Glaze-crawling-proof protection coating for immersion type water gap slag line and preparation method of glaze-crawling-proof protection coating

A protective coating and immersion technology, which is applied in the field of anti-shrinkage glaze protective coating for slag line of immersion nozzle and its preparation, which can solve the problems of poor adhesion of anti-oxidation coating, no strength of slag line, large difference in thermal expansion, etc. , to achieve the effect of enhancing the anti-shrinkage glaze, not easy to fall off and wear, and good plasticity

Active Publication Date: 2016-06-22
HENAN XIBAO METALLURGICAL MATERIALS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to prevent the reduction of service life caused by carbon oxidation, various refractory manufacturers spray anti-oxidation coatings on the surface of the nozzle, but the biggest disadvantage of ordinary anti-oxidation coatings is the high-temperature baking shrinkage glaze, especially the zirconia slag line, the adhesion of anti-oxidation coatings Poor, high-temperature baking zirconia material and aluminum carbon material have a large difference in thermal expansion, glaze shrinkage is particularly serious, there is no protective carbon in the slag line part to oxidize rapidly, the slag line part forms a honeycomb loose shape and has no strength, and is melted by molten steel in a short time Erosion through, the life is greatly reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] An anti-shrinkage glaze protective coating for submerged nozzle slag line, made of main material, water and white dextrin, the main material components are as follows by weight percentage: tabular corundum 62%, Suzhou clay 17%, bentonite 5%, activated alumina 15%, water glass 1%, wherein the weight ratio of water, white dextrin and main material is 31:0.6:100.

[0024] Among them, the particle size of tabular alumina is 200 mesh, the particle size of activated alumina is 3-5 μm, the particle size of Suzhou clay is 180 mesh, and the particle size of bentonite is 180 mesh.

[0025] The preparation method of the anti-shrinkage glaze protective coating for the slag line of the submerged nozzle comprises the following steps: mixing the main material, water and white dextrin, placing them in a planetary ball mill for ball milling for 2 hours, the ball-to-material ratio is 2:1, and then The slurry after ball milling is sprayed on the outside of the anti-oxidation coating on th...

Embodiment 2

[0030] An anti-shrinkage glaze protective coating for submerged nozzle slag line, made of main material, water and yellow dextrin, the main material components are as follows by weight percentage: tabular corundum 64.5%, Suzhou clay 16%, bentonite 3%, activated alumina 16%, water glass 0.5%, wherein the weight ratio of water, yellow dextrin and main ingredients is 32:0.6:100.

[0031] Among them, the particle size of tabular alumina is 325 mesh, that of activated alumina is 3-5 μm, that of Suzhou clay is 200 mesh, and that of bentonite is 325 mesh.

[0032] The preparation method of the anti-shrinkage glaze protective coating for the slag line of the submerged nozzle comprises the following steps: after mixing the main material, water and yellow dextrin, they are placed in a planetary ball mill for ball milling for 3 hours, the ball-to-material ratio is 2:1, and then The slurry after ball milling is sprayed on the outside of the anti-oxidation coating on the slag line of the s...

Embodiment 3

[0037] An anti-shrinkage glaze protective coating for submerged nozzle slag line, made of main materials, water and white dextrin, the main materials are as follows by weight percentage: tabular corundum 63%, Suzhou clay 17%, bentonite 5%, activated alumina 14%, water glass 1%, wherein the weight ratio of water, white dextrin and main material is 32:0.7:100.

[0038]Among them, the particle size of tabular alumina is 200 mesh, the particle size of activated alumina is 3-5 μm, the particle size of Suzhou clay is 325 mesh, and the particle size of bentonite is 300 mesh.

[0039] The preparation method of the anti-shrinkage glaze protective coating for the slag line of the submerged nozzle comprises the following steps: mixing the main material, water and white dextrin, placing them in a planetary ball mill for 2.5 hours, and ball-to-material ratio of 2:1, and then Spray the ball-milled slurry on the outside of the anti-oxidation coating on the slag line of the submerged nozzle w...

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Abstract

The invention discloses a glaze-crawling-proof protection coating for an immersion type water gap slag line and a preparation method of the glaze-crawling-proof protection coating. The coating is prepared from a main material, water and dextrin; the main material is prepared from the following components in percentage by weight: 62 percent to 66 percent of tabular corundum, 15 percent to 17 percent of Suzhou clay, 3 percent to 5 percent of bentonite, 12 percent to 16 percent of active aluminum oxide and 0.5 percent to 1 percent of sodium silicate; the weight ratio of the water to the dextrin to the main material is (31 to 33):(0.6 to 0.8):100. The glaze-crawling-proof protection coating disclosed by the invention can be used for effectively preventing an anti-oxidization coating of the immersion type water gap slag line part from generating glaze crawling, so that the strength and anti-corrosion performance of the immersion type water gap slag line are improved, and the service life of an immersion type water gap can be prolonged for 2.5 hours to 3.5 hours.

Description

technical field [0001] The invention relates to the technical field of steelmaking and continuous casting, in particular to an anti-shrinkage glaze protective coating for submerged nozzle slag lines and a preparation method thereof. Background technique [0002] In the continuous casting technology, in order to improve the quality of the slab, a submerged nozzle is provided between the tundish and the mold. Its main function is to prevent the secondary oxidation of the tundish injection flow and the splashing of molten steel; to avoid the mold slag from being involved. Liquid steel; improve the flow state and heat flow distribution of the injection in the crystallizer; and thus promote the uniform growth of the billet shell in the crystallizer, which is beneficial to the removal of gases and inclusions in the steel. The submerged nozzle has remarkable effects on improving the quality of the slab, improving the working conditions, stabilizing the continuous casting operation,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/89B22D41/54
CPCB22D41/54C04B41/009C04B41/52C04B41/89C04B35/48C04B41/5037C04B41/5024C04B41/50C04B41/5031C04B41/5096C04B41/5059C04B41/5025C04B41/4803
Inventor 杨英杰李伟锋李书成王英杰
Owner HENAN XIBAO METALLURGICAL MATERIALS GROUP
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