CN1686921A - Method for fabricating low carbon Al2O3 slide brick based on bauxite beta-Sialon - Google Patents
Method for fabricating low carbon Al2O3 slide brick based on bauxite beta-Sialon Download PDFInfo
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Abstract
The present invention provides a preparation method of low-carbon Al2O3-Alumine base beta-sialon slide board brick. Said method uses corundum, alumine base beta-Sialon, active aluminum oxide, graphite or carbon black and antioxidant as raw material, uses resin as binding agent and adopts the following steps: machine-pressing and forming, firing at 1300-1600 deg.C under the condition of reduction atmosphere, oil-soaking, dry distillation, drilling hole, hooping, grinding and coating surface so as to obtain the invented slide board brick. Said invention is applicable to produce special steel, in particular produce steel.
Description
Affiliated field:
The invention belongs to fire resistive material product manufacturing technology field, being specifically related to a kind of is the low-carbon (LC) Al of main raw material with corundum and based on bauxite beta-Sialon
2O
3The preparation method of-based on bauxite beta-Sialon slide brick.
Background technology:
Slide gate nozzle is the key part of control MOLTEN STEEL FLOW, and the normal operation to continuous casting production of its security and long lifetime plays a crucial role.And slide plate is the most important components of slide gate nozzle, also is the maximum element of accepting the risk in each parts of slide gate nozzle, and it is perfectly safe to accomplish.
The domestic main material of slide plate is aluminium carbon and aluminium zirconium carbonaceous at present, and mainly with not burning or burnt aluminum carbonaceous slide plate, large-scale ladle mainly uses aluminium zirconium carbonaceous slide plate to middle-size and small-size ladle.Therefore carbon is widely used in the slide brick owing to have good resistance to fouling and wear resistance.Aluminium carbon and aluminium zirconium carbonaceous slide brick contain the carbon of 5-8%, and in steel-making continuous casting used, the carbon in the slide plate infiltrated molten steel, thereby molten steel is produced pollution, influenced the quality of soft steel, Clean Steel.So present aluminium carbon and aluminium zirconium carbonaceous slide plate have been difficult to satisfy the particularly needs of Clean Steel production of special steel.The sliding material that the Clean Steel production requirement is used with low-carbon (LC), low silicon content even carbon less and silicon less for well.
Sialon has excellent oxidation-resistance and heat-shock resistance and good hot strength, has been widely used in the high-grade refractory materials in recent years.In refractory materials, introduce Sialon, can improve the use properties of refractory materials, improve work-ing life.In slide plate, introduce Sialon, can obviously improve oxidation-resistance, heat-shock resistance and the hot strength of slide plate, improve slide plate work-ing life.
Document " technical study of high-quality slide gate nozzle " (heavy-duty machinery science and technology, 2003,5:13-19) provide a kind of preparation method of non-oxidized substance combined corundum slide plate.This method is main raw material with the corundum, and metallic silicon power and aluminium powder are additive, adopts the high-temperature ammonolysis method to generate Sialon/Si in slide plate
3N
4Deng non-oxidized substance in conjunction with phase.This method adopts the direct nitrogenize of high temperature to produce non-oxidized substance combined corundum slide plate, and production cost is higher.
Document " performance and the application of Sialon combined corundum slide plate " (refractory materials, 2003,5:303-304) introduced the method that a kind of direct nitridation method prepares Sialon combined corundum slide plate.Main method is: with plate diamond spar, metallic silicon power and aluminium powder is main raw material, is wedding agent with spent pulping liquor, mechanical pressing, and it is interior nitridation sintered to enter nitriding furnace after the drying, and nitriding temperature is 1450-1470 ℃, and soaking time is 8-12 hour.This method adopts the high temperature direct nitridation method to produce Sialon combined corundum slide plate, the ingredient requirement strictness, and the production process equipment complexity, product cost is higher.
