CN102925847A - Method for preparing submicron abrasion and corrosion resisting coating of flow passage component of water turbine - Google Patents
Method for preparing submicron abrasion and corrosion resisting coating of flow passage component of water turbine Download PDFInfo
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- CN102925847A CN102925847A CN2012104375286A CN201210437528A CN102925847A CN 102925847 A CN102925847 A CN 102925847A CN 2012104375286 A CN2012104375286 A CN 2012104375286A CN 201210437528 A CN201210437528 A CN 201210437528A CN 102925847 A CN102925847 A CN 102925847A
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Abstract
The invention discloses a method for preparing a submicron abrasion and corrosion resisting coating of a flow passage component of a water turbine. The method includes: step 1, washing the surface of the flow passage component of the water turbine to remove scale and scale cinder; step 2, performing rough process on the surface of the flow passage component; step 3, preheating the surface of the flow passage component, improving the temperature of WC-Co particles when contacting with workpieces, wherein the preheating range needs to exceed for 50-100mm of the periphery of the surface to be sprayed, and the temperature of a base material needs to be controlled to not exceed 120 DEG C; step 4, performing polishing treatment after the preheating to remove a high-temperature oxidation film on the surface; and step 5, spraying submicron WC-Co powder through flame of a kerosene-oxygen spray gun. The submicron abrasion and corrosion resisting coating obtained through spraying of hypersonic flame spraying has high hardness, good abrasion resistance and cavitation resisting capability, can effectively protect materials of the flow passage component of the water turbine, prolongs service life of the flow component part, increases power generation efficiency, reduces maintenance cost and has large economic benefit.
Description
Technical field
The invention belongs to field of metal surface treatment technology, relate to a kind of preparation method of water turbine overflowing component submicron erosion resistant coating.
Background technology
Water power is a kind of pollution-free, sustainable energy of effectively alleviating energy crisis.Water turbine overflowing component is the vitals that water can be converted into the mechanical energy of rotor, and its quality and life-span are directly determining the safety of generating efficiency and unit operation.China's silt content of river is large, and wherein Huanghe valley sediment concentration the first in the world more, and husky feelings is complicated, contains husky characteristics in different zones also different.But the grains of sand of different-grain diameter directly strike the surface of water turbine overflowing component under the carrying of high velocity flow, and high-frequency continuous impact is that the metallic surface fatigue occurs and loses original performance, produces defective; The generation of defective so that the metallic surface planeness be affected, for the generation of cavitating provides condition, under the comprehensive action of washing away and cavitating of silt, the water turbine overflowing component surface property is reduced like this, stability decreases is when serious even local fracture occurs and peel off.Present stage severe water and soil erosion; the sediment concentration in river day by day increases; the water turbine in a lot of power stations is just had to such an extent that shutdown carries out large repairs after through a flood season; adopt so rational process for treating surface; improve the wear-corrosion resistance of water turbine overflowing component; can effectively improve the cycle of water turbine overflowing component, have huge economic benefit.
Summary of the invention
Purpose of the present invention is with regard to being for the abrasion situation of water turbine overflowing component in the water power and a kind of preparation method of water turbine overflowing component submicron erosion resistant coating is provided, adopt supersonic flame spraying method in water turbine overflowing component surface preparation submicron erosion resistant coating, water turbine overflowing component is repaired and strengthened, to increase intensity and the wear-corrosion resistance of metallic surface.
The present invention is by the following technical solutions:
A kind of preparation method of water turbine overflowing component submicron erosion resistant coating, adopt following steps:
Step 1 is cleaned the water turbine overflowing component surface that will spray, and removes dirt and oxide skin;
Step 2 is carried out roughening treatment to the flow passage components surface; Make the flow passage components surface coarsening as far as possible;
Step 3 is carried out preheating to the flow passage components surface, the temperature when raising WC-Co particle contacts with workpiece, and pre-heat rating should exceed marginal surface 50 ~ 100 mm to be painted, and the control base material temperature is no more than 120 ℃;
Step 4 is carried out grinding process after the preheating, remove the surface high-temp oxide film;
Step 5 adopts kerosene-oxygen lance flame plating submicron WC-Co powder, and kerosene oil flow is 20 ~ 50 L/h, and oxygen flow is 50 ~ 90 m
3/ h, spray distance 300 ~ 400 mm, powder feed rate are 50 ~ 130 g/min.Coatingsurface brilliance, smooth finish can reach ▽ 6, and coating microhardness can reach HV1100, and coating thickness is 100 ~ 250 μ m.
