CN104725079A - Method for forming smooth and compact layer on surface of carbon-containing refractory material - Google Patents
Method for forming smooth and compact layer on surface of carbon-containing refractory material Download PDFInfo
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- CN104725079A CN104725079A CN201510109724.4A CN201510109724A CN104725079A CN 104725079 A CN104725079 A CN 104725079A CN 201510109724 A CN201510109724 A CN 201510109724A CN 104725079 A CN104725079 A CN 104725079A
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- Prior art keywords
- carbon
- containing refractory
- refractory material
- refractory
- carbon containing
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000011819 refractory material Substances 0.000 title claims abstract description 17
- 229910052751 metal Inorganic materials 0.000 claims abstract description 23
- 239000002184 metal Substances 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 13
- RQMIWLMVTCKXAQ-UHFFFAOYSA-N [AlH3].[C] Chemical compound [AlH3].[C] RQMIWLMVTCKXAQ-UHFFFAOYSA-N 0.000 claims description 7
- 230000005684 electric field Effects 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000004381 surface treatment Methods 0.000 abstract description 3
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 abstract 1
- 150000002739 metals Chemical class 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 6
- 230000003078 antioxidant effect Effects 0.000 description 5
- 230000003245 working effect Effects 0.000 description 5
- 239000000395 magnesium oxide Substances 0.000 description 4
- 238000000137 annealing Methods 0.000 description 3
- 239000003963 antioxidant agent Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- RWDBMHZWXLUGIB-UHFFFAOYSA-N [C].[Mg] Chemical compound [C].[Mg] RWDBMHZWXLUGIB-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Abstract
The invention discloses a method for forming a smooth and compact layer on the surface of a carbon-containing refractory material, and belongs to a surface treatment technology for refractory materials. The method comprises the following step of by taking the carbon-containing refractory material in direct contact with metal liquid as a negative pole and taking an alumina-carbon based refractory material rod inserted in the metal liquid as a positive pole, applying a low-density pulse current with a pulse current density of 0.000001-10.0 A.cm<-2> and a pulse frequency of 100-6000 Hz, so that the smooth and compact layer is formed on the surface, in direct contact with the metal liquid, of the carbon-containing refractory material. The method disclosed by the invention has the characteristics that the method is simple and easy to operate, and does not pollute molten metals.
Description
Technical field
The present invention relates to refractory surface treatment technology, be specifically related to a kind of method forming smooth tight zone on carbon containing refractory surface.
Background technology
Carbon containing refractory has excellent resistance to fouling, resistance to heat shocks and high-temperature stability in high temperature environments, is therefore widely applied in metallurgical industry.As in steel smelting procedure, the component such as the steel ladle working layer used, stopper, long nozzle, submerged nozzle have the material of more than 90% to form by carbon containing refractory, in nonferrous smelting field, carbon containing refractory is many to be used by the working lining as zinc, aluminium.
But because the main raw material in carbon containing refractory is graphite or carbon black, this kind of raw material is easy to oxidized thus causes damage to component in 500-800 DEG C of hot environment.Therefore; in order to improve the oxidation-resistance of carbon containing refractory; the method of general employing adds antioxidant in the process of preparation related components; at the protective oxide film that refractory material matrix and surface formation one deck are made up of antioxidant, make antioxidant oxidation before graphite or carbon black oxidation.A kind of method preventing carbon containing refractory to be oxidized in addition is at fire-proof material member surface-coated one deck inoxidzable coating, and the anti-oxidation material of muddy or molten state is covered refractory surface by the main method of spraying or dipping that adopts at present.The enforcement of these methods improves the oxidation-resistance of carbon containing refractory, effectively extends its work-ing life, and the antioxidant property of carbon containing refractory substantially can be made to reach re-set target.
But, the working lining of the carbon containing refractory directly contacted with metal melts such as molten steel, due to erosion action such as the washing away of molten metal, dissolvings, the zone of oxidation formed at refractory surface is in advance etched and reduces the antioxidant property of refractory materials, thus reduces the work-ing life of refractory materials.
Therefore, when carbon containing refractory contacts with molten metal as container, if the non-metallic inclusion in metal can be made to migrate to refractory surface form dense protective layer, significant for the oxidation-resistance and erosion resistance improving refractory materials.
