CN102277551A - Spraying material for steel sealing face surface coating for valves in power plants and spraying method thereof - Google Patents
Spraying material for steel sealing face surface coating for valves in power plants and spraying method thereof Download PDFInfo
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- CN102277551A CN102277551A CN201110280582XA CN201110280582A CN102277551A CN 102277551 A CN102277551 A CN 102277551A CN 201110280582X A CN201110280582X A CN 201110280582XA CN 201110280582 A CN201110280582 A CN 201110280582A CN 102277551 A CN102277551 A CN 102277551A
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Abstract
The invention discloses a spraying material for steel sealing face surface coating for valves in power plants and a spraying method thereof and relates to a spraying material and a spraying method thereof. The invention aims to solve the problem of high cost of an overlaying technique which is to overlay a layer of protective material on the surface of a steel seal face of a valve in a power plant. The spraying material is prepared from 80 to 90 weight parts of nano Al2O3, 10 to 15 weight parts of TiO2, 0.5 to 7 weight parts of ZrO2 and 0.5 to 4 weight parts of nano CeO2. The method which is to perform plasma spraying of the spraying material onto the surface of the steel sealing face of the valve in the power plant comprises the following steps: I, pretreating; II, preparing a spraying material; and III, spraying. The method is mainly used to prepare the spraying material for the steel sealing face surface coating for the valves in the power plants and spray a layer of protective coating on the surfaces of the steel sealing faces of the valves in the power plants.
Description
Technical field
The present invention relates to a kind of spray material and spraying method thereof
Background technology
Power station valve is used comparatively extensive, and number of applications is bigger, a 300MW power station supercritical unit, and about 2000 of supporting valve wherein 1/10 is operated in supercritical state, the Working environment very severe.As China's present stage supercritical unit, the typical steam parameter of stop valve work is 25.4MPa/566 ℃/566 ℃, and the typical steam parameter of ultra supercritical unit stop valve work has reached 26.25MPa/600 ℃/600 ℃.Power station high-temperature high pressure valve under this Working environment, the working conditions of its trim is quite abominable, and therefore the performance for trim has higher requirement.In order to prolong the work-ing life of power station valve under operating mode, the performance of trim will directly influence the security of engineering in using, and therefore improving power station valve is one of important developing direction of power station valve industry with steel trim surface abrasion resistance damage, performance such as corrosion-resistant.But the steel of preparation power station valve can not satisfy the demand, therefore adopt process for modifying surface power station valve with steel trim surface on formation one deck hard coat solve this problem, the existing technique for overlaying that adopts at power station valve built-up welding one deck cobalt-base alloy on the steel trim surface more, play and improve power station valve steel trim surface abrasion resistance damage and corrosion resistance nature, and the country that China is cobalt resource extremely to be lacked, the cobalt ore reserves are less than 2% world saving, required cobalt resource is mainly by import cobalt concentrate and recycling cobaltiferous waste material, so cost is very high.Therefore have now power station valve with steel trim surface on the technique for overlaying of built-up welding one deck protective material have the high problem of cost.
Summary of the invention
The present invention to solve have now power station valve with steel trim surface on the technique for overlaying of built-up welding one deck protective material have the high problem of cost, and a kind of spray material is provided and power station valve is carried out the method for plasma spraying with steel trim surface.
A kind of power station valve that is used for uses the spray material of steel trim top coat by weight by 80～90 parts of nanometer Al
2O
3, 10～18 parts of nano-TiOs
2, 0.5～5 part of nanometer ZrO
2With 0.5～5 part of nano Ce O
2Be prepared from; The described power station valve that is used for is 10 μ m～45 μ m with the particle diameter of the spray material of steel trim top coat.