As preferably, the grain fineness number of described submicron WC-Co powder is 0.5 ~ 1 μ m.
As preferably, described coat-thickness is 100 ~ 250 μ m.Each spraying maximum ga(u)ge is no more than 100 μ m, after whole zone has been sprayed, sprays to improve again the thickness of coating next time.
As preferably, in the described step 5, oxygen flow is set in 56 m
3/ h, kerosene oil flow is 30 L/h, and nitrogen flow is 0.25 MPa, and spray distance is 350 mm, and the speed of powder feeding is 70 g/min, coat-thickness is 200 μ m.Coatingsurface brilliance, smooth finish can reach ▽ 6, and coating microhardness can reach HV1100.
As preferably, in the described step 5, use model to be the supersonic velocity flame plating equipment of JP-5000, oxygen flow is set in 65 m
3/ h, kerosene oil flow is 40 L/h, and spray distance is 400 mm, and powder feed rate is 80 g/min, and coat-thickness is 250 μ m.Coatingsurface brilliance, smooth finish can reach ▽ 6, and coating microhardness can reach HV1100.
Beneficial effect of the present invention is:
Adopt submicron WC-Co powder to spray, this powder belongs to the ceramic hard powdered alloy, has higher hardness and good toughness, at water conservancy flow passage components surface spraying submicron WC-Co powder, can improve intensity, hardness and the wear-corrosion resistance of metallic surface, coating and substrate combinating strength are higher, improve the work-ing life of water turbine water conservancy flow passage components, can well solve the abrasion situation of current turbine blade.
The coating wear-corrosion resistance is good, the applicable object scope wide, the working (machining) efficiency advantages of higher because it has for hypersonic flame spraying, employing supersonic spray coating technology is repaired the water turbine overflowing component surface and is strengthened, has great superiority than traditional technique for overlaying, can reduce maintenance cost, shorten maintenance cycle, improve maintenance efficiency etc., have important using value and huge economic and social benefits.
The submicron erosion resistant coating that the present invention adopts hypersonic flame spraying to obtain has very high hardness, good wear resisting property and anti-cavitation erosion ability; can effectively protect the material of water turbine overflowing component; improved the work-ing life of flow passage components; increase generating efficiency, reduced maintenance cost.
Embodiment:
Below the present invention is described in further detail with embodiment:
Embodiment 1:
Step 1 is at first cleaned the water turbine overflowing component surface that will spray, and removes dirt and oxide skin;
Step 2 is carried out roughening treatment, makes the flow passage components surface coarsening as far as possible;
Step 3 is carried out preheating to workpiece surface, the temperature when raising WC-Co particle contacts with workpiece, and pre-heat rating should exceed marginal surface 80 mm to be painted, and the control base material temperature is no more than 120 ℃;
Step 4 is carried out grinding process after the preheating, remove the surface high-temp oxide film;
Step 5 uses model to be the supersonic velocity flame plating equipment of JP-5000, selects the WC-12Co submicron powder, and oxygen flow is set in 56 m
3/ h, kerosene oil flow is 25 L/h,
Nitrogen flow is 0.25 MPa, spray distance is 300 mm, the speed of powder feeding is 60 g/min.Spray on water turbine overflowing component surface after treatment, each spraying maximum ga(u)ge is no more than 100 μ m, after whole zone sprayed, spray to improve again the thickness of coating next time, obtain at last the coating that thickness is about 200 μ m, and coatingsurface brilliance, smooth finish can reach ▽ 6, and coating microhardness can reach HV1100.This coating had both been protected metal rigidity, hardness and the thermal conductivity of impeller; again so that the wear-corrosion resistance of metallic surface be improved; can prolong the working hour of water turbine overflowing component; and through after the operation in flood season; as the zone that is found wearing and tearing can also apply repairing again, and on the not impact of body material of water turbine overflowing component, the work-ing life of prolongation water turbine overflowing component that can several times; reduce maintenance number of times and production cost, had larger economic benefit.
Embodiment 2:
Step 1 is at first cleaned the water turbine overflowing component surface that will spray, and removes dirt and oxide skin;
Step 2 is carried out roughening treatment, makes the flow passage components surface coarsening as far as possible;
Step 3 is carried out preheating to workpiece surface, the temperature when raising WC-Co particle contacts with workpiece, and pre-heat rating should exceed marginal surface 50 mm to be painted, and the control base material temperature is no more than 120 ℃;
Step 4 is carried out grinding process after the preheating, remove the surface high-temp oxide film;
Step 5 uses model to be the supersonic velocity flame plating equipment of JP-5000, selects the WC-12Co submicron powder, and oxygen flow is set in 65 m
3/ h, kerosene oil flow is 30 L/h,, spray distance is 340 mm, powder feed rate is 80 g/min.Spray on water turbine overflowing component surface after treatment, obtain the coating that thickness is about 100 μ m, and coatingsurface brilliance, smooth finish can reach ▽ 6, and coating microhardness can reach HV1100.
