight percentage: Ni80%, Al20%.
The described nickel base self-fluxing alloy powder that contains the Ni-Cr alloy of step (4), powder size is not less than 300 orders, and its composition is by weight percentage: C 0.5%, and Si 3%, and B 2%, Fe＜3.3%, Ni-Cr alloy 35%, all the other are Ni.
Because nickel alclad prime coat combines with cast steel substrate well, also form excellent metallurgical between nickel alclad prime coat and the working lining and combined, so realized firm metallurgical binding between working lining and the matrix, bonding strength reaches 50MPa.This processing method has improved the thermal shock resistance of cast steel workpiece surface, and wherein antioxidant property improves more than 5 times than cast steel substrate.
Embodiment 2:
Thickness is the Cast Steel Plate of 30mm, and length and width is of a size of 300mm * 100mm.The chemical ingredients of described cast steel is by weight percentage: C 0.35%, and Mn 0.60%, and Si 0.30%, and S and P are respectively less than 0.04%, and all the other are Fe.Adopt high speed oxygen-acetylene flame sprayed coating one deck refractory alloy layer on its surface, processing step is:
(1) greasy dirt and corrosion are removed in sandblast cleaning Cast Steel Plate surface.
(2), make it to expose the metallic surface of bright and clean alligatoring with hand operated grinding wheel polishing Cast Steel Plate surface.
(3) adopting high speed oxy-acetylene flame spraying method, is that the nickel alclad powdered alloy of 30 μ m is as prime coat at cast steel surface coating thickness.Processing parameter is: oxygen pressure 0.5MPa, acetylene pressure 0.07MPa, spray distance 150m, powder sending quantity 20g/min, 85 ° of spray angles.
(4) adopt high speed oxy-acetylene flame spraying method, the nickel base self-fluxing alloy powder that contains the Ni-Cr alloy of coating thickness 40 μ m is as working lining on prime coat.Processing parameter is: oxygen pressure 0.6MPa, acetylene pressure 0.08MPa, spray distance 160mm, powder sending quantity 40g/min, 85 ° of spray angles.
The described nickel base self-fluxing alloy powder that contains the Ni-Cr alloy, powder size is not less than 300 orders, and its composition is by weight percentage: C 0.5%, and Si 3%, and B 2.5%, Fe＜3.3%, Ni-Cr alloy 45%, all the other are Ni.
Because along with the increase of Ni-Cr alloy content in the nickel base self-fluxing alloy powder that contains the Ni-Cr alloy, the thermotolerance of the sprayed surface working lining that obtains improves greatly.
Described prime coat adopts nickel alclad composite powder, and powder size is not less than 300 orders, and its composition is by weight percentage: Ni80%, Al20%.
Embodiment 3:
Thickness is the cast steel tubing of 20mm, external diameter 150mm, length 250mm.The chemical ingredients of described cast steel is by weight percentage: C0.45%, and Mn0.60%, Si0.35%, S and P are respectively less than 0.05%, and all the other are Fe.Adopt high speed oxygen-acetylene flame sprayed coating one deck refractory alloy layer at this cast iron pipe surfaces externally and internally, processing step is:
(1) before the spraying cast steel workpiece surface is carried out pre-treatment and roughening treatment; Described pre-treatment is meant carries out sandblasting or turning processing to steel casting surface to be sprayed, to remove the greasy dirt and the corrosion on cast steel surface; Described roughening treatment is meant carries out the hand operated grinding wheel polishing to the cast steel surface, makes it to expose the metallic surface of bright and clean alligatoring.
(2) adopt high speed oxy-acetylene flame spraying method to cast steel workpiece surface spraying prime coat, processing parameter is: oxygen pressure 0.5MPa, acetylene pressure 0.09MPa, spray distance 150mm, powder sending quantity 15g/min, 80 ° of spray angles, the prime coat thickness 40 μ m of acquisition;
(3) adopt high speed oxy-acetylene flame spraying method to cast steel workpiece surface spraying working lining, processing parameter is: oxygen pressure 0.6MPa-0.7MPa, acetylene pressure 0.09MPa, spray distance 160mm, powder sending quantity 28/min, 78 ° of spray angles, the working lining thickness 70 μ m of acquisition;
Working lining repeats to spray 3 layers with step (3) method and condition.
