CN111957945B - Long nozzle sealing gasket - Google Patents

Long nozzle sealing gasket Download PDF

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Publication number
CN111957945B
CN111957945B CN201910419587.2A CN201910419587A CN111957945B CN 111957945 B CN111957945 B CN 111957945B CN 201910419587 A CN201910419587 A CN 201910419587A CN 111957945 B CN111957945 B CN 111957945B
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CN
China
Prior art keywords
granularity
sealing gasket
long nozzle
brown corundum
nozzle sealing
Prior art date
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Active
Application number
CN201910419587.2A
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Chinese (zh)
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CN111957945A (en
Inventor
于燕文
蒋永献
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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Application filed by Baoshan Iron and Steel Co Ltd filed Critical Baoshan Iron and Steel Co Ltd
Priority to CN201910419587.2A priority Critical patent/CN111957945B/en
Publication of CN111957945A publication Critical patent/CN111957945A/en
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Publication of CN111957945B publication Critical patent/CN111957945B/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50Pouring-nozzles
    • B22D41/502Connection arrangements; Sealing means therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50Pouring-nozzles
    • B22D41/52Manufacturing or repairing thereof
    • B22D41/54Manufacturing or repairing thereof characterised by the materials used therefor

Abstract

The invention discloses a long nozzle sealing gasket, which is prepared by mixing the following components in percentage by weight: brown corundum particles with the granularity of 0.1-1 mm: 25-35%; fine brown corundum powder with the granularity of not more than 0.088 mm: 15-30%; alpha-alumina with the particle size of 4-9 μm: 20-25%; alumina sol with particle size of 10-20 nm: 16-20%; mica powder with the granularity of 40-50 mu m: 2-7%; silicone resin: 2-4%. The long nozzle sealing gasket has low porosity and effectively isolates air.

Description

Long nozzle sealing gasket
Technical Field
The invention relates to continuous casting equipment, in particular to a sealing gasket for a long nozzle of a ladle.
Background
Aiming at the fact that an important element for a continuous casting machine to receive molten steel is the connection matching position of a ladle down nozzle and a long nozzle, the currently adopted sealing gasket material is aluminum silicate fiber, the material is hard and easy to damage, partial sealing is not tight during casting, a large number of compressible through air holes exist, argon can be sucked into air to enter a tundish along with the molten steel, secondary oxidation of the molten steel is caused, steel quality is affected, and castability of the molten steel is reduced.
Disclosure of Invention
In order to solve the problems, the invention provides a long nozzle sealing gasket which can effectively isolate air.
In order to realize the purpose, the long nozzle sealing gasket is prepared by mixing the following components in percentage by weight: brown corundum particles with the granularity of 0.1-1 mm: 25-35%; fine brown corundum powder with the granularity of not more than 0.088 mm: 15-30%; alpha-alumina micropowder with the granularity of 4-9 μm: 20-25%; alumina sol with particle size of 10-20 nm: 16-20%; mica powder with the granularity of 40-50 mu m: 2-7%; silicone resin: 2-4%.
Preferably, the components are mixed and then pressed in a mould.
The long nozzle sealing gasket has low porosity, effectively isolates air, can greatly reduce the replacement times of the long nozzle, and obviously reduces the probability of oxides entering molten steel.
Detailed Description
The long nozzle sealing gasket is prepared by mixing the following components in percentage by weight:
brown corundum particles with the granularity of 0.1-1 mm: 25-35%;
fine brown corundum powder with the granularity of not more than 0.088 mm: 15-30%;
alpha-alumina micropowder with the granularity of 4-9 μm: 20-25%;
alumina sol with particle size of 10-20 nm: 16-20%;
mica powder with the granularity of 40-50 mu m: 2-7%;
silicone resin: 2-4%.
The components are mixed and then pressed and formed in a mould.
The alumina sol is in a feather shape with positive charges, and alumina colloidal particles are dispersed in the organic silicon resin liquid to form a colloidal solution which is used as a binding agent. Since the colloidal particles are as fine as 10 to 20nm, dispersibility and permeability are excellent when they are mixed with other substances. When the water content of the sol is evaporated when the temperature is increased, the colloid particles are firmly attached to the surface of an object, and aluminum oxide bonding is formed among the particles, so that the bonding strength of the material is greatly improved. The particle size of the brown corundum particles is 0.1-1 mm, gaps with different sizes formed among the particles are filled with brown corundum fine powder with the particle size of not more than 0.088mm, alpha-alumina micro powder with the particle size of 4-9 mu m and mica powder with the particle size of 40-50 mu m, and the bonding agent is formed into a closest-packed material by premixing nano-scale alumina sol and organic silicon resin. The mica powder belongs to monoclinic crystals, the crystals are scaly, the surface modification effect can be realized, the sintering temperature of the sealing gasket can be reduced, and the porosity is further reduced through the sintering of the sealing gasket. Therefore, the gasket of the present invention has few gas passages and hardly sucks air.
The following table shows three preferred embodiments of the gasket of the invention
Material composition Example 1 Example 2 Example 3
Brown corundum granule 35% 30% 26%
Fine brown corundum powder 15% 22% 28%
Alpha-alumina micropowder 25% 22% 20%
Alumina sol 16% 18% 20%
Mica powder 6.5% 5% 2%
Silicone resin 2.5% 3% 4%
The gasket manufactured in the above example was used at a temperature of 1750 ℃ or higher. By adopting the sealing gasket prepared in the embodiment 1, the porosity is less than 0.5 percent through tests; by adopting the sealing gasket prepared in the embodiment 2, the porosity is less than 0.4% through tests; the gasket made in example 3 was tested to have a porosity of less than 0.3%. The sealing gasket of the invention has about 4 tons of acting force in the actual use process, and can eliminate part of air hole channels of the sealing material again, so that few air channels exist, air is hardly sucked, and the sealing material has the effect of isolating air.
According to the sealing gasket, the high-molecular organic bonding agent is used for filling the nano alumina sol, so that the porosity of the material is reduced; the high temperature resistance, the oxidation resistance and the strength are obviously improved, particularly, the heat conductivity coefficient is further reduced because the material does not contain carbon, and the method plays an important role in preventing the bowl mouth from being cooled due to gap junction. Tests show that the cleaning of the long nozzle can be avoided within 5 continuous casting furnaces of the tundish, so that the replacement times of the long nozzle can be greatly reduced, and the probability of oxides entering steel night is also obviously reduced.
It should be understood that the invention is not intended to be limited to these specific details. Equivalent or similar changes in the structure and features of the exemplary embodiments may be made without departing from the spirit and scope of the invention, which shall also fall within the scope of the protection defined by the claims appended hereto.