Embodiment 3:
Step 1 is at first cleaned the water turbine overflowing component surface that will spray, and removes dirt and oxide skin;
Step 2 is carried out roughening treatment, makes the flow passage components surface coarsening as far as possible;
Step 3 is carried out preheating to workpiece surface, the temperature when raising WC-Co particle contacts with workpiece, and pre-heat rating should exceed marginal surface 100 mm to be painted, and the control base material temperature is no more than 120 ℃;
Step 4 is carried out grinding process after the preheating, remove the surface high-temp oxide film;
Step 5 uses model to be the supersonic velocity flame plating equipment of JP-5000, selects the WC-12Co submicron powder, and oxygen flow is set in 70m
3/ h, kerosene oil flow is 35L/h, and spray distance is 380 mm, and powder feed rate is 100g/min.Spray on water turbine overflowing component surface after treatment, spray maximum ga(u)ge at every turn and be no more than 100 μ m, after whole zone has been sprayed, spray to improve again the thickness of coating next time, obtain at last the coating that thickness is about 400 μ m.And coatingsurface brilliance, smooth finish can reach ▽ 6, and coating microhardness can reach HV1100.
Embodiment 4:
Step 1 is at first cleaned the water turbine overflowing component surface that will spray, and removes dirt and oxide skin;
Step 2 is carried out roughening treatment, makes the flow passage components surface coarsening as far as possible;
Step 3 is carried out preheating to workpiece surface, the temperature when raising WC-Co particle contacts with workpiece, and pre-heat rating should exceed marginal surface 60mm to be painted, and the control base material temperature is no more than 120 ℃;
Step 4 is carried out grinding process after the preheating, remove the surface high-temp oxide film;
Step 5 uses model to be the supersonic velocity flame plating equipment of JP-5000, selects the WC-12Co submicron powder, and oxygen flow is set in 80 m
3/ h, kerosene oil flow is 40L/h, and spray distance is 320 mm, and the speed of powder feeding is 120g/min.Spray on water turbine overflowing component surface after treatment, each spraying maximum ga(u)ge is no more than 100 μ m, after whole zone sprayed, spray to improve again the thickness of coating next time, obtain at last the coating that thickness is about 210 μ m, and coatingsurface brilliance, smooth finish can reach ▽ 6, and coating microhardness can reach HV1100.
Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, other modifications that those of ordinary skills make technical scheme of the present invention or be equal to replacement, only otherwise break away from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of the claim scope of the present invention.
Claims (5)
1. the preparation method of a water turbine overflowing component submicron erosion resistant coating is characterized in that: adopt following steps:
Step 1 is cleaned the water turbine overflowing component surface that will spray, and removes dirt and oxide skin;
Step 2 is carried out roughening treatment to the flow passage components surface; Make the flow passage components surface coarsening as far as possible;
Step 3 is carried out preheating to the flow passage components surface, the temperature when raising WC-Co particle contacts with workpiece, and pre-heat rating should exceed marginal surface 50 ~ 100 mm to be painted, and the control base material temperature is no more than 120 ℃;
Step 4 is carried out grinding process after the preheating, remove the surface high-temp oxide film;
Step 5 adopts kerosene-oxygen lance flame plating submicron WC-Co powder, and kerosene oil flow is 20 ~ 50 L/h, and oxygen flow is 50 ~ 90 m
3/ h, spray distance 300 ~ 400 mm, powder feed rate are 50 ~ 130 g/min.
2. the preparation method of a kind of water turbine overflowing component submicron erosion resistant coating according to claim 1, it is characterized in that: the grain fineness number of described submicron WC-Co powder is 0.5 ~ 1 μ m.
3. the preparation method of a kind of water turbine overflowing component submicron erosion resistant coating according to claim 1 and 2, it is characterized in that: described coat-thickness is 100 ~ 250 μ m.
4. the preparation method of a kind of water turbine overflowing component submicron erosion resistant coating according to claim 3, it is characterized in that: in the described step 5, oxygen flow is set in 56 m
3/ h, kerosene oil flow is 30 L/h, and nitrogen flow is 0.25 MPa, and spray distance is 350 mm, and the speed of powder feeding is 70 g/min, coat-thickness is 200 μ m.
