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Carbon raw material for carbon composite refractory material and preparation method thereof

A refractory and carbon composite technology is applied in the field of carbon raw materials and preparation of carbon composite refractories, which can solve the problems of limiting the application of graphene, easy to agglomerate, uniform dispersion, etc., and achieve excellent physical and chemical properties and retain carbon content. , good dispersion effect

Inactive Publication Date: 2014-07-16
WUHAN UNIV OF SCI & TECH
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Problems solved by technology

However, the theoretical specific surface area of ​​graphene is as high as 2620m 2 / g, it is easy to agglomerate without any treatment, and it is difficult to disperse evenly in the material, which ultimately limits the application of graphene in actual production.

Method used

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  • Carbon raw material for carbon composite refractory material and preparation method thereof

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[0022] The preparation method of the expanded graphite is as follows: firstly, the graphite oxide with a particle size greater than 0.038 mm and less than 0.2 mm is kept at 800 to 1250 ° C for 5 to 70 seconds to obtain prefabricated expanded graphite, and then the prefabricated expanded graphite is placed in urea or urea. In the boric acid aqueous solution, stir evenly, and filter to obtain the surface-modified expanded graphite; finally, the surface-modified expanded graphite is dried in an argon atmosphere at 400-1100° C. for 24 hours to obtain the expanded graphite.

[0023]The preparation method of the described graphene is: first place commercially available graphene in an aqueous solution of urea or boric acid, stir evenly, filter to obtain surface-modified graphene; then place the surface-modified graphene in an argon atmosphere Graphene was prepared by drying at 400~1100°C for 24 hours.

Embodiment 1

[0025] A carbon raw material for carbon composite refractories and a preparation method thereof. First, the elemental silicon powder is evenly filled at the bottom of the graphite crucible, and then the expanded graphite is evenly covered on the elemental silicon powder, and then kept in an argon atmosphere at 1000-1100 ℃ for 1-1.5 hours, and the silicon powder covered on the elemental silicon powder is taken out. material to obtain carbon raw materials for carbon composite refractories.

[0026] The material ratio of the expanded graphite and the elemental silicon powder in this embodiment is (0.01~0.2):1.

Embodiment 2

[0028] A carbon raw material for carbon composite refractories and a preparation method thereof. First, the elemental silicon powder is evenly filled at the bottom of the graphite crucible, and then the expanded graphite is evenly covered on the elemental silicon powder, and then kept at 1100~1200℃ for 1.5~2 hours in a nitrogen atmosphere, and the substance covered on the elemental silicon powder is taken out. , to obtain carbon raw materials for carbon composite refractories.

[0029] The material ratio of the expanded graphite and the elemental silicon powder in this embodiment is (0.2~0.4):1.

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Abstract

The invention relates to a carbon raw material for a carbon composite refractory material and a preparation method thereof. The technical scheme comprises the following steps: firstly uniformly filling the bottom of a graphite crucible with a monatomic silicon powder, uniformly coating the monatomic silicon powder with graphite, carrying out thermal insulation at 1000-1400 DEG C in the atmosphere of argon or nitrogen for 1-4 hours, and taking out a substance which covers the monatomic silicon powder so as to prepare the carbon raw material for the carbon composite refractory material, wherein graphite is one of expandable graphite and graphene, and mass ratio of graphite to the monatomic silicon powder is (0.01-0.9):1. By adjusting the mass ratio of graphite to the monatomic silicon powder, in-situ preparation of different numbers and sizes of silicon carbide whiskers is realized on the edge of graphite. The prepared carbon raw material for the carbon composite refractory material has excellent resistance to oxidation, good dispersibility and excellent mechanical properties, is used in a carbon composite refractory material, and can be used to raise overall performance of a carbon composite refractory material and especially enhance mechanical properties and oxidation resistance of the carbon composite refractory material.

Description

technical field [0001] The invention belongs to the technical field of carbon composite refractory materials, and mainly relates to a carbon raw material for carbon composite refractory materials and a preparation method thereof. technical background [0002] With the development of technologies such as continuous casting, external refining and converter blowing, traditional oxide refractory materials are difficult to meet the production needs of the iron and steel industry. Therefore, since the 1970s, people have introduced carbon raw materials into refractory materials, and added appropriate amounts of antioxidants and binders to form carbon composite refractory materials, which greatly increased the service life of materials. The carbon raw material of traditional carbon composite refractories is mainly flake graphite, the content is generally 7~18wt%, and some are even as high as 30wt%. Compared with the oxide components in carbon composite refractory materials, carbon ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 李亚伟王庆虎桑绍柏金胜利
Owner WUHAN UNIV OF SCI & TECH
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