CN1026422C - Anti-seepage carbon coating and coating method - Google Patents
Anti-seepage carbon coating and coating method Download PDFInfo
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- CN1026422C CN1026422C CN92105421A CN92105421A CN1026422C CN 1026422 C CN1026422 C CN 1026422C CN 92105421 A CN92105421 A CN 92105421A CN 92105421 A CN92105421 A CN 92105421A CN 1026422 C CN1026422 C CN 1026422C
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- coating
- coating layer
- seepage
- carburizing
- working lining
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Abstract
The present invention relates to an anti-carburization coating layer and a coating method thereof, which is characterized in that an anti-carburization coating material used by the coating layer comprises the following chemical components: 90 to 99.9 wt. % of Al2O3 and 0.1 to 10 wt. % of one of Ni and Al or both of the Ni and the Al. the coating layer comprises three structures, namely the structures of a single layer, double layers and three layers. The coating layer is coated with a hot spraying method. In the process of spraying, the temperature of a basal body can not be higher than 100DEGC, and the total thickness of the coating layer is smaller than 0.15mm. the present invention has obvious anti-carburization effects. The present invention is mainly suitable for large cast products, and is particularly suitable for the water cooled furnace walls of high furnaces.
Description
The invention belongs to the coating composition field, mainly be applicable to large-sized iron casting, the resistance cementation zone of particularly large-scale iron-smelting blast furnace water cooled furnace wall.
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 ironcasting.During use, water flowing in 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 steel tube surface 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., all adds 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 application CN86106703A provides at inlaid within cast iron steel backing surface inorganic carburizing coating and coated technique, for anti-carburizing, the coating that adopts Si-Fe-MgO-wilkinite and binding agent to form.
Above-mentioned anti-carburization coating all has a common characteristic with coating, 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 coated 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 class coating coatings prepared 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 anti-seepage carbon coating that the object of the present invention is to provide a kind of binder free with good resistance carburizing effect is with coating and have the goods of anti-seepage carbon coating.This coating coatings prepared can not only effectively stop the carbon in the molten iron to infiltrate in steel pipe, has higher thermal conductivity simultaneously, maintains little loosening state between foundry goods and matrix but also can make.
In order to achieve the above object, anti-seepage carbon coating of the present invention at first adopts the resistance carburizing coating of binder free with coating, and its chemical ingredients (weight %) is Al
2O
390～99.9%, any one or two kinds of 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.
The goods that have anti-seepage carbon coating of the present invention are with above-mentioned anti-seepage carbon coating coating, adopt hot-spraying techniques to be coated on the surface of steel workpiece, and coating processes comprises flame plating, electric arc spraying, arc plasma spraying.
The structure formation of this anti-seepage carbon coating has three kinds, i.e. single layer structure, bilayer structure and three-decker.
Single layer structure is meant does not have bottom, has only resistance carburizing working lining, is about to anti-seepage carbon coating of the present invention and is sprayed on surface of steel workpiece with the coating direct heat.
Bilayer structure is made up of key coat and resistance carburizing working lining.Apply one deck key coat at workpiece surface earlier, 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.
Three-decker 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 the goods of band anti-seepage carbon coating of the present invention is as follows: deoiled in workpiece (as steel pipe) surface earlier, decontamination, rust cleaning; and the processing of sandblasting; adopt methods such as hot-spraying techniques then; with anti-seepage carbon coating 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. the anti-seepage carbon coating that applies on the matrix has good resistance carburetion, and resistance carburizing effect can reach more than 99% and (refer to account for surface covered).
2. the Heat stability is good of prepared anti-seepage carbon coating, firm with matrix bond, and make foundry goods and be coated with the little loosening state of maintenance between the workpiece.
3. this coated products still has certain intensity at normal temperatures, and also higher with high base strength, therefore, in transportation and use subsequently, does not ftracture, and does not come off.
4. this coated products has higher thermal conductivity.
Embodiment
According to the chemical ingredients scope of anti-seepage carbon coating of the present invention with coating, prepared five batches of anti-seepage carbon coating coating, its chemical ingredients is as shown in table 1.Selected 20 of external diameter φ 60mm
#The carbon steel pipe fitting is made matrix and is at first carried out the degreasing processing, then sandblasting is carried out on the surface, then with the coating of five lot numbers according to coating structure shown in the table 1, be coated in five batches of steel tube surface respectively, subsequently they are 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 goods of the present invention is respond well.
Table 1 embodiment anti-seepage carbon coating chemical ingredients, body material and the coating structure of coating
Lot number matrix grade of steel coating composition (weight %) coating result
Al
2O
3Ni Al structure
1 99.1 0.1 bilayers are through metallographicobservation and table
2 20# steel, 96.1 3.9 double-deck face layered cutting chemistry
3 φ 60 * 6 90.0 10 individual layer as analysed basis surfaces are equal
4 95.0 41 three layers do not find cementation zone and
5 93 3.5 3.5 single-layer coatings and matrix bond
Firmly.
Annotate: when bilayer or three-decker, key coat and protective layer all adopt Fe-Cr-Al coating.
Claims (5)
1, a kind of anti-seepage carbon coating coating is characterized in that the chemical ingredients (weight %) of coating is: Al
2O
390～99.9%, any one or two kinds of sums are 0.1～10% among Ni or the Al.
2, a kind of goods that have anti-seepage carbon coating are matrix with the ferrous materials, it is characterized in that coating resistance carburizing working lining on matrix; The chemical ingredients of the coating that this working lining adopted (weight %) is: Al
2O
390～99.9%, any one or two kinds of sums are 0.1～10% among Ni or the Al.
3, goods according to claim 2 is characterized in that can applying one deck key coat between matrix and resistance carburizing working lining.
4, goods according to claim 3 is characterized in that also can applying layer protective layer on resistance carburizing working lining.
5,, it is characterized in that key coat and protection layer for paint all adopt soft steel or Fe-Cr-Al alloy coating according to claim 3 and 4 described goods.
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 CN1066890A (en) | 1992-12-09 |
| CN1026422C true 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) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6165597A (en) * | 1998-08-12 | 2000-12-26 | Swagelok Company | Selective case hardening processes at low temperature |
-
1992
- 1992-07-08 CN CN92105421A patent/CN1026422C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1066890A (en) | 1992-12-09 |
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