CN102161595A - Static-centrifugal composite method for preparing ceramic lining coating of steel tube - Google Patents
Static-centrifugal composite method for preparing ceramic lining coating of steel tube Download PDFInfo
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- CN102161595A CN102161595A CN2011100372547A CN201110037254A CN102161595A CN 102161595 A CN102161595 A CN 102161595A CN 2011100372547 A CN2011100372547 A CN 2011100372547A CN 201110037254 A CN201110037254 A CN 201110037254A CN 102161595 A CN102161595 A CN 102161595A
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- steel tube
- steel pipe
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Abstract
The invention relates to a static-centrifugal composite method for preparing a ceramic lining coating of a steel tube. The prepared steel tube is mainly applied in the fields of metallurgy, mine, chemical industry, energy and the like. The method comprises the following process steps of: vertically placing a steel tube, filling an aluminum heat flux and an igniter in the tube, putting the lower part of the steel tube into a rolling bearing which has the effect of positioning, blocking the bottom of the steel tube by using an asbestos pad, and clamping the upper part of the steel tube on a bench drill, wherein the rotating torque of the steel tube is provided by the bench drill; and preheating the steel tube by adopting a resistance type heating ring, igniting the igniter in the tube after the steel tube is preheated, and turning on a switch of the bench drill to rotate the steel tube, so that the ignited igniter ignites the aluminum heat flux during the rotation of the steel tube to ensure that a thermit reaction of the aluminum heat flux is performed in the tube according to a formula of 2Al+Fe2O3=2Fe+Al2O3+836kJ, and a product of the thermit reaction is adhered to the wall of the tube under gravity and centrifugal action so as to finish the preparation of the ceramic lining coating of the steel tube. The ceramic coating prepared by the method has a gradient structure, a transition layer is thicker, the thermal shock of the coating is good, the compactness of the ceramic coating is high, the distribution of the coating along wall thickness is uniform, and surface quality is good.
Description
Technical field
The present invention relates to a kind of method for preparing the ceramic-lined coating of steel pipe at steel pipe internal-surface.The steel pipe of preparation is mainly used in fields such as metallurgy, mine, chemical industry and the energy.Belong to from spreading the coating technology field.
Background technology
Many departments such as metallurgy, mine, chemical industry and the energy need a large amount of wear-resisting, anti-corrosion and heat-resisting pipeline materials.Though high temperature alloy pipes, glass-ceramic tubre and vitrified pipe are widely-used in above-mentioned field, the pipeline material that can satisfy wear-resistant, shock-resistant, corrosion-resistant and high temperature resistant requirement simultaneously is still the key subjects that need to be resolved hurrily.Conventional method is to make ceramic-lined steel pipe with plasma spraying, cast setting etc., because the aspects such as quality, cost, technology are difficult to realize batch production.The production that appears as the ceramic-lined pipe of long size of self propagating high temperature synthetic technology provides brand-new approach.At present, the method that spreads certainly for preparing ceramic-lined coating at steel pipe internal-surface has static self-spreading method and centrifugal from spreading method.Centrifugal is the coating densification from the advantage that spreads method, and surface quality is good, and coating is evenly distributed along inner wall thickness.Shortcoming is that the transition layer between top layer pottery and the steel matrix is very little, and the thermal shock resistance of coating is relatively poor.The advantage of static self-spreading method is the ceramic coating structure in gradient of preparation, and transition layer is thicker, and thermal shock resistance is better, and shortcoming is that the coating density is lower.This is just so that the Ceramic Lined Pipes Made of preparation has been subjected to very big restriction in actual applications.
Summary of the invention
The objective of the invention is to overcome the relatively poor and centrifugal shortcoming that transition layer is thin between ceramic coating that spreads and matrix, bonding strength is not high of coating compactness of above-mentioned static self-spreading method preparation, a kind of static state-centrifugal composite algorithm that integrates the ceramic-lined coating of preparation steel pipe of above two kinds of method advantages is provided.
The object of the present invention is achieved like this: a kind of static-centrifugal composite method for preparing the Ceramic lined pipe coating, described method comprises following processing step: steel pipe is erected put, fill up aluminum heat flux and igniting agent in the pipe, the rolling bearing that plays the role of positioning is put in the steel pipe bottom, the steel pipe bottom is blocked with asbestos pad, steel pipe top is sandwiched on the bench drill, and the steel pipe rotating torque is provided by bench drill; Adopt resistance-type heating collar preheated steel pipe, after the steel pipe preheating, light the igniting agent in the pipe, open the bench drill switch, make steel pipe rotary, in the steel pipe rotary, the igniting agent of the being lighted aluminum heat flux that ignites again, make its in pipe by formula 2Al+Fe
2O
3=2Fe+ Al
2O
3Thermit reaction takes place in+836 kJ, and the thermit reaction product sticks at tube wall under gravity and centrifugal action, finishes the preparation of Ceramic lined pipe coating.