Summary of the invention
The pulsed current annealing method that the present invention's employing applies under low current density in the molten metal makes the oxide inclusion in molten metal migrate to carbon containing refractory working lining, smooth tight zone is formed on its surface, thus not only reduce oxide inclusion in molten steel, improve molten steel purity, and cover the smooth tight zone of carbon containing refractory surface formation, and then effectively can improve oxidation-resistance and the resistance to fouling of carbon containing refractory working lining.
A kind of with the surface that metal liquid directly contacts, the method for conservation treatment is carried out to carbon containing refractory; the method comprises: the mode utilizing extra electric field; namely with the carbon containing refractory working lining directly contacted with metal liquid for negative pole; excellent for positive pole with the aluminum-carbon refractory material be inserted in metal liquid; apply the electric field with certain pulse current density and pulse-repetition, enable its surface generate smooth tight zone.
According to exemplary embodiment of the present invention, described pulse current density is: 0.000001-10.0Acm
-2, pulse-repetition is: 100-6000Hz.
The invention has the advantages that:
(1) the pulsed current annealing method applied under low current density is in the molten metal adopted to carry out the surface treatment of carbon containing refractory, oxide inclusion in metal liquid effectively driven and has been fixed on carbon containing refractory surface, effectively improve the work-ing life of carbon containing refractory.
(2) under the effect of electric field, after the oxide inclusion in metal liquid is fixed on carbon oxide surface, effectively improve the purity of metal liquid (as molten steel), and then improve the quality of metal products.
(3) equipment involved in the present invention is extremely simple, easily implements and with low cost, has significant economic benefit.
Embodiment
The present invention adopts the method for pulsed current annealing to make refractory oxide in molten metal (as aluminum oxide, magnesium oxide etc.), migrates to carbon containing refractory surface and forms smooth tight zone, reaching desirable object.Mechanism of the present invention is utilize refractory oxide to be mingled with from molten liquid steel resistivity different, and under the effect of low current density pulsed current, oxide inclusion is pushed to refractory surface and uniform deposition forms smooth dense protective layer.
Embodiment 1
First the present invention implements on 60t ladle.Leave standstill in process at ladle, with the magnesia carbon refractory working lining of steel ladle for negative pole, excellent for positive pole with the aluminum-carbon refractory material be inserted into from ladle upper center in molten steel, applying pulse current density is 0.01Acm
-2, pulse-repetition is the low density pulsed current of 2000Hz, and average voltage is 0.2V.After the life cycle of ladle terminates, be the smooth tight zone of 2-3mm being formed with aluminum oxide (>90%) thickness that is main component with the surface that molten steel directly contacts of the magnesia carbon refractory as negative pole, make extend 20% the work-ing life of the magnesium carbon refractory brick of steel ladle working layer, mean life extends to 36 times from 30 times.
Embodiment 2
The present invention is applied on the aluminum-carbon refractory material submerged nozzle below 20t tundish, with the aluminum-carbon refractory material of mouth of a river outside surface for negative pole, excellent as positive pole using the aluminum-carbon refractory material be inserted in the molten steel of center, the mouth of a river, applying pulse current density is 0.1Acm
-2, pulse-repetition is the low density pulsed current of 4000Hz, after using continuously, the internal surface of aluminum-carbon refractory material define alumina content more than 90%, thickness is the smooth tight zone of 4-8mm, makes extend 35% the work-ing life of submerged nozzle.Mean life extends to 7.83 stoves from 5.80 heats.
Present invention employs low current density positive negative impulse current; strength of current is low; inducedmagnetic field or the heat imbalance of formation are minimum; be deposited thereon after moving to carbon containing refractory surface under the effect of the refractory oxide (as aluminum oxide, magnesium oxide etc.) in molten metal bath at electric field; form fine and close protective layer, and can not continue again new migration occurs.
Claims (2)
1. one kind forms the method for smooth tight zone on carbon containing refractory surface, it is characterized in that described method comprises: with the carbon containing refractory directly contacted with metal liquid for negative pole, excellent for positive pole with the aluminum-carbon refractory material be inserted in metal liquid, apply to have the electric field of predetermined pulse current density and predetermined pulse frequency, thus form smooth tight zone at carbon containing refractory with the surface that metal liquid directly contacts.