A kind of spraying method that is used for power station valve with the spray material of steel trim top coat, specifically finish according to the following steps: one, pre-treatment: at first the power station valve to spraying carries out surface cleaning processing → sandblast roughening treatment → substrate preheating → spraying NiCrAlY with steel trim surface, promptly obtains the sealing of pre-treatment power station valve; Two, preparation spray material: take by weighing 80～90 parts of nanometer Al by weight
2O
3, 10～18 parts of nano-TiOs
2, 0.5～7 part of nanometer ZrO
2With 0.5～4 part of nano Ce O
2, fully mixing → granulation is prepared into the spray material that particle diameter is 10 μ m～45 μ m then; Three, spraying: adopting the method for plasma spraying is that 60～70V, electric current are that 550～650A, spray distance are that 80～120mm, powder feeding rate are that 1.4～2.3kg/h, main gas Ar flow are 80～160SCFH and auxilliary gas H at voltage
2Flow is that under the condition of 40～70SCFH step 2 to be prepared particle diameter be that the spray material of 10 μ m～45 μ m uniformly sprays pre-treatment power station valve that step 1 obtains with on the steel trim surface, promptly finish adopt power station valve with the spray material of steel trim top coat to the plasma spraying of power station valve with steel trim surface; Described power station valve is to adopt 12CrMoV steel or 25# steel to form fully.
Advantage of the present invention: one, a kind of power station valve that is used for of the present invention is compared with existing technique for overlaying with the spraying method of the spray material of steel trim top coat, do not adopt cobalt metal element, avoided because of using cobalt metal element to cause the high problem of cost; Two, it is wear-resistant and corrosion-resistant with the coating of the spray material formation of steel trim top coat to adopt the present invention's preparation to be used for power station valve; Three, the present invention adopts plasma spraying method, the efficient height, and power station valve distortion is little, the coating densification that obtains, and the coating that obtains and matrix bond are good, and coating does not come off.
Description of drawings
Fig. 1 is that test one is at the 100 times sem photographs of power station valve with the supercoat of steel trim surface spraying; Fig. 2 is that test one adopts power station valve that the 12CrMoV steel is equipped with and test one at the frictional coefficient graphic representation of power station valve with the supercoat of steel trim surface spraying, A among Fig. 2 represents is the frictional coefficient curve that the power station valve that the 12CrMoV steel is equipped with is adopted in test one, and what the B among Fig. 2 represented is that test one is at the frictional coefficient curve of power station valve with the supercoat of steel trim surface spraying; Fig. 3 tests one and adopts power station valve that the 12CrMoV steel is equipped with and test one at the galvanic corrosion graphic representation of power station valve with the supercoat of steel trim surface spraying, A among Fig. 3 represents is the galvanic corrosion curve that the power station valve that the 12CrMoV steel is equipped with is adopted in test one, and what the B among Fig. 3 represented is that test one is at the galvanic corrosion curve of power station valve with the supercoat of steel trim surface spraying; Fig. 4 is that test two is at the 100 times sem photographs of power station valve with the supercoat of steel trim surface spraying; Fig. 5 is that test two adopts power station valve that the 25# steels are equipped with and test two at the frictional coefficient graphic representation of power station valve with the supercoat of steel trim surface spraying, A among Fig. 5 represents is the frictional coefficient curve that the power station valve that the 25# steels are equipped with is adopted in test two, and what the B among Fig. 5 represented is that test two is at the frictional coefficient curve of power station valve with the supercoat of steel trim surface spraying; Fig. 6 is that test two adopts power station valve that the 25# steels are equipped with and test two at the galvanic corrosion graphic representation of power station valve with the supercoat of steel trim surface spraying; A among Fig. 6 represents is the galvanic corrosion curve that the power station valve that the 25# steels are equipped with is adopted in test two, and what the B among Fig. 6 represented is that test two is at the galvanic corrosion curve of power station valve with the supercoat of steel trim surface spraying.
Embodiment
Embodiment one: present embodiment is a kind of spray material that is used for power station valve with steel trim top coat, by weight by 80～90 parts of nanometer Al
2O
3, 10～18 parts of nano-TiOs
2, 0.5～7 part of nanometer ZrO
2With 0.5～4 part of nano Ce O
2Be prepared from.
