CN1017163B - Method for surface reinforced treatment of metal part - Google Patents
Method for surface reinforced treatment of metal partInfo
- Publication number
- CN1017163B CN1017163B CN89103019A CN89103019A CN1017163B CN 1017163 B CN1017163 B CN 1017163B CN 89103019 A CN89103019 A CN 89103019A CN 89103019 A CN89103019 A CN 89103019A CN 1017163 B CN1017163 B CN 1017163B
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- CN
- China
- Prior art keywords
- metal
- layer
- coated
- powder
- undercoat
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The present invention relates to a method for reinforcing and treating the surface of a metal component, which is characterized in that the metal surface is coated with metal ceramics to improve the service life of the metal component at high temperature by a hot spraying method, or the worn surface of the metal component working at high temperature is repaired and treated. The present invention is used for repairing the surface of a furnace roller for heat treating furnaces with the furnace temperature of 1100 DEG C to 1200 DEG C. according to the comparison trial of the furnace roller which is coated with metal ceramics and a furnace roller which is not coated with metal ceramics for one year, the rejection rate and the repair rate of the furnace roller which is not coated with metal ceramics reaches 76%, but the consumption of the surface coating of the coated roller is smaller than 0.1mm. a glaze black compact protective layer is formed on the surface of the coated roller.
Description
A kind of method at metal part surface thermospray strengthening layer, present method belong to the coating technology field of metallic substance.
As everyone knows, the high temperature down metal parts of work use expensive heat-stable material mostly, and for example high temperature steel such as Ni-Cr is made, and the hot operation life-span of improving these parts, very big meaning saved material to reduction factory products cost.The continuous furnace furnace roller used of steel mill particularly and since working conditions abominable damage particularly serious.Therefore, need the hot operation metal part surface that has worn and torn is carried out repair process.
Also have before the present invention at metal part surface spraying high-melting-point, the method for surface hardening of hot strength alloy.For example at heating furnace roller surface spraying Ni-Al alloy layer hot strength alloy layer, but because surface strengthen layer and body material bonding properties are poor, strengthening layer is easy to peel off during use, the spy opens clear 49-22343 and has disclosed a kind of elder generation and combine good Ni-Mo undercoat with body material at roll surface matrix spraying one deck, and then spraying layer of Ni-Al alloy coat, the method of the pure Al strengthening layer of final spraying, slowed down the problem of peeling off, but this art breading complexity, behind spraying bottom coating, to carry out 50 hours heat treatment step of 1000 ℃ of insulations, behind the spray intensified layer, carrying out the secular diffusion annealing of high temperature again handles, therefore technology can not be breathed out by a gas, and the cost height, energy consumption is big.
The object of the invention will provide a kind of technology easy exactly, method for surface reinforced treatment of metal part with low cost, also promptly by selecting suitable coating compounds material and coated order, as long as adopt simple thermospray means, just can be good at metallic surface coated and body material bonding properties, have the strengthening layer of high-temperature working performance again.
Why the metal surface enhanced layer of institute's coated is easy to peel off under hot operation, and its major cause is that two kinds of material coefficient of thermal expansion coefficient differences cause.The present invention is except having the undercoat of well attached performance at substrate material surface coated one deck and body material for this reason, also according to the thermal expansion coefficient difference size between body material and the selected strengthening layer, at the transition layer that sprays on the undercoat more than one deck.It is big more that the coefficient of expansion between body material and the strengthening layer differs, then the number of plies of transition layer is many more, the thermal expansivity of selected buffer layer material will be between the thermal expansivity of body material and strengthening layer, and the thermal expansivity of each buffer layer material is an increasing or decreasing, in thermal spray process, also can produce diffusion and osmosis between each layer, therefore, after taking this measure, it is poor just to solve between body material and strengthening layer bonding properties, is easy to the problem of peeling off under the hot operation.
Process characteristic of the present invention is to combine good metal, alloy or composition metal with body material as undercoat at metal part surface spraying one deck, spray the above sintering metal transition layer of one deck at least then, spray coating metal ceramic strengthening layer again, brush the hole agent at last, hole on the coating is carried out sealing of hole handle, the centre need not to carry out any heat treatment step.
For body material was the Ni-Cr series heat-resistant steel, the undercoat material can adopt metal, alloy, composition metals such as Ni, Cr, Ni-Cr, Ni-Cr-Al, Ni-Al, Ni-Mo.The thickness of undercoat generally is controlled between 0.05～0.15 millimeter, the blocked up bonding strength that can reduce undercoat self, cross the thin effect that does not have undercoat, transition layer can adopt Ni, Mo, metal-powder and Al such as Al, Si, Ti, Zr, the composite metal ceramic end spraying that oxide ceramics such as Mg are formed forms, the spraying transition layer is intended to reduce the thermal expansivity of great disparity between body material and the strengthening layer, to spray the above transition layer of one deck for this reason, thermal expansivity between each selected transition layer will successively decrease or increase progressively successively, also be that its coefficient of expansion of the first layer transition layer will be near undercoat, and the coefficient of expansion of last one deck transition layer will be near strengthening layer, the number of plies of transition layer is mainly looked the thermal expansivity great disparity degree between body material and the selected strengthening layer, differing greatly, then the number of plies is some more, the thickness of each transition layer spraying generally is controlled between 0.05～0.10 millimeter, and is thin excessively, blocked up all undesirable.