5. the preparation method of a kind of water turbine overflowing component submicron erosion resistant coating according to claim 3, it is characterized in that: in the described step 5, use model to be the supersonic velocity flame plating equipment of JP-5000, oxygen flow is set in 90m
3/ h, kerosene oil flow is 40 L/h, and spray distance is 400 mm, and powder feed rate is 80 g/min, and coat-thickness is 250 μ m.
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| CN2012104375286A CN102925847A (en) | 2012-11-06 | 2012-11-06 | Method for preparing submicron abrasion and corrosion resisting coating of flow passage component of water turbine |
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| CN2012104375286A CN102925847A (en) | 2012-11-06 | 2012-11-06 | Method for preparing submicron abrasion and corrosion resisting coating of flow passage component of water turbine |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106435436A (en) * | 2016-11-18 | 2017-02-22 | 无锡明盛纺织机械有限公司 | Water turbine blade corrosion resistance and abrasion resistance method |
| CN106480395A (en) * | 2016-11-18 | 2017-03-08 | 无锡明盛纺织机械有限公司 | A kind of turbine blade anticorrosion abrasionproof etching method |
| CN106480393A (en) * | 2016-11-17 | 2017-03-08 | 无锡明盛纺织机械有限公司 | A kind of turbine blade anticorrosion abrasionproof etching method |
| CN106521395A (en) * | 2016-11-17 | 2017-03-22 | 无锡明盛纺织机械有限公司 | Anti-corrosion and anti-abrasion method for water turbine blades |
| CN106756711A (en) * | 2016-11-17 | 2017-05-31 | 无锡明盛纺织机械有限公司 | A kind of turbine blade anticorrosion abrasionproof etching method |
| CN106756725A (en) * | 2016-11-18 | 2017-05-31 | 无锡明盛纺织机械有限公司 | A kind of turbine blade anticorrosion abrasionproof etching method |
| CN106893961A (en) * | 2017-01-05 | 2017-06-27 | 扬州大学 | A kind of supersonic flame spraying method for strengthening turbine blade surface |
| CN107326406A (en) * | 2017-07-04 | 2017-11-07 | 苏州热工研究院有限公司 | A kind of protection of flow passage components narrow gap position erosion resistance layer, restorative procedure |
| CN115261768A (en) * | 2022-08-25 | 2022-11-01 | 甘肃伯骊江3D打印科技有限公司 | Supersonic spraying process for pump body |
-
2012
- 2012-11-06 CN CN2012104375286A patent/CN102925847A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 张云乾: "纳米结构WC-12Co超音速火焰喷涂层制备工艺及抗汽蚀性能研究", 《中国优秀博硕士学位论文全文数据库（硕士）工程科技II辑》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106480393A (en) * | 2016-11-17 | 2017-03-08 | 无锡明盛纺织机械有限公司 | A kind of turbine blade anticorrosion abrasionproof etching method |
| CN106521395A (en) * | 2016-11-17 | 2017-03-22 | 无锡明盛纺织机械有限公司 | Anti-corrosion and anti-abrasion method for water turbine blades |
| CN106756711A (en) * | 2016-11-17 | 2017-05-31 | 无锡明盛纺织机械有限公司 | A kind of turbine blade anticorrosion abrasionproof etching method |
| CN106435436A (en) * | 2016-11-18 | 2017-02-22 | 无锡明盛纺织机械有限公司 | Water turbine blade corrosion resistance and abrasion resistance method |
| CN106480395A (en) * | 2016-11-18 | 2017-03-08 | 无锡明盛纺织机械有限公司 | A kind of turbine blade anticorrosion abrasionproof etching method |
| CN106756725A (en) * | 2016-11-18 | 2017-05-31 | 无锡明盛纺织机械有限公司 | A kind of turbine blade anticorrosion abrasionproof etching method |
| CN106893961A (en) * | 2017-01-05 | 2017-06-27 | 扬州大学 | A kind of supersonic flame spraying method for strengthening turbine blade surface |
| CN107326406A (en) * | 2017-07-04 | 2017-11-07 | 苏州热工研究院有限公司 | A kind of protection of flow passage components narrow gap position erosion resistance layer, restorative procedure |
| CN115261768A (en) * | 2022-08-25 | 2022-11-01 | 甘肃伯骊江3D打印科技有限公司 | Supersonic spraying process for pump body |
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Application publication date: 20130213 |