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Preparation method of nozzle nano refractory material

A refractory material and nozzle technology, which is applied in the field of nozzle nano refractory material preparation, can solve the problems of inability to increase the working life of the nozzle, no innovation in the thermal shock resistance principle, and prolonged thermal shock resistance time, etc., and achieves high hardness, tight adhesion, and prolonged Effect of impact resistance time

Active Publication Date: 2019-05-28
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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  • Preparation method of nozzle nano refractory material

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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; SiN 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 meth...

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; SiN 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 PS: 1...

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; SiN 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 hydroxy...

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Abstract

The invention provides a preparation method of a nozzle nano refractory material. The preparation method comprises the following steps that (1) a nano-film layer is prepared firstly, specifically, nano-alumina, nano-silicon micro powder and nano silicon carbide are mixed evenly, and the particle sizes of the three nano raw materials are 200-500 nm; (2) a binder with the weight being 3-5% of the sum of the three raw materials and water with the weight being 20-30% of the sum of the three raw materials are added, mixed evenly and then smeared on the working surface of a long nozzle or a submerged nozzle, the smearing thickness is 30-50 microns, drying is conducted at 150-180 DEG C, and thus the long nozzle or the submerged nozzle covered with a nano film layer is obtained; and (3) then a ceramic film layer is prepared. A double-film-layer structure formed by the nano-film layer prepared through the preparation method and the ceramic film layer in an overlaid mode can absorb thermal impact and provides thermal shock buffering for a nozzle body, a ceramic film falls off after the nozzle body works for 5-7 hours, the fallen-off ceramic film is replaced with a new ceramic film for the nozzle body to continue working, and the working life is prolonged 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 for 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 structur...

Claims

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Application Information

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Patent Type & Authority Applications(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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