A preparation method of nano refractory material for nozzle

A technology of refractory materials and nozzles, which is applied in the field of nano-refractory preparation of nozzles, can solve the problems of no thermal shock resistance principle innovation, no improvement of nozzle working life, and prolonged thermal shock resistance time, etc., to achieve high hardness, tight adhesion, The effect of prolonging the impact resistance time

Active Publication Date: 2021-04-09
JIANGSU TAIRUI REFRACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The above two schemes lay a layer of smooth and dense glaze on the surface of the nozzle body, which is equivalent to strengthening the nozzle body and prolonging the thermal shock resistance time of the body. There is no innovation in the principle of thermal shock resistance, so it is impossible to The working life of the nozzle is significantly and effectively improved

Method used

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  • A preparation method of nano refractory material for nozzle

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The method for preparing nano-refractory material in this embodiment may further comprise the steps:

[0041] (1) Prepare the nano-film layer first: mix nano-alumina, nano-silicon micropowder, and nano-silicon carbide with a mass ratio of 1:0.2:0.1; the particle diameters of the three nano-materials are all 500 nanometers.

[0042] (2) add 3% binding agent and 20% water that the weight is the sum of these three kinds of raw materials, mix and coat on the working surface of long nozzle or submerged nozzle, coating thickness is 50 microns, at 180 Drying at ℃ to obtain a long nozzle or submerged nozzle covered with a nano-film layer.

[0043] (3) prepare ceramic film layer then: the weight of each raw material is:

[0044] al 2 o 3 : 50kg; SiC: 20kg; ZrO 2 : 5kg; Si 3 N 4 : 2kg;

[0045] Calcined kaolin: 5kg; talc: 3kg;

[0046] 6 micron small particle size pore forming agent PMMA: 10kg; 22 micron large particle size pore forming agent PMMA: 15kg;

[0047] Binder ...

Embodiment 2

[0052] The method for preparing nano-refractory material in this embodiment may further comprise the steps:

[0053] (1) Prepare the nano-film layer first: mix nano-alumina, nano-silicon micropowder, and nano-silicon carbide with a mass ratio of 1:0.3:0.3; the particle sizes of the three nano-materials are 200 nm, 300 nm, and 300 nm, respectively. .

[0054] (2) add 5% binding agent and 30% water that the weight is the sum of these three kinds of raw materials, mix and coat on the working surface of long nozzle or submerged nozzle, coating thickness is 40 microns, at 160 Drying at ℃ to obtain a long nozzle or submerged nozzle covered with a nano-film layer.

[0055] (3) prepare ceramic film layer then: the weight fraction of each raw material is:

[0056] al 2 o 3 : 50kg; SiC: 25kg; ZrO 2 : 6kg; Si 3 N 4 : 3kg;

[0057] Calcined kaolin: 6kg; talc: 4kg;

[0058] 5 micron small particle size pore forming agent PS: 12kg; 20 micron large particle size pore forming agent P...

Embodiment 3

[0064] The method for preparing nano-refractory material in this embodiment may further comprise the steps:

[0065] (1) Prepare the nano-film layer first: mix nano-alumina, nano-silicon micropowder, and nano-silicon carbide with a mass ratio of 1:0.2:0.3; the particle diameters of the three nano-materials are all 200 nanometers;

[0066] (2) add 4% binder and 25% water that the weight is the sum of these three raw materials, mix uniformly and apply on the working surface of the long nozzle or submerged nozzle, the coating thickness is 30 microns, at 150 Dry at ℃ to obtain a long nozzle or submerged nozzle covered with a nano-film layer;

[0067] (3) prepare ceramic film layer then: the weight fraction of each raw material is:

[0068] al 2 o 3 : 40kg; SiC: 30kg; ZrO 2 : 8kg; Si 3 N 4 : 4kg;

[0069] Calcined kaolin: 7kg; talc: 5kg;

[0070] 8 micron small particle size pore former toner: 15kg; 25 micron large particle size pore former toner: 20kg;

[0071] Binder hyd...

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Abstract

The invention provides a method for preparing a nano-refractory material for a nozzle, which includes the following steps: (1) preparing a nano-film layer first: mixing nano-alumina, nano-silicon powder, and nano-silicon carbide; the particles of the three nano-materials The diameters are 200-500 nanometers; (2) Add 3-5% binder and 20-30% water of the total weight of these three materials, mix evenly and apply it to the long nozzle or submerged nozzle. On the surface, the thickness of the coating is 30-50 microns, and it is dried at 150-180° C. to obtain a long nozzle or submerged nozzle covered with a nano-film layer; (3) and then prepare a ceramic film layer. The nano film layer and ceramic film layer superimposed double film structure prepared by the present invention can absorb thermal shock and provide thermal shock buffer for the nozzle body. After working for 5-7 hours, the ceramic film falls off, and the nozzle body is replaced with a new layer. The ceramic membrane continues to work, extending the working life to 20-25 hours.

Description

technical field [0001] The invention relates to the technical field of functional refractory materials, in particular to a method for preparing nanometer refractory materials used in nozzles. Background technique [0002] The rapid development of continuous casting technology has resulted in the corresponding development and improvement of related refractory materials in terms of variety and quality, and the development of continuous casting refractory materials has a significant impact on continuous casting production and continuous casting billet quality. The three major parts of continuous casting: integral stopper, long nozzle and submerged nozzle are the important parts of the tundish of the continuous casting unit. Prevent secondary oxidation of molten steel and realize continuous casting process. The manufacturing level of the three major parts of continuous casting, product service reliability, high performance of service life, functionalization, and reasonable stru...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/06C04B35/10C04B35/622C04B35/636C04B35/632C04B35/634C04B35/66
Inventor 吴建湘吴佩霞薛文东
Owner JIANGSU TAIRUI REFRACTORY
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