CN104711506A - Spraying method of high-thickness high-performance coating - Google Patents
Spraying method of high-thickness high-performance coating Download PDFInfo
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- CN104711506A CN104711506A CN201510127844.7A CN201510127844A CN104711506A CN 104711506 A CN104711506 A CN 104711506A CN 201510127844 A CN201510127844 A CN 201510127844A CN 104711506 A CN104711506 A CN 104711506A
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- coating
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- fluxing alloy
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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
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
Abstract
The invention discloses a spraying method of a high-thickness high-performance coating, which comprises the following steps: cleaning a metal matrix surface, and carrying out sandblasting pretreatment; by using compressed air as main gas and powder delivery gas, depositing a 0.5-5mm-thick self-fluxing alloy coating on the metal matrix surface by atmosphere plasma spraying; and by using compressed air as main gas, carrying out remelting treatment on the spray-state coating by plasma flame flow. The method can effectively enhance the thickness and compactness of the coating, enhances the bonding strength between the coating and matrix, greatly lowers the manufacturing cost of the coating, and enhances the production efficiency.
Description
Technical field
The present invention, in hot spray coating technical field, relates to the spraying method of a kind of heavy thickness, high-performance coating.
Background technology
The inefficacy such as wearing and tearing, corrosion of metallic substance, generally from its surface, the financial loss caused by these inefficacies is quite surprising.Although engineering high performance structures steel has good mechanics and chemical property, under the Working environment that petrochemical complex, mine, drilling unit etc. are complicated, the performance depending merely on himself can't meet service requirements completely.Carrying out surface treatment to some key structure parts is a kind of effective means, wherein adopts atmospheric plasma spraying technology to prepare corrosion-resistant, the anti abrasive coating of one deck at structural member surface, can effectively improve material property and service life, and convenient and economical.
Air plasma spraying is a kind of important method of hot-spraying techniques, it grows up along with the appearance of modern Aviation, spationautics, the every field such as Aeronautics and Astronautics, military affairs, machinery, electric power and biotechnology are widely used at present, from the eighties in last century, atmospheric plasma spraying technology starts to become thermospray surface-treated prevailing technology, and its application percentage reaches nearly 50%.Air plasma spraying with high temperature (> 10000 DEG C), plasma flame flow at a high speed for thermal source, Powdered spray material is heated to melted state, and accelerate to form high speed molten drop, molten drop clashes into matrix or deposited coatings is surperficial, there is flattening, fast cooled and solidified, by the cumulative formation coating of countless flaky particles.
Air plasma spraying coating has typical stratiform, vesicular structure, the general > 2% of porosity of spraying state coating.Between the three-dimensional hole in coating, particle, the existence of the defect such as non-bonding interface and vertical micro--crack has had a strong impact on the use properties of coating under the conditions such as burn into wearing and tearing.
The bonding strength of coating and matrix evaluates the important indicator of coating quality.Because matrix to differ comparatively large with the chemical composition of coated material, its weave construction and physical and chemical performance differ greatly, and in the interface of matrix with coating in spraying process, can produce larger unrelieved stress due to temperature and phase transformation, thus the bonding strength at reduction interface.Based on mechanical bond, there is obvious interface between the two in the combination of usual coating and matrix, affects the combination of coating and base material, especially easily chaps under the severe condition such as high temperature, pressurized, peeling, the phenomenon such as to peel off, thus cause coating failure.At present, by means of domestic plasma spraying technology, the best combination intensity of usual metallic coating and matrix can only reach about 70 MPa.
