CN1133902A - Method for preparing ceramic coat on surface of steel sheet - Google Patents
Method for preparing ceramic coat on surface of steel sheet Download PDFInfo
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- CN1133902A CN1133902A CN 95103970 CN95103970A CN1133902A CN 1133902 A CN1133902 A CN 1133902A CN 95103970 CN95103970 CN 95103970 CN 95103970 A CN95103970 A CN 95103970A CN 1133902 A CN1133902 A CN 1133902A
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Abstract
A process for preparing a layer of antiwear chrome carbide cermet in 2-3 mm of thickness on the surface of steel plate or planar steel workpiece features that a halogen salt and at least one metal oxide as additives are added to Al+CrO3+C material, a stratifying mode and preheating-pressurizing technology are used and aluminothermal sinter is conducted without action of centrifugal gravity.
Description
The preparation method of Synthetic Steel top coat the present invention relates to burn.
The mine, petrochemical industry needs to require in a large number anti abrasive component in the equipment of departments such as metallurgy, be characterized in higher and have hard abrasive than load, thereby work-ing life is very short.Whole high-abrasive material such as high mangaenese steel are selected in common employing or antifriction cast iron is made these component or adopt methods such as surperficial spraying wear-resistant materials such as ceramic coating to improve its life-span, but for the former, effect still can not be satisfactory under many circumstances, the latter then because sprayed coating and ground bonding strength are relatively poor, comes off easily.
For addressing these problems, announced among the CNl059376A a kind of usefulness centrifugal-thermite process prepares the method for ceramic cladding layer.Choose and consist of Al+Fe
2O
3(or Fe
3O
4) material and additive SiO
2Deng, the material that mixes is put into steel pipe, with the oxy-acetylene sparking mode, reactant is lighted the initiation thermopositive reaction at steel pipe one end, rely on heat release that its reaction is kept and voluntarily with resultant of reaction iron and the instantaneous fusion of aluminum oxide.Under centrifugal action, the aluminum oxide of light specific gravity is distributed in the inwall of steel pipe, and heavy iron is distributed between steel pipe and the alumina-ceramic and with ceramic layer and steel pipe and combines, and forms thickness and is about 2 millimeters corrosion-proof wear cladding layer.In addition, J63089680, J63089675, patents such as J62086172 be reported in principle, aspect such as batching is mixed, sparking mode and CNl059376 be unprincipled differences also.Main difference is not adopt SiO in the batching
2Deng additive.
As can be seen, the characteristics that centrifugal-thermite process prepares ceramic cladding layer are to utilize the chemical energy of reactant to produce the required heat of cladding process, and utilize centrifugal force to make the resultant of reaction liquid phase separation of molten state.Because high melt temperature (about 2400K) can form the intensive metallurgical binding between ground and the cladding layer, thereby obtain incrust cladding layer.Yet we notice that also the application of centrifugal thermite process is only limited to the cladding processing of tubular workpiece or rotator inwall, and cladding material also only is Al simultaneously
2O
3Deng oxide ceramics.
The objective of the invention is to continuing to keep aluminothermic-centrifugalization technology simple, anchoring strength of coating is high and be suitable for preparing under the prerequisite than advantages such as thick coatings and manage to remove the restriction of centrifugal force to the cladding workpiece, simultaneously with wear-resisting, the good chromium carbide sintering metal of anti-corrosion and antioxidant property is as cladding material, thereby is implemented in the processing treatment that the ceramic layer cladding is carried out on steel plate or flat work pieces surface.
Basic design of the present invention is: the melt temperature when adopting following measure further to improve thermite reaction, so that hold-time and the flowability of melt under liquid state be increased, thereby be implemented in the liquid phase separation of reaction product under the no centrifugal gravity effect: adopt the very high chromic anhydride of heat enthalpy value as oxygenant; Add halogen perfect combustion catalyzer and metal oxide slag-making addition; Reaction mass is carried out thermal pretreatment and gas pressurization.Take following measure to overcome the wetting obstacle of chromium carbide: all measurements of above-mentioned raising melt temperature on the steel surface; Adopt stacked proportion scheme layer-built cables installation to have the reaction mass of ladder composition proportion.
