CN1066890A - Anti-seepage carbon coating and coating method - Google Patents
Anti-seepage carbon coating and coating method Download PDFInfo
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- CN1066890A CN1066890A CN92105421A CN92105421A CN1066890A CN 1066890 A CN1066890 A CN 1066890A CN 92105421 A CN92105421 A CN 92105421A CN 92105421 A CN92105421 A CN 92105421A CN 1066890 A CN1066890 A CN 1066890A
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- Coating By Spraying Or Casting (AREA)
Abstract
The present invention is anti-seepage carbon coating and sprays method.The chemical ingredients (weight %) that it is characterized in that the resistance carburizing coating that coating adopts is: Al
2O
390～99.9%, any one or two kinds of sums are 0.1～10% among Ni, the Al.This coating has three kinds of structure formations, i.e. individual layer, bilayer and three-decker.Coating adopts heat spraying method to spray, and in spraying process, substrate temperature can not be above 100 ℃.Total coating thickness＜0.15mm.It is remarkable that the present invention hinders the carburizing effect, mainly is applicable in the massive casting, is specially adapted to the blast furnace water-cooling furnace wall.
Description
The invention belongs to coating with metal and stupalith spraying.Mainly be applicable in the large-sized iron casting, be specially adapted to the water cooled furnace wall of large-scale iron-smelting blast furnace.
Resemble the water-cooling system of large and medium-sized iron-smelting blast furnace water cooled furnace wall and so on, normally weldless steel tube is directly cast in cast iron.During use, water flowing in the weldless steel tube reaches the water-cooled effect.In the castingprocesses of this water cooled furnace wall, place among the mold to the prior standard of weldless steel tube, during casting, high temperature (about 1380 ℃) molten iron directly contacts with steel pipe, and the C content of molten iron is generally 3.5～3.8%, and the carbon content of used weldless steel tube is 0.17～0.24%.Like this, in casting and process of cooling subsequently, can cause the carbon a large amount of diffusions in steel pipe in the molten iron to infiltrate, its full depth can reach several millimeters, causes the carbon content of outer surface of steel tube to improve greatly, reaches 1～3%.The sharp increase of carbon content makes the steel pipe top layer form hard and crisp cementite, causes the steel tube surface hardening to become fragile, and in use, because of the external force effect, steel pipe ruptures prematurely, leaks, and seriously influences result of use, even causes a serious accident.
In order to address the above problem, normally before casting, applied one deck coating at outer surface of steel tube in the past, steel pipe and molten iron are separated.Its coating has aluminium powder to add water glass, aluminum oxide to add that water glass, titanium dioxide mercury add water glass, silica powder adds aluminum phosphate etc., has all added different types of binding agent in these coating.Above-mentioned coating has certain resistance carburetion, but have all that the degree of depth do not wait (0.135～1.35mm) ooze C layer (" iron and steel ", 1988. № 4).Chinese patent CN86106703A provides at inlaid within cast iron steel backing surface inorganic and has oozed C coating and coated technique, for antiseepage C, and the coating that has adopted Si-Fe-MgO-wilkinite and binding agent to form.
Above-mentioned anti-carburization coating all has a common characteristic, and diverse binding agent is all arranged in coating exactly.Use this class coating, need to increase baking operation on the one hand; On the other hand, the oven dry back must strictly be controlled with the timed interval of subsequent processing, otherwise binding agent is with hydrolysis.The more important thing is, when above-mentioned coating contacts with high temperature liquid iron, easily bubble, ftracture and come off.In addition, above-mentioned coating intensity at normal temperatures is very low, easily abrades during carrying.Therefore, this type coating is difficult to obtain reliable and stable resistance carburizing effect, can not reach and hinder carburizing fully, the cementation zone of the 0.2mm left and right sides degree of depth of still having an appointment and local serious carburizing.
The object of the present invention is to provide a kind of anti-seepage carbon coating and coating method with binder free of good resistance carburizing effect, this coating can not only effectively stop the carbon in the molten iron to infiltrate in steel pipe, have higher thermal conductivity simultaneously, maintain little loosening state between foundry goods and matrix but also can make.
In order to achieve the above object, coating of the present invention at first adopts the resistance carburizing coating of binder free, and its chemical ingredients (weight %) is: Al
2O
390～99.9%, any or both sums are 0.1～10% among Ni, the Al.
Al
2O
3Wear-resistingly, anti-wash away erosion, the pyrochemistry stable performance, not with the carbon effect, and the erosion of molten metal such as anti-Fe, Co, Ni, in resistance carburetion, play a decisive role to steel pipe etc.
Add metal Ni, Ni is insensitive to C on the one hand, can play the resistance carburetion, and on the other hand, in the structural part of specific needs, Ni can improve the heat conductivility of anti-seepage carbon coating.
Add Al, also can play the effect same with Ni.
The certain content of control Ni, Al is will keep little loosening state between foundry goods and the steel pipe in order to make in a certain structural part, promptly do not produce seam between steel pipe and the cast iron, and under working conditions, the two can relative displacement.
Anti-seepage carbon coating of the present invention is with above-mentioned resistance carburizing coating, adopts hot-spraying techniques to be coated in workpiece surface, comprises flame plating, electric arc spraying, arc plasma spraying.