Strengthening layer can adopt metal-powder and Si, Cr, the oxide compound of Ti or the composite cermets of carbide ceramics powder constituent such as NiMoAl, selection principle is heat-resistant stability and the good cermet material of high temperature abrasion resistance, the coated gauge control is crossed thin poor, the blocked up then strengthening layer of result of use self bonding properties and is descended 0.07～0.20 millimeter scope.
Owing to there is hole to exist in the sintering metal strengthening layer, therefore also need to carry out sealing of hole and handle, hole sealing agent is selected all kinds of resistant to elevated temperatures inorganic sealing hole materials for use.
Each coating can adopt various spraying methods such as plasma or flame plating once to spray successively at substrate material surface and form, and carries out sealing of hole after the cooling again and handles.
The present invention also can be applicable to the parts that body material is straight carbon steel, stainless steel etc.
Be embodiments of the invention below.
The processing of thermospray strengthening layer is carried out on surface at 230 millimeters old furnace rollers of process furnace of φ, and furnace roller material is Ni
20Cr
25Si
2
Spray layer of Ni CrAl undercoat earlier on the furnace roller surface, and then spray three layers of NiMo-Al
2O
3Ceramic-metallic transition layer, the first layer transition layer NiMo metal-powder is 70%, Al
2O
3Be 30%, second layer transition layer NiMo metal-powder is 50%, Al
2O
3Be that 70%, the three layer of transition layer NiMo metal-powder is 30%, Al
2O
3Be 70%, spraying one deck AlMo metal-powder at last again is 10%, Cr
2O
3It is 90% sintering metal strengthening layer; Each sprayed coating thickness all is controlled at 0.1 millimeter, and adopts flame plating, and one deck hole sealing agent is brushed on the surface again.
To be installed in furnace temperature through the new furnace roller of the no strengthening layers in the old furnace roller after the above-mentioned spraying reparation and 21 surface simultaneously and be in 1100～1200 ℃ the stainless-steel pipe solution treatment continuous furnace and use; on probation through contrast in a year; new furnace roller successively has 5 explosions; change midway; condemnation factor is 23.81%; off-test; there are 11 to need to change maintenance on inspection again; scrap with repair rate up to 76%; and three old rollers through surperficial coated strengthening layer; after using in 1 year, the surface has formed one deck in conjunction with the fine and close protective layer of very firm glaze black.After testing, original coat-thickness is about 0.5 millimeter (coated total thickness), and using the back coat-thickness is 0.40～0.45 millimeter.About 0.6 millimeter to the body material diffusion depth of coating metal, coating loss has improved the hot operation life-span of furnace roller greatly less than 0.1 millimeter.
Claims (4)
1, a kind of method at metal part surface thermospray strengthening layer, coated metal alloy undercoat on metal matrix material, it is characterized in that, at the sintering metal transition layer more than coated one deck successively between metal alloy undercoat and the strengthening layer, selected sintering metal transition layer, its thermal expansivity are between metal alloy undercoat and strengthening layer, and the thermal expansivity of each buffer layer material needs increasing or decreasing, and then coated layer of metal ceramic reinforced layer, brushing hole sealing agent sealing of hole more at last; Primer thickness is controlled at 0.05～0.15 millimeter, and each transition region thickness is controlled at 0.05～0.10 millimeter, and the strengthening layer gauge control is at 0.07～0.20 millimeter.
2, by the described method of claim 1, it is characterized in that body material is the Ni-Cr series heat-resistant steel, can adopt Ni, Cr, Ni-Cr, Ni-Cr-Al, Ni-Al, metals such as Ni-Mo, alloy, the dusty spray of composition metal is as the undercoat material, can adopt Ni, Mo, metal-powder and Al such as Al, Si, Ti, Zr, the composite metal ceramic end that oxide ceramics such as Mg are formed is as each buffer layer material, can adopt Ni, Mo, metal-powder and Si such as Al, Ti, the composite cermet of the oxide compound of Cr or carbide ceramics powder constituent is as the strengthening layer material, and hole sealing agent can adopt all kinds of resistant to elevated temperatures inorganic sealing hole materials.
3, by the described method of claim 2, it is characterized in that body material is Ni
20Cr
25Si
2The time, select for use NiCrAl as the undercoat material, transition layer is selected three layers of NioAl for use
2O
3Sintering metal, the first layer NiMo metal-powder is 70%, Al
2O
3Be 30%, second layer NiMo metal-powder is 50%, Al
2O
3Be that 50%, the three layer of NiMo metal-powder is 30%, Al
2O
3Be 70%, it is 10% that strengthening layer is selected the AlMo metal-powder for use, Cr
2O
3It is 90% sintering metal.
4, by the described method of claim 3, it is characterized in that the spraying total thickness is about 0.5 millimeter, each layer thickness of metal alloy undercoat, three layers of transition layer, working lining is controlled at 0.1 millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN89103019A CN1017163B (en) | 1989-05-08 | 1989-05-08 | Method for surface reinforced treatment of metal part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN89103019A CN1017163B (en) | 1989-05-08 | 1989-05-08 | Method for surface reinforced treatment of metal part |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1047113A CN1047113A (en) | 1990-11-21 |
| CN1017163B true CN1017163B (en) | 1992-06-24 |
Family
ID=4854946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN89103019A Expired CN1017163B (en) | 1989-05-08 | 1989-05-08 | Method for surface reinforced treatment of metal part |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1017163B (en) |
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| JP2007211293A (en) | 2006-02-09 | 2007-08-23 | Fujimi Inc | Spray deposit film, and powder for thermal spraying |
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-
1989
- 1989-05-08 CN CN89103019A patent/CN1017163B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1047113A (en) | 1990-11-21 |
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