Present embodiment is described, and to be used for power station valve be 10 μ m～45 μ m with the particle diameter of the spray material of steel trim top coat.
The coating that the spray material that adopts present embodiment to prepare forms is wear-resistant and corrosion-resistant.
Embodiment two: the difference of present embodiment and embodiment one is: a kind of spray material is by weight by 82～85 parts of nanometer Al
2O
3, 12～14 parts of nano-TiOs
2, 1～5 part of nanometer ZrO
2With 1～3 part of nano Ce O
2Be prepared from.Other is identical with embodiment one.
Embodiment three: present embodiment is a kind of spraying method that is used for power station valve with the spray material of steel trim top coat, specifically finishes according to the following steps:
One, pre-treatment: at first the power station valve to spraying carries out surface cleaning processing → sandblast roughening treatment → substrate preheating → spraying NiCrAlY (as bottom) with steel trim surface, promptly obtains the sealing of pre-treatment power station valve; Two, preparation spray material: take by weighing 80～90 parts of nanometer Al by weight
2O
3, 10～18 parts of nano-TiOs
2, 0.5～7 part of nanometer ZrO
2With 0.5～4 part of nano Ce O
2, fully mixing → granulation is prepared into the spray material that particle diameter is 10 μ m～45 μ m then; Three, spraying: adopting the method for plasma spraying is that 60～70V, electric current are that 550～650A, spray distance are that 80～120mm, powder feeding rate are that 1.4～2.3kg/h, main gas Ar flow are 80～160SCFH (1SCFH=0.472L/min) and auxilliary gas H at voltage
2Flow is that under the condition of 40～70SCFH (1SCFH=0.472L/min) step 2 to be prepared particle diameter be that the spray material of 10 μ m～45 μ m uniformly sprays pre-treatment power station valve that step 1 obtains with on the steel trim surface, promptly finish adopt power station valve with the spray material of steel trim top coat to the plasma spraying of power station valve with steel trim surface.
The described power station valve of present embodiment is to adopt 12CrMoV steel or 25# steel to form fully.
A kind of spray material that adopts of present embodiment is compared with existing technique for overlaying power station valve carries out plasma spraying with steel trim surface method, does not adopt cobalt metal element, has avoided because of using cobalt metal element to cause the high problem of cost.
The coating that the spray material that adopts present embodiment to prepare forms is wear-resistant and corrosion-resistant.
Present embodiment adopts plasma spraying method, the efficient height, and the power station valve distortion is little, the coating densification that obtains, and the coating that obtains and matrix bond are good, and coating does not come off.
Adopt following verification experimental verification invention effect:
Test one: a kind of spray material that adopts carries out the method for plasma spraying to power station valve with steel trim surface, specifically finishes according to the following steps:
One, pre-treatment: at first the power station valve to spraying carries out surface cleaning processing → sandblast roughening treatment → substrate preheating → spraying NiCrAlY (as bottom) with steel trim surface, promptly obtains the sealing of pre-treatment power station valve; Two, preparation spray material: take by weighing 82.65 parts of nanometer Al by weight
2O
3, 12.35 parts of nano-TiOs
2, 3.5 parts of nanometer ZrO
2With 1.5 parts of nano Ce O
2, fully mixing → granulation is prepared into the spray material that particle diameter is 10 μ m～45 μ m then; Three, spraying: adopting the method for plasma spraying is that 65V, electric current are that 600A, spray distance are that 100mm, powder feeding rate are that 1.8kg/h, main gas Ar flow are 120SCFH (1SCFH=0.472L/min) and auxilliary gas H at voltage
2Flow is that under the condition of 55SCFH (1SCFH=0.472L/min) step 2 to be prepared particle diameter be that the spray material of 10 μ m～45 μ m uniformly sprays pre-treatment power station valve that step 1 obtains with on the steel trim surface, promptly finish adopt power station valve with the spray material of steel trim top coat to the plasma spraying of power station valve with steel trim surface.