Generally, along with the increase of coat-thickness, its porosity can improve, and the microhardness of coating can reduce.Testing data shows, when coat-thickness is increased to after 500 μm from 100 μm, porosity improves 2.6 times, and microhardness then reduces 30%.In addition, based on air plasma spraying principle, usual coat-thickness and bonding strength are inversely proportional to, and namely thickness is thicker, and bonding strength is poorer.Because along with the increase of coat-thickness, the unrelieved stress of coat inside also increases thereupon.Research shows, after coat-thickness is increased to 500 μm from 100 μm, the bonding strength of coating and matrix reduces about 70%.Therefore, air plasma spraying coating is general thinner, can not meet the application requiring of heavy thickness specific coatings, is also difficult to process on-plane surface, the component of shaped face and component because not having enough surpluses.
At present, in order to realize the coating of excellent performance, in air plasma spraying process, usually adopt price He, H costly
2deng gas, and gas usage is comparatively large, thus adds the manufacturing cost of spraying coating process and final coating.
The coating deposited by the self-fluxing alloy powder such as Ni base, Co base, Fe base has heat-resisting, anti-oxidant, resistance to high temperature corrosion, the plurality of advantages such as wear-resistant, is therefore widely used in the industries such as oil, chemical industry, cement.At present, generally prepare coating by hot-spraying techniques deposition self-fluxing alloy powder, then by laser, re melting process is carried out to spraying state coating.As flame plating self-fluxing alloy coating in conjunction with laser remolten process, air plasma spraying self-fluxing alloy coating in conjunction with laser remolten process etc.Although access compact structure, coating that bonding strength is higher by the recombination energy of different process, but deposition and remelting due to coating adopt two kinds of different techniques, thus increase the complicacy of coating manufacturing process, add production cost, reduce production efficiency.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides efficient, the low cost preparation method of a kind of heavy thickness, high-performance coating.
Technical scheme: for solving the problems of the technologies described above, the spraying method of a kind of heavy thickness provided by the invention, high-performance coating, its preparation process is: adopt atmospheric plasma spraying technology at metal base surface deposition heavy thickness self-fluxing alloy coating, then adopt plasma flame flow to carry out re melting process to spraying state coating, finally prepare required coating.
Its concrete preparation process is:
(1) adopt acetone to clean metal base surface, removed the oxide skin of matrix surface by sandblasting, obtain uneven surface;
(2) employing atmospheric plasma spraying technology is the self-fluxing alloy coating of 0.5-5 mm at metal base surface deposit thickness, and main gas and powder feeding gas all select pressurized air;
(3) adopt plasma flame flow to carry out re melting process to spraying state coating, main gas selects pressurized air.
First the present invention cleans metal base surface, sandblast pretreatment; Again with pressurized air for main gas and powder feeding gas, by air plasma spraying at metal base surface deposition 0.5-5 mm thick self-fluxing alloy coating; Then using pressurized air as main gas, by plasma flame flow, re melting process is carried out to spraying state coating.
Beneficial effect: the present invention has the following advantages in terms of existing technologies:
Utilize present method effectively can improve the bonding strength of coat-thickness and compactness, raising coating and matrix, greatly reduce the manufacturing cost of coating simultaneously, enhance productivity.
Accompanying drawing explanation
Fig. 1 to adopt in the present invention coating morphology after the remelting of air plasma spraying Ni base self-fluxing alloy coating plasma flame flow.
Fig. 2 adopts coating morphology after air plasma spraying Ni base self-fluxing alloy in the present invention/WC compound coating plasma flame flow remelting.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
The spraying method of heavy thickness of the present invention, high-performance coating comprises the steps:
Metal base surface pre-treatment before step one, spraying, adopts acetone cleaning matrix surface, by sandblasting alligatoring matrix surface;
Step 2, using pressurized air as main gas and powder feeding gas, air plasma spraying equipment is adopted to deposit the thick self-fluxing alloy coating of 0.5-5 mm at metal base surface by atmospheric plasma spraying technology, self-fluxing alloy coating can adopt Co base, Ni base, Fe base self-fluxing alloy material, or self-fluxing alloy/ceramic composite;
Step 3, using pressurized air as main gas, by plasma flame flow, re melting process is carried out to spraying state coating.
