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High-strength long-life stopper rod and preparation method thereof

A high-strength, plug-rod technology, used in the field of refractory products, can solve the problems of low strength and short service life of plug-rods, and achieve the effect of enhancing flexural and pressure resistance and improving thermal shock stability.

Active Publication Date: 2019-12-06
山东铭特陶瓷材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the technical problems of low strength and short service life of existing stopper rods, the present invention provides a high-strength, long-life stopper rod and its preparation method, the flexural strength of the stopper rod can be increased from 6-10MPa of the existing stopper rod to 15-23MPa , the compressive strength can be increased from 30-40MPa of the existing stopper to more than 60MPa, and the service life can be extended by 3-5 hours

Method used

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  • High-strength long-life stopper rod and preparation method thereof
  • High-strength long-life stopper rod and preparation method thereof
  • High-strength long-life stopper rod and preparation method thereof

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preparation example Construction

[0032] The preparation method of stopper rod comprises the following steps:

[0033] (1) Add the white corundum, magnesium-aluminum alloy powder, graphite, antioxidant and liquid resin weighed in proportion to the mixer, and stir for 20 minutes to obtain the sludge;

[0034] (2) After drying the stirred mud material for 25 minutes, put it into an airtight container to trap the material;

[0035] (3) Fill the trapped mud into the rubber mould;

[0036] (4) rubber mold is put into the cold isostatic pressing machine, through 80MPa pressure molding, obtain semi-finished product;

[0037] (5) Put the formed semi-finished product into a drying kiln, and dry and solidify at 250°C;

[0038] (6) process the semi-finished product after drying to a regular shape with a lathe and apply one deck of anti-oxidation coating;

[0039] (7) After the paint is completely dry, put the product into a kiln for firing at 1200°C and keep it warm for 10 hours to obtain a finished stopper.

[0040]...

Embodiment 1

[0062] Embodiment 1 A kind of high-strength, high-life stopper rod

[0063] The raw materials of the stopper include 27.5 parts of 36 mesh white corundum, 25 parts of 80 mesh white corundum, 35 parts of 320 mesh white corundum, 7.5 parts of 200 mesh magnesium aluminum alloy powder (magnesium powder: aluminum powder = 1:1), 15 parts of graphite, antioxidant carbonization 4 parts of boron and 12 parts of liquid phenolic resin;

[0064] The preparation method of above-mentioned stopper rod comprises the following steps:

[0065] (1) Add the white corundum, magnesium-aluminum alloy powder, graphite, antioxidant and liquid resin weighed in proportion to the mixer, and stir for 20 minutes to obtain the sludge;

[0066] (2) After drying the stirred mud material for 25 minutes, put it into an airtight container to trap the material;

[0067] (3) Fill the trapped mud into the rubber mould;

[0068] (4) rubber mold is put into the cold isostatic pressing machine, through 80MPa pressu...

Embodiment 2

[0073] Embodiment 2 A kind of high-strength, high-life stopper rod

[0074] The raw materials of the stopper include 22 parts of 36 mesh white corundum, 16 parts of 80 mesh white corundum, 28 parts of 320 mesh white corundum, 6 parts of 200 mesh magnesium aluminum alloy powder (magnesium powder: aluminum powder = 1:1), 17 parts of graphite, antioxidant carbonization 3.5 parts of boron and 14 parts of liquid phenolic resin;

[0075] The preparation method of above-mentioned stopper rod comprises the following steps:

[0076] (1) Add white corundum, magnesium-aluminum alloy powder, graphite, antioxidant and liquid resin weighed in proportion to the mixer, and stir for 25 minutes to obtain mud;

[0077] (2) After drying the stirred mud material for 30 minutes, put it into an airtight container to trap the material;

[0078] (3) Fill the trapped mud into the rubber mould;

[0079] (4) rubber mold is put into cold isostatic pressing machine, through 100MPa pressure molding, obta...

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Abstract

The invention relates to the technical field of refractory material products, in particular to a high-strength long-life stopper rod and a preparation method thereof. The raw materials of the stopperrod include white corundum, magnesium-aluminum alloy powder, graphite, an antioxidant and liquid resin, and the preparation method includes the following steps: (1) weighing the raw materials, and performing stirring so as to obtain mud; (2) drying the mud, and putting the dried mud in a closed container for curing; (3) putting the cured mud into a rubber mold; (4) performing pressure forming so as to obtain a semi-finished product; (5) putting the semi-finished product obtained after forming into a drying kiln, and performing drying and solidification; (6) processing the dried semi-finished product into a regular shape by using a lathe, and then coating an anti-oxidation coating layer on the processed semi-finished product; and (7) putting the product into a firing kiln after complete drying of the coating, and performing heat preservation so as to obtain the finished product stopper rod. The stopper rod has bending strength of 15-23 MPa and compressive strength of 60 MPa or above, and the service life can be prolonged by 3-5 hours.

Description

technical field [0001] The invention relates to the technical field of refractory products, in particular to a high-strength, long-life stopper rod and a preparation method thereof. Background technique [0002] Stopper rod refers to the refractory material rod that is installed in the steel ladle to control the opening and closing of the nozzle and the flow rate of molten steel by lifting displacement during the continuous casting process of molten steel. [0003] In recent years, with the acceleration of molten steel smelting in steel mills and the increasingly strict control of smelting costs, the performance requirements for stoppers are also getting higher and higher. However, due to the low flexural strength and compressive strength of existing stopper rods, the phenomenon of stopper rod control runaway often occurs in actual production, seriously affecting the continuous casting process of billets, and cannot meet the current use requirements. [0004] Based on this,...

Claims

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Application Information

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IPC IPC(8): C04B35/103C04B35/622C04B35/66C04B35/634C04B35/64B22D41/18
CPCC04B35/103C04B35/622C04B35/63476C04B35/64B22D41/18C04B2235/40C04B2235/425C04B2235/402C04B2235/3821C04B2235/616C04B2235/36C04B2235/349C04B2235/3418C04B2235/9607C04B2235/656C04B2235/6567C04B2235/96
Inventor 蔡伟殷若光孙华云李明京蔡衍坤殷佩如
Owner 山东铭特陶瓷材料有限公司
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