CN102898163B - Low-carbon aluminum-carbon unburned sliding plate brick containing nano silicon oxide and preparation method - Google Patents
Low-carbon aluminum-carbon unburned sliding plate brick containing nano silicon oxide and preparation method Download PDFInfo
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Abstract
The invention discloses a low-carbon aluminum-carbon unburned sliding plate brick containing a nano silicon oxide. The brick is prepared from the following raw materials in percentage by weight: 70 to 80 weight percent of corundum particles and fine powder, 5 to 15 weight percent of aluminum silica powder, 6 to 8 weight percent of active alumina micro powder, 2 to 4 weight percent of carbon, 0.5 to 5 weight percent of boron-containing additive, 1 to 6 weight percent of nano silicon dioxide, and 4 to 4.5 weight percent of resin binder. The low-carbon aluminum-carbon unburned sliding plate brick is prepared by the following steps of: dispersing the nano silicon oxide into phenolic resin containing a volatile organic solvent by adopting a chemical dispersion assisted ultrasonic dispersion method, mixing, forming and drying. By introducing the nano silicon oxide, low-temperature sintering and low-temperature chemical reaction are promoted, the medium and low temperature strength and the high temperature service performance of the unburned sliding plate are improved, the service life of the unburned sliding plate is prolonged, and the safety and the reliability of the unburned sliding plate are also improved; the hot strength at the temperature of between 500 and 600 DEG C can reach 14 to 18MPa and is obviously higher than the hot strength (2 to 5MPa) of the common unburned sliding plate at the temperature; and the key technical problem of low medium and low temperature strength of the unburned sliding plate is solved.
Description
technical field:
The invention belongs to steel-making continuous casting technical field of refractory materials, relate to a kind of low-carbon (LC) aluminium carbon containing nano silicon oxide of controlling molten steel flow and flow velocity and do not burn slide brick and preparation method.
background technology:
Slide plate is steel-making continuous casting critical function element, has molten steel injection, flow control function, and its reliability is related to the security of steelmaking process.In use be subject to the erosive wear of strong thermal shocking, high-temperature molten steel and the erosion of surrounding medium, working conditions is very harsh.At present both at home and abroad sliding material, taking aluminium carbon and aluminium zirconium carbonaceous as main, need bury under carbon condition and burn till in high temperature (1500 DEG C of left and right) time prepared by this type of slide plate, and cost is high, and energy consumption is large, seriously polluted, and initial cost is high, and the production cycle is long, complicated process of preparation.And the oxidizable short texture that causes of carbon causes high-temperature behavior decline and then affect work-ing life, and higher carbon content is unfavorable for the smelting of Clean Steel.
Do not burn slide plate technique simple, save the operation of the high energy consumptions such as high temperature burns till, immersion oil, destructive distillation, sand removal, high pollution, and can save initial cost, production cycle shortens, energy-conserving and environment-protective, production cost is low, and economic and social benefit is remarkable, meets the energy-saving and emission-reduction of country's promotion, the requirement of low-carbon (LC) cleaner production.But because resin oxygenolysis causes in slide plate, low temperature (300-700 DEG C) intensity obviously reduces, and produce intensity low ebb at about 500-600 DEG C, piece is fallen in the easy plucking of slipping plane, on-slip district in use to cause slide plate, even occur breaking etc., work-ing life is low, quality is unstable, has limited it in Large Steel is wrapped or variety steel is smelted application.
summary of the invention:
For solution, never to burn in slide plate low temperature intensity low, fall piece, even occur breaking in the easy plucking of slipping plane, on-slip district in use, work-ing life is low, the unsettled problem of quality to cause slide plate, the object of this invention is to provide a kind of have higher middle low temperature intensity and hot strength, good heat-shock resistance, oxidation-resistance and resistance to fouling do not burn low-carbon (LC) aluminum-carbon sliding material and preparation method thereof containing nano silicon oxide.