Application present method, can adopt Ukraine Kiev-7 type air plasma spraying equipment, through the thick Ni base self-fluxing alloy coating of pretreated 2Cr13 stainless steel base (50 × 40 × 5 mm) surface spraying 2 mm; Spray material used is Ni base self-fluxing alloy powder PG-10N-01; Main spray parameters is: plasma arc power 28 kW, main gas (pressurized air) pressure 0.15 MPa, flow 6 m
3/ h, powder feeding gas (pressurized air) pressure 6 kPa, spray distance 200 mm; The remelting parameter of coating is: remelting distance 100 mm.By the coating that this parameter is prepared, as shown in Figure 1, porosity < 2%, bonding strength > 200 MPa, microhardness > 1000 HV.
Also Ukraine Kiev-7 type air plasma spraying equipment can be adopted, through the thick Co base self-fluxing alloy coating of pretreated 2Cr13 stainless steel base (50 × 40 × 5 mm) surface spraying 2 mm; Spray material used is Co base self-fluxing alloy powder PG-10K-01; Main spray parameters is: plasma arc power 31.5 kW, main gas (pressurized air) pressure 0.15 MPa, flow 6 m
3/ h, powder feeding gas (pressurized air) pressure 6 kPa, spray distance 200 mm; The remelting parameter of coating is: remelting distance 100 mm.
Also can adopt Ukraine Kiev-7 type air plasma spraying equipment, through the thick Ni base self-fluxing alloy/WC compound coating of pretreated 2Cr13 stainless steel base (50 × 40 × 5 mm) surface spraying 2 mm; Spray material used is the mechanically mixing powder PS-12NVK-01 of Ni base self-fluxing alloy powder and WC powder; Main spray parameters is: plasma arc power 46.2 kW, main gas (pressurized air) pressure 0.23 MPa, flow 6.9 m
3/ h, powder feeding gas (pressurized air) pressure 6 kPa, spray distance 200 mm; The remelting parameter of coating is: remelting distance 100 mm.By the coating that this parameter is prepared, as shown in Figure 2, porosity < 1%, bonding strength > 200 MPa, microhardness > 1100 HV.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (3)
1. the spraying method of a heavy thickness, high-performance coating, it is characterized in that: its preparation process is: adopt atmospheric plasma spraying technology at metal base surface deposition heavy thickness self-fluxing alloy coating, then adopt plasma flame flow to carry out re melting process to spraying state coating, finally prepare required coating.
2. the spraying method of heavy thickness according to claim 1, high-performance coating, is characterized in that: its concrete preparation process is:
(1) adopt acetone to clean metal base surface, removed the oxide skin of matrix surface by sandblasting, obtain uneven surface;
(2) by air plasma spraying equipment at metal base surface deposit thickness be the self-fluxing alloy coating of 0.5-5 mm, main gas and powder feeding gas all use pressurized air, described self-fluxing alloy coating adopts Co base, Ni base or Fe base self-fluxing alloy material, or self-fluxing alloy/ceramic composite;
(3) adopt plasma flame flow to carry out re melting process to spraying state coating, main gas selects pressurized air.
