CN102978616B - Self-propagating high-temperature synthesis (SHS) process for preparing thick aluminium oxide ceramic coatings on steel plate surfaces - Google Patents
Self-propagating high-temperature synthesis (SHS) process for preparing thick aluminium oxide ceramic coatings on steel plate surfaces Download PDFInfo
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- CN102978616B CN102978616B CN201210581017.1A CN201210581017A CN102978616B CN 102978616 B CN102978616 B CN 102978616B CN 201210581017 A CN201210581017 A CN 201210581017A CN 102978616 B CN102978616 B CN 102978616B
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Abstract
The invention relates to a self-propagating high-temperature synthesis (SHS) process for preparing thick aluminium oxide ceramic coatings on steel plate surfaces. The process comprises the following steps of: derusting and degreasing the steel plate surfaces and blasting sand to roughen the steel plate surfaces; spraying nickel coated aluminium powder on the steel plate surfaces roughened by blasting sand through using a flame powder gun for bottoming; and oppositely putting the rough surfaces, undergoing sand blasting and bottoming, of a plurality of steel plates 2 undergoing bottoming treatment in the step 2, inwards at intervals, preparing semi-closed reaction space with refractory materials 6, reserving a flow-limiting hole 8 at the lower end of the reaction space with refractory bricks 1 to prepare a reaction device, putting the whole reaction device on a rotary table 7 with a rotating shaft 5 in the center, filling aluminium welding agents 3 between the steel plates 2 and the refractory materials 6, enabling the aluminium welding agents to carry out self-propagating reaction according to the formula Fe2O3+2Al=2Fe+Al2O3 after the aluminium welding agents are ignited, simultaneously driving the rotary table to rotate to enable the reaction products iron and aluminium oxide ceramics to rush at the steel plate surfaces on the rotary table in sequence under the action of centrifugal force and obtaining the thick aluminium oxide ceramic coatings on the steel plates after slow cooling. The method has the advantages of energy conservation and high production efficiency.
Description
Technical field
The invention provides the centrifugal self-propagating method that a kind of surface of steel plate prepares thick alumina ceramic coating.Belong to field of surface engineering technique.
Background technology
In the industrial production, workpiece usually will be on active service in the severe environment such as high temperature, high pressure, burn into wearing and tearing.General steel plate has been difficult to meet this requirement.At present, hot-spraying techniques is generally adopted to prepare coating modified at surface of steel plate both at home and abroad, but the cohesive strength of spray-on coating and all lower with the bonding strength of matrix, when coating is different from body material kind, thermal expansivity difference is very large, produce thermal stresses when temperature fusion, affect the bonding strength of coating and matrix.Coat-thickness not (being difficult to reach grade) simultaneously, in the urgent need to the effective thick ceramic coating preparation method of one.Centrifugal self-propagating method, is also called the centrifugal thermite process of SHS.This technology is the application that succeeds in manufacture ceramic-lined steel pipe field at present.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency, provide a kind of surface of steel plate to prepare the centrifugal self-propagating method of thick alumina ceramic coating.
The object of the present invention is achieved like this: a kind of surface of steel plate prepares the centrifugal self-propagating method of thick alumina ceramic coating, comprises following processing step:
Step one, surface of steel plate pre-treatment
Surface of steel plate eliminates rust, deoils and blasted rough;
Step 2, prime coat process
Sprayed the uneven surface spraying Al contained Ni prime coat of sand at steel plate with flame powder spray gun;
Step 3, prepare thick aluminum oxide coating layer and realize densification
By steel plate 2 polylith through the process of step 2 prime coat, sandblasting the uneven surface of prime coat are inwardly at a certain distance to putting, a semi-enclosed reaction compartment is made with refractory materials 6, metering hole 8 reserved by this reaction compartment lower end refractory brick 1, make reaction unit, whole reaction unit being positioned over central authorities has on the turntable 7 of rotating shaft 5, fills aluminum heat flux 3, by Fe after lighting between steel plate 2 and refractory materials 6
2o
3+ 2Al=2Fe+Al
2o
3formula generation self-propagating reaction, meanwhile, drive turntable to rotate, make reaction product iron and alumina-ceramic under centrifugal action, rush at surface of steel plate on turntable successively, on steel plate, obtain thick aluminum oxide coating layer after slow cooling, this aluminum oxide coating layer thickness is at 2mm ~ 3mm.