Technical scheme of the present invention realizes in the following manner:
A kind of low-carbon (LC) aluminium carbon containing nano silicon oxide does not burn slide brick, it is made up of the raw material of following weight proportioning: the aluminium silica flour of the corundum in granules of 70～80wt% and fine powder, 5～15wt%, the Reactive alumina of 6-8wt%, 2～4wt% carbon, boron-containing additive 0.5～5wt%, nano silicon 1-6 wt%; The phenolic resin binder of additional 4～4.5wt%.
The preferred technical solution of the present invention:
Low-carbon (LC) aluminium carbon containing nano silicon oxide does not burn a slide brick, and it is made up of the raw material of following weight proportioning, white fused alumina particle and fine powder 78wt%, Al powder 4 wt%, Si powder 1 wt%, Reactive alumina 8 wt%, graphite 1 wt%, carbon black 1 wt%, B
4c 1 wt%, nano silicon 3～6 wt%, the phenolic resin binder of additional 4～4.5 wt%.
Another optimal technical scheme of the present invention:
A kind of low-carbon (LC) aluminium carbon containing nano silicon oxide does not burn slide brick, it is made up of the raw material of following weight proportioning, the plate diamond spar particle of 80wt% and fine powder, Al powder 3 wt%, the Reactive alumina of Si powder 2wt%, 8wt%, 2wt% carbon, boron-containing additive 5wt%, nano silicon 1-3 wt%; The phenolic resin binder of additional 4～4.5wt%.
Another optimal technical scheme of the present invention:
A kind of low-carbon (LC) aluminium carbon containing nano silicon oxide does not burn slide brick, it is made up of the raw material of following weight proportioning, white fused alumina particle 20 wt%, compact alumina particle 15 wt%, plate diamond spar particle and fine powder 40wt%, aluminium powder 6wt%, silica flour 2 wt%, Reactive alumina 8 wt%, carbon black 2 wt%, B
4c 2 wt%, nano silicon 5 wt%, the phenolic resin binder of additional 4～4.5 wt%.
Another optimal technical scheme of the present invention:
Low-carbon (LC) aluminium carbon containing nano silicon oxide does not burn a slide brick, and it is made up of the raw material of following weight proportioning, compact alumina particle and fine powder 77wt%, aluminium powder 7wt%, silica flour 4 wt%, Reactive alumina 7 wt%, carbon black 2 wt%, B
4c 1 wt%, nano silicon 2 wt%, the phenolic resin binder of additional 4～4.5 wt%.
The above-mentioned preparation method who does not burn slide brick containing the low-carbon (LC) aluminium carbon of nano silicon oxide:
1) first nano silicon is dispersed in volatile organic solvent by chemical process, then the organic solvent of nano-silica-containing is dispersed in to the resin of making nano-silica-containing in phenolic resin binder by ultrasonic wave;
2) first metallic aluminium powder and silica flour are mixed, then by corundum fine powder, Reactive alumina, carbon and B
4c mixes, then adds metallic aluminium, the silicon composite powder of prior mixing, and in bipyramid stirrer, mixing becomes powder mix;
3) getting corundum in granules is uniformly mixed, separately get the resin of nano-silica-containing, first add 2/3, it is fully mixed with corundum in granules, corundum in granules is fully wrapped up, and then adds above-mentioned steps 2) in prior 1/3 further fully mixing of the powder mix of mixing and residue nano-silica-containing resin;
4) material step 3) being mixed carries out 24～30h ageing mixture, and compression moulding, 150～300 DEG C of dry 24h hole, hoop-driving, grind, sticky shell, are coated with face operation and make containing the low-carbon (LC) aluminium carbon of nano silicon oxide and do not burn slide brick.
The preparation method that the described low-carbon (LC) aluminium carbon containing nano silicon oxide does not burn slide brick: its nano silicon purity is greater than 99.5%, and particle diameter is less than 100nm.
The preparation method that the described low-carbon (LC) aluminium carbon containing nano silicon oxide does not burn slide brick: its volatile organic solvent is the one in dehydrated alcohol, acetone and ether.