3. the spraying method of heavy thickness according to claim 2, high-performance coating, is characterized in that: the significant parameter in step (2) and (3): plasma arc power 28 ~ 46.2 kW, main atmospheric pressure 0.15 ~ 0.23 MPa, flow 6 ~ 6.9 m
3/ h, powder feeding gas pressure 6 kPa, spray distance 200 mm; The remelting parameter of coating is: remelting distance 100 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510127844.7A CN104711506A (en) | 2015-03-23 | 2015-03-23 | Spraying method of high-thickness high-performance coating |
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| CN201510127844.7A CN104711506A (en) | 2015-03-23 | 2015-03-23 | Spraying method of high-thickness high-performance coating |
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| CN104711506A true CN104711506A (en) | 2015-06-17 |
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| CN201510127844.7A Pending CN104711506A (en) | 2015-03-23 | 2015-03-23 | Spraying method of high-thickness high-performance coating |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105369187A (en) * | 2015-11-20 | 2016-03-02 | 江苏尚大海洋工程技术有限公司 | Method for preparing acid and alkali resistant nanometer hastelloy coating through plasma spraying and overall remelting |
| CN106835112A (en) * | 2016-12-16 | 2017-06-13 | 中国兵器科学研究院宁波分院 | A kind of preparation method of the stainless steel composite coating of Mg alloy surface cold spraying 420 |
| CN108866470A (en) * | 2018-06-19 | 2018-11-23 | 扬州睿德石油机械有限公司 | A kind of preparation method of air plasma spraying alloy-ceramic laminar coating |
| CN110337337A (en) * | 2017-02-14 | 2019-10-15 | 荏原环境工程株式会社 | Ni base sprays alloy powder and alloy by film manufacturing method |
| CN114540743A (en) * | 2022-01-14 | 2022-05-27 | 江苏通和生物医药科技有限公司 | Zirconium alloy surface plasma spraying remelting Cr/FeCrAl coating and preparation method thereof |
| CN115305433A (en) * | 2022-07-25 | 2022-11-08 | 广东羚光新材料股份有限公司 | Nickel net and preparation method and application thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1203960A (en) * | 1998-05-29 | 1999-01-06 | 宝山钢铁(集团)公司 | Nickel base self-fluxing alloy powder |
| CN102286718A (en) * | 2010-06-17 | 2011-12-21 | 上海宝钢设备检修有限公司 | Method for improving bond strength of thermal spraying coating layer and metal substrate |
-
2015
- 2015-03-23 CN CN201510127844.7A patent/CN104711506A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1203960A (en) * | 1998-05-29 | 1999-01-06 | 宝山钢铁(集团)公司 | Nickel base self-fluxing alloy powder |
| CN102286718A (en) * | 2010-06-17 | 2011-12-21 | 上海宝钢设备检修有限公司 | Method for improving bond strength of thermal spraying coating layer and metal substrate |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105369187A (en) * | 2015-11-20 | 2016-03-02 | 江苏尚大海洋工程技术有限公司 | Method for preparing acid and alkali resistant nanometer hastelloy coating through plasma spraying and overall remelting |
| CN106835112A (en) * | 2016-12-16 | 2017-06-13 | 中国兵器科学研究院宁波分院 | A kind of preparation method of the stainless steel composite coating of Mg alloy surface cold spraying 420 |
| CN110337337A (en) * | 2017-02-14 | 2019-10-15 | 荏原环境工程株式会社 | Ni base sprays alloy powder and alloy by film manufacturing method |
| CN110337337B (en) * | 2017-02-14 | 2022-03-29 | 荏原环境工程株式会社 | Ni-based spray alloy powder and method for producing alloy coating film |
| US11597992B2 (en) | 2017-02-14 | 2023-03-07 | Ebara Environmental Plant Co., Ltd | Ni-based thermal spraying alloy powder and method for manufacturing alloy coating |
| CN108866470A (en) * | 2018-06-19 | 2018-11-23 | 扬州睿德石油机械有限公司 | A kind of preparation method of air plasma spraying alloy-ceramic laminar coating |
| CN114540743A (en) * | 2022-01-14 | 2022-05-27 | 江苏通和生物医药科技有限公司 | Zirconium alloy surface plasma spraying remelting Cr/FeCrAl coating and preparation method thereof |
| CN115305433A (en) * | 2022-07-25 | 2022-11-08 | 广东羚光新材料股份有限公司 | Nickel net and preparation method and application thereof |
| CN115305433B (en) * | 2022-07-25 | 2024-01-09 | 广东羚光新材料股份有限公司 | Nickel screen and preparation method and application thereof |
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