Claims (2)

1. The long nozzle sealing gasket is characterized by being prepared by mixing the following components in percentage by weight:
brown corundum particles with the granularity of 0.1-1 mm: 25-35%;
fine brown corundum powder with the granularity of not more than 0.088 mm: 15-30%;
alpha-alumina micropowder with the granularity of 4-9 μm: 20-25%;
alumina sol with particle size of 10-20 nm: 16-20%;
mica powder with the granularity of 40-50 mu m: 2-7%;
silicone resin: 2-4%.
2. The long nozzle seal of claim 1, wherein the components are mixed and then press-formed in a mold.
CN201910419587.2A 2019-05-20 2019-05-20 Long nozzle sealing gasket Active CN111957945B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910419587.2A CN111957945B (en) 2019-05-20 2019-05-20 Long nozzle sealing gasket

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910419587.2A CN111957945B (en) 2019-05-20 2019-05-20 Long nozzle sealing gasket

Publications (2)

Publication Number Publication Date
CN111957945A CN111957945A (en) 2020-11-20
CN111957945B true CN111957945B (en) 2022-01-14

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ID=73358403

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910419587.2A Active CN111957945B (en) 2019-05-20 2019-05-20 Long nozzle sealing gasket

Country Status (1)

Country Link
CN (1) CN111957945B (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999057077A1 (en) * 1998-05-05 1999-11-11 Didier-Werke Ag Ceramic composite body
CN102699317A (en) * 2012-04-19 2012-10-03 济南麦哈勃冶金技术开发有限公司 Combined elongated upper nozzle and manufacturing method for same
CN102731118B (en) * 2012-07-04 2014-01-15 武汉科技大学 Corundum micro-pore heat-insulating and fireproof material and preparation method thereof
CN107043247A (en) * 2017-04-27 2017-08-15 无锡市南方耐材有限公司 A kind of high temperature paste sealing mat and preparation method thereof
CN108637236A (en) * 2018-05-14 2018-10-12 南京钢铁股份有限公司 A kind of long nozzle sealing ring
CN109251042A (en) * 2017-07-12 2019-01-22 上海宝钢工业技术服务有限公司 Flexible self-expanding heatproof sealing element and preparation method thereof for continuous casting long gate

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999057077A1 (en) * 1998-05-05 1999-11-11 Didier-Werke Ag Ceramic composite body
CN102699317A (en) * 2012-04-19 2012-10-03 济南麦哈勃冶金技术开发有限公司 Combined elongated upper nozzle and manufacturing method for same
CN102731118B (en) * 2012-07-04 2014-01-15 武汉科技大学 Corundum micro-pore heat-insulating and fireproof material and preparation method thereof
CN107043247A (en) * 2017-04-27 2017-08-15 无锡市南方耐材有限公司 A kind of high temperature paste sealing mat and preparation method thereof
CN109251042A (en) * 2017-07-12 2019-01-22 上海宝钢工业技术服务有限公司 Flexible self-expanding heatproof sealing element and preparation method thereof for continuous casting long gate
CN108637236A (en) * 2018-05-14 2018-10-12 南京钢铁股份有限公司 A kind of long nozzle sealing ring

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