Beneficial effect of the present invention
1, efficient energy-saving
SHS sufficient reacting utilizes the liberated heat of thermite reaction own, and in reaction, temperature reaches as high as 4000 DEG C, not need from the external world supplemental heat source again, and speed of response is very fast, is generally 0.1 ~ 20cm/s.
2, quality is high
High temperature can evaporate volatile impurity, and thus product is normally highly purified.SHS process sustainable for some time, there is sufficient heat energy to facilitate coating and matrix to form metallurgical binding more completely, thus improve coating and the bonding strength of matrix and the cohesive strength of coating.
3, centrifugal for self-propagating hot-pressing technique is combined with hot-spraying techniques, improve clean level and the activity at interface between coating and matrix.Carrying out centrifugal pressurization to the metal-ceramic coating being still in the condition of high temperature, coating is better combined with base material, is then that cohesive strength or the interface bond strength of coating all will significantly improve.The user demand under serious abrasive environment can be met.Centrifuging pressurization also can remain useful stress in the coating, alleviates and avoid the cracking of coating.
In sum, this method make use of thermite reaction, save energy, and once efficiently can prepare six to eight pieces of even more polylith coated steel sheets, production efficiency is high.Centrifugal rotation pressurization densification, can obtain high quality aluminum oxide ceramic thick coating.The several functions such as coated steel sheet has corrosion-resistant, shock-resistant (anti-bullet), wear-resisting, hot strength is high, thermal shock resistance is good, vibration and noise reducing, can be widely used in the piece surface modification that service condition is severe, fan blade, flow deflector, wearing plate.
Accompanying drawing explanation
Fig. 1 is the reaction unit vertical view that the present invention reacts used.
Fig. 2 is the reaction unit side direction cut-away view that the present invention reacts used.
Reference numeral in figure:
Refractory brick 1, steel plate 2, aluminum heat flux 3, fire-resistant packing material 4, rotating shaft 5, refractory materials 6, turntable 7, metering hole 8, key 9, bearing 10, the Direction of Reaction 11, sense of rotation 12.
Most preferred embodiment:
The present invention relates to the centrifugal self-propagating method that a kind of surface of steel plate prepares thick alumina ceramic coating, described method comprises following processing step:
Step one, surface of steel plate pre-treatment
Get the checkered plate of length × wide × thick=640mm × 980mm × thick 8mm specification, surface derusting, to deoil and blasted rough;
Step 2, prime coat process
With flame powder spray gun at steel plate sandblasting uneven surface spraying Al contained Ni prime coat;
Step 3, prepare thick aluminum oxide coating layer and realize densification
As shown in Figure 1, 2, the steel plate 2(of economy-combat bottom layer treatment is preferably adopted checkered plate) six to eight pieces, the uneven surface of sandblasting bottoming is inwardly at a certain distance to putting, a semi-enclosed reaction compartment (two to three metering holes 8 reserved by lower end refractory brick 1) is made with refractory materialss 6 such as refractory brick and joint sealing mud, make reaction unit, whole reaction unit is positioned over central authorities to be had on the turntable 7 of rotating shaft 5.Aluminum heat flux 3 is filled, by Fe after lighting between steel plate 2 and refractory materials 6
2o
3+ 2Al=2Fe+Al
2o
3formula generation self-propagating reaction, simultaneously, turntable is driven to rotate with motor, make reaction product iron and alumina-ceramic under centrifugal action, rush at surface of steel plate on turntable successively, on steel plate, obtain the thick aluminum oxide coating layer that density is high, bonding strength is good after slow cooling, this aluminum oxide coating layer thickness is at 2mm ~ 3mm.