The patent (Granted publication CN on the 14th 1108212C in May 2003 Granted publication day) of " containing the grand sliding sprue tile for smelting of match " by name has been introduced a kind of preparation method who contains the grand sliding sprue tile for smelting of match.The sliding sprue tile for smelting that this patent is introduced, its composition is by weight percentage: the content 17～45% of Sialon, sintered alumina or fused alumina 30～80%, silicon carbide or norbide 1～10%.Contain the grand sliding sprue tile for smelting of match in order to prepare, this patent adopts following three kinds of methods: 1. and utilize Pure Silicon Metal, aluminum oxide and other sintering aids to be raw material, directly high-temperature ammonolysis reaction in nitriding furnace, thus preparation contains the grand refractory materials of match.2. adopting silicon nitride, aluminum oxide and other sintering aid is raw material, directly high-temperature ammonolysis reaction in nitriding furnace, thus preparation contains the grand refractory materials of match.3. adopting synthetic good Sialon fine powder, alumina particle and other sintering aids is raw material, directly high-temperature ammonolysis reaction in nitriding furnace, thus preparation contains the grand refractory materials of match.The sliding sprue tile for smelting of this patent preparation also is to adopt the production of high temperature direct nitridation method, and the production technique equipment is complicated, and cost is higher.
From above document and patent analyses, the slide plate of currently reported containg sialon all prepares by direct high-temperature ammonolysis agglomerating method, the production process equipment complexity, and cost is higher, is difficult to realize suitability for industrialized production.
Summary of the invention:
The objective of the invention is to utilize the based on bauxite beta-Sialon of Chinese natural alumine for feedstock production, compound with corundum material, adopt reducing atmosphere (burying carbon) firing process to be prepared into a kind of low-carbon (LC) alumina base Al
2O
3-beta-Sialon slide brick overcoming the deficiency that prior art production process equipment complexity, cost are higher, be difficult to realize suitability for industrialized production, and reduces the carbon content of material greatly.
Technical scheme of the present invention is:
Low-carbon (LC) Al
2O
3The preparation method of-based on bauxite beta-Sialon slide brick is a raw material with corundum in granules and fine powder, based on bauxite beta-Sialon particle and fine powder, activated alumina, adopts and buries reducing atmosphere firing process under the carbon condition, the steps include:
With parts by weight is corundum in granules and the fine powder of 55-85%, based on bauxite beta-Sialon particle and/or the fine powder of 5-25%, 2-12% activated alumina, 0-2% graphite or carbon black, the 2-10% oxidation inhibitor mixes, and adds the resol of raw material total amount 3-6%, mechanical pressing after mixing, drying;
Forming composition is put into sintering oven, burn till under reducing atmosphere, 1300 ℃-1580 ℃ of firing temperatures are incubated 6-20 hour;
With above-mentioned burned material immersion oil, destructive distillation, punching, hoop-driving, grind, be coated with face processing, promptly get product.
Wherein:
Corundum in granules is one or more in sintering plate corundum, alundum, fused white corundum, electric smelting compact alumina, the alumina-base fused corundum, and particle grain size is 5-0.1mm.
Corundum fine powder is one or more in sintering plate corundum, alundum, fused white corundum, electric smelting compact alumina, the alumina-base fused corundum, and the particle diameter of fine powder is less than 0.088mm.
The content of beta-Sialon is weight ratio 50-95% in the based on bauxite beta-Sialon particle, and grain diameter is 2-0.1mm.
The content of beta-Sialon is weight ratio 50-95% in the based on bauxite beta-Sialon fine powder, and the fine powder particle diameter is less than 0.088mm.
In graphite or the carbon black, C 〉=90%, granularity is less than 0.20mm.
Oxidation inhibitor is one or more in metallic aluminium powder, metallic silicon power, norbide or the silicon carbide, and granularity is 0.088-0.001mm.
Compared with prior art, the invention has the advantages that:
1. compare with existing aluminum-carbon sliding tile with the slide brick of this inventive method preparation, have excellent oxidation-resistance and heat-shock resistance, higher hot modulus of rupture.
2. the used non-oxidized substance of the present invention is from the based on bauxite beta-Sialon of natural alumine preparation, and raw materials cost is low, has made full use of the natural alumine resource of China's abundant again.
3. the reducing atmosphere that firing process adopts among the present invention burns till simplyr than nitridation sintered explained hereafter equipment, and production technique is easy to control, the production efficiency height, so cost is lower.
4. the slide brick carbon content of the present invention preparation is extremely low, can reduce that carbon is applicable to the continuous casting operation of various Clean Steels such as big-and-middle-sized ladle and basket pouring soft steel, high-oxygen steel, high mangaenese steel, calcium treated steel to the pollution of molten steel in the use.
Embodiment
Below in conjunction with embodiment the present invention is further described, but is not limited to the following example.
Embodiment 1:
Raw material:
Selecting sintering plate corundum particle, fused white corundum powder, based on bauxite beta-Sialon powder (content of beta-Sialon is weight ratio 92%), activated alumina, carbon content for use is raw material greater than 97% graphite, metallic aluminium powder, and its granularity sees Table 1,
The size composition of table 1 raw material
| Form | The sintering plate corundum particle | The fused white corundum powder | The based on bauxite beta-Sialon powder | Graphite | Metallic aluminium powder |
| Granularity mm | 5-0.1 | 0.088-0.001 | ??0.088-0.001 | ??0.16-0.001 | ????0.088-0.001 |
The weight percent of various raw materials is: sintering plate corundum particle 60%, 17% part in fused white corundum powder, based on bauxite beta-Sialon powder 10%, 8% part of activated alumina, 2% part in graphite, metallic aluminium powder 3%.
Preparation:
Mix according to the above ratio raw materials used, the resol that adds raw material total amount 5% is as wedding agent, the back mechanical pressing that mixes, drying; 1480 ℃ are burnt till under reducing atmosphere, soaking time 12 hours; And then immersion oil, destructive distillation, punching, hoop-driving, grind, be coated with face processing, make low-carbon (LC) Al
2O
3-based on bauxite beta-Sialon slide brick.
After testing, prepared slide brick physical and chemical index is: carbon content is 5.6%, apparent porosity 6%, volume density 3.10g/cm
3, cold crushing strength 135Mpa, high temperature break resistant intensity 27.9Mpa (, bury carbon and be incubated under the halfhour condition) at 1400 ℃.
Embodiment 2
Raw material: selecting alundum particle, fused white corundum powder, based on bauxite beta-Sialon particle (content of beta-Sialon is weight ratio 88%), based on bauxite beta-Sialon powder (content of beta-Sialon is weight ratio 90%), activated alumina, carbon content for use is raw material greater than 98% carbon black, metallic aluminium powder and norbide, and the granularity of raw material sees Table 2.
The size composition of table 2 raw material
| Form | The alundum particle | The fused white corundum powder | The based on bauxite beta-Sialon particle | The based on bauxite beta-Sialon powder | Carbon black | Metallic aluminium powder | Norbide |
| mm | 5-0.1 | 0.088- 0.001 | 2-0.1 | 0.074- 0.001 | ?0.01- ?0.001 | 0.088- 0.001 | 0.074- 0.001 |
The weight percent of various raw materials is: alundum particle 53%, fused white corundum powder 16%, based on bauxite beta-Sialon particle 7%, based on bauxite beta-Sialon powder 12%, activated alumina 5%, metallic aluminium powder 3%, norbide 2%, carbon black 2%.
Preparation: mix according to the above ratio raw materials used, add the resol of raw material total amount 5.5%, the back mechanical pressing that mixes, drying; Burn till soaking time 10 hours for following 1530 ℃ at reducing atmosphere (burying carbon); And then immersion oil, destructive distillation, punching, hoop-driving, grind, be coated with face processing, make low-carbon (LC) Al
2O
3-based on bauxite beta-Sialon slide brick.
After testing, prepared slide brick physical and chemical index is: carbon content is 5.8%, apparent porosity 7%, volume density 3.06g/cm
3, cold crushing strength 117Mpa, high temperature break resistant intensity 25.7Mpa (, bury carbon and be incubated under the halfhour condition) at 1400 ℃.
Embodiment 3
Raw material: selecting alumina-base fused corundum in granules, sintering plate corundum powder, based on bauxite beta-Sialon powder (content of beta-Sialon is weight ratio 75%), activated alumina, carbon content for use is raw material greater than 92% graphite, metallic silicon power.The granularity of raw material sees Table 3.
The size composition of table 3 raw material
| Form | Alumina-base fused corundum in granules | The sintering plate corundum powder | The based on bauxite beta-Sialon powder | Graphite | Metallic silicon power |
| mm | ?5-0.1 | ???0.088-0.001 | ??0.088-0.001 | ?0.16-0.001 | ?0.044-0.001 |
Various raw materials by weight are: alumina-base fused corundum in granules 65%, sintering plate corundum powder 15%, based on bauxite beta-Sialon powder 10%, activated alumina 5%, metallic silicon power 4%, graphite 1%.
Preparation: mix according to the above ratio raw materials used, add the resol of raw material total amount 5.0%, the back mechanical pressing that mixes, drying; 1450 ℃ are burnt till under reducing atmosphere, soaking time 8 hours; And then immersion oil destructive distillation, punching, hoop-driving, grind, be coated with face processing, make a kind of low-carbon (LC) Al
2O
3-based on bauxite beta-Sialon slide brick.
After testing, prepared slide brick physical and chemical index is: 4.7%, and apparent porosity 8%, volume density 3.03g/cm
3, cold crushing strength 121Mpa, high temperature break resistant intensity 21.3Mpa (, bury carbon and be incubated under the halfhour condition) at 1400 ℃.
Embodiment 4
Raw material: select alumina-base fused corundum in granules for use, the alundum powder, based on bauxite beta-Sialon particle (content of beta-Sialon is weight ratio 58%), based on bauxite beta-Sialon powder (content of beta-Sialon is weight ratio 67%), activated alumina, metallic silicon power, silicon carbide, carbon content is greater than 96% carbon black.The granularity of raw material sees Table 4.
The size composition of table 4 raw material
| Form | Alumina-base fused corundum in granules | The alundum powder | The based on bauxite beta-Sialon particle | The based on bauxite beta-Sialon powder | Carbon black | Metallic silicon power | Silicon carbide |
| mm | 5-0.1 | 0.088- 0.001 | 1-0.1 | 0.088- 0.001 | 0.01- 0.001 | 0.074- 0.001 | 0.088- 0.001 |
Various raw materials by weight are: alumina-base fused corundum in granules 54%, alundum powder 21%, based on bauxite beta-Sialon particle 6%, based on bauxite beta-Sialon powder 6%, activated alumina 7%, silicon carbide 5%, carbon black 1%.
Preparation: mix according to the above ratio raw materials used, add the resol of raw material total amount 5.2%, the back mechanical pressing that mixes, drying; 1380 ℃ are burnt till under reducing atmosphere, soaking time 16 hours; And then immersion oil, destructive distillation, punching, hoop-driving, grind, be coated with face processing, make low-carbon (LC) Al
2O
3-based on bauxite beta-Sialon slide brick.
After testing, prepared slide brick physical and chemical index is: carbon content is 4.8%, apparent porosity 9%, volume density 2.98g/cm
3, cold crushing strength 113Mpa, high temperature break resistant intensity 19.1Mpa (, bury carbon and be incubated under the halfhour condition) at 1400 ℃.
Embodiment 5
Raw material: select the sintering plate corundum particle for use, electric smelting compact alumina particle, alundum powder, based on bauxite beta-Sialon powder (content of beta-Sialon is weight ratio 84%), activated alumina, metallic aluminium powder, norbide.The granularity of raw material sees Table 5.
The size composition of table 5 raw material
| Form | The sintering plate corundum particle | Electric smelting compact alumina particle | The alundum powder | The based on bauxite beta-Sialon powder | Metallic aluminium powder | Norbide |
| mm | 5-3 | 3-0.1 | 0.044- 0.001 | 0.088- 0.001 | 0.074- 0.001 | 0.088- 0.001 |
Various raw materials by weight are: sintering plate corundum particle 15%, electric smelting compact alumina particle 45%, alundum powder 10%, based on bauxite beta-Sialon powder 15%, activated alumina 7%, metallic aluminium powder 5%, norbide 3%.
Preparation: mix according to the above ratio raw materials used, add the resol of raw material total amount 3.8%, the back mechanical pressing that mixes, drying; Burn till soaking time 14 hours for following 1570 ℃ at reducing atmosphere (burying carbon); And then immersion oil, destructive distillation, punching, hoop-driving, grind, be coated with face processing, make low-carbon (LC) Al
2O
3-based on bauxite beta-Sialon slide brick.
After testing, prepared slide brick physical and chemical index is: carbon content is 3.5%, apparent porosity 4%, volume density 3.15g/cm
3, cold crushing strength 189Mpa, high temperature break resistant intensity 30.5Mpa (, bury carbon and be incubated under the halfhour condition) at 1400 ℃.
