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Preparation method of nozzle graphene refractory material

A technology of ene refractory material and graphene powder, which is applied in the field of preparation of graphene refractory material, can solve problems such as the inability to increase the working life of the nozzle, the lack of innovation in the principle of thermal shock resistance, and the prolongation of the thermal shock resistance time.

Active Publication Date: 2019-06-25
JIANGSU TAIRUI REFRACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] 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 graphene refractory material

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Effect test

Embodiment 1

[0035] The preparation method of the graphene refractory material that the present embodiment provides for shroud comprises the following steps:

[0036] (1) First prepare the heat conducting layer: mix 100 parts of graphite powder, 5 parts of graphene powder, 10 parts of titanium carbide, 7 parts of tungsten carbide, and 15 parts of binder methyl cellulose, and then add the above raw materials 2 times the sum of water, use an ultrasonic disperser to evenly disperse all raw materials in water, and then evenly coat the working surface of the long nozzle with a coating thickness of 20 microns; dry at 150°C after coating; graphite powder Body and graphene powder were passed through a 300 mesh sieve before mixing.

[0037] (2) Then prepare the ceramic film protective layer: Al 2 o 3 : 40 parts; SiN 4 : 10 parts; Binder methylcellulose: 3 parts; Lubricant liquid paraffin: 0.5 part; Dispersant terpineol: 0.5 part; Water: 15 parts Mix evenly and apply to the heat conducting layer ...

Embodiment 2

[0041] The preparation method of the graphene refractory material that the present embodiment provides for shroud comprises the following steps:

[0042] (1) First prepare the heat conduction layer: mix 100 parts of graphite powder, 6 parts of graphene powder, 11 parts of titanium carbide, 8 parts of tungsten carbide, and 18 parts of binder hydroxypropyl methylcellulose, and then add mass Water that is 2.5 times the sum of the above raw materials, use an ultrasonic disperser to evenly disperse all the raw materials in water, and then evenly coat the working surface of the long nozzle with a coating thickness of 50 microns; dry at 160°C after coating ; The graphite powder and the graphene powder are respectively passed through a 200-mesh sieve before mixing.

[0043] (2) Then prepare the ceramic film protective layer: Al 2 o 3 : 45 parts; SiN 4 : 12 parts; binder hydroxypropyl methylcellulose: 4 parts; lubricant corn oil: 0.8 part; dispersant triethanolamine: 1 part; On the...

Embodiment 3

[0047] The preparation method for the graphene refractory material that the present embodiment provides for submerged nozzle comprises the following steps:

[0048] (1) First prepare the heat conducting layer: mix 100 parts of graphite powder, 7 parts of graphene powder, 12 parts of titanium carbide, 9 parts of tungsten carbide, and 20 parts of binder methyl cellulose, and then add one of the above raw materials and 3 times of water, use an ultrasonic disperser to evenly disperse all raw materials in water, and then evenly coat on the working surface of the submerged nozzle with a coating thickness of 30 microns; dry at 180°C after coating; graphite powder Body and graphene powder were passed through a 200 mesh sieve before mixing.

[0049] (2) Then prepare the ceramic film protective layer: Al 2 o 3 : 50 parts; SiN 4 : 15 parts; binder hydroxypropyl methylcellulose: 5 parts; lubricant liquid paraffin: 1 part; dispersant terpineol: 2 parts; water: 20 parts, mixed evenly and...

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Abstract

The invention provides a preparation method of a nozzle graphene refractory material, and the preparation method comprises the following steps: (1) firstly preparing a heat conducting layer, namely, mixing graphite powder, graphene powder, titanium carbide, tungsten carbide and a binder, and uniformly coating the working surface of a long nozzle or a submerged nozzle with the mixture, (2) preparing a ceramic membrane protective layer, namely, uniformly mixing Al2O3, SiN4, a binder, a lubricant, a dispersant and water, and then coating a heat conducting layer prepared in the step (1) with the mixture; (3) performing low-temperature calcination; (4) performing high temperature calcination. According to the invention, the high thermal conductivity of the graphite and the graphene is utilizedto rapidly disperse the thermal shock of molten steel to the whole long nozzle or submerged nozzle body, so that the heat accumulation in a local area of the nozzle is avoided, and each part of the nozzle can maintain the stability and firmness of the internal structure without the appearance of weak areas, and the working time of the nozzle as a whole is improved.

Description

technical field [0001] The invention relates to the technical field of functional refractory materials, in particular to a method for preparing a graphene refractory material used in nozzles. Background technique [0002] Functional refractory components such as integral stopper, long nozzle (large ladle long nozzle), submerged nozzle (tundish nozzle), and tundish nozzle are collectively referred to as the three major components of continuous casting. The main materials are aluminum carbon, aluminum zirconium carbon, magnesium carbon or magnesium aluminum spinel carbon, and the molding method is isostatic pressing. [0003] Among them, the long nozzle means that when the molten steel is poured from the ladle to the tundish, in order to avoid oxidation and splashing, a long nozzle is installed at the lower end of the sliding nozzle at the bottom of the ladle, one end is connected with the lower nozzle, and the other end is inserted into the molten steel in the tundish for sea...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/622C04B35/528B22D41/54C03C8/00C04B41/86
Inventor 吴建湘吴佩霞薛文东
Owner JIANGSU TAIRUI REFRACTORY
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