Description of contents of the present invention is as follows:
1. the main body of reactant batching is by the oxygenant chromium trioxide, and reductive agent metallic aluminium powder and carbon dust are formed.Additive is made up of a kind of metal halide and at least a metal oxide.The former can react with the oxide film on reductive agent aluminium powder surface, produces fresh aluminium powder surface with the starting temperature that reduces thermite reaction and increase speed of reaction; The latter then can with byproduct of reaction Al
2O
3Effect forms the low melting point composite oxides, thereby reduces the relative viscosity of slag, helps quickening liquid phase separation and improves cladding layer smooth surface degree.
2. the halogen perfect combustion catalyzer preferentially adopts AlF
3, MgF
2, CaF
2, BaF
2, NaF and NaAlF
6Slag-making addition then preferentially adopts CaO, MgO, SiO
2, BaO, TiO
2And ZnO.
3. the gross weight of additive is the 5-15% of batching gross weight, and wherein ignition dope is 1-8%, and slag former is 5-12%.
4. the reaction mass after mixing adopts stacked proportion scheme layer-built cables installation at surface of steel plate to be coated with: at the bottom of close surface of steel plate, the composition that consists of the sosoloid (carbon content is not more than 0.01%) that can produce pure chromium or chromium of batching is to form wetting functional layer; Carbon content should increase gradually in more than this layer each layer batching, and finally forms required surface composition, i.e. Cr
7C
3/ Cr.Stepped construction should be 2 grades at least, preferentially is chosen as the 3-4 level.
5. reaction mass is preheated to 100-300 ℃, be 20-40 minute warm up time, charges into inertia or neutral gas such as high pure nitrogen then in reaction chamber, and boost to 5-15MPa.The sparking mode of material can be selected a kind of of subordinate's method: 1. tungsten filament coil igniting (Fig. 1); 2. the hot furnace wall igniting of detonator (Fig. 2).The angle of the metallization processes that conforms to the principle of simplicity is preferentially selected the latter, promptly lays the chemical constitution thing with low temperature ignition capability on the batching surface, and its ignition temperature Tig is 300-400 ℃.Preheating finishes, and continue to heat up, and when temperature during greater than Tig, causes thermite reaction.After reaction finishes, continue to keep furnace pressure and furnace cooling, 20 minutes rears are desirable to go out workpiece.
The steel plate pottery cladding layer of the present invention's preparation has the favorable mechanical performance, and its hardness is HV9.0-11.5GPa; Intensity is 180-260MPa; Through 950 ℃ of soaking, the 10%NaCl aqueous solution is chill test repeatedly, and the antistripping number of times is greater than 40; It is 5-10% that drainage records the cladding layer porosity.
The invention will be further described below in conjunction with accompanying drawing.
Fig. 1 is for adopting the schematic diagram of tungsten filament coil sparking mode, [1] nichrome wire among the figure, [2] reaction vessel, [3] reaction batching, [4] workpiece, [5] tungsten filament coil, [6] power supply.
Fig. 2 is for adopting the schematic diagram of the hot furnace wall of detonator sparking mode, and the tungsten filament coil [5] and power supply [6] in using detonator briquetting [5] alternate figures 1, all the other are indifference also.
In order to understand the present invention better, list some specific embodiments below.
Embodiment 1.
The batching of the composition of reactant table 1 embodiment 1 as shown in table 1 is formed (unit gram)
Wherein aluminium powder is 100 orders, and carbon dust is greater than 500 orders; Detonator consists of MnO
2(18.7g)+KClO
3(9.3g)+S (3.8g)+Al (5.6g); Through ball milling, the layer-built cables installation of will preparing burden after the drying is the 20# of φ 95 * 15mm surface of steel plate (using 100# liquid honing scale removal in advance); The detonator briquetting is placed at the center of top layer batching, and (φ 30 * 5mm); Workpiece is put into the interior pre-heating temperature elevation to 150 of homemade reaction unit (withstand voltage greater than 20MPa, Heating temperature is less than 400 ℃) ℃, soaking 20 minutes together with batching and detonator; Charge into high pure nitrogen and make pressure reach 7.5MPa; Continue to heat up, in the time of about 250 ℃, detonator causes thermite reaction; Keep furnace pressure, take out workpiece after 20 minutes, water-cooled is peeled off topped molten slag layer on the surface, obtains the fine and close smooth ceramic coating that thickness is about 2.5mm.Recording hardness is 9.3-9.6GPa, and intensity is 210MPa, and circulation Quench number of times is greater than 40 times, porosity 5-8%.
