Modified carbon raw material for carbon-containing refractory material and preparation method thereof

Abstract

The invention relates to a modified carbon raw material for a carbon-containing refractory material and a preparation method thereof. The preparation method comprises the following steps: adding 5-30 wt% of a mixture of simple substance silicon powder and silicon dioxide micropowder into flake graphite fine powder or nano carbon black or multiwall carbon nanotubes; evenly stirring to obtain mixedpowder; and then, treating the mixed powder in a carbon-buried atmosphere at 800-1400 DEG C for 1-3 hours, wherein the molar ratio of the simple substance silicon powder to the silicon dioxide micropowder is (0.5-3):1. The invention has simple technique, and ceramic coatings with different thicknesses can be formed on the surface of the carbon raw material by regulating the molar ratio of the simple substance silicon powder to the silicon dioxide micropowder and regulating the percentage of the simple substance silicon powder and silicon dioxide micropowder in the carbon raw material. The oxidation resistance of the modified carbon raw material is greatly enhanced; and when being added into the carbon-containing refractory material, the modified carbon raw material can enhance the oxidation resistance of the carbon-containing refractory material, and simultaneously, the ceramic coating on the surface prevents the modified carbon raw material from reacting with the antioxidant in the carbon-containing refractory material, thereby enhancing the comprehensive properties of the carbon-containing refractory material.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a modified carbon raw material for carbon-containing refractory materials and a preparation method thereof. Background technique [0002] Carbon raw materials have excellent properties such as non-wetability to steel slag, high thermal conductivity, low thermal expansion coefficient, high refractoriness, and no eutectic with refractory materials. They are widely used in carbon-containing refractory materials for the iron and steel industry to improve their performance. Thermal shock stability, resistance to slag attack and permeability. However, the biggest disadvantage of carbon materials is poor oxidation resistance. For example, there are many lattice defects on the surface of graphite, and these defects become active oxidation sites; nano-carbon black has a large specific surface area and oxidizes at a very low temperature; On the one hand, it has a ...

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Problems solved by technology

However, this crystalline nanocarbon must react with the antioxidants in the material at high temperatures, thereby reducing the effective performance of the material.