This anti-seepage carbon coating has single layer structure, bilayer structure and three-decker.
So-called single layer structure anti-seepage carbon coating, being meant does not have bottom, has only resistance carburizing working lining, and the present invention soon hinders carburizing coating direct heat and is sprayed on workpiece surface.
So-called bilayer structure anti-seepage carbon coating is meant earlier and applies one deck key coat at workpiece surface, and then spraying hinders the carburizing working lining on key coat.Its objective is that to make resistance carburizing working lining more firm with combining of matrix.Key coat adopts soft steel or Fe-Cr-Al alloy coating.
So-called three-decker resistance cementation zone is meant that this coating is made up of key coat, resistance carburizing working lining and protective layer.Key coat and protective layer are all selected soft steel or Fe-Cr-Al alloy coating for use.Protective layer can be protected working lining, and it is more firm to impel working lining to combine with foundry goods again.First spraying key coat, spraying resistance carburizing working lining then, spraying protective layer thereon again.
The preparation method of anti-seepage carbon coating of the present invention is as follows: deoiled in workpiece (as steel pipe) surface earlier, decontamination, rust cleaning; and carry out sandblasting; adopt hot-spraying techniques then; with resistance carburizing coating, key coat or the protection layer for paint for preparing; by its individual layer, bilayer or three-decker, preface is sprayed on them on the workpiece successively according to different needs.In spraying process, matrix (workpiece) temperature can not surpass 100 ℃, total coating thickness＜0.15mm.
Compared with prior art, the present invention has following advantage:
1, this anti-seepage carbon coating has good resistance carburetion, and resistance carburizing effect can reach more than 99% and (refer to coated area).
2, the Heat stability is good of coating in conjunction with firm, and make foundry goods and is coated with the little loosening state of maintenance between the workpiece.
3, this coating still has certain intensity at normal temperature, and also higher with high base strength, therefore, in transportation and use subsequently, does not ftracture, comes off.
4, this coating has higher thermal conductivity.
Embodiment
According to the chemical ingredients scope of resistance carburizing coating of the present invention, prepared five batches of resistance carburizing coating, its concrete chemical ingredients is as shown in table 1.Selected 20 of external diameter φ 60mm
#The carbon steel pipe fitting is made matrix, at first carries out degreasing and handles, and then sandblasting is carried out on the surface, then with the coating of five lot numbers according to the coating structure shown in the table 1, be coated in five batches of steel tube surface respectively, then they placed mold, and molten iron is injected mold.Behind 5～10 hours naturally cooling, cut foundry goods open, detect steel tube surface and have or not cementation zone, the result shows that steel tube surface is not found cementation zone, illustrates that the resistance carburizing of anti-seepage carbon coating of the present invention is respond well.
Table 1 embodiment hinders chemical ingredients, body material and the coating structure of carburizing coating
Annotate: when bilayer or three-decker, key coat and protective layer all adopt Fe-Cr-Al coating.
Claims (4)
1, a kind of anti-seepage carbon coating is characterized in that:
The chemical ingredients (weight %) of the resistance carburizing coating that A, this coating are used is: Al
2O
390～99.9%, Ni or Al add any or both sums are 0.1～10%;
The structure of B, this coating has three kinds: single layer structure, bilayer structure and three-decker; Single layer structure is single resistance carburizing working lining, and bilayer structure is key coat and resistance carburizing working lining, and three-decker is key coat, resistance carburizing working lining and protective layer.
2, coating according to claim 1 when it is characterized in that bilayer structure, is a key coat near workpiece surface, is resistance carburizing working lining on it; During three-decker, be key coat near workpiece surface, middle for hindering the carburizing working lining, skin is a protective layer.
3, according to claim 1 and 2 described coatings, it is characterized in that key coat and protection layer for paint all adopt soft steel or Fe-Cr-Al alloy, working lining adopts resistance carburizing coating of the present invention.
4, the coating method of the described anti-seepage carbon coating of a kind of claim 1, carry out sandblasting earlier with matrix (workpiece) degreasing, rust cleaning, and to the surface, adopt hot-spraying techniques to spray coating then at workpiece surface, it is characterized in that in the process of spraying that substrate temperature can not be above 100 ℃; Total coating thickness＜0.15mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92105421A CN1026422C (en) | 1992-07-08 | 1992-07-08 | Anti-seepage carbon coating and coating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92105421A CN1026422C (en) | 1992-07-08 | 1992-07-08 | Anti-seepage carbon coating and coating method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1066890A true CN1066890A (en) | 1992-12-09 |
| CN1026422C CN1026422C (en) | 1994-11-02 |
Family
ID=4941375
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92105421A Expired - Fee Related CN1026422C (en) | 1992-07-08 | 1992-07-08 | Anti-seepage carbon coating and coating method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1026422C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1325690C (en) * | 1998-08-12 | 2007-07-11 | 斯瓦戈洛克公司 | Selective case hardening processes at low temperature |
-
1992
- 1992-07-08 CN CN92105421A patent/CN1026422C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1325690C (en) * | 1998-08-12 | 2007-07-11 | 斯瓦戈洛克公司 | Selective case hardening processes at low temperature |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1026422C (en) | 1994-11-02 |
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