Range of application:
The standby alumina ceramic coating of this legal system is thicker, wear-resisting, corrosion-resistant, resistance to elevated temperatures good, is applicable to the parts worked under bad working environments condition, as fan blade, flow deflector, wearing plate etc.There is corrosion-resistant, shock-resistant (anti-bullet) simultaneously, wear-resisting, hot strength is high, thermal shock resistance is good, the several functions such as vibration and noise reducing, wearing and tearing and corrosion resistant machinery part surface modification can be widely used in.
Claims (1)
1. surface of steel plate prepares a centrifugal self-propagating method for thick alumina ceramic coating, it is characterized in that: described centrifugal self-propagating method comprises following processing step:
Step one, surface of steel plate pre-treatment
Surface of steel plate eliminates rust, deoils and blasted rough;
Step 2, prime coat process
With flame powder spray gun at steel plate sandblasting uneven surface spraying Al contained Ni prime coat;
Step 3, prepare thick aluminum oxide coating layer and realize densification
By steel plate (2) polylith through the process of step 2 prime coat, the uneven surface of sandblasting bottoming is inwardly at a certain distance to putting, a semi-enclosed reaction compartment is made with refractory materials (6), this reaction compartment lower end reserved metering hole (8) of refractory brick (1), make reaction unit, whole reaction unit being positioned over central authorities has on the turntable (7) of rotating shaft (5), fills aluminum heat flux (3), by Fe after lighting between steel plate (2) and refractory materials (6)
2o
3+ 2Al=2Fe+Al
2o
3formula generation self-propagating reaction, meanwhile, drive turntable to rotate, make reaction product iron and alumina-ceramic under centrifugal action, rush at surface of steel plate on turntable successively, on steel plate, obtain thick aluminum oxide coating layer after slow cooling, this aluminum oxide coating layer thickness is at 2mm ~ 3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210581017.1A CN102978616B (en) | 2012-12-28 | 2012-12-28 | Self-propagating high-temperature synthesis (SHS) process for preparing thick aluminium oxide ceramic coatings on steel plate surfaces |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210581017.1A CN102978616B (en) | 2012-12-28 | 2012-12-28 | Self-propagating high-temperature synthesis (SHS) process for preparing thick aluminium oxide ceramic coatings on steel plate surfaces |
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| CN102978616A CN102978616A (en) | 2013-03-20 |
| CN102978616B true CN102978616B (en) | 2015-02-18 |
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| CN104141126A (en) * | 2013-05-08 | 2014-11-12 | 陈威 | Static self-propagating reactive hot pressing method for forming a ceramic coating on a steel plate surface |
| CN104141125A (en) * | 2013-05-08 | 2014-11-12 | 陈威 | Static self-propagating reaction hot-pressing method for manufacturing sandwich ceramic interlayer clad steel plate |
| CN103469200B (en) * | 2013-09-26 | 2015-11-04 | 重庆市科学技术研究院 | A kind of method preparing nanocoating |
| CN103556099A (en) * | 2013-11-05 | 2014-02-05 | 刘保国 | Processing method of rolling bearing surface electric-insulation layer |
| CN105463358B (en) * | 2015-12-01 | 2018-09-14 | 南通大学 | A method of preparing wear-resistant coating on the steel plate |
| FI129386B (en) * | 2016-02-12 | 2022-01-31 | Wd Racing Oy | Vulcanisation apparatus for vehicle tyres |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1029352C (en) * | 1990-09-01 | 1995-07-19 | 北京科技大学 | Manufacturing technique of corrosion-proof wear-ressistant ceramic-lined steel pipe |
| US6136452A (en) * | 1998-02-27 | 2000-10-24 | The Regents Of The University Of California | Centrifugal synthesis and processing of functionally graded materials |
| JP4184140B2 (en) * | 2002-05-10 | 2008-11-19 | キヤノン化成株式会社 | Centrifugal mold, method for producing the same, centrifugal molded body and blade produced using the same, and method for producing the same |
| CN101704090B (en) * | 2009-09-18 | 2011-09-14 | 江阴东大新材料研究院 | Method for preparing ceramic coating on surface of steel plate by electromagnetic stirring aided with thermit reaction hot-pressing |
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