The described preparation method who does not burn slide brick containing the low-carbon (LC) aluminium carbon of nano silicon oxide, the purity of its corundum is greater than 98.5%, grain graininess is less than 3mm, powder particle size is less than 0.044mm; Reactive alumina purity is greater than 99%, granularity is less than 5 μ m; Boron-containing additive granularity is less than 0.044mm.
The preparation method that the described low-carbon (LC) aluminium carbon containing nano silicon oxide does not burn slide brick, described in it, carbon is: graphite or carbon black; Described corundum in granules is: compact alumina particle, plate diamond spar particle or white fused alumina particle.
Nano silica powder has larger specific surface area, higher reactive behavior and good short nodulizing.The present invention introduces nano silicon in low-carbon (LC) aluminum-carbon sliding, and nano silicon has and helps preferably sintering character, low temperature acceleration of sintering; Thereby nano silicon also has higher reactive behavior promotes the chemical reaction in matrix to form at a lower temperature Ceramic bond phase, to solve the wherein low key technical problem of low temperature intensity, the high-temperature behaviors such as hot strength, heat-shock resistance, oxidation-resistance and the resistance to fouling of sliding material are not burnt in raising simultaneously, thereby improve work-ing life and the safe reliability of not burning slide plate.But nano-powder is very easily reunited, thereby its superperformance is lost, even to material production disadvantageous effect, so far the dispersion of nano-powder in carbonaceous material is still insoluble key issue, the present invention adopts the method that chemical dispersion assisting ultrasonic is disperseed that nano silicon is distributed to containing in the resol of volatile organic solvent, has well solved this problem.
Positively effect of the present invention is:
1, the present invention has the advantages that carbon content is low, and current aluminium carbon, aluminum-zirconium-carbon slide total carbon content 7-14% do not burn slide brick carbon content containing the low-carbon (LC) aluminium carbon of nano silicon oxide and be down to 2-4%, are conducive to Clean Steel and smelt.
2, the present invention adopts not firing technique, and effects of energy conservation and environmental protection is remarkable, has reduced labour intensity, and technique is simple, shortens the production cycle, reduces production costs, and has good economic benefit and social benefit.
3, the present invention adopts the method that chemical dispersion assisting ultrasonic is disperseed, and silica nanometer powder is uniformly dispersed in material, can give full play to its effect.
4, the nano silicon that the present invention introduces, has promoted low-temperature sintering and cryochemistry reaction, has improved middle low temperature intensity and the applied at elevated temperature performance of not burning slide plate, and then has improved work-ing life and the safe reliability of not burning slide plate.
5, the hot strength of 500-600 of the present invention DEG C can reach 14MPa-18MPa, apparently higher than the common hot strength (2-5MPa) of slide plate at this temperature that do not burn, has solved and has not burnt the gordian technique difficult problem that in slide plate, low temperature intensity is low.
6, the nano silicon of the present invention's introducing promotes that under Al low temperature, reaction generates ceramic phase, promotes growing of Al, Si non-oxidized substance SiC, AlN under high temperature, and forms the chain network structure of intersection, can significantly improve heat-shock resistance and the hot strength of material.
embodiment
Below in conjunction with embodiment, the invention will be further described:
embodiment 1
Each raw material weight proportioning is: white fused alumina particle and fine powder 78wt%, Al powder 4 wt%, Si powder 1 wt%, Reactive alumina 8 wt%, graphite 1 wt%, carbon black 1 wt%, B
4c 1 wt%, nano silicon 6 wt%, the resin of additional 4～4.5 wt%.