The described prime coat of step (2) adopts nickel alclad composite powder, and powder size is not less than 300 orders, and its composition is by weight percentage: Ni 75%, Al 25%.
The described working lining of step (3) is the nickel base self-fluxing alloy powder that contains the Ni-Cr alloy, and powder size is not less than 300 orders, and its composition is by weight percentage: C 0.5%, and Si 3%, and B 2%, Fe＜3.3%, and Ni-Cr alloy 40%～47%, all the other are Ni.
Enforcement of the present invention, can obtain in conjunction with the firm refractory alloy sprayed coating that contains the Ni-Cr alloy at the cast steel component surface, can be used for the heat-resisting reinforcement and the reparation of cast steel component surface, as the surface spraying of steel castings such as heat-resisting valve sealing face, steam turbine cylinder cap, boiler tube base.Also can be used for the preparation or the reparation of the ferrous materials component surface thermal shock-resistant coating of other types.
Claims (8)
1. the method for a high speed flame spraying heat-resistant alloy on steel cast workpiece surface is characterized in that, may further comprise the steps:
1) the cast steel workpiece surface is carried out pre-treatment and roughening treatment;
2) adopt high speed oxy-acetylene flame heat spraying method to cast steel workpiece surface spraying prime coat, processing parameter is: oxygen pressure 0.2MPa-0.8MPa, acetylene pressure 0.06MPa-0.12MPa, spray distance 120mm-180mm, powder sending quantity 10g/min-25g/min, 75 °-85 ° of spray angles, the prime coat thickness 20 μ m-60 μ m of acquisition;
3) adopt high speed oxy-acetylene flame heat spraying method to cast steel workpiece surface spraying working lining, processing parameter is: oxygen pressure 0.3MPa-0.9MPa, acetylene pressure 0.06MPa-0.14MPa, spray distance 120mm-200mm, powder sending quantity 20g/min-45g/min, 75 °-85 ° of spray angles, the working lining thickness 40 μ m-120 μ m of acquisition; Working lining repeats to spray 2-4 layers with the method and the condition of step 3).
2. the method for high speed flame spraying heat-resistant alloy on steel cast workpiece surface according to claim 1, it is characterized in that: the chemical ingredients of described cast steel workpiece is by weight percentage: C 0.12%-0.62%, Mn 0.35%-0.80%, Si 0.20%-0.45%, S and P are respectively 0.04%-0.06%, and all the other are Fe.
3. the method for high speed flame spraying heat-resistant alloy on steel cast workpiece surface according to claim 1, it is characterized in that: the pre-treatment in the described step 1) is meant carries out sandblasting or turning processing to cast steel workpiece surface to be sprayed, to remove the greasy dirt and the corrosion of cast steel workpiece surface.
4. the method for high speed flame spraying heat-resistant alloy on steel cast workpiece surface according to claim 1, it is characterized in that: the roughening treatment in the described step 1) is meant polishes with hand operated grinding wheel to the cast steel workpiece surface, makes it to expose the metallic surface of bright and clean alligatoring.
5. the method for high speed flame spraying heat-resistant alloy on steel cast workpiece surface according to claim 1, it is characterized in that: the prime coat described step 2) adopts nickel alclad composite powder, powder size is not less than 300 orders, and its composition is by weight percentage: Ni 75%～80%, Al 20%～25%.
6. the method for high speed flame spraying heat-resistant alloy on steel cast workpiece surface according to claim 1, it is characterized in that: the optimal process parameter described step 2): oxygen pressure 0.4MPa-0.6MPa, acetylene pressure 0.08MPa-0.10MPa, spray distance 140mm-160mm, powder sending quantity 13g/min-17g/min, 77 °-82 ° of spray angles.
7. the method for high speed flame spraying heat-resistant alloy on steel cast workpiece surface according to claim 1, it is characterized in that: the working lining in the described step 3) is the nickel base self-fluxing alloy powder that contains the Ni-Cr alloy, powder size is not less than 300 orders, its composition is by weight percentage: C 0.5%, Si 3%, and B 2%, Fe＜3.3%, Ni-Cr alloy 35%～50%, all the other are Ni;
Wherein, the nickel base self-fluxing alloy powder of the above-mentioned Ni-Cr of containing alloy preferably becomes component, is by weight percentage: C0.5%, and Si 3%, and B 2%, Fe＜3.3%, Ni-Cr alloy 40%～47%, all the other are Ni.