| ????CrO 3 | ????Al | ????C | ???AlF 3 | ????CaO | |
| Bottom middle level top layer | ????13.0 ????26.0 ????38.0 | ????7.0 ????14.0 ????20.0 | ????0.0 ????0.6 ????2.0 | ????0.6 ????1.2 ????1.8 | ????2.0 ????4.0 ????6.0 |
Embodiment 2
Reactant is formed the batching of table 2 embodiment 2 as shown in table 2 and is formed (unit gram)
| ??CrO 3 | ???Al | ????C | ???NaAlF 6 | ???TiO 2 | ????SiO 2 | |
| Top layer, the middle-level top layer of bottom | ??10.4 ??20.5 ??30.1 ??40.0 | ??5.6 ??11.1 ??16.4 ??21.8 | ????0.0 ????0.5 ????1.4 ????2.8 | ????0.3 ????0.6 ????1.0 ????1.3 | ????0.8 ????1.6 ????2.4 ????3.2 | ????1.3 ????2.6 ????3.8 ????5.1 |
Select size with embodiment 1 but material is the steel plate of 40Cr; Preheating temperature is 250 ℃, soaking 20 minutes; Nitrogen pressure 5.0MPa; The igniting of employing tungsten filament coil, 25 volts of voltages, electric current 50 peaces; Make the cladding layer that thickness is about 3mm.Recording hardness is 10.2-10.5GPa, and intensity 240MPa, circulation Quench number of times be greater than 40 times, porosity 6-9%.
Claims (6)
1. the preparation method of the wear-resisting cladding layer of surface of steel plate is characterized in that by Al+CrO
3The slag-making addition that main body batching that+C forms and the perfect combustion catalyzer of being made up of a kind of halogen compound and at least a metal oxide are formed; Adopt stacked batching mode and preheating pressing technology, under no centrifugal gravity effect, finish the thermite reaction sintering, thereby form the thick chromium carbide ceramic cladding layer-metal of 2-3mm at steel plate or plane steel workpiece surface.
2. preparation method according to claim 1 is characterized in that perfect combustion catalyzer is at AlF
3, MgF
2, CaF
2, BaF
2, NaF and NaAlF
6In select, slag-making addition is at CaO, MgO, SiO
2, BaO, TiO
2With select among the ZnO.
3. according to claim 1 and 2 described preparation methods, it is characterized in that the additive total amount accounts for the 5-15 of batching total amount (wt%, down together), wherein perfect combustion catalyzer is 1-8%, and slag-making addition is 5-12%.
4. preparation method according to claim 1, the employing overlapped way of laying that it is characterized in that reaction mass is carried out, the wherein the most close bottom of waiting to be coated with workpiece is wetting functional layer, its composition should guarantee to form the sosoloid of pure chromium or chromium, carbon content is the ladder growth in each batching layer after this, consists of Cr7C until reaching the top layer
3The composition of/Cr, stacked number should be 2 at least.
5. preparation method according to claim 1 is characterized in that it is 3-4 that laying of reaction mass adopted stacked number.