Preparation method:
1) first nano silicon is dispersed in volatile organic solvent by chemical process, then the organic solvent of nano-silica-containing is dispersed in resol, disperses to make for 5 minutes by ultrasonic wave;
2) again granularity is less than to 0.044mm, purity and is greater than 98.5% metallic aluminium powder and granularity and is less than 0.040mm, purity and is greater than 98.5% silica flour and mixes, then by white fused alumina fine powder, Reactive alumina, graphite, carbon black and B
4c mixes, then adds metallic aluminium, the silicon composite powder of prior mixing, and in bipyramid stirrer, mixing becomes powder mix;
3) get the resin of nano-silica-containing, first add 2/3, it is fully mixed with white fused alumina particle, particle is fully wrapped up, and then add above-mentioned steps 2) in powder mix and residue 1/3 resin of mixing further fully mix in advance;
4) by above-mentioned steps 3) material that mixes carries out 24～30h ageing mixture, and compression moulding, 150～300 DEG C of dry 24h, hole, hoop-driving, grind, sticky shell, be coated with face operation and make containing the low-carbon (LC) aluminium carbon of nano silicon oxide and do not burn slide brick.
Wherein drying process requires as follows:
the prepared low-carbon (LC) aluminium carbon containing nano silicon oxide does not burn the hot modulus of rupture of slide brick 500-600 DEG C and reaches 16MPa.
embodiment 2
Each raw material weight proportioning is compact alumina particle 22 wt%, plate diamond spar particle and fine powder 50 wt%, aluminium powder 10 wt%, silica flour 5wt%, Reactive alumina 8wt%, graphite 2 wt%, ZrB
22 wt%, nano silicon 1 wt%, the resol of additional 4～4.5 wt%.
1) first nano silicon is dispersed in acetone by chemical process, then with ultrasonic wave by the organic solvent of nano-silica-containing be dispersed in resol, ultrasonic dispersion 2 minutes;
2) again granularity is less than to 0.044mm, purity and is greater than 98.5% metallic aluminium powder and granularity and is less than 0.040mm, purity and is greater than 98.5% silica flour and mixes, then by plate diamond spar fine powder, Reactive alumina, graphite and ZrB
2mix, then add metallic aluminium, the silicon composite powder of prior mixing, in bipyramid stirrer, mixing becomes powder mix;
3) get respectively compact alumina particle and plate diamond spar particle is uniformly mixed, separately get the resin of nano-silica-containing, first add 2/3, it is fully mixed with corundum in granules, particle is fully wrapped up, and then add the powder mix of above-mentioned prior mixing and residue 1/3 resin further fully to mix;
4) the above-mentioned material mixing is carried out to 24～30h ageing mixture, compression moulding, 150～300 DEG C of baking 24h, hole, hoop-driving, grind, sticky shell, be coated with face operation and make containing the low-carbon (LC) aluminium carbon of nano silicon oxide and do not burn slide brick.Wherein drying process requires as embodiment 1.The prepared low-carbon (LC) aluminium carbon containing nano silicon oxide does not burn the hot modulus of rupture of slide brick 500-600 DEG C and reaches 14MPa.
embodiment 3
Each raw material weight proportioning is: plate diamond spar particle and fine powder 77 wt%, aluminium powder 8 wt%, silica flour 3wt%, Reactive alumina 6 wt%, carbon black 2 wt%, BN 1 wt%, nano silicon 3 wt%, the resol of additional 4～4.5 wt%.
1) first nano silicon is dispersed in volatile ether by chemical process, then the organic solvent of nano-silica-containing is dispersed in resol by ultrasonic wave to ultrasonic dispersion 3 minutes;
2) granularity being less than to 0.044mm, purity is greater than 98.5% metallic aluminium powder and granularity and is less than 0.040mm, purity and is greater than 98.5% silica flour and mixes again, then plate diamond spar fine powder, Reactive alumina, carbon black and BN are mixed, the metallic aluminium, the silicon composite powder that add again prior mixing, in bipyramid stirrer, mixing becomes powder mix;
3) get the resin of nano-silica-containing, first add 2/3, it is fully mixed with plate diamond spar particle, particle is fully wrapped up, and then add the powder mix of above-mentioned prior mixing and residue 1/3 resin further fully to mix;
4) the above-mentioned material mixing is carried out to 24～30h ageing mixture, compression moulding, 150～300 DEG C of dry 24h, hole, hoop-driving, grind, sticky shell, be coated with face operation and make containing the low-carbon (LC) aluminium carbon of nano silicon oxide and do not burn slide brick.Wherein drying process requires as embodiment 1.