8. the method for high speed flame spraying heat-resistant alloy on steel cast workpiece surface according to claim 1, it is characterized in that: the optimal process parameter in the described step 3): oxygen pressure 0.5MPa-0.7MPa, acetylene pressure 0.09MPa-0.12MPa, spray distance 150mm-170mm, powder sending quantity 27g/min-33g/min, 77 °-82 ° of spray angles.
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| CN102847912A (en) * | 2011-07-01 | 2013-01-02 | 厦门市兴鹭港压铸机配件有限公司 | Sprue nozzle head jointed sprue pipe and method for processing same |
| CN103160768A (en) * | 2011-12-17 | 2013-06-19 | 鞍钢重型机械有限责任公司 | Crystallizer copper plate wear-resisting coating and supersonic speed spraying method thereof |
| CN103710693A (en) * | 2013-12-12 | 2014-04-09 | 江苏克罗德科技有限公司 | Insulation aluminized zinc plate and preparation method thereof |
| CN103882324A (en) * | 2014-03-25 | 2014-06-25 | 王金芳 | Anti-corrosion wear-resisting coating and coating method thereof |
| CN105839020A (en) * | 2016-04-18 | 2016-08-10 | 和县隆盛精密机械有限公司 | High-temperature-resistant coating on surface of welded mechanical arm |
| CN106011723A (en) * | 2016-06-23 | 2016-10-12 | 安徽恒意硬面工程股份有限公司 | Early strengthening treatment technology for surface of hot-rolling forming roller |
| CN110144538A (en) * | 2019-05-27 | 2019-08-20 | 武汉材料保护研究所有限公司 | A kind of hydraulic support column surface recombination thermal spraying restorative procedure |
| CN111530720A (en) * | 2020-04-26 | 2020-08-14 | 马鞍山钢铁股份有限公司 | Technology for processing return fan impeller of chain grate machine |
| CN111963786A (en) * | 2018-09-10 | 2020-11-20 | 张旺 | Vacuum heat insulation pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102847912A (en) * | 2011-07-01 | 2013-01-02 | 厦门市兴鹭港压铸机配件有限公司 | Sprue nozzle head jointed sprue pipe and method for processing same |
| CN102847912B (en) * | 2011-07-01 | 2015-05-20 | 厦门市兴鹭港压铸机配件有限公司 | Sprue nozzle head jointed sprue pipe and method for processing same |
| CN103160768A (en) * | 2011-12-17 | 2013-06-19 | 鞍钢重型机械有限责任公司 | Crystallizer copper plate wear-resisting coating and supersonic speed spraying method thereof |
| CN103710693A (en) * | 2013-12-12 | 2014-04-09 | 江苏克罗德科技有限公司 | Insulation aluminized zinc plate and preparation method thereof |
| CN103882324A (en) * | 2014-03-25 | 2014-06-25 | 王金芳 | Anti-corrosion wear-resisting coating and coating method thereof |
| CN103882324B (en) * | 2014-03-25 | 2016-01-27 | 王金芳 | A kind of antiseptic wearable coat and coating method thereof |
| CN105839020A (en) * | 2016-04-18 | 2016-08-10 | 和县隆盛精密机械有限公司 | High-temperature-resistant coating on surface of welded mechanical arm |
| CN105839020B (en) * | 2016-04-18 | 2017-10-20 | 和县隆盛精密机械有限公司 | A kind of electroplating equipment wielding machine arm surface refractory coating |
| CN106011723A (en) * | 2016-06-23 | 2016-10-12 | 安徽恒意硬面工程股份有限公司 | Early strengthening treatment technology for surface of hot-rolling forming roller |
| CN111963786A (en) * | 2018-09-10 | 2020-11-20 | 张旺 | Vacuum heat insulation pipe |
| CN110144538A (en) * | 2019-05-27 | 2019-08-20 | 武汉材料保护研究所有限公司 | A kind of hydraulic support column surface recombination thermal spraying restorative procedure |
| CN111530720A (en) * | 2020-04-26 | 2020-08-14 | 马鞍山钢铁股份有限公司 | Technology for processing return fan impeller of chain grate machine |
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