6. preparation method according to claim 1, it is characterized in that preheating temperature be in 100-300 ℃ and the preparation process with inertia or neutral gas pressurization, moulding pressure is 5-15MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95103970 CN1133902A (en) | 1995-04-21 | 1995-04-21 | Method for preparing ceramic coat on surface of steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95103970 CN1133902A (en) | 1995-04-21 | 1995-04-21 | Method for preparing ceramic coat on surface of steel sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1133902A true CN1133902A (en) | 1996-10-23 |
Family
ID=5074949
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95103970 Pending CN1133902A (en) | 1995-04-21 | 1995-04-21 | Method for preparing ceramic coat on surface of steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1133902A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101239382B (en) * | 2008-03-12 | 2010-06-02 | 成都利君科技有限责任公司 | Abrasion-proof composite roller, board and manufacturing method thereof |
| CN102151937A (en) * | 2010-12-15 | 2011-08-17 | 清华大学 | Self-propagation high-temperature synthesis method for in-situ synthesis of metal base composite material overlaying layer |
| CN102534455A (en) * | 2011-12-28 | 2012-07-04 | 中国科学院宁波材料技术与工程研究所 | Composite gradient coating thermally sprayed on surface of screw rod of injecting and molding machine and a method for preparing same |
| CN108642490A (en) * | 2018-05-30 | 2018-10-12 | 安徽工程大学 | A kind of SHS metallurgical powders and its application method for 15CrMoQ pipe die reparations |
| CN108642489A (en) * | 2018-05-30 | 2018-10-12 | 安徽工程大学 | A kind of the SHS metallurgical powder and its application method multiple for 21CrMo10 steel pipe die repairs |
| CN108746638A (en) * | 2018-05-30 | 2018-11-06 | 安徽工程大学 | A kind of the SHS metallurgical powder and its application method multiple for 30CrMo steel pipe die repairs |
| CN108746639A (en) * | 2018-05-30 | 2018-11-06 | 安徽工程大学 | A kind of the SHS metallurgical powder and its application method multiple for H13 steel pipe die repairs |
-
1995
- 1995-04-21 CN CN 95103970 patent/CN1133902A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101239382B (en) * | 2008-03-12 | 2010-06-02 | 成都利君科技有限责任公司 | Abrasion-proof composite roller, board and manufacturing method thereof |
| CN102151937A (en) * | 2010-12-15 | 2011-08-17 | 清华大学 | Self-propagation high-temperature synthesis method for in-situ synthesis of metal base composite material overlaying layer |
| CN102151937B (en) * | 2010-12-15 | 2013-10-16 | 清华大学 | Self-propagation high-temperature synthesis method for in-situ synthesis of metal base composite material overlaying layer |
| CN102534455A (en) * | 2011-12-28 | 2012-07-04 | 中国科学院宁波材料技术与工程研究所 | Composite gradient coating thermally sprayed on surface of screw rod of injecting and molding machine and a method for preparing same |
| CN102534455B (en) * | 2011-12-28 | 2014-10-22 | 中国科学院宁波材料技术与工程研究所 | Composite gradient coating thermally sprayed on surface of screw rod of injecting and molding machine and a method for preparing same |
| CN108642490A (en) * | 2018-05-30 | 2018-10-12 | 安徽工程大学 | A kind of SHS metallurgical powders and its application method for 15CrMoQ pipe die reparations |
| CN108642489A (en) * | 2018-05-30 | 2018-10-12 | 安徽工程大学 | A kind of the SHS metallurgical powder and its application method multiple for 21CrMo10 steel pipe die repairs |
| CN108746638A (en) * | 2018-05-30 | 2018-11-06 | 安徽工程大学 | A kind of the SHS metallurgical powder and its application method multiple for 30CrMo steel pipe die repairs |
| CN108746639A (en) * | 2018-05-30 | 2018-11-06 | 安徽工程大学 | A kind of the SHS metallurgical powder and its application method multiple for H13 steel pipe die repairs |
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| SE01 | Entry into force of request for substantive examination | ||
| CI01 | Correction of invention patent gazette |
Correction item: Denomination of Invention Correct: Method for preparing ceramic coating on steel plate surface False: Method for preparing ceramic coating on steel plate surface Number: 43 Page: 80 Volume: 12 |
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| ERR | Gazette correction |
Free format text: CORRECT: INVENTION NAME; FROM: PREPARATION METHODS OF CERAMIC SURFACE FOR STEEL PLATE COVERAGE TO: PREPARATION METHODS OF CERAMIC SURFACE FOR STEEL PLATE MELTING COVERAGE |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |