CN1283394C - Aluminium zirconium carbon-boron nitride composite lateral sealing plate and its manufacturing method - Google Patents
Aluminium zirconium carbon-boron nitride composite lateral sealing plate and its manufacturing method Download PDFInfo
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- CN1283394C CN1283394C CN 03150584 CN03150584A CN1283394C CN 1283394 C CN1283394 C CN 1283394C CN 03150584 CN03150584 CN 03150584 CN 03150584 A CN03150584 A CN 03150584A CN 1283394 C CN1283394 C CN 1283394C
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Abstract
The present invention relates to an aluminium zirconium carbon-boron nitride composite lateral sealing plate which is composed of components (weight percentage) of 40 to 70% of corundum, 15 to 30% of zirconium mullite, 5 to 10% of alpha-Al2 O3 miropowder, 3 to 12% of carbon materials, 5 to 15% of hexagon boron nitride, 2 to 5% of metallic silicon powder and 5 to 15% of bonding agents. A fabrication method for the aluminium zirconium carbon-boron nitride composite lateral sealing plate comprises: firstly, boron nitride powder and corundum powder are dispersed, impregnated and mixed in an ethanol solution according to the previous compounding ratios; then, an obtained mixture of the boron nitride powder, the corundum powder and the ethanol solution is dried to obtain boron nitride mixed powder; the corundum, the zirconium mullite, zirconium dioxide, the carbon raw materials, raw materials of the boron nitride mixed powder and an antioxidant are stirred for premixing according to the compounding ratios; the previous mixed materials are mixed and granulated using phenolic resin as a binding agent, and after being dried, the mixed materials are pressed and formed. The intensity of the aluminium zirconium carbon-boron nitride composite lateral sealing plate is moderate and is corresponding to the friction of a crystallization roller. The use methods of the boron nitride materials are simplified, and the present invention has the advantages of high fabrication thermal shock stability, moderate material hardness and better molten steel erosion resistance.
Description
Technical field
The invention belongs to Inorganic Non-metallic Materials subject, high temperature engineering ceramics field.
Background technology
Twin-roll thin strip continuous casting is a nearly continuous casting process at a kind of nearly end.Strip caster is formed the molten bath by two water cooled rolls and a pair of side seal boards that rotate in opposite directions, annotates molten steel with submersed nozzle in the molten bath, and molten steel is in the surface solidification of two rollers, and solidified shell directly forms made-up belt by two water cooled rolls pressings; Side seal technology and side seal board are one of core technologies of thin strap continuous casting.Thin strap continuous casting technological requirement side seal board high-temperature ceramic refractory material has excellent comprehensive performances, must satisfy following the requirement:
(1) have good thermal shock resistance, heat distortion amount is little.
(2) good mechanical performance intensity, toughness under the high temperature.
(3) refractory steel aggressivity is strong.
(4) good heat-insulating property, poor with the molten steel wellability.
(5) material has suitable anti-wear energy.
In the specification of Chinese patent 91107479.1, the inventor provides a kind of side seal board that is made of two-layer composite, its basic unit is that thermal conductivity factor is low, again the high aluminium lamination refractory material of clay matter, vitreous silica matter and lightweight of certain intensity, surface layer to be arranged be that thickness is high fine and close glass ceramics or the enamel of 0.5-3mm.This way is had in mind and has been solved material cold problem of molten steel at molten steel, two roller and side seal board three calmodulin binding domain CaMs, but high fine and close glass ceramics or enamel hardness of surface layer is too high, very easily makes the copper coin wearing and tearing of two roller end faces, thus the service life of the two rollers of influence.
In the utility model patent of Chinese patent 98229485.9, mention the side seal board material that uses and be boron nitride.But single boron nitride material hardness is low, and especially boron nitride is easy to oxidation under hot conditions, and therefore single use boron nitride effect is unsatisfactory.
Chinese patent 95194684.6 has been invented a kind of strip caster and has been used the side.This side comprises a metal frame and a non-metallic plates.This non-metallic plates is made up of two parts, and a part is the friction zone that contacts with two rollers, and another part is and melts the middle section that steel contacts.Its friction zone is made up of a kind of boron nitride material of 15% of containing at least.And the friction zone is made up of several elements that splice mutually.Molten steel zone is preferably the pottery of carbon combination.This patent is only protected the structural design of side seal board, and is not mentioned to the side seal board material.
Chinese patent CN1091116A has announced a kind of based on zirconium corundum, mullite and boron nitride composite, its objective is comprehensive malleableize and reinforcement by based on zirconium corundum, mullite material and boron nitride material, obtaining a kind of is respectively that base-material and boron nitride are compound and be two kinds of compound composites of base-material and based on zirconium corundum, mullite with the boron nitride with the fused alumina zirconia.It is characterized by and carry out high temperature sintering after above-mentioned raw materials directly is mixed, this is too high in conjunction with the composite synthesis temperature of phase with pottery directly, is difficult to preparation.
Summary of the invention
Purpose of the present invention provides a kind of compound side seal board of aluminium zirconium carbon-boron nitride and manufacture method thereof, this compound side seal board intensity is moderate, adapt with the friction of crystallization roller, and simplify the using method of boron nitride material, and make good thermal shock stability, material hardness is moderate, refractory steel aggressivity is good.
For achieving the above object, technical scheme of the present invention is:
The compound side seal board of a kind of aluminium zirconium carbon-boron nitride, its weight percentages of components is:
Corundum 40-70%
Zirconium mullite 15-30%
α-Al
2O
3Micro mist 5-10%
Carbon materials 3-12%
Hexagonal boron nitride 5-15%
Metallic silicon power adds 2-5%
Binding agent adds 5-15%
Antioxidant adds 1-5%.
The compound side seal board of aluminium zirconium carbon-boron nitride of the present invention, its weight percentages of components is preferably:
Corundum 50-60%
Zirconium mullite 10-20%
α-Al
2O
3Micro mist 5-10%
Carbon materials 5-10%
Hexagonal boron nitride 6-15%
Metallic silicon power adds 2-5%
Binding agent adds 5-15%
Antioxidant adds 1-5%.
Wherein, described binding agent is phenolic resins or pitch.
Described antioxidant is one or more the combination in metallic aluminium powder, carborundum and the boron carbide.
Again, the ratio of corundum and zirconium mullite is 2: 1～4: 1; Because side seal board material one side contacts with molten steel, temperature is about 1500 ℃, and another side is a normal temperature environment, and the thermograde that material bore is 50 ℃/mm.The high 5-8 of thermograde that general refractory material bears doubly; For guaranteeing that compound side seal board material has enough thermal shock resistances, introduce a certain proportion of zirconium mullite material, to improve the thermal shock resistance of composite.
The critical granularity scope of side seal board of the present invention is 0.5-1.0mm.
The critical granularity of conventional aluminium zirconium material with carbon element is 3mm or 5mm.Result of the test shows: when the critical granularity of material of the present invention increases to 3mm, side seal board and crystallization roller end face abrasion index are 100%, when the critical granularity of material is reduced to 1mm, side seal board and crystallization roller end face frictional index are 53%, when the critical granularity of material was reduced to 0.5mm, side seal board and crystallization roller end face frictional index were 47%.
Because side seal board and continuous casting crystallization roller end face are a kind of dynamic seal (packing)s, for preventing side seal board friction crystallization roller end face, the critical granularity of composite should not be too big, and best critical granularity scope is 0.5-1.0mm.
Little for solving critical granularity, the technological problems that waits easy to crack during the compound moulding among the present invention carries out compound mixing granulation, the technological requirement of slabbing not when satisfying the side seal board moulding.
The manufacture method of the compound side seal board of aluminium zirconium carbon-boron nitride of the present invention comprises the steps,
A. earlier by said ratio with the ridge powder in boron nitride powder and the prescription: corundum, zirconium mullite, α-Al
2O
3Powder disperses to flood mixed processing in ethanol or ethylene glycol solution;
B. mixture obtains the boron nitride mixed powder of favorable dispersibility again through super-dry;
C. the aluminium oxide of size fractionated (corundum), zirconium mullite, zirconia, carbon raw and boron nitride mixed powder raw material and antioxidant are pressed proportioning premixed in screw mixer, and be standby as compound;
D. be bond with phenolic resins or pitch or other carbon containing binding agent, compound inserted carry out mixing granulation in the comminutor;
E. the compound of size fractionated after drying, compression molding; Wherein, the side seal board of forming burns till in reducing atmosphere after dry, and the side seal board after burning till carries out surface grinding and dimensioned after oil immersion heat treatment, the finished product vanning of dry back.
And, press the different use zone of side seal board, proportioning is divided into friction zone and non-friction zone.Boron nitride addition in friction zone in the compound side seal board material of aluminium zirconium carbon-boron nitride is 15%, and non-friction zone boron nitride addition is 5%.
Boron nitride is the covalent bond compound, does not have tangible fusing point.It is not only the good conductor of heat, still the insulator of electricity.Boron nitride material has a very valuable performance, and it can be machined, and precision reaches one of percentage millimeter, and this is rare in nonmetallic materials.In aluminium zirconium material with carbon element, add boron nitride, improved the mechanical behavior under high temperature and the machining property of material.Because the boron nitride powder is very easily reunited, the difficult dispersion, normal pressure-sinteredly also be difficult to densification under normal temperature condition.
Beneficial effect of the present invention: the present invention directly uses boron nitride in premixed mode, and it is considered as carbon raw as graphite, uses boron nitride from the angle of carbon composite refractory, is used for making device such as side seal board etc.Compound side seal board intensity is moderate, adapt with the friction of crystallization roller, and simplifies the using method of boron nitride material, overcome the boron nitride powder and very easily reunited under normal temperature condition, the difficult dispersion, normal pressure-sinteredly also is difficult to a fine and close difficult problem.And by compound is carried out mixing granulation, it is little to have solved the composite critical granularity, the technological problems that waits easy to crack during the compound moulding, the technological requirement of slabbing not when having satisfied the side seal board moulding; In addition, make good thermal shock stability, material hardness is moderate, refractory steel aggressivity is good.
Description of drawings
The schematic diagram of Fig. 1 side seal board material critical granularity and abrasion index.
The specific embodiment
The proportioning of specific embodiment sees Table 1.
Press ratio requirement earlier with boron nitride powder and powdery corundum or α-Al
2O
3Powder disperses impregnation process in ethanol or ethylene glycol solution; After 50-70 ℃ of drying, obtain the boron nitride powder of favorable dispersibility again through drying bed, standby; , standby by proportioning as compound with aluminium oxide (corundum), zirconium mullite, zirconia raw material, carbon raw and the boron nitride raw of size fractionated and antioxidant in screw mixer premixed 5-15 minute; With phenolic resins or pitch or other carbon containing binding agent is bond, addition 10%; Compound and bond inserted to grind in the mud comminutor carried out mixing granulation 10-20 minute; Behind the compound Sleepy of the size fractionated material, dry through being lower than under 110 ℃ of temperature again, press with machine in pack into mould or the die sleeve or etc. the moulding of static pressure mode, briquetting pressure is 150-200Mpa; The side seal board of forming in reducing atmosphere in the 1200-1400 ℃ of side seal board after burning till, burning till after oil immersion heat treatment, carry out surface grinding, the finished product vanning of dry back.
Table 1
| Component (percentage by weight) | |||||||
| Corundum | Zirconium mullite | α-Al 2O 3Micro mist | Carbon materials | Hexagonal boron nitride | Metallic silicon power | Phenolic resins | |
| Embodiment 1 | 50％ | 25％ | 10％ | 10％ | 5％ | 5％ | 10％ |
| Embodiment 2 | 55％ | 15％ | 10％ | 10％ | 10％ | 5％ | 10％ |
| Embodiment 3 | 60％ | 15％ | 5％ | 5％ | 15％ | 5％ | 10％ |
The side seal board material index of manufacturing by said ratio sees Table 2:
Table 2
| Embodiment 1 | Embodiment 2 | Embodiment 3 | ||||
| Physical index | Normal temperature | Hot 1400 ℃ of * 0.5 hour | Normal temperature | Hot 1400 ℃ of * 0.5 hour | Normal temperature | Hot 1400 ℃ of * 0.5 hour |
| Rupture strength, MPa | 13.6 | 9.2 | 12.0 | 7.5 | 12.6 | 8.0 |
| Compressive resistance, MPa | 70 | 70 | 70 | |||
| Abrasion index, % | 52％ (400℃) | 48％ (400℃) | 47％ (400℃) | |||
The technological difficulties of directly using boron nitride powder raw material are technical problems such as the dispersed difficulty that solves the boron nitride powder, densified sintering product difficulty.The present invention is with boron nitride powder and powdery corundum or α-Al
2O
3Powder together disperses impregnation process by the material mixture ratio requirement in ethanol or ethylene glycol solution, obtain the boron nitride powder of favorable dispersibility again after 50-70 ℃ of drying through drying bed.Change the use theory of boron nitride material among the present invention, it is treated as the graphite in the alumina-carbon material, as replenishing of graphite.
Claims (6)
1. compound side seal board of aluminium zirconium carbon-boron nitride, its weight percentages of components is:
Corundum 40-70%
Zirconium mullite 15-30%
α-Al
2O
3Micro mist 5-10%
Carbon materials 3-12%
Hexagonal boron nitride 5-15%
Metallic silicon power adds 2-5%
Binding agent adds 5-15%
Antioxidant adds 1-5%.
2. the compound side seal board of aluminium zirconium carbon-boron nitride as claimed in claim 1 is characterized in that its weight percentages of components is:
Corundum 50-60%
Zirconium mullite 10-20%
α-Al
2O
3Micro mist 5-10%
Carbon materials 5-10%
Hexagonal boron nitride 6-15%
Metallic silicon power adds 2-5%
Binding agent adds 5-15%
Antioxidant adds 1-5%.
3. the compound side seal board of aluminium zirconium carbon-boron nitride as claimed in claim 1 or 2 is characterized in that described binding agent is phenolic resins or pitch.
4. the compound side seal board of aluminium zirconium carbon-boron nitride as claimed in claim 1 is characterized in that, described antioxidant is one or more the combination in metallic aluminium powder, carborundum and the boron carbide.
5. the compound side seal board of aluminium zirconium carbon-boron nitride as claimed in claim 1 is characterized in that wherein the ratio of corundum and zirconium mullite is 2: 1～4: 1.
6. the compound side seal board of aluminium zirconium carbon-boron nitride as claimed in claim 1 is characterized in that the critical granularity scope of side seal board is 0.5-1.0mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03150584 CN1283394C (en) | 2003-08-27 | 2003-08-27 | Aluminium zirconium carbon-boron nitride composite lateral sealing plate and its manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03150584 CN1283394C (en) | 2003-08-27 | 2003-08-27 | Aluminium zirconium carbon-boron nitride composite lateral sealing plate and its manufacturing method |
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| Publication Number | Publication Date |
|---|---|
| CN1589991A CN1589991A (en) | 2005-03-09 |
| CN1283394C true CN1283394C (en) | 2006-11-08 |
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| CN 03150584 Expired - Fee Related CN1283394C (en) | 2003-08-27 | 2003-08-27 | Aluminium zirconium carbon-boron nitride composite lateral sealing plate and its manufacturing method |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102161082B (en) * | 2010-02-23 | 2013-10-30 | 上海柯瑞冶金炉料有限公司 | Side sealing plate for thin-belt continuous casting and manufacturing method |
| CN103073314B (en) * | 2013-02-17 | 2015-05-13 | 濮阳濮耐高温材料（集团）股份有限公司 | Preparation method for carbon composite refractory and product prepared by preparation method |
| CN104876556B (en) * | 2015-05-14 | 2017-05-24 | 武汉钢铁(集团)公司 | Manufacturing method of mullite-boron nitride composite ceramic side sealing plate for thin-strip continuous casting |
| CN108840684A (en) * | 2018-09-25 | 2018-11-20 | 阳谷信民耐火材料有限公司 | A kind of zirconium mullite boron nitride carbon side seal board and manufacturing method |
| CN114230316A (en) * | 2021-12-28 | 2022-03-25 | 河南华宇新材料有限公司 | Composite material for blast furnace lining and preparation method thereof |
| CN116854476B (en) * | 2023-07-17 | 2024-08-06 | 中钢集团洛阳耐火材料研究院有限公司 | Titanium carbide aluminum-based ceramic side sealing plate for thin strip continuous casting and preparation method thereof |
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Owner name: BAOSHAN IRON AND STEEL GROUP CO.; BAOSHAN IRON & S Free format text: FORMER NAME OR ADDRESS: SHANGHAI BAO STEEL GROUP IRON AND STEEL CO LTD; BAOSHAN IRON + STEEL CO., LTD. |
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Address after: 200122 No. 370 Pu circuit, Shanghai, Pudong New Area Co-patentee after: Baoshan Iron & Steel Co., Ltd. Patentee after: Baosteel Group Corporation Address before: 200122 No. 370 Pu circuit, Shanghai, Pudong New Area Co-patentee before: Baoshan Iron & Steel Co., Ltd. Patentee before: Baoshan Iron and Steel Group Co., Shanghai |
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Granted publication date: 20061108 Termination date: 20130827 |