The described power station valve of present embodiment is to adopt the 12CrMoV steel to form fully.
The supercoat that present embodiment is sprayed with steel trim surface at power station valve adopts scanning electronic microscope to scan (SEM); obtain 100 times of scanning electron microscope Fig. 1; as seen in Figure 1; coatingsurface is uneven; this is because the feeding particle under the high-speed motion; under the high temperature of plasma flame flow; strike matrix surface rapidly; melt granules is through bump, distortion; form the flats structure; overlap joint layer by layer, other has the molten or fritting state particle of minority fast after the cooling, directly is embedded in wherein.Rong nano particle both can not absorb the energy that crack propagation discharges, and can also stop crackle continuation expansion and make its skew, produced the effect of malleableize.
Adopt power station valve that the 12CrMoV steel is equipped with and present embodiment at the frictional coefficient of power station valve by detecting present embodiment with the supercoat of steel trim surface spraying, detected result as shown in Figure 2, wherein the A among Fig. 2 represents is the frictional coefficient curve that present embodiment adopts the power station valve that the 12CrMoV steel is equipped with, what the B among Fig. 2 represented is that present embodiment is at the frictional coefficient curve of power station valve with the supercoat of steel trim surface spraying, can find that by the A among Fig. 2 the frictional coefficient of the power station valve that present embodiment employing 12CrMoV steel is equipped with is in the initial running-in stage, increase to more than 0.55 rapidly, arrive the uniform wear stage afterwards, frictional coefficient fluctuates between 0.45～0.55; And can find that by the B among Fig. 2 present embodiment is shorter with the initial running-in of the frictional coefficient time in stage of the supercoat of steel trim surface spraying at power station valve, after frictional coefficient rises to 0.45, be in steady wearing and tearing always, fluctuation range is very little, illustrate that present embodiment is comparatively smooth with the supercoat of steel trim surface spraying at power station valve, its surfaceness can cause the fluctuation of frictional coefficient, but the overall wear performance is not had influence substantially; And can learn significantly that from Fig. 2 present embodiment adopts the frictional coefficient of power station valve that 12CrMoV steel be equipped with little with the frictional coefficient of the supercoat of steel trim surface spraying than present embodiment at power station valve, so present embodiment is good with the supercoat abrasion resistance properties of steel trim surface spraying at power station valve.
Adopt power station valve that the 12CrMoV steel is equipped with and present embodiment at the electrochemical corrosion performance of power station valve by detecting present embodiment with the supercoat of steel trim surface spraying; detected result as shown in Figure 3; wherein the A among Fig. 3 represents is the galvanic corrosion curve that present embodiment adopts the power station valve that the 12CrMoV steel is equipped with; what the B among Fig. 3 represented is that present embodiment is at the galvanic corrosion curve of power station valve with the supercoat of steel trim surface spraying; by observing A and the B curve among Fig. 3, can learn clearly that the electrochemical corrosion performance of the power station valve that present embodiment is equipped with than present embodiment employing 12CrMoV steel with the electrochemical corrosion performance of the supercoat of steel trim surface spraying at power station valve is superior.