Owing to be thermopositive reaction, reaction can be kept voluntarily, and adiabatic temperature is up to 3428 ℃, and steel pipe preheating temperature height, and is fast from rate of propagation.Almost react simultaneously in whole steel pipe, cause violent volumetric expansion, steel pipe is in the red heat state at once.Under the effect of swollen quick-fried power, the molten product Al of generation
2O
3Be thrown toward tube wall with Fe.Because Fe and Al
2O
3The proportion difference, in motion process, the acceleration that heavy Fe outwards moves is big, thus mainly be distributed in the coating internal layer, and the little Al of proportion
2O
3Then mainly be distributed in the top layer, contain in the transition zone
-Fe also contains a certain amount of Al simultaneously
2O
3Owing to have this gradient-structure, make the thermal expansion Harmony of coating and matrix good.
Product Al
2O
3Be in molten condition with iron, under the acting in conjunction of gravity and centrifugal force, owing to different being separated from each other of density separately.The density ratio Al of iron
2O
3Density is big, and under action of gravitation, iron flows downward, and is thrown toward sidewall simultaneously under the effect of centrifugal force, is coated on the inwall.Under action of gravitation, A l
2O
3Float over the upper strata of iron, under the effect of centrifugal force, got rid of uniformly on the iron layer that is attached to inside pipe wall.Iron and Al
2O
3Comparatively significantly produce layering, and layering is more and more obvious along with the rotating speed increase of bench drill, the thickness integral body of coating is more even.The gradient-structure that has kept the static method coating: outer for being close to pure Al
2O
3Ceramic layer, tissue morphology are column; Transition zone is Al
2O
3+
-Fe two-phase is column and is alternately distributed; The interim form of phase is Al between coating and the matrix
2O
3→ Al
2O
3+
-Fe → Fe matrix.This form makes that bonding strength is higher between coating and the matrix.
The invention has the beneficial effects as follows:
The inventive method has static self-spreading method and centrifugal from spreading the advantage that legal system is equipped with the ceramic-lined coating of steel pipe concurrently, and the ceramic coating of preparation is structure in gradient, and transition layer is thicker, the coating thermal shock resistance is good, ceramic coating density height, coating is even along Thickness Distribution, and surface quality is good.Can effectively prevent corrosion and the wearing and tearing of steel pipe inner wall.The ceramic-lined coating of steel pipe that adopts this invention to make can satisfy erosion resistant and requirement such as high temperature resistant.Can be applicable to fields such as metallurgy, mine, chemical industry and the energy.
Description of drawings
Fig. 1 is the used coating tool structure sketch of the inventive method.
Reference numeral among the figure:
Embodiment
The present invention relates to a kind of static state-centrifugal composite algorithm for preparing the ceramic-lined coating of steel pipe, its coating tool structure sketch as shown in Figure 1.Described method comprises following processing step: with steel pipe internal-surface rust cleaning, outside surface graphitization; With the steel pipe made as test specimen, sample dimensions: Φ 10 * 1.5 * 200mm.Put steel pipe is perpendicular, the rolling bearing 6 that plays the role of positioning is put in the steel pipe bottom, and swinging moment is provided by bench drill, and the test specimen bottom is blocked with the thick asbestos pad 8 of 3mm.From the interior filling aluminum heat flux powder 2 of the past pipe of the aperture on steel pipe top, and it is tight that the aluminum heat flux powder is filled.Described aluminum heat flux is by Al powder and Fe
2O
3Powder is mixed into by stoichiometric.Wherein, Al powder purity is 97%, granularity 200 orders, Fe
2O
3Powder Particle Size 70 orders, technical pure.The solder flux height reaches apart from aperture 5mm in the pipe, adds then the TiC powder as igniting agent 1, and the TiC powder is the mixture of Ti and C powder.Igniting dosage reaches concordant with aperture 11.Aperture blocks up with woven asbesto.To install the test specimen of aluminum heat flux and priming mixture, put into resistance-type heating collar 3, resistance-type heating collar 3 usefulness supports 9 are fixed on the below of bench drill, and test specimen is clipped on the bench drill by the thin steel column 12 of its top welding.The top of resistance-type heating collar and bottom are used insulation cover 10 respectively and following insulation cover 7 covers, and in order to insulation, it is lost to reduce heat, and can making in the stove everywhere when heating, temperature is consistent.Thermopair 4 inserts in the aperture of resistance-type heating collar outer setting.Give resistance-type heating collar energising preheating test specimen.After thermocouple measuring temperature reaches 750 ℃, disconnect pre-thermoelectric generator, stopped heating.Take off upper insulation cover 10 and the lower insulation cover 7 of the insulation of resistance-type heating collar top and bottom.Pull out the woven asbesto of the stifled aperture in test specimen top, light the TiC powder, open the bench drill switch simultaneously, make the test specimen rotation with lighter.In the test specimen rotation, the igniting agent of the being lighted aluminum heat flux that ignites again, make its in pipe by formula 2Al+Fe
2O
3=2Fe+ Al
2O
3Thermit reaction takes place in+836 kJ, and the thermit reaction product sticks at tube wall under gravity and centrifugal action, finishes the preparation of Ceramic lined pipe coating.