2. method according to claim 1, is characterized in that described predetermined pulse current density is 0.000001-10.0Acm
-2, described predetermined pulse frequency is 100-6000Hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510109724.4A CN104725079B (en) | 2015-03-12 | 2015-03-12 | A kind of method for forming smooth compacted zone on carbon containing refractory surface |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510109724.4A CN104725079B (en) | 2015-03-12 | 2015-03-12 | A kind of method for forming smooth compacted zone on carbon containing refractory surface |
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| Publication Number | Publication Date |
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| CN104725079A true CN104725079A (en) | 2015-06-24 |
| CN104725079B CN104725079B (en) | 2017-06-20 |
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|---|---|---|---|
| CN201510109724.4A Expired - Fee Related CN104725079B (en) | 2015-03-12 | 2015-03-12 | A kind of method for forming smooth compacted zone on carbon containing refractory surface |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105646003A (en) * | 2015-12-30 | 2016-06-08 | 苏州大学 | Slag-corrosion-resisting refractory material and in-situ forming method of slag-corrosion-resisting coating on surface of slag-corrosion-resisting refractory material |
| CN105779692A (en) * | 2016-03-11 | 2016-07-20 | 东北大学 | Method for controlling size and number of inclusions in molten metal |
| CN106380229A (en) * | 2016-08-27 | 2017-02-08 | 武汉科技大学 | Method and device for improving slag corrosion resistance of magnesia carbon refractory material |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0417435A2 (en) * | 1989-09-15 | 1991-03-20 | Didier-Werke Ag | Refractory carbonaceous body |
| JP2002284588A (en) * | 2001-03-28 | 2002-10-03 | Ngk Insulators Ltd | CARBON FIBER REINFORCED SiC COMPOSITE MATERIAL HAVING OXIDATION RESISTANCE AND ITS MANUFACTURING METHOD |
| CN1818145A (en) * | 2006-01-12 | 2006-08-16 | 上海大学 | Production of nanometer crystal zinc plating |
| CN103436655A (en) * | 2013-05-23 | 2013-12-11 | 沈阳东大高温材料有限公司 | Method for removing and refining inclusion and bubble from molten metal |
-
2015
- 2015-03-12 CN CN201510109724.4A patent/CN104725079B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0417435A2 (en) * | 1989-09-15 | 1991-03-20 | Didier-Werke Ag | Refractory carbonaceous body |
| EP0417435A3 (en) * | 1989-09-15 | 1991-04-17 | Didier-Werke Ag | Refractory carbonaceous body |
| JP2002284588A (en) * | 2001-03-28 | 2002-10-03 | Ngk Insulators Ltd | CARBON FIBER REINFORCED SiC COMPOSITE MATERIAL HAVING OXIDATION RESISTANCE AND ITS MANUFACTURING METHOD |
| CN1818145A (en) * | 2006-01-12 | 2006-08-16 | 上海大学 | Production of nanometer crystal zinc plating |
| CN103436655A (en) * | 2013-05-23 | 2013-12-11 | 沈阳东大高温材料有限公司 | Method for removing and refining inclusion and bubble from molten metal |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105646003A (en) * | 2015-12-30 | 2016-06-08 | 苏州大学 | Slag-corrosion-resisting refractory material and in-situ forming method of slag-corrosion-resisting coating on surface of slag-corrosion-resisting refractory material |
| CN105646003B (en) * | 2015-12-30 | 2018-06-19 | 苏州大学 | Anti-slag invades refractory material and its surface in situ forms the method that anti-slag invades coating |
| CN105779692A (en) * | 2016-03-11 | 2016-07-20 | 东北大学 | Method for controlling size and number of inclusions in molten metal |
| CN106380229A (en) * | 2016-08-27 | 2017-02-08 | 武汉科技大学 | Method and device for improving slag corrosion resistance of magnesia carbon refractory material |
| CN106380229B (en) * | 2016-08-27 | 2017-11-28 | 武汉科技大学 | A kind of method and device for improving magnesia carbon refractory resistance to slag corrosion |
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| CN104725079B (en) | 2017-06-20 |
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