Test two: a kind of spray material that adopts carries out the method for plasma spraying to power station valve with steel trim surface, specifically finishes according to the following steps:
One, pre-treatment: at first the power station valve to spraying carries out surface cleaning processing → sandblast roughening treatment → substrate preheating → spraying NiCrAlY (as bottom) with steel trim surface, promptly obtains the sealing of pre-treatment power station valve; Two, preparation spray material: take by weighing 82.65 parts of nanometer Al by weight
2O
3, 12.35 parts of nano-TiOs
2, 3.5 parts of nanometer ZrO
2With 1.5 parts of nano Ce O
2, fully mixing → granulation is prepared into the spray material that particle diameter is 10 μ m～45 μ m then; Three, spraying: adopting the method for plasma spraying is that 65V, electric current are that 600A, spray distance are that 100mm, powder feeding rate are that 1.8kg/h, main gas Ar flow are 120SCFH (1SCFH=0.472L/min) and auxilliary gas H at voltage
2Flow is that under the condition of 55SCFH (1SCFH=0.472L/min) step 2 to be prepared particle diameter be that the spray material of 10 μ m～45 μ m uniformly sprays pre-treatment power station valve that step 1 obtains with on the steel trim surface, promptly finish adopt power station valve with the spray material of steel trim top coat to the plasma spraying of power station valve with steel trim surface.
The described power station valve of present embodiment is to adopt the 25# steel to form fully.
The supercoat that present embodiment is sprayed with steel trim surface at power station valve adopts scanning electronic microscope to scan (SEM); obtain 100 times of scanning electron microscope Fig. 4; as seen in Figure 4; coatingsurface is uneven; this is because the feeding particle under the high-speed motion; under the high temperature of plasma flame flow; strike matrix surface rapidly; melt granules is through bump, distortion; form the flats structure; overlap joint layer by layer, other has the molten or fritting state particle of minority fast after the cooling, directly is embedded in wherein.Rong nano particle both can not absorb the energy that crack propagation discharges, and can also stop crackle continuation expansion and make its skew, produced the effect of malleableize.
Adopt power station valve that the 25# steel is equipped with and present embodiment at the frictional coefficient of power station valve by detecting present embodiment with the supercoat of steel trim surface spraying, detected result as shown in Figure 5, wherein the A among Fig. 5 represents is the frictional coefficient curve that present embodiment adopts the power station valve that the 25# steel is equipped with, what the B among Fig. 5 represented is that present embodiment is at the frictional coefficient curve of power station valve with the supercoat of steel trim surface spraying, the frictional coefficient that can find the power station valve that present embodiment employing 25# steel is equipped with by the A among Fig. 5 changes 0.38～0.5, and is bigger between floating zone; And can find that by the B among Fig. 5 present embodiment is more steady with the frictional coefficient of the supercoat of steel trim surface spraying at power station valve, after wear stage was stablized in arrival, in 0.4 fluctuation up and down, scope was less.Therefore the stable friction factor of the power station valve that is equipped with than present embodiment employing 25# steel with the frictional coefficient of the supercoat of steel trim surface spraying at power station valve of present embodiment; degree of fluctuation is little; be beneficial to coating and, help the raising of wear resistance grinding the anti-attrition of material.
Adopt power station valve that the 25# steel is equipped with and present embodiment at the electrochemical corrosion performance of power station valve by detecting present embodiment with the supercoat of steel trim surface spraying; detected result as shown in Figure 6; wherein the A among Fig. 6 represents is the galvanic corrosion curve that present embodiment adopts the power station valve that the 25# steel is equipped with; what the B among Fig. 6 represented is that present embodiment is at the galvanic corrosion curve of power station valve with the supercoat of steel trim surface spraying; by observing A and the B curve among Fig. 6, can learn clearly that the electrochemical corrosion performance of the power station valve that present embodiment is equipped with than present embodiment employing 25# steel with the electrochemical corrosion performance of the supercoat of steel trim surface spraying at power station valve is superior.
Embodiment four: the difference of present embodiment and embodiment three is: take by weighing 82～85 parts of nanometer Al in the step 2 by weight
2O
3, 12～14 parts of nano-TiOs
2, 1～5 part of nanometer ZrO
2With 1～3 part of nano Ce O
2, fully mixing → granulation is prepared into the spray material that particle diameter is 10 μ m～45 μ m then.Other is identical with embodiment three.