Claims (1)
1. static-centrifugal composite method for preparing the Ceramic lined pipe coating, it is characterized in that: described method comprises following processing step: steel pipe is erected put, fill up aluminum heat flux and igniting agent in the pipe, the rolling bearing that plays the role of positioning is put in the steel pipe bottom, the steel pipe bottom is blocked with asbestos pad, steel pipe top is sandwiched on the bench drill, and the steel pipe rotating torque is provided by bench drill; Adopt resistance-type heating collar preheated steel pipe, after the steel pipe preheating, light the igniting agent in the pipe, open the bench drill switch, make steel pipe rotary, in the steel pipe rotary, the igniting agent of the being lighted aluminum heat flux that ignites again, make its in pipe by formula 2Al+Fe
2O
3=2Fe+ Al
2O
3Thermit reaction takes place in+836 kJ, and the thermit reaction product sticks at tube wall under gravity and centrifugal action, finishes the preparation of Ceramic lined pipe coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100372547A CN102161595A (en) | 2011-02-14 | 2011-02-14 | Static-centrifugal composite method for preparing ceramic lining coating of steel tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100372547A CN102161595A (en) | 2011-02-14 | 2011-02-14 | Static-centrifugal composite method for preparing ceramic lining coating of steel tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102161595A true CN102161595A (en) | 2011-08-24 |
Family
ID=44463094
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100372547A Pending CN102161595A (en) | 2011-02-14 | 2011-02-14 | Static-centrifugal composite method for preparing ceramic lining coating of steel tube |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102829258A (en) * | 2012-09-11 | 2012-12-19 | 江阴东大新材料研究院 | Method for producing ceramic-lined aluminum alloy pipe |
| CN109822103A (en) * | 2019-03-01 | 2019-05-31 | 中南大学 | A kind of preparation method of high interfacial bonding strength ceramics outer lining steel pipe |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008020681A1 (en) * | 2006-08-14 | 2008-02-21 | Man-Gon Kim | Heating element and fluid heating apparatus using the same |
| CN201396557Y (en) * | 2009-01-20 | 2010-02-03 | 扬州金鑫陶瓷复合钢管有限公司 | Ceramic composite steel pipe |
| CN101898246A (en) * | 2010-07-19 | 2010-12-01 | 北京科技大学 | Method for preparing SHS ceramic liner metal tube from iron-based wastes |
-
2011
- 2011-02-14 CN CN2011100372547A patent/CN102161595A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008020681A1 (en) * | 2006-08-14 | 2008-02-21 | Man-Gon Kim | Heating element and fluid heating apparatus using the same |
| CN201396557Y (en) * | 2009-01-20 | 2010-02-03 | 扬州金鑫陶瓷复合钢管有限公司 | Ceramic composite steel pipe |
| CN101898246A (en) * | 2010-07-19 | 2010-12-01 | 北京科技大学 | Method for preparing SHS ceramic liner metal tube from iron-based wastes |
Non-Patent Citations (1)
| Title |
|---|
| 陈威等: "特种管件陶瓷内衬涂层静态自蔓延熔涂工艺", 《金属热处理》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102829258A (en) * | 2012-09-11 | 2012-12-19 | 江阴东大新材料研究院 | Method for producing ceramic-lined aluminum alloy pipe |
| CN109822103A (en) * | 2019-03-01 | 2019-05-31 | 中南大学 | A kind of preparation method of high interfacial bonding strength ceramics outer lining steel pipe |
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Application publication date: 20110824 |