?the prepared low-carbon (LC) aluminium carbon containing nano silicon oxide does not burn the hot modulus of rupture of slide brick 500-600 DEG C and reaches 18MPa.
embodiment 4
Each raw material weight proportioning is: white fused alumina particle 20 wt%, compact alumina particle 15 wt%, plate diamond spar particle and fine powder 40wt%, aluminium powder 6wt%, silica flour 2 wt%, Reactive alumina 8 wt%, carbon black 2 wt%, B
4c 2 wt%, nano silicon 5 wt%, the resol of additional 4～4.5 wt%.
Preparation method:
1) first nano silicon is dispersed in volatile dehydrated alcohol by chemical process, then the organic solvent of nano-silica-containing is dispersed in resol by ultrasonic wave to ultrasonic dispersion 5 minutes;
2) again granularity is less than to 0.044mm, purity and is greater than 98.5% metallic aluminium powder and granularity and is less than 0.040mm, purity and is greater than 98.5% silica flour and mixes, then by plate diamond spar fine powder, Reactive alumina, carbon black and B
4c mixes, then adds metallic aluminium, the silicon composite powder of prior mixing, and in bipyramid stirrer, mixing becomes powder mix;
3) getting respectively white fused alumina particle, compact alumina particle and plate diamond spar particle is uniformly mixed, separately get the resin of nano-silica-containing, first add 2/3, it is fully mixed with corundum in granules, particle is fully wrapped up, and then add the powder mix of above-mentioned prior mixing and residue 1/3 resin further fully to mix;
4) the above-mentioned material mixing is carried out to 24～30h ageing mixture, compression moulding, 150～300 DEG C of dry 24h, hole, hoop-driving, grind, sticky shell, be coated with face operation and make containing the low-carbon (LC) aluminium carbon of nano silicon oxide and do not burn slide brick.Wherein drying process requires as embodiment 1.The prepared low-carbon (LC) aluminium carbon containing nano silicon oxide does not burn the hot modulus of rupture of slide brick 500-600 DEG C and reaches 15MPa.
embodiment 5
Each raw material weight proportioning is compact alumina particle and fine powder 77wt%, aluminium powder 7wt%, silica flour 4 wt%, Reactive alumina 7 wt%, carbon black 2 wt%, B
4c 1 wt%, nano silicon 2 wt%, the resol of additional 4～4.5 wt%.
Preparation method:
1) first nano silicon is dispersed in volatile acetone by chemical process, then the organic solvent of nano-silica-containing is dispersed in resol by ultrasonic wave to ultrasonic dispersion 3 minutes;
2) again granularity is less than to 0.044mm, purity and is greater than 98.5% metallic aluminium powder and granularity and is less than 0.040mm, purity and is greater than 98.5% silica flour and mixes, then by compact alumina fine powder, Reactive alumina, carbon black and B
4c mixes, then adds metallic aluminium, the silicon composite powder of prior mixing, and in bipyramid stirrer, mixing becomes powder mix;
2) get the resin of nano-silica-containing, first add 2/3, it is fully mixed with compact alumina particle, particle is fully wrapped up, and then add the powder mix of above-mentioned prior mixing and residue 1/3 resin further fully to mix;
4) the above-mentioned material mixing is carried out to 24～30h ageing mixture, compression moulding, 150～300 DEG C of dry 24h, hole, hoop-driving, grind, sticky shell, be coated with face operation and make containing the low-carbon (LC) aluminium carbon of nano silicon oxide and do not burn slide brick.Wherein drying process requires as embodiment 1.The prepared low-carbon (LC) aluminium carbon containing nano silicon oxide does not burn the hot modulus of rupture of slide brick 500-600 DEG C and reaches 17MPa.