Claims (4)
1. a spray material that is used for power station valve with steel trim top coat is characterized in that being used for power station valve and uses the spray material of steel trim top coat by weight by 80～90 parts of nanometer Al
2O
3, 10～18 parts of nano-TiOs
2, 0.5～5 part of nanometer ZrO
2With 0.5～5 part of nano Ce O
2Be prepared from; The described power station valve that is used for is 10 μ m～45 μ m with the particle diameter of the spray material of steel trim top coat.
2. a kind of spray material that is used for power station valve with steel trim top coat according to claim 1 is characterized in that being used for power station valve and uses the spray material of steel trim top coat by weight by 82～85 parts of nanometer Al
2O
3, 12～14 parts of nano-TiOs
2, 1～5 part of nanometer ZrO
2With 1～3 part of nano Ce O
2Be prepared from.
3. utilize the described a kind of spraying method that is used for power station valve with the spray material of steel trim top coat of claim 1, it is characterized in that being used for power station valve and specifically finish according to the following steps with the spraying method of the spray material of steel trim top coat:
One, pre-treatment: at first the power station valve to spraying carries out surface cleaning processing → sandblast roughening treatment → substrate preheating → spraying NiCrAlY with steel trim surface, promptly obtains the sealing of pre-treatment power station valve; Two, preparation spray material: take by weighing 80～90 parts of nanometer Al by weight
2O
3, 10～18 parts of nano-TiOs
2, 0.5～7 part of nanometer ZrO
2With 0.5～4 part of nano Ce O
2, fully mixing → granulation is prepared into the spray material that particle diameter is 10 μ m～45 μ m then; Three, spraying: adopting the method for plasma spraying is that 60～70V, electric current are that 550～650A, spray distance are that 80～120mm, powder feeding rate are that 1.4～2.3kg/h, main gas Ar flow are 80～160SCFH and auxilliary gas H at voltage
2Flow is that under the condition of 40～70SCFH step 2 to be prepared particle diameter be that the spray material of 10 μ m～45 μ m uniformly sprays pre-treatment power station valve that step 1 obtains with on the steel trim surface, promptly finish adopt power station valve with the spray material of steel trim top coat to the plasma spraying of power station valve with steel trim surface; Described power station valve is to adopt 12CrMoV steel or 25# steel to form fully.
4. a kind of spraying method that is used for power station valve with the spray material of steel trim top coat according to claim 3 is characterized in that taking by weighing by weight in the step 2 82～85 parts of nanometer Al
2O
3, 12～14 parts of nano-TiOs
2, 1～5 part of nanometer ZrO
2With 1～3 part of nano Ce O
2, fully mixing → granulation is prepared into the spray material that particle diameter is 10 μ m～45 μ m then.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110280582XA CN102277551A (en) | 2011-09-21 | 2011-09-21 | Spraying material for steel sealing face surface coating for valves in power plants and spraying method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110280582XA CN102277551A (en) | 2011-09-21 | 2011-09-21 | Spraying material for steel sealing face surface coating for valves in power plants and spraying method thereof |
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| CN102277551A true CN102277551A (en) | 2011-12-14 |
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|---|---|---|---|
| CN201110280582XA Pending CN102277551A (en) | 2011-09-21 | 2011-09-21 | Spraying material for steel sealing face surface coating for valves in power plants and spraying method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107699845A (en) * | 2017-09-11 | 2018-02-16 | 常熟市双羽铜业有限公司 | A kind of automatically cleaning high corrosion-resistant steel construction piece |
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2011
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| CN101412618A (en) * | 2007-06-19 | 2009-04-22 | 英孚拉玛特公司 | Superfine ceramic thermal spray feedstock comprising ceramic oxide grain growth inhibitor and methods of making |
| CN101683612A (en) * | 2008-08-26 | 2010-03-31 | 肖特公开股份有限公司 | Thermoplastic coating |
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| Title |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107699845A (en) * | 2017-09-11 | 2018-02-16 | 常熟市双羽铜业有限公司 | A kind of automatically cleaning high corrosion-resistant steel construction piece |
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Application publication date: 20111214 |