Embodiment 6
Raw material: select the fused white corundum particle for use, fused white corundum powder, sintering plate corundum powder, based on bauxite beta-Sialon particle (content of beta-Sialon is weight ratio 78%), based on bauxite beta-Sialon powder (content of beta-Sialon is weight ratio 89%), activated alumina, metallic silicon power, norbide.The granularity of raw material sees Table 6
The size composition of table 6 raw material
| Form | The fused white corundum particle | The fused white corundum powder | The sintering plate corundum powder | The based on bauxite beta-Sialon particle | The based on bauxite beta-Sialon powder | Metallic silicon power | Norbide |
| mm | 5-0.1 | 0.088- 0.001 | 0.044- 0.001 | 1.5-0.1 | 0.074- 0.001 | 0.044- 0.001 | 0.074- 0.001 |
Various raw materials by weight are: fused white corundum particle 43%, fused white corundum powder 10%, sintering plate corundum powder 10%, based on bauxite beta-Sialon particle 12%, based on bauxite beta-Sialon powder 7%, activated alumina 11%, metallic silicon power 4%, norbide 3%.
Preparation: mix according to the above ratio raw materials used, add the resol of raw material total amount 4.2%, the back mechanical pressing that mixes, drying; Burn till soaking time 12 hours for following 1500 ℃ at reducing atmosphere (burying carbon); And then immersion oil, destructive distillation, hoop-driving, grind, be coated with face processing, make low-carbon (LC) Al
2O
3-based on bauxite beta-Sialon slide brick.
After testing, prepared slide brick physical and chemical index is: 3.6%, and apparent porosity 5%, volume density 3.10g/cm
3, cold crushing strength 162Mpa, high temperature break resistant intensity 27.1Mpa (, bury carbon and be incubated under the halfhour condition) at 1400 ℃.
Claims (7)
1. low-carbon (LC) Al
2O
3The preparation method of-based on bauxite beta-Sialon slide brick is a main raw material with corundum in granules and fine powder, based on bauxite beta-Sialon particle and fine powder, activated alumina, adopts and buries reducing atmosphere firing process under the carbon condition, it is characterized in that:
A. with parts by weight corundum in granules and the fine powder of 55-85%, based on bauxite beta-Sialon particle and/or the fine powder of 5-25%, the 2-12% activated alumina, 0-2% graphite or carbon black, the 2-10% oxidation inhibitor mixes, the resol that adds raw material total amount 3-6%, the back mechanical pressing that mixes, drying;
B. forming composition is put into sintering oven, burn till under reducing atmosphere, 1300 ℃-1580 ℃ of firing temperatures are incubated 6-20 hour;
C. with above-mentioned burned material immersion oil, destructive distillation, punching, hoop-driving, grind, be coated with face processing, promptly get product.
2. according to the described low-carbon (LC) Al of claim 1
2O
3The preparation method of-based on bauxite beta-Sialon slide brick, it is characterized in that: said corundum in granules is one or more in sintering plate corundum, alundum, fused white corundum, electric smelting compact alumina, the alumina-base fused corundum, and particle grain size is 5-0.1mm.
3. according to the described low-carbon (LC) Al of claim 1
2O
3The preparation method of-based on bauxite beta-Sialon slide brick, it is characterized in that: said corundum fine powder is one or more in sintering plate corundum, alundum, fused white corundum, electric smelting compact alumina, the alumina-base fused corundum, and the particle diameter of fine powder is less than 0.088mm.
4. according to the described low carbon back Al of claim 1
2O
3The preparation method of-alumina beta-Sialon slide brick is characterized in that: the content of beta-Sialon is weight ratio 50-95% in the said based on bauxite beta-Sialon particle, and grain diameter is 2-0.1mm.
5. according to the described low carbon back Al of claim 1
2O
3The preparation method of-alumina beta-Sialon slide brick is characterized in that: the content of beta-Sialon is weight ratio 50-95% in the said based on bauxite beta-Sialon fine powder, and the fine powder particle diameter is less than 0.088mm.
6. according to the described low-carbon (LC) Al of claim 1
2O
3The preparation method of-based on bauxite beta-Sialon slide brick is characterized in that: in said graphite or the carbon black, and C 〉=90%, granularity is less than 0.20mm.
7. require described arbitrary low-carbon (LC) Al according to aforesaid right
2O
3The preparation method of-based on bauxite beta-Sialon slide brick is characterized in that: said oxidation inhibitor is one or more in metallic aluminium powder, metallic silicon power, norbide or the silicon carbide, and granularity is 0.088-0.001mm.
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