Claims (7)
1. the low-carbon (LC) aluminium carbon containing nano silicon oxide does not burn slide brick, it is made up of the raw material of following weight proportioning: the aluminium silica flour of the corundum in granules of 70～80wt% and fine powder, 5～15wt%, the Reactive alumina of 6-8wt%, 2～4wt% carbon, boron-containing additive 0.5～5wt%, nano silicon 1-6wt%; The phenolic resin binder of additional 4～4.5wt%,
Described boron-containing additive is B
4c.
2. the low-carbon (LC) aluminium carbon containing nano silicon oxide according to claim 1 does not burn slide brick, it is characterized in that: it is made up of the raw material of following weight proportioning white fused alumina particle and fine powder 78wt%, Al powder 4wt%, Si powder 1wt%, Reactive alumina 8wt%, graphite 1wt%, carbon black 1wt%, B
4c1wt%, nano silicon 3～6wt%, the phenolic resin binder of additional 4～4.5wt%.
3. the low-carbon (LC) aluminium carbon containing nano silicon oxide according to claim 1 does not burn slide brick, it is characterized in that: it is made up of the raw material of following weight proportioning white fused alumina particle 20wt%, compact alumina particle 15wt%, plate diamond spar particle and fine powder 40wt%, aluminium powder 6wt%, silica flour 2wt%, Reactive alumina 8wt%, carbon black 2wt%, B
4c2wt%, nano silicon 5wt%, the phenolic resin binder of additional 4～4.5wt%.
4. the low-carbon (LC) aluminium carbon containing nano silicon oxide according to claim 1 does not burn slide brick, it is characterized in that: it is made up of the raw material of following weight proportioning, compact alumina particle and fine powder 77wt%, aluminium powder 7wt%, silica flour 4wt%, Reactive alumina 7wt%, carbon black 2wt%, B
4c1wt%, nano silicon 2wt%, the phenolic resin binder of additional 4～4.5wt%.
5. a preparation method who does not burn slide brick according to the low-carbon (LC) aluminium carbon containing nano silicon oxide described in claim 1,2,3 or 4:
1) first purity is greater than to 99.5% by chemical process, the nano silicon that particle diameter is less than 100nm is dispersed in volatile organic solvent, then by ultrasonic wave, the organic solvent of nano-silica-containing is dispersed in to phenolic resin binder and makes nanometer titanium dioxide silicone resin;
2) first metallic aluminium powder and silica flour are mixed, then by corundum fine powder, Reactive alumina, carbon and B
4c mixes, then adds metallic aluminium, the silicon composite powder of prior mixing, and in bipyramid stirrer, mixing becomes powder mix;
3) getting corundum in granules is uniformly mixed, separately get nano-silica-containing resin, first add 2/3, it is fully mixed with corundum in granules, corundum in granules is fully wrapped up, and then adds above-mentioned steps 2) in prior 1/3 further fully mixing of the powder mix of mixing and residue nano-silica-containing resin;
4) by step 3) material that mixes carries out 24～30h ageing mixture, and compression moulding, 150～300 DEG C of baking 24h, hole, hoop-driving, grind, sticky shell, be coated with face operation and make containing the low-carbon (LC) aluminium carbon of nano silicon oxide and do not burn slide brick;
Described volatile organic solvent is the one in dehydrated alcohol, acetone and ether.
6. the preparation method that the low-carbon (LC) aluminium carbon containing nano silicon oxide according to claim 5 does not burn slide brick, is characterized in that: the purity of corundum is greater than 98.5%, grain graininess is less than 3mm, powder particle size is less than 0.044mm; Reactive alumina purity is greater than 99%, granularity is less than 5 μ m; Boron-containing additive is that granularity is less than 0.044mm.
7. the preparation method who does not burn slide brick containing the low-carbon (LC) aluminium carbon of nano silicon oxide according to claim 6, is characterized in that: described carbon is: graphite or carbon black; Described corundum in granules is: compact alumina particle, plate diamond spar particle or white fused alumina particle.
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