Preparation method of graphene ceramic membrane for metallurgy nozzle

A technology of ceramic membrane and graphene, which is applied in the field of preparation of graphene ceramic membrane, can solve the problems of no innovation in the principle of thermal shock resistance, failure to improve the working life of the nozzle, and prolong 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 ...

Method used

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  • Preparation method of graphene ceramic membrane for metallurgy nozzle

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Comparison scheme
Effect test

Embodiment 1

[0033] The preparation method of the graphene ceramic membrane that the present embodiment provides for shroud comprises the following steps:

[0034] (1) First prepare the heat conduction layer: mix graphite powder, graphene powder, and binder methylcellulose according to the mass ratio of 1:0.03:0.1, and then add water whose mass is 1.5 times the sum of the three, Use an ultrasonic disperser to uniformly disperse all raw materials in water, and then evenly coat the working surface of the long nozzle with a coating thickness of 50 microns; dry at 180°C after coating; the graphite powder, graphene powder All are commercially available industrial-grade products, which are respectively passed through a 200-mesh sieve before mixing.

[0035] (2) Then prepare the ceramic film protective layer: Al 2 o 3 : 40 parts; SiN 4 : 7 parts; TiC: 3 parts; WC: 3 parts; binder methylcellulose: 5 parts; lubricant corn oil: 1 part; dispersant triethanolamine: 1 part; On the heat conduction l...

Embodiment 2

[0039] The preparation method of the graphene ceramic membrane that the present embodiment provides for shroud comprises the following steps:

[0040] (1) First prepare the heat conduction layer: mix graphite powder, graphene powder, and binder hydroxypropyl methylcellulose in a mass ratio of 1:0.05:0.15, and then add twice the sum of the three using an ultrasonic disperser to uniformly 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; the graphite powder, graphite The alkene powders are all commercially available industrial grade products, which are respectively passed through a 400-mesh sieve before mixing.

[0041] (2) Then prepare the ceramic film protective layer: Al 2 o 3 : 45 parts; SiN 4 : 8 parts; TiC: 4 parts; WC: 4 parts; binder hydroxypropyl methylcellulose: 7 parts; lubricant liquid paraffin: 2 parts; dispersant polypropylene: 2 parts; water: 28 pa...

Embodiment 3

[0045] The preparation method of the graphene ceramic membrane that the present embodiment provides for submerged nozzle comprises the following steps:

[0046] (1) First prepare the thermal conductive layer: mix graphite powder, graphene powder, and binder hydroxypropyl methylcellulose at a mass ratio of 1:0.08:0.2, and then add 3 times the sum of the three Use an ultrasonic disperser to uniformly disperse all the raw materials in water, and then evenly coat the working surface of the submerged nozzle with a coating thickness of 30 microns; dry at 160°C after coating; the graphite powder, The graphene powders are all commercially available industrial grade products, and are passed through a 300-mesh sieve before mixing.

[0047] (2) Then prepare the ceramic film protective layer: Al 2 o 3 : 50 parts; SiN 4 : 10 parts; TiC: 5 parts; WC: 5 parts; binder hydroxypropyl methylcellulose: 10 parts; lubricant liquid paraffin: 3 parts; dispersant polyethylene glycol: 3 parts; water...

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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 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, evenly mixing Al2O3, SiN4, TiC, WC, a binder, a lubricant, a dispersant and water, and 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 utilized to 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 andfirmness 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 ceramic film used for metallurgical 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...

Claims

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Application Information

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IPC IPC(8): C04B41/89C03C8/00B22D41/54
Inventor 吴建湘吴佩霞薛文东
Owner JIANGSU TAIRUI REFRACTORY
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